CN103024644B - Combined type speaker system with front and back precise annular tube composite channels and multiple channels in back direction - Google Patents

Abstract

The present invention discloses a multi-channel rearward and forward-facing precision annular tube composite channel combined loudspeaker system. The sound radiation environment is limited by installing a precision annular tube composite channel or channel group in the front and back of the middle and bass paper cone speakers at the same time. , affect the process of sound transmission and radiation and the output sound field, and improve the fidelity and radiation efficiency of the sound waves radiated front and rear of the speaker. The channel is composed of a ring-shaped tube sound variable device and a ring-shaped tube sound quality element. The total equivalent vibration mass of the speaker is increased due to the joint action of the sound variable device and the sound quality, which reduces the low-frequency resonance frequency of the speaker and further improves the low-frequency radiation. efficiency. The vibrating body of the loudspeaker surrounded by the composite channel or channel group of the precision annular tube is not directly disturbed by the outside air, can better maintain the surface load balance or front-to-back load balance, and can improve its dynamic response speed, etc.

Description

Rear direction is multi-channel front and rear precision ring tube composite channel combined speaker system

Technical field:

The invention discloses a multi-channel rear-direction precise annular tube compound-channel combined loudspeaker system, which belongs to the field of electroacoustic technology.

Background technique:

In daily life, people often use loudspeakers to reproduce sound. After the commonly used electric mid-bass paper cone speakers (including bass, mid-bass, mid-range speakers and full-band speakers, hereinafter also referred to as speakers) are completed, the resonance frequency ω ₀ of the resonance system of its low-frequency force is determined, ω ₀ determines the lower limit of the frequency of the sound reproduced by the speaker, and usually takes the speaker installed on the infinite baffle as a reference to illustrate the speaker frequency ω ₀ and other indicators. In this case, the loudspeaker placed on the infinite baffle directly radiates and transmits sound to the air in the front and back directions. .

Generally, it is not possible to use such a loudspeaker without using the baffle to reproduce the sound. In that case, the opposite-phase sound waves radiated from the front and rear directions of the loudspeaker vibrating body will be mixed in the air to cancel, and the sound reproduction ability of the loudspeaker will be lost. When in use, the loudspeaker cannot be installed on an infinite baffle for use. It is always together with the speaker, using the baffle of the speaker box to divide and limit the sound wave radiation from the front and rear of the speaker vibrating body. This is different from the speaker's reference use environment and will affect the performance of the speaker.

But when the speaker is installed on the speaker to form a speaker system, the sound energy carried by the radiated waves behind the speaker is surrounded by the box, and cannot be radiated from the box, so it cannot be directly used, and these sound waves will also be affected by the speaker box. The internal environment of the body is reflected back and forth on the vibrating body of the speaker, and the sound pressure of the reflected wave will interfere with the vibration of the vibrating body of the speaker, further affecting the ability and effect of the speaker to radiate sound, and these objects in the surrounding environment of the speaker are far away from other The closer it is, the greater the impact. The impact of the surrounding environment on the speaker radiation is reflected in the change of the total equivalent _MM and _CM values of the speaker, and also affects the low-frequency resonance frequency of the speaker. Therefore, the low-frequency range of the speaker playback sound in the speaker system is It is determined by two factors: the speaker and the speaker box. As far as the above formula is concerned, if the influence of the speaker box can make the total equivalent effect of the speaker C _M or the total equivalent mass M _M increase at this time, ω ₀ can be reduced, and the speaker can reproduce more bass.

But the reality is the opposite. Usually, when the loudspeaker is installed on a sound box with a common structure according to the traditional way of radiating sound from the front to the outside and the back to the box, it cannot effectively increase its total equivalent mass M _M , on the contrary, it will always make the back of the vibrating body vibrate simultaneously Mass and total equivalent potency are reduced along with C _M. It can be seen from the above formula that this will make the lowest frequency of the sound reproduced by the speaker system higher than the resonance frequency ω ₀ of a single speaker, causing the speaker to lose some ability to reproduce low-frequency sound.

The reason why the speaker’s total equivalent compliance C _M decreases under the above circumstances is that the air inside the speaker constitutes a sound compliance component. When the speaker’s vibrating body works at low frequencies, it acts like an elastic spring, giving the speaker’s vibrating body a An elastic support restricts the resonance of its vibrating body from the outside of the speaker, making it difficult for the speaker to vibrate at low frequency, and cannot push the air to radiate as much sound as before, so its low frequency resonance frequency increases. Generally, the smaller the volume of the speaker box, the greater the elasticity generated by the air in the box, and the smaller the compliance (its elastic coefficient is equal to the reciprocal of the compliance coefficient), and vice versa. The elastic effect of the sound compliance element of the box air is shown in the above calculation formula, that is, the sound compliance element at low frequencies is equivalently connected in parallel to the existing force compliance element of the speaker itself, which increases the "elasticity" of the speaker vibration body , which reduces the "compatibility" of the total equivalent force C _M of the vibrating body, resulting in an increase in its ω ₀ . This is the case in common speaker systems, such as airtight speakers, phase-inverted speakers, and other speakers. That is, the speaker system formed by combining the traditional speaker and its usage with the traditional speaker structure cannot reduce the low frequency resonant frequency of the finished speaker during use.

Therefore, traditionally, the most common way to allow speaker systems to reproduce high-fidelity, lower-frequency sound is to use large-diameter woofers. Large-diameter woofers have a larger cone area, which can push more air vibration radiation, and its vibrating body is also heavier, which increases the total equivalent mass _M of the speaker and reduces ω ₀ . This method of reducing the frequency of the speaker by increasing the mass of the speaker's vibrating body means that more expensive cone materials and a larger power amplifier are used to drive the speaker, and the speaker must also have a thicker voice coil to withstand the power of the amplifier. The loudspeaker also needs a larger magnet to generate a greater driving force to make it vibrate, so this method is expensive to produce and use, and more complicated to produce and debug. When using a large-diameter woofer to reproduce the midrange, the dynamic response will be slow due to the heavy vibrating body, which will affect the high-fidelity reproduction of the midrange. Large-diameter woofers and a mid-range speaker to reproduce bass and midrange, respectively, but this leads to higher cost and effort.

Moreover, usually when the ordinary mid-bass speaker is installed on the speaker box, in order to avoid the influence of the standing wave in the box on the speaker, the speaker is usually not installed in the middle of the baffle of the box. In this case, various frequencies in the box The interference imposed by the reflected wave on the back of the vibrating body is unbalanced, which also affects the load balance of the vibrating body, affects its flexible vibration, reduces the reaction speed, and the interference of the reflected wave on the vibrating body also causes vibration distortion.

The invention patent "A Loudspeaker System" (Patent No.: ZL02110023.3) provides that when the loudspeaker works at low frequencies, the sound quality in the sound transmission sleeve dedicated to the loudspeaker is used to increase the total equivalent mass _M of the loudspeaker, effectively reducing the low-frequency The technology of the low frequency force resonance frequency of the speaker.

"A Speaker System" is a speaker system formed by combining a mid-bass speaker and a dedicated radiation channel installed on the back of the speaker. The core work of "A Speaker System" is to install a transmission channel on the back of the speaker vibration The acoustic sleeve channel is used to radiate and transfer the sound from the back of the speaker. This channel is the only channel for the speaker to radiate sound from the back to the outside. The vibration radiation from the back of the speaker will pass through the air load between the sleeves to the outside of the channel . the

In "A Speaker System", the air in the annular space between the loudspeaker and the inner and outer casings constitutes a sound compliance component C _A . Air, which constitutes the sound mass element. That is to say, from a structural point of view, "A Loudspeaker System" is mainly a composite sound structure composed of a low-frequency working loudspeaker, a sound compliance component, and a sound quality component. When the loudspeaker works at low frequency, the sound quality of the sound quality element in the sound transmission sleeve will become a part of the vibration quality of the loudspeaker, and increase the total equivalent vibration mass _M of the loudspeaker system. According to the above formula of low-frequency resonant frequency ω ₀ of the loudspeaker, it can be known that this will reduce the low-frequency resonant frequency of the loudspeaker, so that the loudspeaker radiates lower low-frequency sound than the original one.

When "A Speaker System" is installed on the speaker box for use, since the back of the speaker vibrating body is surrounded by the sound transmission sleeve in a large area, this largely avoids the reflected sound waves of various frequencies in the box, including standing The wave directly acts on the vibrating body, which can improve the anti-interference ability of the speaker, and maintain the uniform balance of the speaker's backward sound load, which is conducive to improving the response speed of the vibrating body.

"A Loudspeaker System" uses the sound quality existing in the sound transmission sleeve channel when working at low frequencies to increase the total equivalent vibration mass _M of the loudspeaker and reduce the low-frequency resonant frequency of common finished mid-woofer speakers, which is of great practical significance. Compared with Compared with ordinary woofers, this approach not only saves a lot of precious materials, but also does not affect the working speed of the speaker in the mid-frequency range. Therefore, "A Loudspeaker System" is different from ordinary mid-bass speakers in both the method of realizing the bass technology and the construction of the speaker system, and it develops the technology of the mid-bass speaker.

However, through further research, it is found that there are still some problems in the structure of "A Loudspeaker System", which affects the performance and ability of this system, and it is necessary to improve and perfect it in order to further improve the performance and functions of the system .

The structure, principle and performance of "A Speaker System" mainly have the following problems:

1. The channel space from the loudspeaker vibrator to the entrance of the sound transmission sleeve constitutes a sound compliance component _CA , _which includes the uneven path in the space from the root connection of the speaker basin to the magnet behind it . The uneven surface of this exposed speaker will block the sound waves radiated by vibration and cause reflection, resulting in distortion and sound energy loss during sound wave transmission.

The inner surface of the support surface of the basin around the sound wave radiation port of the loudspeaker blocks and reflects the passage of the sound wave radiated by the vibrating body to radiate uniformly backward, and prevents the distortion and deformation of the sound wave wave radiated through the radiation port on the basin frame, resulting in radiation The loss of sound energy, the reflection causes the speaker cone to vibrate and distort.

When the sound wave passes through the sound transmission channel, due to the narrow passage of the entire sound transmission sleeve, the sound pressure of the sound wave radiated by the vibrating body of the paper cone is attenuated slightly along the channel, and there are high sound pressures around the speaker cone and in the passage of the sound transmission sleeve , the above-mentioned distorted sound pressure of reflection and radiation will immediately produce high-intensity reflection at close range, which will interfere with the vibration of the vibrating body and cause the vibration distortion of the vibrating body.

That is to say, there are three kinds of distortions in the whole channel of the sound transmission sleeve: the vibration distortion of the vibrating body, the radiated sound wave distortion of the radiation port, and the channel transmission sound wave distortion.

2. At the entrance of the corresponding space of the C _A component, the area of the path through which the air flows has changed, that is, in this speaker system, in the front space from the speaker to the space where the sound quality element in the sound transmission sleeve is located, the implied with an acoustic transducer. However, because there is a connection gap between the speaker frame, the upper magnetic guide plate and the magnet in the channel, and the upper end surface of the upper magnetic guide plate and the magnet has a reflective surface facing the vibrating body, this is formed by means of these exposed parts of the speaker. The channel is not smooth, and the sound waves are reflected here and cause distortion and sound energy loss. Due to the uncertainty of these distortions and sound energy loss, the accuracy of the transformation effect that the acoustic transducer implied by _CA is affected.

3. The existing problems of the acoustic compliance component C _A cause distortion and affect the radiation efficiency. It does not help to reduce the resonant frequency of the loudspeaker, and it also makes the equivalent circuit complicated, which is not conducive to the simplification and intuitive analysis of the problem.

4. In "A Loudspeaker System", a method of sound mass elements with equal cross-sectional areas composed of two straight circular tubes is simply given, but in essence, the transmission between two frustum-shaped tubes that are socketed together The cross-sectional area of the sound channel and the sound transmission channel formed between the two circular plates along the channel direction is not equal. In order to meet the sound quality requirements of the sound transmission casing, the sound quality element needs to be reconfigured between them. Therefore, it is necessary to fully improve the construction method of the sound quality element in the sound transmission channel formed between the frustum-shaped tubes and between two circular plates.

It can be seen that in order to further improve the performance in "A Speaker System", the above-mentioned problems must be solved. That is, in order to reduce the reflection and radiation distortion caused by the blocking around the radiation port of the speaker frame, as well as the resulting energy loss, the structure of the speaker frame should be improved; in order to reduce the vibration distortion caused by the internal reflection of the channel and the transmission distortion of the channel, it is necessary Modified sound radiation channel. The aforementioned distortion and loss of sound energy affect the quality and ability to reproduce the sound. The above questions 1, 2, and 3 are all related to the space where the acoustic compliance component _CA in the sound transmission sleeve is located, and the hidden acoustic variable element in _CA is also related to the spatial structure of the radiating sound transmission channel. It is necessary to redesign the sound compliance component C _A space in the sound transmission sleeve channel of "A Speaker System", and strictly construct this hidden acoustic variable element, and at the same time, it is necessary to improve the construction method of the sound quality component in the channel.

Contents of the invention

The technical problem to be solved by the present invention is to provide a multi-channel backward and forward precision annular tube composite channel combined speaker system, which solves the problem of wide and unevenly distributed support surfaces between the radiation ports of the speaker back to the basin frame, Reflecting the sound waves radiated backwards by the vibrating body of the paper cone interferes with the vibration of the paper cone, and the wide and unevenly distributed support surface between the radiation ports of the basin frame blocks the passage of the sound wave radiated by the vibrating body of the paper cone evenly radiating backwards, resulting in Radiated sound waves are severely distorted, which affects the efficiency of medium and low frequency radiation; it also solves the transmission distortion caused by the reflective surface in the space where the acoustic compliance component C _A is located during the sound wave transmission process, and the vibration distortion of the paper cone caused by the sound wave reflection here and the vibration distortion in C _A Acoustic energy loss, and by solving the distortion and acoustic energy loss and its uncertainty in _CA , improve the accuracy of the transformation effect of the hidden acoustic variable in _CA ; also solve when the inner and outer casings are not straight pipes, in The formation problem of the sound quality element in the annular pipe channel formed between the inner and outer pipes; By using this sound quality element, the equivalent vibration mass of the speaker can be increased, and the low-frequency resonant frequency ω ₀ of the speaker can be reduced. Especially in the multi-channel backward and forward precision ring tube composite channel combination speaker system, its ability to reduce the low frequency resonance frequency of the speaker is more obvious, the method is more flexible, and the load at both ends of the speaker is easier to balance in this way , is conducive to improving the vibration response speed, and the vibration distortion is also smaller; the precision ring tube composite channel group installed front and rear upward can improve the midrange of the speaker; the precision ring tube composite channel or channel group installed in front of the speaker to radiate sound externally, It can also expand the sound field of the loudspeaker to reproduce the sound, and improve the directivity and front cavity effect of the radiated sound of the loudspeaker system. The damping of the loudspeaker system can also be adjusted by adding damping material within the annular tube channel or group of channels. To overcome the defects of the prior art.

The technical solution adopted by the present invention to solve its technical problems is as follows:

The rear direction is a multi-channel front and rear precision annular tube composite channel combined speaker system, including a paper cone speaker. The paper cone speaker includes a pot frame with a radiation port and a vibrating paper cone connected to the pot frame. The pot frame and The vibrating paper cone is coaxial; the rear end of the pot frame is equipped with a circular magnet, and the pot frame is coaxial with the circular magnet; it also includes a second The inner sleeve also includes an outer sleeve coaxial with the second inner sleeve, the front port of the outer sleeve is airtightly installed on the basin frame, and the radiation port of the basin frame is located inside the outer sleeve; the outer wall of the second inner sleeve and the outer sleeve A rearward annular pipe passage is formed between the inner walls of the pot frame; it is characterized in that: the front end of the side wall of the pot frame of the pot frame has an outer flange; and the rear end is installed on the outer flange and is coaxial with the vibrating paper cone The front outer sleeve is provided with a front inner sleeve coaxial with the front outer sleeve inside the front outer sleeve; the front inner sleeve and the front outer sleeve are fixedly connected to each other; the outer wall of the front inner sleeve is connected to the front outer sleeve A forward and forward annular pipe channel is formed between the inner walls of the

At least one rearward intermediate sleeve is arranged between the outer sleeve and the second inner sleeve, and the rearward intermediate sleeve is coaxial with the circular magnet; the front end of the rearward intermediate sleeve is as close as possible to the position corresponding to the rear of the vibrating paper cone at the maximum amplitude; the rearward intermediate sleeve is connected to the outer sleeve and the second inner sleeve; at least two rearward annular tube channel units are formed between the rearward intermediate sleeve, the outer sleeve and the second inner sleeve.

It also includes a section of the first inner casing in the form of a circular table with the axis O of the paper cone of the vibrating body as the central axis. The front port of the first inner casing is airtightly connected between the root of the rear end of the basin frame and the rear edge of the radiation port of the basin frame. The rear end of the first inner sleeve is aligned with the front end of the second inner sleeve, and a smooth frustum-shaped transition surface is formed between the front end of the first inner sleeve and the second inner sleeve; the first inner sleeve is connected to the second inner sleeve. There is a smooth transition between the two inner sleeves.

There are several groups of rearward barriers that are consistent with the direction of the rearward circular pipe channel unit installed in the rearward annular pipe channel unit. The interior of the rearward barriers is a solid body or a closed body, and the space between adjacent backward barriers is Sound transmission channels, each sound transmission channel has a uniform cross-sectional area along its sound transmission direction.

There are several groups of forward barriers installed in the forward circular tube channel, which are in the same direction as the forward circular tube channel. The inside of the forward barrier is a solid body or a closed body, and the sound transmission is between adjacent forward barriers. Each sound transmission channel has a uniform cross-sectional area along its sound transmission direction.

It also includes at least one forward intermediate sleeve located between the front outer sleeve and the front inner sleeve, the forward intermediate sleeve is coaxial with the vibrating paper cone; the rear end of the forward intermediate sleeve is as close as possible to the vibrating paper The maximum amplitude of the forward corresponding position of the basin; the forward middle casing, the front outer casing and the front inner casing are fixedly connected to each other; at least two front middle casings, the front outer casing and the front inner casing are formed A forward annular tube channel unit.

There are several groups of forward barriers that are consistent with the direction of the forward annular tube channel unit installed in the forward annular tube channel unit. The inside of the forward barrier is a solid body or a closed body, and the space between adjacent forward barriers is Sound transmission channels, each sound transmission channel has a uniform cross-sectional area along its sound transmission direction.

It also includes a partition with the axis O of the vibrating paper cone as the central axis. The rear end of the partition is located in front of the maximum amplitude of the vibrating paper cone and is as close as possible to the maximum amplitude; the front end of the partition is in contact with the front inner sleeve The rear ends of the tubes are aligned and connected, and the outer wall of the barrier is a smooth surface; the transition between the barrier and the front inner casing is smooth.

The positive effects of the present invention are:

The multi-channel backward and forward precision ring tube compound channel combined speaker system is formed on the basis of the precision ring tube compound channel speaker system. The precision ring tube compound channel speaker system is a medium and low frequency speaker installed in The rearward precision annular pipe composite channel is combined to form. The sound waves radiated from the back of the speaker cone vibrating body in the precision ring tube composite channel speaker system are radiated through the openings between the pot frames. Compared with the radiation ports of ordinary pot frames, these speaker pot frames have larger and more uniform radiation Opening, which greatly reduces the blocking of the sound wave radiated by the cone vibrating body by the speaker pot frame, improves the fidelity of the sound wave radiated by the speaker, and is conducive to improving the radiation efficiency of the speaker in the middle and low frequencies. The precision annular tube composite channel is formed by an annular space and an annular tube channel. At low frequencies, if the channel area of the annular tube channel of the precision annular tube composite channel is constant, the annular space of the precision annular tube composite channel is an annular tube sound Transducer Element, The Ring Tube Channel of the Precision Ring Tube Composite Channel is a ring tube acoustic variable variable element, the Precision Ring Tube Composite Channel can be mounted on the front of the loudspeaker as a forward facing Precision Ring Tube Composite Channel, or installed in the speaker's Rear upward, forming a backward precision annular tube composite channel, it can also be installed on the front and back of the speaker, forming a front and rear precision annular tube composite channel for use.

An intermediate sleeve is added in the middle of the precision annular tube composite channel, and a precision annular tube composite is formed between adjacent intermediate sleeves, between the intermediate sleeve and the adjacent inner sleeve, and between the intermediate sleeve and the adjacent outer sleeve. The channel group, wherein each annular space unit space divides the annular space formed between the inner and outer casings in the precision annular tube compound channel, and each annular tube channel unit space divides the annular space formed between the inner and outer tubes in the precision annular tube compound channel The annular space unit of the same group is connected with the annular pipe channel unit to form a precision annular tube composite channel, or in other words, the precision annular tube composite channel group is formed by a group of precision annular tube composite channels socketed together. The working process of the pipe compound passage group is exactly the working process of a group of precision annular pipe compound passages. The precision ring tube compound channel group can be installed on the front of the speaker as a forward precision ring tube compound channel group, or installed at the back of the speaker to form a rearward precision ring tube compound channel group, and can also be installed at the front and back of the speaker Upward, it is used to form a composite channel group of front and rear precision annular tubes. In the present invention, the composite channel group of precision annular tubes can be installed on the front and back of the loudspeaker to form a composite channel group of precise annular tubes facing forward and backward. Various combinations of different precision annular tube composite channels or groups of precision annular tube composite channels facing forward and backward constitute a front and rear precision annular tube composite channel combined loudspeaker system with multiple channels in the rear direction.

Since the precision annular tube compound channel group is a group of precision annular tube compound channels, it is more flexible and has more functions than the precision annular tube compound channel. If in the composite channel group of precision annular tubes, each channel composed of the acoustic transducer element and the acoustic transducer element, when the transformation ratio of the acoustic transducer of some channels is 1, that is, the inlet and outlet areas of these channels are constant At this time, these channels are only channels composed of acoustic transducer elements. At this time, if these channels are in the same direction as the vibration body radiating sound waves, then these channels pass through some sound waves that are consistent with the vibration body radiating sound wave waveforms, similar to sound waves. What passes through the tube is a plane wave, which increases the radiation efficiency of the speaker accordingly.

Because the working principle of each compound channel in the precision ring tube compound channel group is the working principle of the precision ring tube compound channel, and in the precision ring tube compound channel or channel group combined speaker system, the sound wave is compounded in the forward precision ring tube The working principle of the radiation transfer in the channel is the same as that of the sound wave in the backward precision annular tube composite channel, so sometimes the backward precision annular tube composite channel is used as an example to illustrate the working situation.

1. Renovate the structure of the pot frame that affects the sound radiation of the speaker, reduce the reflection of the inner surface area of the pot frame on the vibration radiation of the paper cone and the resulting vibration distortion of the paper cone, and reduce the radiation distortion caused by the deformation of the sound wave passing through the radiation port. Improves the fidelity and radiation efficiency of loudspeaker and radiated sound.

The loudspeaker in the precision annular tube composite channel speaker system can be a mid-bass speaker with an improved speaker basin structure, or an ordinary mid-bass speaker. Usually, a precise sound transfer channel is able to transfer sound waves with precision. However, when the ordinary mid-bass speaker constitutes a precision annular tube composite channel speaker system, the sound waves radiated from the back of the speaker cone vibrating body will enter the sound transmission channel through the radiation port on the side support surface of the speaker basin frame, and the basin frame support surface The inner surface of the paper cone will block the reflection of the radiation wave, and because the position is very close to the vibrating body, the reflected wave will immediately interfere with the normal vibration of the vibrating body, causing vibration distortion, and the sound waves radiated uniformly from the paper cone to the surrounding are due to the support surface of the basin frame. Blocked, the sound wave waveform after coming out of the radiation port has been seriously deformed. Therefore, when it is necessary to further improve the performance of "A Loudspeaker System" to radiate and transmit sound, it is necessary to make necessary improvements to the wide and unevenly distributed support surface of the loudspeaker frame, which is also conducive to improving the loudspeaker when it works at medium and low frequencies. Sound Radiation Efficiency. the

There are three main schemes:

(1) There are several supporting ribs connected between the bottom surface of the basin frame and the straight side wall, and there are radiation openings between adjacent supporting ribs.

(2) A pot frame structure with multiple large strip-shaped radiation openings and thin support surfaces or narrow and thick support ribs.

(3) The basin frame structure adopts large mesh radiation opening and fine mesh side support surface or narrow and thick support ribs.

Scheme (1) The side wall of the basin frame can be fitted and installed on the inner wall of the outer sleeve (3). There are several narrow and thick support ribs connected between the bottom surface of the basin frame and the straight side wall, and the adjacent support ribs are radiation openings.

The pot frame structure of these speakers has significantly reduced pot frame support surface, and the distribution of pot frame radiation ports is more uniform. The support surface is significantly reduced, which can reduce the blocking and reflection of the pot frame to the sound wave radiated by the vibrating body paper cone, which reduces the distortion caused by the reflection interfering with the vibration of the paper cone; the distribution of the radiation ports of the pot frame is more uniform, reducing the sound waves passing through the pot frame The deformation at the radiation port facilitates the high-fidelity passage of the sound wave waveform in the channel, which can improve the radiation efficiency of the vibrating body cone.

When the above-mentioned types of mid-bass speakers are combined with the precision annular tube composite channel to form a rear-facing precision annular tube composite channel speaker system, this structure greatly reduces the blocking and reflection of radiated sound waves, and reduces the reflection and blocking of the basin frame. The distortion and loss of sound energy are also conducive to the speaker system to produce larger and more fidelity mid- and low-frequency sounds. The connection strength at the radiating opening of the frame of the above-mentioned speakers can also be connected through the compound channel of the precision ring tube, and through the outer tube of the channel, and then connected to the outer flange of the speaker frame.

The radiation port of the basin frame is more evenly distributed and the loudspeaker with an enlarged radiation port outlet area makes the radiated sound wave waveform more fidelity, which lays a solid foundation for improving the radiation efficiency. Maintaining a consistent wave vibration surface can improve the radiation efficiency of the mid-frequency of the speaker system. This method also makes the surface load of the vibrating paper cone uniform, which is beneficial to reduce vibration distortion, and the vibration is more powerful at low frequencies, more like a precise rigid piston, and has better bass performance.

With this kind of speaker, the rear direction is multi-channel and the front and rear precision annular tube composite channel combined speaker system is easier to balance the load at both ends of the speaker, which is beneficial to improve the vibration response speed, the vibration distortion is also smaller, and the sound is more fidelity .

2. Construct a precision annular tube acoustic variable element, which improves the environment in the channel, greatly reduces the distortion and sound energy loss caused by the blocking and reflection of sound waves in this section of the channel, and thus simplifies the analog circuit of the system.

There are two sound energy losses in the channel of "A Speaker System", one is in the channel space, which is caused by the reflection of sound waves caused by the obstruction of objects; the other is on the channel wall, which is caused by the friction between the air and the channel wall. The acoustic compliance component C _A formed by the space defined by the outer sleeve from the back of the speaker basin to the front of the speaker magnet in the channel is a two-port component, and usually the areas of its input port and output port are different. In this sense Look, the _CA space is the same as the component space of an acoustic transducer, that is, there is an acoustic transducer implied in _CA.

However, in the space where C _A is located, there are some uneven surfaces such as the connection between the magnet and the root of the speaker basin. When the sound wave passes through this area, reflections will occur in these places, consuming sound energy, and due to the narrow space of C _A , the reflection will form a strong interference to the vibrating body, affecting the vibration of the speaker, causing the vibration of the vibrating body's cone vibration and the distortion of the radiation transfer process and the loss of sound energy. In this respect, _CA is different from the acoustic transducer. And because C _A does not have any positive significance to reduce the frequency of "a speaker system", in the equivalent circuit, it also makes the circuit complicated and not easy to analyze. The uneven surface in the space where the acoustic compliance component C _A is located in the sound transmission sleeve channel blocks and reflects the transmitted sound waves, which directly affects the efficiency of mid- and low-frequency radiation and the fidelity of sound, and the amplitude-frequency characteristics of mid-frequency become uneven.

Therefore, in the composite channel combined loudspeaker system with multi-channel front and rear precision ring tubes, by adding the first inner sleeve, a smooth annular space is constructed between the first inner sleeve and the outer sleeve to form an annular tube. Acoustic Variable Converter replaces the sound compliance component C _A in "A Kind of Speaker System". Compared with the sound transmission sleeve channel in "A Kind of Speaker System", due to the internal brilliance of the precision ring tube composite channel, there is no distortion caused by the reflective surface and energy loss, which can greatly improve the amplitude-frequency characteristics of the mid-low frequency output by the speaker system, making the amplitude-frequency characteristics smoother. The larger radiation opening in the multi-channel front and rear precision ring tube composite channel combined speaker system fundamentally ensures that the air in the precision ring tube channel is incompressible, and the volume velocity does not change, so it can be ignored under certain conditions Compliance value of the annular space. In this way, the influence of the sound compliance component C _A in "A Speaker System" is completely eliminated in the analog circuit diagram, and the analog circuit becomes more concise and clear. The internal structure of the compound channel of the precision annular tube is regular, and the main parameters can be designed very precisely, which is conducive to industrial standardized production.

The usual acoustic transducer is formed in a hollow tube with different inlet and outlet areas. The acoustic transducer in the complex channel of the precision annular tube in the present invention is formed by an annular space between two pipes, which is different from the general construction method.

3. Improve the formation method of the sound quality components of several other main structures in the sound transmission sleeve channel in "A Kind of Loudspeaker System". The structure of the precision annular tube composite channel loudspeaker system has many changes, and its usage is more flexible.

In "A Loudspeaker System", when the shape of the sound tube constituting the sound transmission channel is an outwardly expanding conical shape, the annular area along the direction of the channel will change, and the sound quality element between the inner and outer tubes will no longer exist . In order to make the sound mass element still exist in the annular pipe channel at this time, it is necessary to reconstruct a space with the same cross-sectional area inside the channel along the direction of the channel as the sound mass element.

Still take the composite channel of the backward precision annular pipe as an example. At this time, the basic composition of the annular tube sound quality element in the multi-channel front and rear precision annular tube composite channel combined speaker system is to form a section with uniform cross-sectional area and the same cross-sectional area between the second inner sleeve and the outer sleeve. Straight circular air channel. For other needs, it can also be an annular pipe channel in the shape of a truncated cone, but the cross-sectional area of this structural space varies from place to place, so it cannot directly form an acoustic mass element. Therefore, in the precision annular tube composite channel loudspeaker system, it is further expanded and perfected when the channel is a conical annular tube channel, and even the platform of the conical annular tube channel is further expanded so that the inner and outer tube walls of the channel are expanded to a plane position, When it becomes two flat circular plates inside and outside, that is, when the channel of the truncated circular tube becomes the channel between the two flat circular plates, the formation mode of the sound mass element between the channels. The above-mentioned changes ensure that the shape and application of the composite channel of the precision annular tube are more flexible and diverse.

For this reason, the present invention is a multi-channel forward and backward precision annular tube composite channel combined loudspeaker system. The barrier is a solid body or a closed body, which forms a new sound transmission channel between two adjacent groups of rearward barriers, and makes each sound transmission channel have a consistent cross-sectional area along its direction, even if the conical sound tube There are different outward expansion angles, and in the annular space formed between the two tubes, sound quality elements can be constructed simply and flexibly to meet the requirements of frequency reduction. Since the shape of the precision annular tube compound channel group depends on the shape of each precision annular tube compound channel, the sound mass element of each channel unit in the precision ring tube compound channel group is determined by the sound quality structure of each precision ring tube compound channel.

Likewise, when the frusto-conical annular tube channel becomes a channel between two planar discs, the acoustic mass element can also be reconstructed in this way between the two discs.

After taking these measures, the other main components of the sound quality components in the channel have been expanded and improved, fundamentally ensuring that there are always sound quality components in the channel, which ensures the reduction of the force of the loudspeaker system with the precision annular tube compound channel structure. The effect of resonant frequency, and make the selection of channel shape more flexible and free, so that its structure has wider adaptability.

In particular, the front and rear precision annular tube composite channel combined loudspeaker system with multi-channel in the rear direction can simultaneously utilize the sound quality in the annular tube channels or channel groups in the front and rear directions to maximize the equivalent effect of the sound quality components The resonant mass on the speaker further reduces the low frequency resonant frequency of the speaker.

4. There is a forward-facing precision annular tube compound channel group and a rearward-facing precision annular tube compound channel combined speaker system with multiple channels, which further expands the system's functions

As we all know, when sound passes through a thin sound tube, the sound wave in the thin sound tube can be regarded as a plane wave. An intermediate sleeve is added between the inner and outer sleeves to form a complex channel group of precision annular tubes, the annular tube channel units formed between adjacent intermediate sleeves and between the outer sleeve and adjacent intermediate sleeves, or even any group of annular tubes The cross-sectional area of the tube channel unit becomes smaller, and when the sound wave radiated by the loudspeaker passes through these narrower annular tube channel units, the sound waves in these precision annular tube composite channel units can be regarded as plane waves.

When the rear end of the ring-shaped middle channel unit in the precision ring tube composite channel group that radiates sound in front of the speaker is installed, it is as close as possible to the corresponding position on the surface of the vibration body when the amplitude of the speaker’s vibration body is the largest, then the circular vibration body of the speaker radiates Sound waves radiate outward through each forward channel unit, and the directional sound waves radiated from the surface of the circular vibrating body are maintained by these narrow forward channel units, controlling the total annular area of each forward channel unit and the loudspeaker The equivalent vibration area in a certain frequency range is equal, and the front and rear areas of each precision annular tube composite channel unit are kept unchanged, and each precision annular tube composite channel unit is as consistent as possible with the path of the radiated sound wave, then each precision annular tube The vibration surface of the sound wave radiated by the vibrating body passing through the composite channel unit is basically unchanged, similar to the plane wave passing through the hollow tube, which can especially improve the mid-frequency radiation efficiency of the loudspeaker.

The precision annular tube composite channel group installed in front of the speaker to radiate sound to the outside can also expand the sound field of the speaker to reproduce the sound, and improve the directivity and front cavity effect of the radiated sound of the speaker system.

Usually, the sound radiated by the loudspeaker is directional, which is the so-called directivity of the loudspeaker, which is determined by the design principle, structure and characteristics of the loudspeaker itself. In the forward-facing precision annular tube composite channel group speaker system, the sound radiated from the vibrating surface of the speaker is radiated through each annular nozzle. Therefore, by adjusting the diameter and direction of the outlet in the annular tube radiation channel, the paper cone can be changed. The direction in which the speaker radiates sound affects its directivity and adjusts the width of the sound field of its radiated sound waves.

The front chamber effect usually occurs in a short range in front of the cone basin on the front of the mid-low frequency speaker. The precision ring tube composite channel or the conical partition in the channel group installed in the front of the speaker radiates sound, which divides and blocks the speaker cone. The medium and low frequency sound waves radiated from all over the surface of the paper cone form a way of interference in the front cavity, thus greatly improving the effect of the front cavity. the

5. A front and rear precision circular tube compound channel combined speaker system with multiple channels can be directly used as a simple speaker without a box. It is assumed that the rear annular space of the precision annular tube compound channel combined speaker system is enlarged, and the rear direction is multi-channel. The forward-facing precision annular tube composite channel or channel group is used to improve the efficiency of mid-frequency radiation, and the rear-facing precision annular tube composite channel or channel group is used to improve the efficiency of low-frequency radiation. It is a simple and more efficient mid- and low-frequency speaker system.

6. Add damping material in the annular pipe channel or at the outlet of the channel to flexibly adjust the damping of the front and rear precision annular tube composite channel combined speaker system with multiple channels in the rear direction.

The damping in "A Speaker System" depends on three main aspects: the damping of the speaker, the influence of the sound channel and the air in the box. It is not very convenient to adjust, which limits the selection of the speaker. In order to make more flexible use of existing loudspeakers with high and low damping values, the present invention can add damping material in the annular tube channel or its outlet end, or in some annular tube channel units or its outlet end, so as to adjust the damping of the system when necessary.

Description of drawings:

Fig. 1 is a composite loudspeaker system with multi-channel rearward direction precision annular tube compound channel group + forward precision annular tube compound channel.

Fig. 2 is a composite loudspeaker system with multi-channels in the rear direction of the composite channel group of the rear-facing precision annular tube + the composite channel group of the forward-facing precision annular tube.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific examples.

As shown in Figure 1, the present invention comprises paper cone loudspeaker 1, and described paper cone loudspeaker 1 comprises the basin frame 1-1 that has radiation port and the vibrating paper cone 1-2 that is connected with basin frame 1-1, and basin frame 1-1 is coaxial with the vibrating paper cone 1-2; the rear end of the pot frame 1-1 is equipped with a circular magnet 1-3, and the pot frame 1-1 is coaxial with the circular magnet 1-3; it also includes the front end Installed on the outer circumference of the circular magnet 1-3 and coaxial with the second inner casing 2 of the circular magnet 1-3, also includes an outer casing 3 coaxial with the second inner casing 2, the outer casing 3 The front port is sealed and installed on the basin frame 1-1, and the radiation port of the basin frame is located inside the outer casing 3; an annular tube channel 4 is formed between the outer wall of the second inner casing 2 and the inner wall of the outer casing 3; it is characterized in that: The front end of the pot frame side wall of the pot frame 1-1 has an outer flange; it also includes a front outer sleeve 7 whose rear end is installed on the outer flange and is coaxial with the vibrating paper cone 1-2. The inside of the outer sleeve 7 is provided with a front inner sleeve 8 coaxial with the front outer sleeve 7; the front inner sleeve 8 and the front outer sleeve 7 are fixedly connected to each other; A forward annular pipe channel 6 is formed between them.

At least one rearward intermediate sleeve 12 is arranged between the outer sleeve 3 and the second inner sleeve 2, and the rearward intermediate sleeve 12 is coaxial with the circular magnet 1-3; the front end of the rearward intermediate sleeve 12 is as close as possible The maximum amplitude of the position corresponding to the backward direction of the vibrating paper cone 1-2; the rearward middle casing 12 is connected to the outer casing 3 and the second inner casing 2; the rearward middle casing 12, the outer casing 3 and the second inner casing At least two backward annular pipe channel units 4-1 are formed between the sleeves 2.

The intersecting line between the section passing through the axis O and the outer wall on one side of the second inner casing 2 is L1, and the intersecting line between the section and the inner wall of the outer casing 3 on the same side as L1 is L2; Intersecting lines on the same side as L1 between the inner wall and the outer wall of the rearward intermediate sleeve 12 are respectively L5 and L6; L1, L2, L5, and L6 may be parallel to each other.

It also includes a section of conical first inner casing 5 with the axis O of the vibrating body paper cone 1-2 as the central axis. Between the rear edge of the radiation opening of the rack, the rear end of the first inner sleeve 5 is aligned with the front end of the second inner sleeve 2, and a smooth gap is formed between the front end of the first inner sleeve 5 and the second inner sleeve 2. Conical transition surface; smooth transition between the first inner sleeve 5 and the second inner sleeve 2 . The first inner sleeve 5 can also be smoothed to the corresponding position with paste, and then formed after solidification.

There are several groups of rearward blocking members whose direction is consistent with the backward annular pipe channel unit 4-1. The rearward blocking members are solid bodies or closed bodies, adjacent to the rear. There are sound transmission channels between the direction blocking members, and each sound transmission channel has a consistent cross-sectional area along its sound transmission direction.

There is an annular space 10 between the rearward middle sleeve 12 of the outer periphery of the first inner sleeve 5, the second inner sleeve 2 and the outer sleeve 3; the length of the annular space 10 and the backward annular pipe channel unit 4-1 is equal Less than or equal to 1/10 of the wavelength of the low-frequency resonance sound wave of the speaker system.

The angle α between L1, L2, L5, L6 and the axis O is 90°, and the first inner sleeve 5, the rearward middle sleeve 12, the second inner sleeve 2 and the outer sleeve 3 are all annular flat plates.

The ratio of the total area of the radiation openings to the total area of the side walls of the frame 1-1 should be as large as possible under the premise of ensuring the structural strength, such as not less than 80%.

The form of the basin frame 1-1 can also be: its side wall is attached and installed on the inner wall of the outer sleeve 3, and several support ribs are connected between the chassis and the side wall of the basin frame 1-1, and the adjacent support ribs Between is the radiation port.

It also includes a partition 9 with the axis O of the vibrating paper cone 1-2 as the central axis, the rear end of the partition 9 is located in front of the maximum amplitude of the vibration paper cone 1-2 and is as close as possible to the maximum amplitude; The front end of the stopper 9 is aligned with the rear end of the front inner sleeve 8, and the outer wall of the stopper 9 is a smooth surface; the transition between the stopper 9 and the front inner sleeve 8 is smooth.

The intersection line between the section passing through the axis O and the outer wall on one side of the front inner casing 8 is L3, and the intersection line between the section and the inner wall of the front outer casing 7 on the same side as L3 is L4, L3 and L4 can be parallel to each other.

The included angle between L3, L4 and the axis O is α, and the angle range of α is 0°≤α≤90°. When α1<α≤90°, the direction and the annular pipe passage 6 are installed in the annular pipe passage 6 There are several groups of consistent forward blocking parts. The inside of the forward blocking parts is a solid body or a closed body. There are sound transmission channels between adjacent forward blocking parts. Each sound transmission channel has a consistent transverse direction along its sound transmission direction. cross-sectional area.

The determination method of α1 is as follows: when α<α1, the front and rear cross-sectional areas of the annular tube channel 6 are basically the same, and the annular tube channel 6 can basically serve as the sound mass element.

When α=90°, the front inner casing 8 and the front outer casing 7 are annular flat plates.

There is an annular space 11 between the outer casing 7 and the barrier 9; the lengths of the annular pipe passage 6 and the annular space 11 are both less than or equal to 1/10 of the wavelength of the low-frequency resonance sound wave of the speaker system passing through the pipe passage .

There is an annular space 11 between the front outer sleeve 7 and the barrier 9, and the annular space 11 and the annular tube channel 6 together form a forward precision annular tube composite channel for radiating and transmitting the forward sound waves of the loudspeaker.

A damping layer may be installed at the outlet of the annular pipe channel 6 .

As shown in Figure 2, it also includes at least one forward intermediate sleeve 14 between the front outer sleeve 7 and the front inner sleeve 8, the forward intermediate sleeve 14 is coaxial with the vibrating paper cone 1-2; The rear end of the forward intermediate sleeve 14 is as close as possible to the maximum amplitude of the forward corresponding position of the vibrating paper cone 1-2; the forward intermediate sleeve 14, the front outer sleeve 8 and the front inner sleeve 7 are fixedly connected to each other ; At least two forward annular tube channel units 6-1 are formed between the forward middle sleeve 14, the front outer sleeve 8 and the front inner sleeve 7.

The intersecting line between the section through the axis O and the outer wall on one side of the front inner casing 8 is L3, and the intersection line between the section and the inner wall of the front outer casing 7 on the same side as L3 is L4; The intersecting lines on the same side as L3 between the inner wall and the outer wall of the forward intermediate casing 14 are respectively L7 and L8; L3, L4, L7, and L8 can be parallel to each other.

The included angle between L3, L4, L7 and the axis O is β, and the angle range of β is 0°≤β≤90°. When β1<β≤90°, it is installed in the forward annular pipe channel unit 6-1 There are several groups of forward barriers with the same direction as the forward annular pipe channel unit 6-1. The inside of the forward barriers is a solid body or a closed body, and there are sound transmission channels between adjacent forward barriers. Each The sound transmission channel has a uniform cross-sectional area along its sound transmission direction.

The determination method of β1 is as follows: when β<β1, the front and rear cross-sectional areas of the forward annular tube channel unit 6-1 are basically the same, and the forward annular tube channel unit 6-1 can basically serve as the sound quality element.

An annular space 11 is formed between the forward middle casing 14, the front inner casing 8, and the front outer casing 7 on the outer periphery of the barrier member 9; the lengths of the annular space 11 and the forward annular pipe passage unit 6-1 are all less than or equal to 1/10 of the wavelength of the low-frequency resonance sound wave of the speaker system.

The included angle between L3, L4, L7, L8 and the axis O is β=90°, and the forward middle sleeve 14, the front inner sleeve 8 and the outer sleeve 7 are annular flat plates.

Relevant calculations for the multi-channel front and rear precision ring tube composite channel combined speaker system:

Take the compound channel loudspeaker system of precision circular tube as an example. In the multi-channel front and rear precision ring tube composite channel combined speaker system, the sound waves radiated from the back of the speaker vibrating body are output through the ring radiation opening on the speaker frame, enter the rear ring space and pass through the rear ring tube. The outlet end of the channel is output to the outside of the channel, so the air in the channel becomes a part of the speaker, and at any moment, the air in the channel becomes the most direct load of the vibrating body. Due to the narrow and short composite channel of the backward precision annular tube, when the speaker works at low frequency, the sound pressure generated by the vibrating body can be maintained in the channel where the sound quality element is located for a period of time, so the sound pressure in the channel rises, and the air in the channel at this time The reaction of the load to the loudspeaker vibrating body is strengthened, and the rear-facing precision ring tube composite channel loudspeaker system produces more powerful sound radiation.

The precision annular tube composite channel is composed of some short tubes relative to the wavelength length of the bass to be reproduced. When designing, usually the cross-sectional area of the inlet and outlet of the annular space channel is different, and the cross-sectional area of the inlet and outlet of the annular tube channel is the same. At this time, the rear-facing precision annular tube composite channel speaker system, when the speaker works at low frequencies, the rear-facing annular The space channel constitutes the ring tube acoustic variable element, and the backward ring tube channel constitutes the ring tube acoustic mass element.

The ring-shaped tube acoustic transducer here has two functions. First, the acoustic transducer can change the force impedance at both ends of the sound through its transformation ratio, that is, change the force impedance of the sound mass element acting on the speaker. Second, through the acoustic transducer The variable ratio amplification effect increases the sound quality of the sound quality component to one end of the speaker equivalently, increasing the total equivalent quality of the speaker, which can reduce the low-frequency force resonance frequency of the speaker and improve the low-frequency radiation efficiency of the speaker. Compared with "A Loudspeaker System", since the smooth annular tube channel is used as the sound transducer, the energy loss of the sound wave passing through the interior is greatly reduced, so that the sound transducer with this structure can be made very precise , which is also the meaning of precision in the name of the precision annular tube compound channel loudspeaker system of the present invention.

In the rear-facing precision annular tube compound channel loudspeaker system, when the speaker works at low frequency, because the channel is a sound quality element, the air in the channel is not compressed, so the ring tube sound variable element and the ring tube sound quality element have At the same volume velocity, the radiated sound waves of the speaker can pass through the first channel without hindrance and loss, and then pass through the channel to the air outside the channel, but this sound quality only exists when the speaker works at low frequencies. When working in the mid-frequency region, this sound quality will disappear. It can be seen that the vibration body of the speaker can work normally and easily from the low-frequency region to the high-frequency region.

In the rear-facing precision annular tube composite channel loudspeaker system, since the rear-facing annular space and the rear-facing annular tube channel have the same friction coefficient, the sound energy loss in the rear-facing precision annular tube composite channel is equivalent to a common sound loss element R _A2 (formed by viscous friction between the air movement in the pipe and the pipe wall). It can be seen that the rear-facing precision annular tube composite channel loudspeaker system has a radiation sound transmission channel that is a composite acoustic structure including an acoustic transducer, an acoustic quality element M _A2 , and an acoustic loss element R _A2 .

In the admittance type analog equivalent circuit, the ring tube acoustic transducer element and the ring tube acoustic mass element have the same volume velocity and the force-impedance transformation at both ends of the acoustic transducer, which is reflected in the parallel relationship of the two elements and the acoustic transducer The transformation ratio of the acoustic transducer, the transformation ratio S ₂ /S ₁ , reflects the force-impedance transformation of the acoustic transducer connected between the loudspeaker and the sound mass element, and will further increase the equivalent effect of the sound mass in the channel The resonating mass on the loudspeaker vibrating body.

The relevant calculations of the rear-facing precision annular tube composite channel speaker system are as follows: 

Assume that the outer sleeve is a round straight tube with an area of S ₁ , and S ₁ is also the effective vibration area of the speaker at low frequencies. The channel is a circular straight channel with an area of S ₂ and a length of L ₂ . _{Then the} mass _{of the} ^air _{in the} channel _{whose area is} S _{2 .} The sound quality is proportional to the length of the channel, that is, the sound quality inside it is inversely proportional to the _S2 area, and its air quality is directly proportional to the _S2 area. This is the characteristic of the ring tube sound quality element, which means a relatively The sound mass in the annular pipe channel with small cross-sectional area is relatively large.

The equivalent mass of M _A0 normalized to the S ₁ plane of the loudspeaker is (S ₁ /S ₂ ) ² M _A0 , where S ₁ /S ₂ is the transformation ratio of the ring tube acoustic transducer. Generally, when S ₁ is greater than S ₂ , it is easier to ensure the existence of sound quality components at low frequencies in the channel, so S ₁ is greater than S ₂ in the application, and (S ₁ /S ₂ ) ² M _A0 is greater than M _A0 at this time. That is, the equivalent sound quality of the channel converted to the loudspeaker vibrating body through the ring-shaped space sound transducer is greatly improved.

In the case of only considering the influence of the composite channel of the backward precision annular tube and not the influence of the composite channel of the forward precision annular tube, it can be known from the low-frequency resonance formula ω0= The effective mass _M includes the equivalent mass of the cone basin, the equivalent mass of the voice coil, the co-vibrating mass at the front of the vibrating body, the co-vibrating mass at the back, and the equivalent value of the sound mass of the sound mass element of the rear-facing ring tube (S ₁ /S ₂ ) ² M _A0 , according to the radiation characteristics of the vibrating body in the sound tube, the whole sound tube contains the co-vibration mass M _MR2 facing the loudspeaker. In practical applications, the composite channel of the precision ring tube is a short channel, so only The equivalent mass of M _A2 of the sound quality of the sound quality channel (S ₁ /S ₂ ) ² M _A0 is greater than the co-vibration mass M _MR2 of the loudspeaker vibrating body, and the total equivalent of the rear-facing precision ring tube composite channel speaker system M _M will increase. At this time, the resonance mass M _MR2 facing the back of the original loudspeaker is included in (S ₁ /S ₂ ) ² M _A0 , that is, the total equivalent vibration mass M _M =M ₁ +M ₂ +M _MR1 +(S ₁ /S ₂ ) ² M _A0 , which is greater than the total equivalent vibration mass of the loudspeaker M _M =M ₁ +M ₂ +M _MR1 +M _MR2 when there is no precision annular bushing, it can be seen that Adding a value of (S ₁ /S ₂ ) ² M _A0 to the precision ring tube composite channel speaker system makes the low-frequency resonance frequency ω ₀ of the speaker smaller, and the system produces a lower force resonance frequency, which can radiate Lower frequency sounds. During this usage, the situation of the compound channel group of the backward precision annular tube is the same as the principle in the compound channel of the backward precision annular tube.

In the multi-channel front and rear precision ring tube composite channel combined speaker system, the working principle of the radiation transmission of sound waves in the forward precision ring tube composite channel and the radiation transmission of sound waves in the rear precision ring tube composite channel same. Therefore, the above calculation methods and conclusions are not only applicable to the rear-facing precision annular tube composite channel loudspeaker system, but also applicable to the forward-facing precision annular tube composite channel speaker system, that is, the acoustic structure formed by the annular tube channels in the forward precision annular tube composite channel. The mass element can also increase the value of (S ₁ /S ₂ ) ² M _A0 of the speaker, which can also make the low-frequency resonance frequency ω ₀ of the speaker smaller, and the system produces a lower force resonance frequency, which can radiate more low frequency sound. During this usage, the situation in the compound channel group of the forward precision annular tube is the same as the principle in the compound channel of the forward precision annular tube.

Claims (10)

1. backward is that multichannel front and back are to precise annular tube composite channel combination speaker system, comprise cone loudspeaker (1), described cone loudspeaker (1) comprises with the frame (1-1) of radiation port and the vibration cone (1-2) that is connected with frame (1-1), and frame (1-1) is coaxial with vibration cone (1-2); The rear end of described frame (1-1) is provided with circular magnet (1-3), and frame (1-1) is coaxial with circular magnet (1-3); Also comprise the second inner sleeve (2) on excircle that front end is arranged on circular magnet (1-3) and coaxial with circular magnet (1-3), also comprise the outer tube (3) coaxial with the second inner sleeve (2), the front port of outer tube (3) is airtight to be arranged in frame (1-1), and frame radiation port is positioned at the inside of outer tube (3); Formed backward between the outer wall of the second inner sleeve (2) and the inwall of outer tube (3) ring pipe passage; It is characterized in that: the frame sidewall front end of described frame (1-1) is with flanging; Also comprise rear end and be arranged on front outer tube (7) on described flanging and coaxial with vibration cone (1-2), described front outer tube (7) inside is provided with the front inner sleeve (8) coaxial with front outer tube (7); Described front inner sleeve (8) is connected with front outer tube (7) is fastened to each other; Formed between the outer wall of front inner sleeve (8) and the inwall of front outer tube (7) forward directionring pipe passage (6);

Between outer tube (3) and the second inner sleeve (2), arrange at least one backward intermediate casing (12), backward intermediate casing (12) is coaxial with circular magnet (1-3); The front end of backward intermediate casing (12) is as far as possible near the peak swing place with vibration cone (1-2) backward correspondence position; Backward intermediate casing (12) is connected to each other with outer tube (3) and the second inner sleeve (2); Backward intermediate casing (12), between outer tube (3) and the second inner sleeve (2), form at least two backward ring pipe channel units (4-1).

2. according to claim 1 backward be multichannel front and back to precise annular tube composite channel combination speaker system, it is characterized in that: also comprise one section with vibrating body cone (1-2) axis (O)centered by round table-like first inner sleeve (5) of axle, between the rear end root that the front port of the first inner sleeve (5) is airtight is connected to frame (1-1) to frame radiation port back edge, first inner sleeve (5) rear end aligns with the second inner sleeve (2) front end and is connected, between the first inner sleeve (5) installation place, front end and the second inner sleeve (2), form level and smooth round table-like transition face; For smoothly transitting between first inner sleeve (5) and the second inner sleeve (2).

3. according to claim 1 backward be that multichannel front and back are to precise annular tube composite channel combination speaker system, it is characterized in that: the trend some group backward block pieces consistent with backward ring pipe channel unit (4-1) are installed in ring pipe channel unit (4-1), in backward block piece rear forsolid or be obturator, be transaudient passage between adjacent backward block piece, each transaudient passage has consistent cross-sectional area along its transaudient direction.

4. backward according to claim 1 or 2 or 3 is that multichannel front and back are to precise annular tube composite channel combination speaker system, it is characterized in that: the some groups of forward direction block pieces that trend is consistent with forward direction ring pipe passage (6) are installed in forward direction ring pipe passage (6), in forward direction block piece forsolid or be obturator, be transaudient passage between adjacent forward direction block piece, each transaudient passage has consistent cross-sectional area along its transaudient direction.

5. backward according to claim 1 or 2 or 3 is that multichannel front and back are to precise annular tube composite channel combination speaker system, it is characterized in that: also comprise at least one forward direction intermediate casing (14) be positioned between described front outer tube (7) and front inner sleeve (8), forward direction intermediate casing (14) is coaxial with vibration cone (1-2); The rear end of forward direction intermediate casing (14) is as far as possible near the peak swing place with vibration cone (1-2) forward direction correspondence position; Described forward direction intermediate casing (14), front outer tube (8) and front inner sleeve (7) are by connection fastened to each other; Forward direction intermediate casing (14), between front outer tube (8) and front inner sleeve (7), form at least two forward direction ring pipe channel units (6-1).

6. according to claim 5 backward be that multichannel front and back are to precise annular tube composite channel combination speaker system, it is characterized in that: the some groups of forward direction block pieces that trend is consistent with forward direction ring pipe channel unit (6-1) are installed in forward direction ring pipe channel unit (6-1), in forward direction block piece forsolid or be obturator, be transaudient passage between adjacent forward direction block piece, each transaudient passage has consistent cross-sectional area along its transaudient direction.

7. backward according to claim 1 or 2 or 3 be multichannel front and back to precise annular tube composite channel combination speaker system, it is characterized in that: also comprise one section with vibrating body cone (1-2) axis (O)centered by the retaining piece (9) of axle, the rear end of retaining piece (9) be positioned at vibration cone (1-2) peak swing place front and as far as possible near this peak swing place; The front end of retaining piece (9) aligns with front inner sleeve (8) rear end and is connected, and the outer wall of retaining piece (9) is even surface; For smoothly transitting between retaining piece (9) and front inner sleeve (8).

8. according to claim 4 backward be multichannel front and back to precise annular tube composite channel combination speaker system, it is characterized in that: also comprise one section with vibrating body cone (1-2) axis (O)centered by the retaining piece (9) of axle, the rear end of retaining piece (9) be positioned at vibration cone (1-2) peak swing place front and as far as possible near this peak swing place; The front end of retaining piece (9) aligns with front inner sleeve (8) rear end and is connected, and the outer wall of retaining piece (9) is even surface; For smoothly transitting between retaining piece (9) and front inner sleeve (8).

9. according to claim 5 backward be multichannel front and back to precise annular tube composite channel combination speaker system, it is characterized in that: also comprise one section with vibrating body cone (1-2) axis (O)centered by the retaining piece (9) of axle, the rear end of retaining piece (9) be positioned at vibration cone (1-2) peak swing place front and as far as possible near this peak swing place; The front end of retaining piece (9) aligns with front inner sleeve (8) rear end and is connected, and the outer wall of retaining piece (9) is even surface; For smoothly transitting between retaining piece (9) and front inner sleeve (8).

10. according to claim 6 backward be multichannel front and back to precise annular tube composite channel combination speaker system, it is characterized in that: also comprise one section with vibrating body cone (1-2) axis (O)centered by the retaining piece (9) of axle, the rear end of retaining piece (9) be positioned at vibration cone (1-2) peak swing place front and as far as possible near this peak swing place; The front end of retaining piece (9) aligns with front inner sleeve (8) rear end and is connected, and the outer wall of retaining piece (9) is even surface; For smoothly transitting between retaining piece (9) and front inner sleeve (8).