TW201801540A - Speaker having extended frequency and electronic device using the same - Google Patents

Abstract

A speaker having extended frequency and an electronic device using the same are provided. The speaker includes a first sound box, a horn, a second sound box and a sound tube. The horn is disposed in the first sound box. The horn faces the second sound box. The sound tube is connected to the second sound box.

Description

Frequency extending speaker and electronic device using the same

The present invention relates to a speaker and an electronic device using the same, and more particularly to a frequency extending speaker and an electronic device using the same.

With the advancement of technology, various electronic devices continue to evolve. Many portable electronic devices are equipped with speakers to play music or sound effects. However, in order to respond to the user's demand for convenient carrying of the electronic device, the electronic device is oriented toward thinning, and the internal speaker must also be thinned.

The industry has found that when the speaker is becoming thinner, it seriously affects the bass sound. Even through various attempts, the bass sound can usually only reach 600Hz, and can not express the bass sound below 600Hz, and can not satisfy the user's sense of hearing.

The invention relates to a frequency extending speaker and an electronic device using the same, which utilizes the design of the second speaker and the sound tube, and has a good shape at 600 Hz to 250 Hz when using a thin or miniaturized speaker unit. Performance, and the bass sound is extended to 250Hz, thus satisfying the user's sense of hearing.

According to a first aspect of the invention, a loudspeaker is proposed. The speaker includes a first speaker, a speaker unit, a second speaker and a sound tube. The speaker unit is disposed in the first speaker. The speaker unit faces the second speaker. The sound tube is connected to the second speaker.

According to a first aspect of the invention, an electronic device is presented. The electronic device includes a speaker and an audio processing circuit. The speaker includes a first speaker, a speaker unit, a second speaker and a sound tube. The speaker unit is disposed in the first speaker. The speaker unit faces the second speaker. The sound tube is connected to the second speaker. The sound processing circuit is used to provide an audio signal to the speaker.

In order to better understand the above and other aspects of the present invention, the preferred embodiments are described below, and in conjunction with the drawings, the detailed description is as follows:

100‧‧‧Electronic devices

110, 210, 310, 410, 510‧‧‧ Speakers

111, 211, 311, 411, 511‧‧‧ first speaker

111a‧‧‧Outer surface

112, 212, 312, 412, 512‧‧‧ second speaker

112a‧‧‧ Opening

112b‧‧‧ inner surface

113, 213, 313, 413‧‧‧ horn single

113a‧‧‧Vibration membrane

114, 214, 314, 414, 514‧‧ ‧ sound tube

114a‧‧‧ Entrance

114b‧‧‧Export

120‧‧‧Audio processing circuit

390‧‧‧ screw column

C1, C2‧‧‧ frequency curve

L114‧‧‧ length

FIG. 1 is a schematic diagram of an electronic device according to an embodiment.

Figure 2 is a schematic view showing the appearance of the speaker.

Figure 3 is a schematic diagram showing the internal space of the speaker.

Figure 4 is a schematic side view of the speaker.

Figure 5 is a schematic diagram showing the frequency curve.

FIG. 6 is a schematic diagram of a speaker according to another embodiment.

FIG. 7 is a schematic diagram of a speaker according to another embodiment.

FIG. 8 is a schematic diagram of a speaker according to another embodiment.

FIG. 9 is a schematic diagram of a speaker according to another embodiment.

Please refer to FIG. 1 , which illustrates a schematic diagram of an electronic device 100 according to an embodiment. The electronic device 100 is, for example, a tablet computer, a notebook computer, a smart phone, or a handheld audio device. The electronic device 100 includes a speaker 110 and an audio processing circuit 120. The sound processing circuit 120 is configured to provide an audio signal S0 to the speaker 110. In response to the user's demand for convenient carrying of the electronic device 1000, the electronic device 1000 is developed toward thinning, and the internal speaker 110 must also be thinned or miniaturized.

Please refer to FIG. 2 to FIG. 2 , FIG. 2 is a schematic diagram showing the appearance of the speaker 110 , FIG. 3 is a schematic diagram showing the internal space of the speaker 110 , and FIG. 4 is a schematic side view of the speaker 110 . The speaker 110 includes a first speaker 111, a speaker unit 113, a second speaker 112, and a sound tube 114. In order to meet the requirements of the thinning of the speaker 110, the length of the horn unit 113 is 1.5 to 2.6 cm, the length of the horn unit 113 is 0.8 to 1.1 cm, and the thickness of the horn unit 113 is 0.2 to 0.4 cm. In one embodiment, the length, width, and thickness of the horn unit 113 are 1.6 cm, 0.9 cm, and 0.3 cm, respectively.

As shown in Fig. 4, the first speaker 111 is a closed type speaker. The speaker unit 113 is disposed in the first speaker 111. The diaphragm 113a of one of the horn units 113 is disposed on the outer surface 111a of the first speaker 111. The speaker unit 113 transmits the resonance of the first speaker 111 to expand the sound range of the sound effect. However, since the horn unit 113 is small, even with the resonance of the first speaker 111, the bass sound effect can usually only reach 600 Hz, and the bass sound effect below 600 Hz cannot be exhibited.

As shown in FIG. 3, the horn unit 113 faces the second speaker 112. The sound tube 114 is connected to one of the openings 112a of the second speaker 112. The second speaker 112 is an open speaker. As shown in FIG. 4, the speaker unit 113 is disposed at the junction of the first speaker 111 and the second speaker 112. The diaphragm 113a of the horn unit 113 is disposed on one inner surface 112b of the second speaker 112.

The second speaker 112 and the sound tube 114 pass the Helmholtz principle to effectively extend the bass sound to a lower frequency range. Please refer to the following formula (1). The structural design of the second speaker 112 and the sound guiding tube 114 can be arranged according to the following formula (1):

為圓週率，A為導音管114的截面積，V為第二音箱112的體積，L為導音管114的長度(例如是第3圖之長度L114)。 Where f is the frequency and V _s is the propagation rate of the sound wave,

For the pi, A is the cross-sectional area of the sound tube 114, V is the volume of the second speaker 112, and L is the length of the sound tube 114 (for example, the length L114 of FIG. 3).

That is, in order to enable the speaker 110 to provide a bass sound wave having a frequency lower than 600 Hz, the length of the sound guiding tube 114 is designed to be negatively correlated with the frequency of the bass sound wave, and the cross-sectional area of the sound guiding tube 114 is designed to be the same as the bass sound wave. Frequency is positive Correspondingly, the volume of the second speaker 112 is designed to be inversely related to the frequency of the bass sound wave.

In other words, according to the frequency to be achieved by the bass sound wave, the length of the sound guiding tube 114, the cross-sectional area of the sound guiding tube 114 and the volume of the second speaker 112 can be structurally arranged according to the following formula (2):

The length of the sound tube 114 can be structurally arranged according to the following formula (3):

The cross-sectional area of the sound guiding tube 114 and the volume of the second speaker 112 can be structurally arranged according to the following formula (4):

The volume of the second speaker 112 can be structurally arranged according to the following formula (5):

For example, the volume of the second speaker 112 can be designed to be 8 to 9 cubic centimeters, the length of the sound guiding tube 114 can be designed to be 11 to 13 cm, and the cross-sectional area of the sound guiding tube 114 can be designed to be 0.2 to 0.4 square centimeters. In one embodiment, the volume of the second speaker 112 can be designed to be 8.9 cubic centimeters, the length of the sound guiding tube 114 can be designed to be 1.242 cm, and the length and width of the cross-sectional area of the sound guiding tube 114 can be designed to be 0.59 cm and 0.6 cm. .

In an embodiment, the sound guide tube 114 can employ a uniform cross-sectional area to achieve a better acoustic wave derivation effect. That is, as shown in FIG. 3, the cross-sectional area of the sound guiding tube 114 is substantially the same from the inlet 114a of the sound guiding tube 114 to the outlet 114b of the sound guiding tube 114.

In one embodiment, as shown in FIG. 3, in order to allow the speaker 110 to occupy no excessive space, the sound guide tube 114 can be designed in a curved S shape through a plurality of partition plates. Alternatively, the sound tube 114 can also be designed in a U shape.

Please refer to FIG. 5, which shows a schematic diagram of frequency curves C1 and C2. When the horn unit 113 resonates only by the first speaker 111, the frequency curve C1 is measured. The horn unit 113 measures the frequency curve C2 not only by the first speaker 111 but also by the second speaker 112 and the sound tube 114. As shown by the frequency curve C1, the bass sound can only reach 600 Hz, and it cannot express the bass sound below 600 Hz. As shown by the frequency curve C2, the bass sound has a good performance at 600Hz~250Hz, which makes the bass efficiency extend to 250Hz, thus satisfying the user's sense of hearing.

Please refer to FIG. 6 , which illustrates a schematic diagram of a speaker 210 according to another embodiment. In this embodiment, the first speaker 211, the second speaker 212, and the speaker unit 213 of the speaker 210 are similar to the first speaker 111, the second speaker 112, and the speaker unit 113 of FIG. 3, and the description thereof will not be repeated here. . The sound tube 214 of the speaker 210 can extend along the edges of the second speaker 212 and the first speaker 211 to reduce the overall length of the speaker 210.

Please refer to FIG. 7 , which illustrates a speaker 310 according to another embodiment. Schematic diagram. In this embodiment, the first speaker 311, the second speaker 312, and the speaker unit 313 of the speaker 310 are similar to the first speaker 111, the second speaker 112, and the speaker unit 113 of FIG. 3, and the description thereof will not be repeated here. . The sound tube 314 of the speaker 310 can avoid the screw post 390 (or other various components) and extend along the edge of the screw post 390 to meet the structural design requirements.

Please refer to FIG. 8 , which illustrates a schematic diagram of a speaker 410 according to another embodiment. In this embodiment, the first speaker 411, the second speaker 412, and the sound tube 414 of the speaker 410 are sequentially stacked. The speaker unit 413 is disposed at a junction of the first speaker 411 and the second speaker 412. The first speaker 411, the second speaker 412, and the sound tube 414 are disposed in a stacked manner to effectively reduce the overall length of the speaker 410.

Please refer to FIG. 9 , which illustrates a schematic diagram of a speaker 510 according to another embodiment. In this embodiment, the first speaker 511 and the second speaker 512 of the speaker 510 are not limited to a rectangular parallelepiped or a cube, and the first speaker 511 and the second speaker 512 may adopt a circular (or elliptical) cylinder. The second speaker 512 is stacked on top of the first speaker 511. The sound tube 514 extends along the edges of the first speaker 511 and the second speaker 512 such that the speaker 510 substantially forms a circular (or elliptical) cylinder.

According to the above embodiment, when the speaker is thinned or miniaturized, the speaker can be designed through the second speaker and the sound tube, so that the bass sound still has a good performance at 600 Hz to 250 Hz, and the bass efficiency is extended. Up to 250Hz, to meet the user's sense of hearing.

In conclusion, the present invention has been disclosed in the above preferred embodiments, and is not intended to limit the present invention. General knowledge in the technical field to which the present invention pertains Various changes and modifications can be made without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

110‧‧‧Speakers

111‧‧‧First speaker

112‧‧‧Second speaker

112a‧‧‧ Opening

113‧‧‧ horn monomer

114‧‧‧Guide tube

114a‧‧‧ Entrance

114b‧‧‧Export

L114‧‧‧ length

Claims (10)

A speaker includes: a first speaker; a speaker unit disposed in the first speaker; a second speaker, the speaker unit faces the second speaker; and a sound tube connected to the second speaker . The speaker of claim 1, wherein the speaker is configured to provide a bass sound wave having a frequency lower than 600 Hz, and a length of the sound tube is inversely related to the frequency of the bass sound wave. The speaker of claim 1, wherein the speaker is configured to provide a bass sound wave having a frequency lower than 600 Hz, and a cross-sectional area of the sound tube is positively correlated with the frequency of the bass sound wave. The speaker of claim 1, wherein the speaker is configured to provide a bass sound wave, and one of the bass sound waves has a frequency lower than 600 Hz, and a volume of the second speaker is negatively correlated with the frequency of the bass sound wave. The speaker of claim 1, wherein the sound guiding tube has a uniform cross-sectional area. The speaker of claim 1, wherein the sound guiding tube is curved. The speaker according to claim 1, wherein the speaker unit has a diaphragm, and the diaphragm is disposed on an inner surface of the second speaker. The speaker according to claim 1, wherein the first speaker system As a closed speaker, the second speaker is an open speaker, and the sound pipe is connected to one of the openings of the second speaker. The speaker of claim 1, wherein the speaker unit is disposed at a junction of the first speaker and the second speaker. An electronic device comprising: a speaker, comprising: a first speaker; a speaker unit disposed in the first speaker; a second speaker, the speaker unit facing the second speaker; and a sound tube, Connected to the second speaker; and an audio processing circuit for providing an audio signal to the speaker.