TWI862163B - Speaker system and automatic tuning method thereof - Google Patents

Abstract

A speaker system comprises two speaker devices. Each of the two speaker devices comprises a sound output component, and the first speaker device is configured to output a first sound under the control of the first audio signal. The second speaker device comprises a second sound output component, a sound receiving component and a comparison control circuit. The second sound output component is configured to output a second sound under the control of the second audio signal. The sound-receiving component is configured to receive sound to generate sound-receiving signals associated with the first sound and the second sound. The comparison control circuit is electrically connected to the second sound output component and the sound receiving component, and obtains the first audio signal, compares the strength of the sound-receiving signal with at least one preset strength to generate a tuning magnification factor, and modulates the obtained first audio signal according to the tuning magnification factor to update the second audio signal.

Description

Speaker system and automatic tuning method thereof

The present invention relates to a speaker system and an automatic tuning method thereof, and in particular to a speaker system having two speaker devices and an automatic tuning method thereof.

Currently, audio equipment in school classrooms is generally placed in a certain area of the environment, and usually only 1 to 2 speakers are placed at the front and back of the classroom. Therefore, no matter how high they are placed, each listener will receive inconsistent volume. At this time, the volume needs to be adjusted through the central control (computer host or amplifier), but since there is only one amplifier, no matter how many speakers there are, only one signal source can be adjusted to the same volume, and the purpose of regional volume unification cannot be achieved.

In view of the above, the present invention provides a speaker system and an automatic tuning method thereof.

According to an embodiment of the present invention, a speaker system includes a first speaker device and a second speaker device. The first speaker device includes a first sound output element, which is used to be controlled by a first audio signal of an amplifier or a control host to output a first sound. The second speaker device includes a second sound output element, a sound receiving element and a comparison control circuit. The second sound output element is used to be controlled by a second audio signal to output a second sound. The sound receiving element is used to receive sound to generate a sound receiving signal related to the first sound and the second sound. The comparison control circuit is electrically connected to the second sound output element and the sound receiving element, and is used to obtain the first audio signal, compare the strength of the sound receiving signal with at least one preset strength to generate a tuning factor, and modulate the obtained first audio signal according to the tuning factor to update the second audio signal.

According to an embodiment of the present invention, an automatic tuning method for a loudspeaker system includes: controlling a first sound output element to output a first sound with a first audio signal through an amplifier or a control host; controlling a second sound output element to output a second sound with a second audio signal; performing sound reception to generate a reception signal related to the first sound and the second sound; comparing the strength of the reception signal with the at least one preset strength to generate a tuning factor; and modulating the obtained first audio signal according to the tuning factor to update the second audio signal that controls the second sound output element.

With the above structure, the speaker system and automatic tuning method disclosed in this case can adjust the volume of the secondary speaker by using a sound receiving element to receive and analyze the sound of the main speaker and at least one secondary speaker, that is, the sound receiving element compares the strength of the received sound signal with the target signal and makes appropriate compensation, so that the user can adjust the volume of the main speaker to a fixed level to make the secondary speaker output an appropriate volume without additionally adjusting the volume of the secondary speaker. Accordingly, the appropriate tuning ratio can be obtained in real time by dynamic adjustment according to the comparison result, so that the regional volume can achieve the expected balanced effect.

The above description of the disclosed content and the following description of the implementation method are used to demonstrate and explain the spirit and principle of the present invention, and provide a further explanation of the scope of the patent application of the present invention.

100,100’:Speaker system

1: First speaker device

11: First sound output element

2,2’: Second speaker

21: Second sound output element

22: Radio components

23Comparison control circuit

23a: Comparison of subcircuits

23b: Amplifier

24: Audio processing circuit

200: Control host

S1-S9, S71-S72, S71’-S73’, S61-S63: Steps

FIG1 is a block diagram of a speaker system according to an embodiment of the present invention.

Figure 2 is a flow chart of an automatic tuning method according to an embodiment of the present invention.

FIG3 is a flow chart of the steps of generating tuning magnifications in an automatic tuning method according to an embodiment of the present invention.

FIG4 is a flow chart of the steps of generating tuning magnifications in an automatic tuning method according to another embodiment of the present invention.

FIG5 is a block diagram of a speaker system according to another embodiment of the present invention.

FIG6 is a flow chart of an automatic tuning method according to another embodiment of the present invention.

FIG. 7 is a flow chart of the steps of the filtering operation of the automatic tuning method according to the embodiment of FIG. 6 of the present invention.

The detailed features and advantages of the present invention are described in detail in the following implementation method. The content is sufficient for anyone familiar with the relevant technology to understand the technical content of the present invention and implement it accordingly. According to the content disclosed in this specification, the scope of the patent application and the drawings, anyone familiar with the relevant technology can easily understand the relevant purposes and advantages of the present invention. The following embodiments are to further illustrate the viewpoints of the present invention, but do not limit the scope of the present invention by any viewpoint.

Please refer to FIG. 1, which is a block diagram of a speaker system according to an embodiment of the present invention. As shown in FIG. 1, the speaker system 100 includes a first speaker device 1 and a second speaker device 2. The first speaker device 1 includes a first sound output element 11, which is used to be controlled by a first audio signal (an audio signal transmitted by the control host 200) of a control host 200 to output a first sound. The first audio signal includes audio information. The second speaker device 2 includes a second sound output element 21, a sound receiving element 22 and a comparison control circuit 23. The second sound output element 21 is used to be controlled by a second audio signal (an audio signal adjusted according to the first audio signal) to output a second sound. The second audio signal is a processed (e.g., adjusted according to a tuning factor) audio signal, which includes sound data. The sound receiving element 22 is used to receive sound to generate a received signal related to the first sound and the second sound. The comparison control circuit 23 is electrically connected to the second sound output element 21 and the sound receiving element 22, and is used to obtain the first audio signal, compare the strength of the received signal with at least one preset strength to generate a tuning factor, and modulate the obtained first audio signal according to the tuning factor to update the second audio signal. Here, FIG. 1 exemplarily shows that the speaker system 100 is controlled by the control host 200, and in other embodiments, the control host 200 can be replaced by other audio source devices, that is, the first audio signal can also be generated by other audio source devices, such as an amplifier. Specifically, the control host 200 can be a device that generates the first audio signal, and the amplifier can be a device that receives an audio signal and then amplifies it to generate the first audio signal. This case does not limit the various audio source devices of the first audio signal.

In this example, the first speaker 1 and the second speaker 2 can be connected to and controlled by a control host 200, wherein the control host 200 can be a computer or a sound control device, and connected to the first speaker 1 and the second speaker 2 by wired or wireless means (such as Bluetooth, Wifi, etc.). In terms of physical configuration, the first speaker 1 and the second speaker 2 can be set at different positions in a space (such as a classroom). The first sound output element 11 of the first speaker 1 and the second sound output element 21 of the second speaker 2 can be implemented by speakers (speakers), wherein the first sound output element 11 can be regarded as a main speaker, and the second sound output element 21 can be regarded as a secondary speaker. In particular, the second speaker device 2 is not limited to enclosing the second sound receiving output element 21, the sound receiving element 22 and the comparison control circuit 23 in the same cavity through a housing. The sound receiving element 22 can be a sound receiving microphone for converting the received sound into an electronic sound receiving signal.

The control host 200, the first speaker device 1 and the second speaker device 2 may further include or be externally connected to one or both of a digital/analog converter and an analog/digital converter. For example, the first audio signal emitted by the control host 200 may be an analog signal, which is converted into a digital signal through an analog/digital converter included in or externally connected to the control host 200, and then converted into an analog signal through a digital/analog converter included in or externally connected to the first speaker device 1, and then transmitted to the first sound output element 11. After the first audio signal is converted into a digital signal, it is modulated by the comparison control circuit 23 of the second speaker 2 and becomes a second audio signal (digital signal), and then converted into an analog signal through a digital/analog converter included in or external to the second speaker 2, and then transmitted to the second sound output element 21. In addition, after receiving the radio signal, the sound receiving element 22 of the second speaker 2 can be converted into a digital signal through an analog/digital converter included in or external to the second speaker 2 and then transmitted to the comparison control circuit 23.

The comparison control circuit 23 is further described, which may include a comparison subcircuit 23a and an amplifier 23b, for executing the relevant process of automatic tuning of the speaker system 100. The comparison subcircuit 23a is electrically connected to the sound receiving element 22, and is used to compare the strength of the sound receiving signal with the at least one preset strength to generate the tuning magnification. The amplifier 23b is electrically connected to the comparison subcircuit 23a and the second sound output element 21, and is used to modulate the first audio signal according to the tuning magnification to update the second audio signal transmitted to the second sound output element 21. Furthermore, the comparison subcircuit 23a may include a microcontroller, wherein the microcontroller is used to execute the aforementioned comparison strength function.

Please refer to FIG. 2, which is a flow chart of an automatic tuning method according to an embodiment of the present invention. As shown in FIG. 2, the automatic tuning process includes: step S1: controlling the first sound output element to output the first sound with the first audio signal; step S3: controlling the second sound output element to output the second sound with the second audio signal; step S5: performing sound reception to generate a reception signal related to the first sound and the second sound; step S7: comparing the intensity of the reception signal with at least one preset intensity to generate a tuning factor; and step S9: modulating the first audio signal according to the tuning factor to update the second audio signal that controls the second sound output element.

Please refer to the following description in conjunction with FIG. 1 and FIG. 2. In step S1, the first sound output element 11 is controlled by the first audio signal from the control host 200 to output the first sound; in step S3, the second sound output element 21 is controlled by the second audio signal to output the second sound, wherein the signal value (intensity) of the first audio signal/the second audio signal may correspond to the sound intensity of the first sound/the second sound. Before automatic tuning, the initial second audio signal may be substantially the same as the sound source signal from the control host 200, that is, at this time, the sound intensity of the first sound and the second sound is substantially equal. In addition, there is no specific order relationship between steps S1 and S3. In step S5, the sound receiving element 22 can receive the first and second sounds output by the first sound output element 11 and the second sound output element 21 to generate a sound receiving signal.

In step S7, the comparison control circuit 23 may compare the strength of the received audio signal with at least one preset strength to generate a tuning magnification. The initial value of the tuning magnification may be, for example, 1, and when the system is just started, the comparison control circuit 23 modulates the first audio signal according to the tuning magnification with the initial value to generate an initial second audio signal, that is, the initial second audio signal may be substantially the same as the first audio signal. Thereafter, when the comparison control circuit 23 compares the strength of the received audio signal with at least one preset strength, if the strength of the received audio signal is judged to be too low, a tuning magnification greater than 1 may be generated; conversely, if the strength of the received audio signal is judged to be too high, a tuning magnification less than 1 may be generated. In step S9, the comparison control circuit 23 can modulate the first audio signal according to the tuning factor to update the second audio signal of the second sound output element 21, so as to adjust the output volume of the second speaker 2 and further produce a sound balance effect.

Please further refer to FIG. 3, which is a flow chart of the steps of generating a tuning magnification in an automatic tuning method according to an embodiment of the present invention. As shown in FIG. 3, the step S7 of generating a tuning magnification executed by the speaker system of this example between the steps S5 and S9 shown in FIG. 2 may include step S71: determining that the intensity of the received audio signal belongs to a determined intensity range among a plurality of pre-stored preset intensity ranges; and step S72: obtaining one of the pre-stored preset magnifications corresponding to the determined intensity range as the tuning magnification. Specifically, in step S71, the comparison control circuit can store multiple preset intensity ranges and multiple preset magnifications corresponding to the preset intensity ranges, and use one of the multiple preset intensity ranges corresponding to the intensity of the received signal as a determination intensity range. In step S72, the comparison control circuit can obtain one of the preset magnifications corresponding to the determination intensity range as the tuning magnification based on the above determination intensity range. For the preset intensity range and the corresponding preset magnification in this example, please refer to the following Table 1 as an example.

In this example, the comparison control circuit 23 shown in FIG. 1 may include a microcontroller storing a correspondence between a preset intensity range and a preset magnification (as shown in Table 1). Alternatively, the microprocessor of the comparison subcircuit 23a shown in FIG. 1 may store a correspondence between a preset intensity range and a preset magnification. As an example, referring to Table 1, the user may set or select a sound intensity range greater than or equal to 63 and less than 66 decibels as a target intensity range. When the intensity of the sound signal received by the sound receiving element is less than the target intensity range, the comparison control circuit can determine in step S71 that the intensity of the sound signal (e.g., 58 decibels) belongs to a determination intensity range in the preset intensity range (i.e., greater than or equal to 57 and less than 60 decibels), and obtain a corresponding one from a plurality of preset magnifications as a tuning magnification (i.e., 2.5 times) in step S72. Through the above steps, the comparison control circuit can modulate the first audio signal according to the appropriate tuning magnification in step S9 to update the second audio signal to adjust the volume of the second sound output by the second sound output element. Table 1 above is applicable to situations where the strength of the radio signal falls within various ranges, that is, no matter when the strength of the radio signal is greater than or less than the target strength range, the comparison control circuit can generate the corresponding tuning magnification.

Furthermore, the automatic tuning method of the present invention can be repeatedly executed to continuously adjust the output volume of the second sound output element. When the intensity of the received signal has fallen within the target intensity range, the comparison control circuit can generate a preset magnification of one, so that the intensity of the modulated second audio signal is the same as the intensity before modulation to achieve a stable state. In the above example, after the second audio signal is modulated at a 2.5-fold tuning magnification to generate the second audio signal, the receiving element can continue to receive the sound. If the intensity of the received signal has fallen within the target intensity range, the comparison control circuit can generate an updated tuning magnification (1x) in step S71, and multiply the updated tuning magnification (1x) by the original tuning magnification (2.5x) in step S72 to generate another tuning magnification (2.5x), that is, maintain the original tuning magnification. Through the above method, the volume of the second sound output element can be continuously adjusted, and the sound intensity received by the sound receiving element can be maintained within the target intensity range.

In addition, the default intensity range and the corresponding default magnification of this example can also be shown in Table 2 and Table 3 below.

As can be seen from Tables 1 to 3 above, the automatic tuning method of the present case can select the relationship between the preset intensity range and the preset magnification according to different target intensity ranges. In particular, the comparison control circuit can determine the at least one preset intensity according to the intensity of the first audio signal. For example, when the intensity of the first audio signal corresponds to a volume of 67 decibels, the comparison control circuit can determine the preset intensity range and the preset magnification as shown in Table 2 accordingly. Alternatively, when the intensity of the first audio signal corresponds to a volume of 61 decibels, the comparison control circuit can determine the preset intensity range and the preset magnification as shown in Table 3 accordingly. However, in other embodiments, the comparison control circuit may not determine the at least one preset intensity according to the intensity of the first audio signal. For example, when the user wants the listeners in the field to hear a sound volume of about 64 decibels evenly and stably, the comparison control circuit can be set to perform automatic tuning according to the intensity-multiplier relationship shown in Table 1. Or, for example, the automatic tuning is initially performed according to the intensity-multiplier relationship shown in Table 1, and then when one of the speaker devices moves, causing the distance between the first and second speaker devices to change, the volume of the second sound can be increased or decreased with reference to the preset intensity range and preset multiplier shown in Table 2 or Table 3, so that the listeners in the field can hear the appropriate volume evenly and stably. In other words, the volume of the second sound can be adjusted according to the actual auditory perception of the listeners in the field.

The aforementioned automatic tuning method for generating a tuning factor according to a preset strength may include various implementations. Please refer to FIG. 4, which is a flow chart of the steps of generating a tuning factor of the automatic tuning method according to another embodiment of the present invention. As shown in FIG. 4, the step S7 of generating a tuning factor executed by the speaker system of this example between the steps S5 and S9 shown in FIG. 2 may include step S71': obtaining a relationship between a plurality of preset difference values and a plurality of preset factors; step S72': comparing a difference value between the strength of the received signal and a target strength; and step S73': determining the tuning factor corresponding to the received signal according to the relationship. For example, please refer to Table 4 below.

In step S71', the comparison control circuit can obtain the relationship shown in Table 4. In step S72', the comparison control circuit can first obtain a target intensity and compare the difference between the intensity of the received signal and the target intensity. For example, if the target intensity is 60 decibels and the intensity of the received signal is 65 decibels, the difference between the two is 5 decibels. In step S73', the comparison control circuit can determine the tuning factor according to the above relationship. Taking the above example, a difference of 5 decibels corresponds to a tuning factor of 0.5 times. Through this scheme, the comparison control circuit can adjust the intensity of the second audio signal, that is, the output volume of the second sound output element, according to the difference between the intensity of the received signal and the target intensity. It should be noted that, regardless of the schemes in Tables 1 to 4 above, the parameters therein can be adjusted according to actual needs, and this scheme is not limited. In particular, the value of the above-mentioned preset magnification can be adjusted according to the distance between the first speaker and the second speaker, the size of the space in which they are installed, or the openness of the environment and the echo condition. In addition, the difference value described in this example is not limited to the difference between the subtraction and division ratios of the audio signal intensities, but should cover the difference value in a broad sense.

Please refer to FIG5, which is a block diagram of a speaker system according to another embodiment of the present invention. As shown in FIG5, the speaker system 100' of this embodiment, compared with the speaker system 100 shown in FIG3, also includes a first speaker device 1 and a second speaker device 2' connected to the control host 200. The first speaker device 1 includes a first sound output element 11, and the second speaker device 2 includes not only a second sound output element 21, a sound receiving element 22, and a comparison control circuit 23 (comparison sub-circuit 23a and amplifier 23b), but also an audio processing circuit 24, which is electrically connected to the sound receiving element 22 and the comparison control circuit 23. Please further refer to FIG6, which is a flow chart of an automatic tuning method according to another embodiment of the present invention. As shown in FIG6 , the automatic tuning method of this example may further include step S6 executed by the audio processing circuit 24 between the above steps S5 and S7: receiving a third audio signal (related information of the first audio signal) and a received audio signal, and selectively performing a filtering operation on the received audio signal according to the third audio signal.

Please further refer to FIG. 7 , which is a flow chart of the filtering operation steps of the automatic tuning method according to the embodiment of FIG. 6 of the present invention. As shown in FIG7 , the step S6 of selectively performing filtering operation executed between the step S5 of generating the received audio signal and the step S7 of generating the tuning factor in the automatic tuning method of this example may include the step S61: capturing a background signal corresponding to an ambient sound in the received audio signal according to the third audio signal; the step S62: determining whether the signal value of the background signal exceeds an unexpected audio threshold; if so, executing the step S63: filtering the background signal from the received audio signal through the filtering operation, and then executing the aforementioned step S7; if not, directly executing the aforementioned step 7. In one implementation, the unexpected audio threshold may be positively correlated to the strength of the first audio signal. For example, when the strength of the first audio signal is greater, the volume of the first sound is also greater, so that a higher background signal can be tolerated in the received audio signal.

In this example, the audio processing circuit 24 may include a filter and a microcontroller to perform pre-processing (filtering operation) on the received signal to reduce the sound signals in the received signal except for the first sound and the second sound, so as to avoid the comparison control circuit 23 from being interfered by noise when processing the received signal. For example, in step S61, the audio processing circuit 24 receives the first audio signal and the third audio signal except for the first audio signal and the second audio signal, and performs spectrum analysis on the third audio signal and the received signal, compares the sound components of the two, and regards the different sound components as the background signal of the ambient sound. Next, in steps S62 and S63, the audio processing circuit 24 can selectively filter the background signal.

Although the above description of the present case is based on two speaker devices, in some embodiments, the speaker system may include a main speaker device (corresponding to the first speaker device 1 in FIG. 1 ) and multiple secondary speaker devices (corresponding to the second speaker device 2 in FIG. 1 ), and each secondary speaker device may include the components included in the aforementioned second speaker device and may perform the aforementioned operation. In other words, by setting a secondary speaker device with a tuning mechanism in the space, the volume in the space can be effectively balanced without affecting the output volume of the main speaker device, thereby avoiding the problem of excessive volume at a specific location in the space and excessive volume at other locations. The speaker system and automatic tuning method of the present case can also dynamically adjust the output volume of the secondary speaker device according to the current relative position between the main and secondary speaker devices through a feedback mechanism. For example, the main and secondary speaker devices can be located in the front and back, or the left and right sides of a space, but are not limited thereto.

With the above structure, the speaker system and automatic tuning method disclosed in this case can adjust the volume of the secondary speaker by using a sound receiving element to receive and analyze the sound of the main speaker and at least one secondary speaker, that is, the sound receiving element compares the strength of the received sound signal with the target signal and makes appropriate compensation, so that the user can only adjust the volume of the main speaker to a fixed level to make the secondary speaker output an appropriate volume without additionally adjusting the volume of the secondary speaker. Accordingly, the appropriate tuning factor can be obtained in real time by dynamic adjustment according to the comparison result, so that the regional volume can achieve the expected balanced effect. In addition, considering that the sound receiving element may receive unexpected noise signals (such as ambient sound, echo, etc.), the background signal can be eliminated through the audio processing circuit first, and then the intensity comparison is performed to adjust the magnification. This can reduce the impact of environmental noise, thereby making the result of the sub-speaker volume adjustment more in line with expectations.

Although the present invention is disclosed as above by the aforementioned embodiments, it is not intended to limit the present invention. Any changes and modifications made within the spirit and scope of the present invention are within the scope of patent protection of the present invention. Please refer to the attached patent application for the scope of protection defined by the present invention.

100:Speaker system

1: First speaker device

11: First sound output element

2: Second speaker

21: Second sound output element

22: Radio components

23: Comparison control circuit

23a: Comparison of subcircuits

23b: Amplifier

200: Control host

Claims (13)

A speaker system includes: a first speaker device including a first sound output element for being controlled by a first audio signal of an amplifier or a control host to output a first sound; and a second speaker device including: a second sound output element for being controlled by a second audio signal to output a second sound; and a sound receiving element for receiving sound to generate a sound related to the first sound and the second sound. a radio signal; and a comparison control circuit electrically connected to the second sound output element and the radio element, and used to obtain the first audio signal, compare an intensity of the radio signal with at least one preset intensity to generate a tuning factor, and modulate the obtained first audio signal according to the tuning factor to update the second audio signal, wherein the first speaker device and the second speaker device can move relative to each other. The speaker system as described in claim 1, wherein the comparison control circuit comprises: a comparison subcircuit, electrically connected to the sound receiving element, for comparing the strength of the sound receiving signal with the at least one preset strength to generate the tuning factor; and an amplifier, electrically connected to the comparison subcircuit and the second sound output element, for modulating the first audio signal obtained according to the tuning factor to update the second audio signal. A speaker system as described in claim 1, wherein the comparison control circuit stores a plurality of preset intensity ranges and a plurality of preset magnifications corresponding to the preset intensity ranges, and the comparison control circuit is used to determine whether the intensity of the received signal belongs to a determination intensity range among the preset intensity ranges, and obtain one of the preset magnifications corresponding to the determination intensity range as the tuning magnification. A speaker system as described in claim 1, wherein the comparison control circuit stores a relationship between multiple preset difference values and multiple preset magnifications, and is used to compare a difference value between the strength of the received signal and a target strength, and determine the tuning magnification corresponding to the received signal according to the relationship. A speaker system as described in claim 1, wherein the comparison control circuit is further used to determine the at least one preset intensity according to the intensity of the first audio signal. The speaker system as described in claim 1, wherein the second speaker device further comprises: an audio processing circuit electrically connected to the sound receiving element and the comparison control circuit, for receiving a third audio signal and the sound receiving signal, and selectively performing a filtering operation on the sound receiving signal according to the third audio signal, wherein the third audio signal is related to the first audio signal. As described in claim 6, the audio processing circuit is used to capture a background signal corresponding to an ambient sound in the received audio signal according to the third audio signal, determine whether the signal value of the background signal exceeds an unexpected audio threshold, and when the signal value of the background signal exceeds the unexpected audio threshold, filter the background signal from the received audio signal through the filtering operation. An automatic tuning method, suitable for a first speaker device and a second speaker device that can move relative to each other, comprising: Using an amplifier or a control host, a first audio signal is used to control a first sound output element of the first speaker device to output a first sound; a second audio signal is used to control a second sound output element of the second speaker device to output a second sound; receiving sound to produce A receiving signal related to the first sound and the second sound is generated; a comparison control circuit compares the strength of the receiving signal with at least one preset strength to generate a tuning factor and obtain the first audio signal; and the comparison control circuit modulates the obtained first audio signal according to the tuning factor to update the second audio signal of the second sound output element of the second speaker device. The automatic tuning method as described in claim 8, wherein comparing the strength of the received signal and the at least one preset strength to generate the tuning factor includes: determining that the strength of the received signal belongs to a determined strength range among a plurality of pre-stored preset strength ranges; and obtaining one of the pre-stored preset strength ranges corresponding to the determined strength range as the tuning factor. The automatic tuning method as described in claim 8, wherein comparing the strength of the received signal with the at least one preset strength to generate the tuning factor includes: obtaining a relationship between a plurality of preset difference values and a plurality of preset factors; comparing a difference value between the strength of the received signal and a target strength; and determining the tuning factor corresponding to the received signal according to the relationship. The automatic tuning method as described in claim 8 further comprises: Determining the at least one preset intensity according to the intensity of the first audio signal. The automatic tuning method as described in claim 8 further includes executing with an audio processing circuit: receiving a third audio signal and the received audio signal; and selectively performing a filtering operation on the received audio signal according to the third audio signal, wherein the third audio signal is related to the first audio signal. The automatic tuning method as described in claim 12, wherein the filtering operation on the received audio signal according to the third audio signal comprises: capturing a background signal corresponding to an ambient sound in the received audio signal according to the third audio signal; determining whether the signal value of the background signal exceeds an unexpected audio threshold; and when the signal value of the background signal exceeds the unexpected audio threshold, filtering the background signal from the received audio signal through the filtering operation.

Images