WO2022242101A1

WO2022242101A1 - Vibration diaphragm control circuit, vibration diaphragm control method, chip and electronic device

Info

Publication number: WO2022242101A1
Application number: PCT/CN2021/134519
Authority: WO
Inventors: 朱马; 姚炜
Original assignee: 上海艾为电子技术股份有限公司
Priority date: 2021-05-21
Filing date: 2021-11-30
Publication date: 2022-11-24
Also published as: CN115379357A

Abstract

Provided in the present application are a vibration diaphragm control circuit, a vibration diaphragm control method, a chip and an electronic device. The vibration diaphragm control circuit comprises: N input signal transmission circuits, N gain adjustment circuits, a comparator and N gain adjunct circuits. The method comprises: acquiring gains of a plurality of stereo electroacoustic conversion unit branches in a vibration diaphragm control circuit, then superimposing preset gain values, so as to obtain a reduced gain value in each circuit, and taking the minimum value in each circuit on the basis of the reduced gain value; and then respectively superimposing the corresponding preset gain value on the basis of the minimum value. Gains of a plurality of stereo electroacoustic conversion units are linked, and the relative signal amplitude of a plurality of processed sound tracks is relatively constant, and it is thus ensured that the performance of the stereo electroacoustic conversion units that have a high sound amplitude bearing capacity is exerted as much as possible on the premise that the stereo electroacoustic conversion units that have a low sound amplitude bearing capacity can be free from wire breakage or burning-out.

Description

A diaphragm control circuit, a diaphragm control method, a chip and electronic equipment

This application claims the priority of the Chinese patent application submitted to the China Patent Office on May 21, 2021, the application number is 202110557414.4, and the invention title is "a diaphragm control circuit, diaphragm control method, chip and electronic equipment". The entire contents are incorporated by reference in this application.

technical field

The invention relates to the technical field of signal processing, in particular to a diaphragm control circuit, a diaphragm control method, a chip and electronic equipment.

Background technique

In terminal products, such as stereo audio applications of mobile phones, stereo sound is provided by the stereo electro-acoustic conversion unit (speaker) located below the mobile phone and the stereo electro-acoustic conversion unit (earpiece) located above, respectively, and there is an asymmetric difference between the speaker and the earpiece , The left and right channels of the stereo sound source itself will also have differences. The sound effect algorithm will involve the dynamic range control (DRC) module, which can amplify the small signal in the signal, increase the output power of the two stereo electroacoustic conversion units, the speaker and the earpiece, and improve the loudness and strength of the sound; the DRC module will also The large signal in the signal is suppressed to protect the diaphragm amplitude of the two stereo electro-acoustic conversion units of the speaker and the earpiece from being too large to break the line and cause reliability problems.

However, when the left and right channels of the stereo electroacoustic conversion unit in the electronic device are asymmetrical, the problem of weakening of the sound effect will occur.

Contents of the invention

In view of this, the present invention provides a diaphragm control circuit, a diaphragm control method, a chip and an electronic device to solve the problem of weakening sound effects in the prior art when the left and right channels are asymmetrical.

To achieve the above object, the present invention provides the following technical solutions:

A diaphragm control circuit, applied to an electronic device including N stereo electroacoustic conversion units, wherein N is an integer, and N is greater than or equal to 2, and the diaphragm control circuit includes:

N input signal transmission circuits, N gain adjustment circuits, comparators and N gain additional circuits;

The Mth input signal transmission circuit is connected to the Mth gain adjustment circuit, the Mth gain adjustment circuit is connected to the comparator, the output terminal of the comparator is connected to the Mth gain addition circuit, and the Mth gain addition circuit The output terminal is connected to the Mth input signal transmission circuit, M=1, 2, ... N;

Wherein, each of the gain adjustment circuits is used to receive a corresponding input signal, calculate an initial gain value according to the input signal, and process the initial gain value according to a preset gain value to obtain a reduced gain value;

The comparator receives the N reduced gain values of the N gain adjustment circuits, and takes the minimum value after comparison;

Each of the gain addition circuits is used to receive the preset gain value of the corresponding gain adjustment circuit and process the minimum value;

The input signal transmission circuit is used to receive the output signal of the corresponding gain adding circuit, process the corresponding input signal, and obtain the driving signal corresponding to the stereo electroacoustic conversion unit.

Preferably, in the above diaphragm control circuit, each input signal transmission circuit includes a multiplier, and one end of the multiplier is used to receive a corresponding input signal.

Preferably, in the above diaphragm control circuit, each input signal transmission circuit further includes a delay device;

The input end of the delayer is used to receive the input signal;

The output terminal of the delayer is connected with the input terminal of the multiplier in the input signal transmission circuit;

The extension times of the delayers in all input signal transmission circuits are the same.

Preferably, in the above diaphragm control circuit, each gain adjustment circuit includes a dynamic range control module and a first calculation module, the input end of the dynamic range control module is used to receive the input signal, and according to the input Signal calculation to obtain the initial gain value; the input terminal of the first calculation module is connected to the output terminal of the dynamic range control module, and is used to subtract the preset gain value from the initial gain value to obtain the Lower the gain value.

Preferably, in the above diaphragm control circuit, each gain additional circuit includes a second calculation module, the input terminal of the second calculation module is connected to the output terminal of the comparator, and receives the corresponding gain adjustment circuit. The preset gain value, so that the smaller value increases the preset gain value; the output of the second calculation module is connected to the multiplier in the corresponding input signal transmission circuit, and the multiplier converts the input signal multiplied by the output signal of the second calculation module in the corresponding gain addition circuit to obtain the driving signal corresponding to the stereo electroacoustic conversion unit.

Preferably, in the above diaphragm control circuit, the first calculation modules are subtracters; the second calculation modules are adders;

Or, the first calculation modules are all adders; the second calculation modules are all subtractors;

Or, the first calculation module is a divider; the second calculation module is a multiplier;

Or, the first calculation modules are all multipliers; the second calculation modules are all dividers.

The present invention also provides a diaphragm control method, based on the diaphragm control circuit described in any one of the above, the diaphragm control method includes:

Get N input signals, where N is an integer, and N is greater than or equal to 2;

Calculate and obtain N initial gain values according to N input signals, and respectively superimpose corresponding preset gain values on the N initial gain values to obtain corresponding N reduced gain values;

Compare N reduced gain values and take the minimum value;

Based on the minimum value, respectively increase the Mth preset gain value and multiply it with the Mth input signal as the driving signal of the Mth stereo electroacoustic conversion unit, M=1, 2, ... N.

Preferably, in the above diaphragm control method, based on the minimum value, the Mth preset gain value is increased respectively, and multiplied by the Mth input signal as the driving signal of the Mth stereo electroacoustic conversion unit, M= 1, 2, ... N, including:

performing delay processing on the N input signals;

Based on the minimum value, the Mth preset gain value is increased respectively, and multiplied with the Mth input signal after delay processing as the driving signal of the Mth stereo electroacoustic conversion unit, M=1, 2, . . . N.

The present invention also provides a chip, which includes the diaphragm control circuit described in any one of the above.

An electronic device comprising:

N stereo electroacoustic conversion units, and a diaphragm control circuit, where N is an integer, and N is greater than or equal to 2;

The diaphragm control circuit includes N signal input terminals and N signal output terminals;

The Mth signal input terminal is used to receive the Mth input signal, M=1, 2, ... N;

The Mth signal output terminal is connected to the Mth stereo electro-acoustic conversion unit;

Wherein, the diaphragm control circuit is the diaphragm control circuit described in any one of claims 1-6.

Preferably, in the above-mentioned electronic device, the electronic device is a mobile phone, a tablet computer or an audio-visual player.

Preferably, in the above electronic device, N=2, the first stereo electro-acoustic conversion unit is an earpiece, and the second stereo electro-acoustic conversion unit is a speaker.

It can be seen from the above technical solutions that the diaphragm control circuit provided by the present invention is applied in electronic equipment including multiple stereo electroacoustic conversion units. The diaphragm control circuit includes: N input signal transmission circuits, N gain adjustment circuits, A comparator and N additional gain circuits; after obtaining the gains of multiple stereo electroacoustic conversion unit branches in the diaphragm control circuit, and then superimposing the preset gain value to obtain the reduced gain value in each circuit, based on the reduced gain value , take the minimum value in each circuit; then superimpose the corresponding preset gain values based on the minimum value, thus ensuring that the final gain values in multiple stereo electro-acoustic conversion unit branches are different, so that stereo electro-acoustic conversion units with different tolerances The gain values of the sound conversion units are different. On the basis of ensuring that the stereo electro-acoustic conversion units with poor sound amplitude tolerance are not damaged, the performance of other stereo electro-acoustic conversion units with better sound amplitude tolerance is maximized, thereby The characteristics of the stereo electro-acoustic conversion unit taking into account the safety and the ability to withstand different sound amplitudes, avoiding the weakening of the stereo effect.

The diaphragm control circuit provided by the embodiment of the present invention realizes the gain linkage of multiple stereo electro-acoustic conversion units, which not only makes the relative signal amplitudes of the processed multiple channels relatively constant, but also ensures stereo electro-acoustics with poor sound amplitude tolerance. Under the premise that the conversion unit will not be disconnected or burned out, the performance of the stereo electroacoustic conversion unit with strong sound amplitude tolerance is maximized.

The present invention also provides a diaphragm control method, a chip and an electronic device, which are based on the same inventive concept as the above-mentioned diaphragm control circuit, and thus can achieve the same technical effect.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

FIG. 1 is a schematic diagram of a diaphragm control circuit provided by related art 1;

FIG. 2 is a schematic diagram of a diaphragm control circuit provided in related art 2;

FIG. 3 is a schematic diagram of a diaphragm control circuit provided by an embodiment of the present invention;

FIG. 4 is a schematic diagram of another diaphragm control circuit provided by an embodiment of the present invention;

5 is a schematic diagram of a diaphragm control circuit including two stereo electroacoustic conversion units provided by an embodiment of the present invention;

FIG. 6 is a schematic flowchart of a diaphragm control method provided by an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of an electronic device provided by an embodiment of the present invention.

Detailed ways

As mentioned in the background section, when the left and right channels of the two stereo electro-acoustic conversion units in the existing electronic equipment are asymmetrical, the problem of weakening of the sound effect will occur.

The inventors have found that the reason for the above phenomenon is that, for example, the stereo sound of a mobile phone as described in the Background Art section provides left and right sound channels through a speaker located below the mobile phone and an earpiece located above the mobile phone. In the related art, the left and right sound channels provided by the two stereo electroacoustic conversion units of the loudspeaker and the earpiece are processed independently. If there is an airplane flying from the left to the right in the sound source, the sound amplitude of the left sound channel is relatively large at the beginning. , and the sound amplitude of the right channel is small, so that the user can hear the sound of the aircraft on the left, and then the sound amplitude of the left channel gradually decreases, and the sound amplitude of the right channel gradually increases, so that The user hears the sound of the plane on the right side. During the change of the sound amplitude, the result heard by the user is that the plane flies from the left to the right.

However, due to the independent processing of the left and right channels, at the beginning, the signal amplitude of the left channel is large, the DRC module will suppress the signal amplitude of the left channel, and the signal amplitude of the right channel is small, and the DRC module will increase the signal amplitude of the right channel. As a result, the signal amplitudes of the left and right channels are not as large as the difference in the original sound source. Therefore, the final sound of the plane heard is the feeling of flying in the middle. That is to say, in the original sound source, the information reflecting the positioning of the stereo sound field through the amplitude difference between the left and right channels will be weakened by the independent processing of the left and right channel sound effects, and many sounds heard are emitted from the middle. What's more, because the gain processing of the left and right channels is processed independently, some obvious sound positions in the original sound source, such as some drums, etc., because the two gains are processed independently, the left and right channel signals of each drum are relatively The amplitude is changing, making the sound jump around.

As shown in Figure 1 and Figure 2, Figure 1 is a schematic diagram of a diaphragm control circuit provided by related technology 1; Figure 2 is a schematic diagram of a diaphragm control circuit provided by related technology 2; wherein, the diaphragm control circuit in Figure 1 It includes: a first delayer 011 , a first multiplier 012 , a second delayer 021 , a second multiplier 022 , a calculation module 031 and a DRC module 032 . The first delayer 011 and the calculation module 031 in the left channel input signal L (Left input) input circuit, while the second delayer 021 and the calculation module 031 in the right channel input signal R (Right input) input circuit , the calculation module 031 receives the left channel input signal L and the right channel input signal R at the same time, and calculates the two to obtain (L+R)/2, and then as the input signal of the DRC module 032, through the DRC module 032 Modulation, and gain Gain after calculation, and then act on the corresponding input signals in the first multiplier 012 and the second multiplier 022 at the same time, that is, the first multiplier 012 delays the left side of the first delayer 011 The channel input signal L is multiplied by the gain Gain to obtain the left channel output signal L' (Left output), and the second multiplier 022 multiplies the right channel input signal R delayed by the second delayer 021 by the gain Gain Get the right channel output signal R'(Right output).

The diaphragm control circuit in FIG. 2 includes: a first delayer 011 , a first multiplier 012 , a second delayer 021 , a second multiplier 022 , a comparison and selection module 033 and a DRC module 032 . The first delayer 011 and comparison selection module 033 in the left channel input signal L (Left input) input circuit, while the second delayer 021 and comparison selection in the right channel input signal R (Right input) input circuit Module 033, the comparison and selection module 033 simultaneously receives the left channel input signal L and the right channel input signal R, and compares the two, selects the larger value, and then uses it as the input signal of the DRC module 032, through the DRC module 032 modulation, and gain Gain after calculation, and then act on the corresponding input signals in the first multiplier 012 and the second multiplier 022 at the same time, that is, the first multiplier 012 delays the first delayer 011 The left channel input signal L and the gain Gain are multiplied to obtain the left channel output signal L' (Left output), and the second multiplier 022 delays the right channel input signal R and the gain Gain after the second delayer 021 Multiply to get the right channel output signal R'(Right output).

In the above-mentioned related technologies shown in Figure 1 and Figure 2, although the signal adjustment gains of the left and right channels are guaranteed to be consistent, the relative magnitude of the signal amplitudes of the left and right channels will not change, and the left and right channel signals are retained. The amplitude difference reflects the sound field localization information.

That is to say, for an electronic device with symmetrical left and right channel components, the above-mentioned related technologies shown in FIG. 1 and FIG. 2 can avoid the phenomenon that the sound is weakened. However, for the electronic device described in the background art section, such as a mobile phone, the left channel is used to produce sound from the earpiece, and the right channel is used to produce sound from a speaker. As is well known to those skilled in the art, the electrical signal tolerance of the earpiece is relatively weak. If the electrical signal is large, such as a signal with a sound amplitude of 6V and a frequency of 300Hz, it is easy to make the diaphragm of the earpiece exceed the maximum limit given by the electronic equipment factory. Therefore, in order to protect the earpiece, the processing gain of the DRC module for the left channel will be relatively small, but due to the related technologies shown in Figure 1 and Figure 2 above, the gain is synchronized, so it will cause The signal amplitude of the right channel also becomes smaller. The right channel is the speaker, and the voltage tolerance of the speaker is relatively strong. Some signals above 9V are still within the acceptable range of the speaker, and the speaker will not be broken due to overheating. Therefore, the above-mentioned related technologies shown in Figure 1 and Figure 2 do not fully play the role of the speaker, thereby wasting the hardware performance of the speaker, causing users to feel the impact subjectively, such as low volume, insufficient drum sound, and insufficient fullness of the low frequency, etc. question.

Based on this, the present invention provides a diaphragm control circuit, which is applied to an electronic device including N stereo electroacoustic conversion units (the stereo electroacoustic conversion units can be loudspeaker components such as loudspeakers, horns, receivers, etc.), wherein N is an integer, And N is greater than or equal to 2.

Optionally, the sound amplitude tolerance of at least one stereo electroacoustic conversion unit among the plurality of stereo electroacoustic conversion units is different from the sound amplitude tolerance of other stereo electroacoustic conversion units.

Specifically, the diaphragm control circuit includes:

The diaphragm control circuit provided by the present invention is applied in electronic equipment including a plurality of stereo electroacoustic conversion units, and the diaphragm control circuit includes: N input signal transmission circuits, N gain adjustment circuits, comparators and N gain additional circuit; after obtaining the gains of multiple stereo electroacoustic conversion unit branches in the diaphragm control circuit, and then superimposing the preset gain value, the reduced gain value in each circuit is obtained, and based on the reduced gain value, the value in each circuit is taken The minimum value; and then superimpose the corresponding preset gain values based on the minimum value, thereby ensuring that the final gain values in multiple stereo electro-acoustic conversion unit branches are different, so that the stereo electro-acoustic conversion unit gain values with different tolerances are different. Similarly, on the basis of ensuring that the stereo electro-acoustic conversion unit with poor sound amplitude tolerance is not damaged, the performance of other stereo electro-acoustic conversion units with better sound amplitude tolerance is maximized, thus taking into account safety and differences. The characteristics of the stereo electro-acoustic conversion unit with the ability to withstand the sound amplitude avoid the weakening of the stereo effect. The diaphragm control circuit provided by the embodiment of the present invention realizes the gain linkage of multiple stereo electro-acoustic conversion units, which not only makes the relative signal amplitudes of the processed multiple channels relatively constant, but also ensures stereo electro-acoustics with poor sound amplitude tolerance. Under the premise that the conversion unit will not be disconnected or burned out, the performance of the stereo electroacoustic conversion unit with strong sound amplitude tolerance is maximized.

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to FIG. 3. FIG. 3 is a schematic diagram of a diaphragm control circuit provided by an embodiment of the present invention; the diaphragm control circuit is applied to an electronic device including N stereo electroacoustic conversion units 15, where N is an integer, and N is greater than or equal to 2.

Optionally, among the plurality of stereo electro-acoustic conversion units 15 , at least one stereo electro-acoustic conversion unit 15 has a sound amplitude tolerance different from that of other stereo electro-acoustic conversion units 15 .

It should be noted that the number of stereo electroacoustic conversion units is not limited in this embodiment, as long as at least two stereo electroacoustic conversion units are included, and the sound amplitude tolerance of at least one stereo electroacoustic conversion unit is comparable to that of other stereo electroacoustic conversion units. The sound amplitude tolerance of the conversion units may be different. In this embodiment, the number of stereo electro-acoustic conversion units is not limited. It can be two, such as the handset and speaker of a mobile phone, or multiple stereo electroacoustic conversion units. Moreover, among the plurality of stereo electroacoustic conversion units, only one stereo electroacoustic conversion unit may have a sound amplitude tolerance different from that of other stereo electroacoustic conversion units, or the sound amplitude tolerance of multiple stereo electroacoustic conversion units may be different. Capabilities are different, which is not limited in this embodiment.

Please continue to refer to FIG. 3, the diaphragm control circuit includes: N input signal transmission circuits 11, N gain adjustment circuits 12, comparators 13 and N gain additional circuits 14; the Mth input signal transmission circuit 11 and the Mth The gain adjustment circuit 12 is connected, the Mth gain adjustment circuit 12 is connected with the comparator 13, the output end of the comparator 13 is connected with the Mth gain addition circuit 14, the output end of the Mth gain addition circuit 14 is connected with the Mth input signal transmission circuit 11 Connected, M=1, 2, ... N.

That is, in this embodiment, the N input signal transmission circuits have the same structure, the N gain adjustment circuits have the same structure, and the N gain adjustment circuits have the same structure. The detailed structure in each circuit is described below in conjunction with the accompanying drawings.

Wherein, each said gain adjustment circuit 12 is used to receive the corresponding input signal Input, and the input signal Input includes the first input signal Input 1, the second input signal Input 2, ... the Mth input signal Input M ... the Nth Input signal Input N, and calculate initial gain value Gain according to described input signal Input, wherein each branch all obtains corresponding initial gain value (respectively Gain 1, ... Gain M, ... Gain M among Fig. 3 in each branch circuit ...Gain N), and according to the preset gain value Offset (each circuit is respectively Offset 1, ... Offset M, ... Offset N in Fig. 3), the initial gain value Gain is processed to obtain a reduced gain value ;

The comparator 13 receives the N reduced gain values of the N gain adjustment circuits 12, and takes the minimum value after comparison;

Each of the gain additional circuits 14 is used to receive the preset gain value Offset of the corresponding gain adjustment circuit 12 (respectively Offset 1, ... Offset M, ... Offset N in Fig. 3 in each circuit) The above minimum value is processed;

The input signal transmission circuit 11 is used to receive the output signal corresponding to the gain adding circuit 14, and process the corresponding input signal Input to obtain the driving signal corresponding to the stereo electroacoustic conversion unit.

In this embodiment, the diaphragm control circuit is applied in an electronic device including a plurality of stereo electroacoustic conversion units, and the diaphragm control circuit includes: N input signal transmission circuits 11, N gain adjustment circuits 12, comparators 13 and N gain additional circuits 14; after obtaining the gains of multiple stereo electroacoustic conversion unit branches in the diaphragm control circuit, then superimposing the preset gain value to obtain the reduced gain value in each circuit, based on the reduced gain value , take the minimum value in each circuit; then superimpose the corresponding preset gain values based on the minimum value, thus ensuring that the final gain values in multiple stereo electro-acoustic conversion unit branches are different, so that stereo electro-acoustic conversion units with different tolerances The gain values of the sound conversion units are different. On the basis of ensuring that the stereo electro-acoustic conversion units with poor sound amplitude tolerance are not damaged, the performance of other stereo electro-acoustic conversion units with better sound amplitude tolerance is maximized, thereby The characteristics of the stereo electro-acoustic conversion unit taking into account the safety and the ability to withstand different sound amplitudes, avoiding the weakening of the stereo effect. The diaphragm control circuit provided by the embodiment of the present invention realizes the gain linkage of multiple stereo electro-acoustic conversion units, which not only makes the relative signal amplitudes of the processed multiple channels relatively constant, but also ensures stereo electro-acoustics with poor sound amplitude tolerance. Under the premise that the conversion unit will not be disconnected or burned out, the performance of the stereo electroacoustic conversion unit with strong sound amplitude tolerance is maximized.

Optionally, as shown in Figure 3, each input signal transmission circuit 11 includes a multiplier 111, one end of the multiplier 111 is used to receive the input signal Input, the input signal Input includes the first input signal Input 1, the second input signal Input 2, ... Mth input signal Input M ... Nth input signal Input N.

Optionally, as shown in FIG. 3, each gain adjustment circuit 12 includes a dynamic range control module 121 and a first calculation module 122, wherein each dynamic range control module corresponds to its own name DRC as shown in FIG. 3 1. ...DRC M, ...DRC N, the input terminal of the dynamic range control module 121 is used to receive the input signal Input, and calculate the initial gain value Gain according to the input signal Input, wherein each branch obtains a corresponding initial gain value (respectively Gain 1, ... Gain M, ... Gain N in Fig. 3 in each circuit); the input end of the first calculation module 122 is connected with the output end of the dynamic range control module 121, is used for initial gain The value decreases the preset gain value Offset (respectively Offset 1, ... Offset M, ... Offset N in Fig. 3 in each circuit), and the reduced gain value is obtained.

Optionally, as shown in FIG. 3 , the comparator 13 receives N reduced gain values from N gain adjustment circuits, compares them and takes the minimum value.

Optionally, as shown in FIG. 3 , each gain addition circuit 14 includes a second calculation module 140, the input terminal of the second calculation module 140 is connected to the output terminal of the comparator 13, and receives the preset value of the corresponding gain adjustment circuit 12. Set the gain value so that the smaller value increases the preset gain value; the output of the second calculation module 140 is connected with the multiplier 111 in the corresponding input signal transmission circuit 11, and the multiplier 111 combines the input signal Input with the corresponding gain addition circuit The output signals of the second calculation module 140 are multiplied to serve as the driving signal corresponding to the stereo electro-acoustic conversion unit 15 .

It should be noted that the structure of each branch circuit in this embodiment includes the same components, but the parameters involved may be different, for example, the parameters of the dynamic range control module DRC in each branch can be independent If it is set, there is no need to bind multiple audio channels, and the setting of the DRC will not be described in detail in this embodiment.

In addition, the function of the first calculation module 122 in this embodiment is to subtract a certain gain (that is, the preset gain value) from the initial gain to ensure that the subsequent second calculation module 140 increases the preset gain value to form the final gain value, the stereo electro-acoustic conversion unit will not be disconnected or burned because the gain value exceeds the tolerance range of the stereo electro-acoustic conversion unit with the smallest sound amplitude tolerance. Therefore, the role of the first calculation module 122 in this embodiment In order to reduce the initial gain value, the function of the second calculating module 140 is to increase the gain value on the basis of the minimum gain value.

It should be noted that the specific structures of the first calculation module 122 and the second calculation module 140 are not limited in this embodiment. Optionally, when the initial gain value is in the Log domain, the unit is dB. At this time, optional, the first The first calculation module is a subtractor; the second calculation module is an adder. At this time, the corresponding preset gain value is a positive value.

In the same principle, the first calculation module can also be an adder; the second calculation module can also be a subtractor. At this time, the corresponding preset gain value is a negative value.

And when the gain is in the linear domain from the beginning to the end, the corresponding first calculation modules are all dividers; the second calculation modules are all multipliers. At this time, the preset gain value is greater than 1.

In other embodiments, the first calculation modules can also all be multipliers; the second calculation modules can also all be dividers. At this time, the preset gain value is a value less than 1.

In the diaphragm control circuit provided by the embodiment of the present invention, on the basis of the gain generated by the dynamic range control module DRC, a part of the gain value is uniformly lowered to obtain the reduced gain value, and then the reduced gain value of the multiple stereo electroacoustic conversion units The value takes the minimum value; on the basis of the minimum value, the original reduced preset gain is superimposed to ensure the safety of the speaker with the smallest sound amplitude tolerance. At the same time, by adjusting different preset gain values, the final gains of stereo electroacoustic conversion units with different sound amplitude tolerances are different, so that stereo electroacoustic conversion units with different sound amplitude tolerances have different sound amplitudes, making full use of The large-amplitude characteristic of the stereo electro-acoustic conversion unit with strong sound amplitude tolerance makes the stereo effect better and avoids the problem of weakening the stereo effect caused by the same gain of multiple channels.

That is to say, the diaphragm control circuit provided by the embodiment of the present invention realizes the gain linkage of multiple stereo electroacoustic conversion units, which not only makes the relative signal amplitudes of the processed multiple channels relatively constant, but also ensures that the sound amplitude tolerance is poor. Under the premise that the stereo electro-acoustic conversion unit will not be disconnected or burnt out, the performance of the stereo electro-acoustic conversion unit with strong sound amplitude tolerance is brought into play as much as possible.

Please refer to Figure 4, Figure 4 is a schematic diagram of another diaphragm control circuit provided by the embodiment of the present invention; different from the diaphragm control circuit shown in Figure 3, each input signal transmission circuit in this embodiment also includes Delay device 112, for example the first delay device among Fig. 4, ... the M delay device, ... the N delay device; The input end of delay device 112 is used for receiving input signal; The delay device 112 The output end is connected with the input end of the multiplier 111 in the input signal transmission circuit; the extension time of the delayer 112 in all input signal transmission circuits is the same.

The function of the delayer in this embodiment is to delay the input signal, so that the channels of the multiple stereo electro-acoustic conversion units are delayed the same, so that there is no relative delay and phase difference between the multiple output channels. In some application scenarios, the signal needs to be strictly suppressed within a certain range, such as -6dB. When the input signal amplitude is 0dB, to suppress the signal at -6dB, the gain needs to be adjusted, and the gain cannot suddenly jump from 0dB to -6dB. If the gain changes suddenly, pop sounds will be introduced into the final listening experience, which will seriously affect the subjective listening experience, which is unacceptable to customers. Therefore, it takes time to slowly change the gain from 0dB to -6dB without adding a delay device. When the gain has not changed to the corresponding gain, the signal has been sent to the speaker. The amplitude of this signal is above -6dB. is unacceptable. Therefore, a delayer is added, and the length of the delayer corresponds to the time of gain change, so as to ensure that when the signal is multiplied by the gain, the gain has been adjusted to the predetermined gain.

The embodiment of the present invention provides a diaphragm control circuit in which the left channel is an earpiece and the right channel is a speaker. Please refer to FIG. 5 . Schematic diagram of the diaphragm control circuit; the diaphragm control circuit provided by the embodiment of the present invention includes: a first multiplier 51, a second multiplier 52, a first dynamic range control module 53, a second dynamic range control module 54, and a third calculation module 55 , a fourth calculation module 56 , a comparator 57 , a fifth calculation module 58 , and a sixth calculation module 59 .

Wherein, the input terminal of the first dynamic range control module 53 is used for receiving the first input signal Left input, and calculates and obtains the first initial gain value Gain 1 according to the first input signal Left input; The output end of a dynamic range control module 53 is connected, and is used to reduce the first preset gain value Offset 1 by the first initial gain value Gain 1, obtains the first reduced gain value (Gain 1-Offset 1); In the present embodiment, Offset 1 is positive and the gain is in the Log domain.

The input end of the second dynamic range control module 54 is used to receive the second input signal Right input, and calculates and obtains the second initial gain value Gain 2 according to the second input signal Right input; The input end of the fourth calculation module 56 is connected with the second dynamic range The output terminal of the range control module 54 is connected, and is used for superimposing the second initial gain value Gain 2 with the second preset gain value Offset 2 to obtain a second reduced gain value (Gain 2-Offset 2).

The input end of comparator 57 is connected with the 3rd calculation module 55 and the 4th calculation module 56 respectively, compares the first reduction gain value (Gain 1-Offset 1) and the second reduction gain value (Gain 2-Offset 2), and outputs The smaller value Min of the first reduced gain value (Gain 1-Offset 1) and the second reduced gain value (Gain 2-Offset 2).

The input terminal of the fifth calculation module 58 is connected with the output terminal of the comparator, and receives the first preset gain value Offset 1, so that the smaller value Min increases the first preset gain value Offset 1; the output terminal of the fifth calculation module 58 It is connected to the first multiplier 51, and the first multiplier 51 multiplies the first input signal by the output signal of the fifth calculation module 58, and serves as the driving signal Left output of the first stereo electroacoustic conversion unit.

The input terminal of the sixth calculation module 59 is connected with the output terminal of the comparator 57, and receives the second preset gain value, so that the smaller value Min increases the second preset gain value Offset 2; the output terminal of the sixth calculation module 59 and The second multiplier 52 is connected, and the second multiplier 52 multiplies the second input signal by the output signal of the sixth calculation module 59 to serve as the driving signal Right output of the second stereo electroacoustic conversion unit.

In order to make there is no relative delay and phase difference between the left and right channels of the output, a first delayer 510 and a second delayer 511 are also included in this embodiment; the input end of the first delayer 510 is used to receive the first delayer 510 An input signal Left input, and delay the preset time to the first input signal Left input; the output end of the first delayer 510 is connected with the second input end of the first multiplier 51; the input of the second delayer 511 The end is used to receive the second input signal Right input, and delay the second input signal Right input for a preset time; the output end of the second delayer 511 is connected to the second input end of the second multiplier 52 .

Through the function of the delayer, the input signal is delayed to ensure that there is no relative delay between the left and right channels.

This embodiment does not limit the specific structures of the third computing module, the fourth computing module, the fifth computing module, and the sixth computing module. Optionally, in the Log domain, the third computing module and the fourth computing module are both Subtractor; both the fifth calculation module and the sixth calculation module are adders. Or in the linear domain, both the third computing module and the fourth computing module are dividers; the fifth computing module and the sixth computing module are both multipliers.

Through Fig. 5, it can be known that the gap between the L_gain acting on the left channel and the R_gain acting on the right channel is fixed (Offset1-Offset2)dB. Therefore, the relative amplitude of the left and right channel output is constant, not It will change with the amplitude of the input signal of the left and right channels, ensuring the stability of the sound field. In addition, for mobile phone application scenarios where the left channel is the earpiece and the right channel is the speaker, Offset1 can be set to 0dB, and Offset2 can be set to a value greater than 0dB, such as 3dB. In this way, the output of the right channel can be 3dB larger than that of the left channel, and the performance of the right channel speaker will not be limited by the earpiece of the left channel. If the positions of the earpieces and speakers of the left and right channels are interchanged, you can set Offset1 to be greater than 0dB, and Offset2 to be equal to 0dB. The setting values of Offset1 and Offset2 are set according to the difference between the actual earpiece and the speaker, and are not specifically limited in this embodiment of the present invention.

To sum up, the embodiment of the present invention proposes a new gain-linked diaphragm control circuit, which not only makes the relative signal amplitude of the processed L and R relatively constant, but also ensures that the earpiece will not be disconnected or burned out. Under the premise, the performance of the stereo electro-acoustic conversion unit should be brought out as much as possible.

Based on the same inventive concept, please refer to FIG. 6. FIG. 6 is a schematic flow chart of a diaphragm control method provided by an embodiment of the present invention; the diaphragm control method is based on the diaphragm control circuit described in the above embodiment, the diaphragm Membrane control methods include:

S101: Acquire N input signals, where N is an integer, and N is greater than or equal to 2;

S102: Calculate and obtain N initial gain values according to N input signals, and respectively superimpose corresponding preset gain values on the N initial gain values to obtain corresponding N reduced gain values;

S103: Comparing the N reduced gain values, and taking the minimum value;

S104: Based on the minimum value, respectively increase the Mth preset gain value, and multiply it by the Mth input signal as the driving voltage of the Mth stereo electroacoustic conversion unit, M=1, 2, ... N.

For the specific process, please refer to the specific working principle description of the diaphragm control circuit above. Based on the gain generated by the dynamic range control module DRC, first reduce a part of the gain value uniformly to obtain a reduced gain value, and then convert multiple stereo electroacoustics The reduced gain value of the unit takes the minimum value; on the basis of the minimum value, the original reduced preset gain is superimposed to ensure the safety of the stereo electroacoustic conversion unit with the smallest sound amplitude tolerance. At the same time, by adjusting different preset gain values, the final gains of stereo electroacoustic conversion units with different sound amplitude tolerances are different, so that stereo electroacoustic conversion units with different sound amplitude tolerances have different sound amplitudes, making full use of The large-amplitude characteristic of the stereo electro-acoustic conversion unit with strong sound amplitude tolerance makes the stereo effect better and avoids the problem of weakening the stereo effect caused by the same gain of multiple channels. That is to say, the diaphragm control circuit provided by the embodiment of the present invention realizes the gain linkage of multiple stereo electroacoustic conversion units, which not only makes the relative signal amplitudes of the processed multiple channels relatively constant, but also ensures that the sound amplitude tolerance is poor. Under the premise that the stereo electro-acoustic conversion unit will not be disconnected or burnt out, the performance of the stereo electro-acoustic conversion unit with strong sound amplitude tolerance is brought into play as much as possible.

Optionally, in another embodiment of the present invention, based on the minimum value, the Mth preset gain value is increased respectively, and multiplied by the Mth input signal as the driving signal of the Mth stereo electroacoustic conversion unit, M=1, 2, ... N, including:

performing delay processing on the N input signals;

For the specific process, please refer to the specific working principle of the diaphragm control circuit above. The function of delaying the N input signals is to make the same delay for the channels of multiple stereo electroacoustic conversion units, so that the output of multiple channels There is no relative delay and phase difference between them. In some application scenarios, the signal needs to be strictly suppressed within a certain range, such as -6dB. When the input signal amplitude is 0dB, to suppress the signal at -6dB, the gain needs to be adjusted, and the gain cannot suddenly jump from 0dB to -6dB. If the gain changes suddenly, pop sounds will be introduced into the final listening experience, which will seriously affect the subjective listening experience, which is unacceptable to customers. Therefore, it takes time to slowly change the gain from 0dB to -6dB without adding a delay device. When the gain has not changed to the corresponding gain, the signal has been sent to the speaker. The amplitude of this signal is above -6dB. is unacceptable. Therefore, add a delayer, and the length of the delayer corresponds to the time of gain change, so as to ensure that the gain has been adjusted to the predetermined gain when the signal is multiplied by the gain.

In other embodiments of the present invention, a chip is also provided, and the chip includes the diaphragm control circuit described in the above embodiments.

In this embodiment, the chip and the above-mentioned diaphragm control circuit are based on the same inventive concept, so they can achieve the same technical effect.

In other embodiments of the present invention, an electronic device is also provided, please refer to FIG. 7 , which is a schematic structural diagram of an electronic device provided by an embodiment of the present invention. The electronic device 100 can be referred to as shown in FIG. 3 first. The electronic device includes: N stereo electroacoustic conversion units 15, and a diaphragm control circuit, wherein N is an integer, and N is greater than or equal to 2; the diaphragm control circuit 101 It includes N signal input terminals and N signal output terminals; the Mth signal input terminal is used to receive the Mth input signal, M=1, 2, ... N; the Mth signal output terminal is connected to the Mth stereo electroacoustic conversion unit; Wherein, the diaphragm control circuit is the diaphragm control circuit in the above embodiment.

The specific form of the electronic device is not limited in this embodiment, as long as it includes at least one stereo electro-acoustic conversion unit. Specifically, the electronic device in this embodiment can be a mobile phone, a tablet computer or an audio-visual player. For example, as shown in FIG. 7, the electronic device 100 is a mobile phone. Usually, the mobile phone includes two stereo electroacoustic conversion units, that is, here N=2, and the first stereo electroacoustic conversion unit is a receiver L, which can be used as a left channel stereo electroacoustic conversion unit. The conversion unit, the second stereo electroacoustic conversion unit is a speaker R, which can be used as a right channel stereo electroacoustic conversion unit.

The electronic equipment provided by the embodiment of the present invention includes the above-mentioned diaphragm control circuit for multi-channel gain linkage, which realizes the gain linkage of multiple stereo electroacoustic conversion units, which not only makes the relative signals of multiple channels after processing The amplitude is relatively constant, and under the premise of ensuring that the stereo electro-acoustic conversion unit with poor sound amplitude tolerance will not be disconnected or burned out, the performance of the stereo electro-acoustic conversion unit with strong sound amplitude tolerance will be brought out as much as possible.

It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. For the same and similar parts in each embodiment, refer to each other, that is, Can.

It should also be noted that in this article, relational terms such as first and second etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that these entities or operations Any such actual relationship or order exists between. Moreover, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that an article or device comprising a set of elements includes not only those elements but also other elements not expressly listed, Or also include elements inherent in the article or device. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in an article or device comprising the aforementioned element.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

A diaphragm control circuit, characterized in that it is applied to electronic equipment including N stereo electroacoustic conversion units, wherein N is an integer, and N is greater than or equal to 2, and the diaphragm control circuit includes:

N input signal transmission circuits, N gain adjustment circuits, comparators and N gain additional circuits;

The Mth input signal transmission circuit is connected to the Mth gain adjustment circuit, the Mth gain adjustment circuit is connected to the comparator, the output terminal of the comparator is connected to the Mth gain addition circuit, and the Mth gain addition circuit The output terminal is connected to the Mth input signal transmission circuit, M=1, 2, ... N;

Wherein, each of the gain adjustment circuits is used to receive a corresponding input signal, calculate an initial gain value according to the input signal, and process the initial gain value according to a preset gain value to obtain a reduced gain value;

The comparator receives the N reduced gain values of the N gain adjustment circuits, and takes the minimum value after comparison;

Each of the gain addition circuits is used to receive the preset gain value of the corresponding gain adjustment circuit and process the minimum value;

The input signal transmission circuit is used to receive the output signal of the corresponding gain adding circuit, process the corresponding input signal, and obtain the driving signal corresponding to the stereo electroacoustic conversion unit.
The diaphragm control circuit according to claim 1, wherein each input signal transmission circuit includes a multiplier, and one end of the multiplier is used to receive a corresponding input signal.
The diaphragm control circuit according to claim 2, wherein each input signal transmission circuit also includes a delay device;

The input end of the delayer is used to receive the input signal;

The output terminal of the delayer is connected with the input terminal of the multiplier in the input signal transmission circuit;

The extension times of the delayers in all input signal transmission circuits are the same.
The diaphragm control circuit according to claim 1, wherein each gain adjustment circuit includes a dynamic range control module and a first calculation module, the input end of the dynamic range control module is used to receive the input signal, And calculate the initial gain value according to the input signal; the input terminal of the first calculation module is connected to the output terminal of the dynamic range control module, and is used to subtract the preset gain value from the initial gain value value to obtain the reduced gain value.
The diaphragm control circuit according to claim 4, wherein each gain additional circuit includes a second calculation module, the input terminal of the second calculation module is connected to the output terminal of the comparator, and receives the corresponding The preset gain value of the gain adjustment circuit, so that the smaller value increases the preset gain value; the output terminal of the second calculation module is connected to the multiplier in the corresponding input signal transmission circuit, and the multiplier The input signal is multiplied by the output signal of the second calculation module in the corresponding gain addition circuit to obtain a driving signal corresponding to the stereo electroacoustic conversion unit.
The diaphragm control circuit according to claim 4, wherein the first calculation modules are subtracters; the second calculation modules are adders;

Or, the first calculation modules are all adders; the second calculation modules are all subtractors;

Or, the first calculation module is a divider; the second calculation module is a multiplier;

Or, the first calculation modules are all multipliers; the second calculation modules are all dividers.
A diaphragm control method, characterized in that, based on the diaphragm control circuit according to any one of claims 1-6, the diaphragm control method comprises:

Get N input signals, where N is an integer, and N is greater than or equal to 2;

Calculate and obtain N initial gain values according to N input signals, and respectively superimpose corresponding preset gain values on the N initial gain values to obtain corresponding N reduced gain values;

Compare N reduced gain values and take the minimum value;

Based on the minimum value, respectively increase the Mth preset gain value and multiply it with the Mth input signal as the driving signal of the Mth stereo electroacoustic conversion unit, M=1, 2, ... N.
The diaphragm control method according to claim 7, wherein, based on the minimum value, respectively increasing the Mth preset gain value, and multiplying the Mth input signal as the Mth stereo electroacoustic conversion unit Drive signal, M=1, 2, ... N, including:

performing delay processing on the N input signals;

Based on the minimum value, respectively increase the Mth preset gain value, and multiply it with the Mth input signal after delay processing as the driving signal of the Mth stereo electroacoustic conversion unit, M=1, 2, ... N.
A chip, characterized in that the chip includes the diaphragm control circuit according to any one of claims 1-6.
An electronic device, characterized in that it comprises:

N stereo electroacoustic conversion units, and a diaphragm control circuit, where N is an integer, and N is greater than or equal to 2;

The diaphragm control circuit includes N signal input terminals and N signal output terminals;

The Mth signal input terminal is used to receive the Mth input signal, M=1, 2, ... N;

The Mth signal output terminal is connected to the Mth stereo electro-acoustic conversion unit;

Wherein, the diaphragm control circuit is the diaphragm control circuit described in any one of claims 1-6.
The electronic device according to claim 10, wherein the electronic device is a mobile phone, a tablet computer or a video player.
The electronic device according to claim 11, wherein N=2, the first stereo electroacoustic conversion unit is an earpiece, and the second stereo electroacoustic conversion unit is a speaker.