CN106101933B - Method and device for volume adjustment of power amplifier system - Google Patents

Abstract

The invention discloses a volume adjustment method and device for a power amplifier system; the power amplifier system includes a power amplifier module for performing power amplification processing on a received audio signal, a power supply module for providing a working voltage for the power amplifier module, and a volume control signal for outputting. The volume control module of the power amplifier system; wherein, the volume adjustment method of the power amplifier system includes the following steps: detecting whether the volume control module outputs a volume control signal for adjusting the volume value of the power amplifier system; if the volume control signal is detected, then controlling the power supply module to output and volume control Signal matching power supply voltage, so that the volume value of the power amplifier system corresponds to the volume control signal. The technical scheme of the present invention can improve the efficiency of the power amplifier system.

Description

Method and device for volume adjustment of power amplifier system

technical field

The present invention relates to the technical field of audio processing, and in particular, to a volume adjustment method and device of a power amplifier system.

Background technique

The power amplifier system (referred to as the power amplifier system) in the audio equipment includes a power supply, a power amplifier circuit and a volume control module; wherein, the power supply is used to provide a working voltage to the power amplifier circuit, and the power amplifier circuit is used to convert the power (amplitude) of the audio signal. value) to amplify to push the speaker to sound, and the volume control module is used to output the volume control signal.

In the working process of audio equipment, users often adjust the speaker volume according to their personal preferences. The existing volume adjustment device adjusts the speaker volume by adjusting the amplitude of the volume component of the audio signal input to the power amplifier circuit according to the size of the volume control signal.

Although the volume adjusting device can push the speaker to output without distortion at the maximum volume of the audio signal, in the process of decreasing the volume of the audio signal, the output power of the power amplifier circuit will decrease accordingly, while the power supply voltage remains unchanged. In this way, when the volume decreases, the input power of the power amplifier circuit remains unchanged, while the output power decreases, and the efficiency decreases.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide a volume adjustment method of a power amplifier system, aiming at improving the efficiency of the power amplifier system.

In order to achieve the above purpose, the present invention proposes a volume adjustment method for a power amplifier system. The power amplifier system includes a power amplifier module for performing power amplification processing on a received audio signal, and a power supply module for providing the power amplifier module with a working voltage. And a volume control module for outputting a volume control signal; wherein, the volume adjustment method of the power amplifier system comprises the following steps:

Detecting whether the volume control module outputs a volume control signal for adjusting the volume value of the power amplifier system;

If the volume control signal is detected, the power supply module is controlled to output a power supply voltage matching the volume control signal, so that the volume value of the power amplifier system is the volume value adjusted by the volume control signal.

Preferably, the controlling the power supply module to output a power supply voltage matching the volume control signal includes:

Determine whether the volume value adjusted by the volume control signal is within a preset range;

If the volume value adjusted by the volume control signal is within the preset range, the power supply module is controlled to output a power supply voltage corresponding to the adjusted volume value.

Preferably, the power amplifier system further comprises an audio processing module for adjusting the received audio signal according to the received volume control signal; the control of the power supply module to output a power supply matching the volume control signal Voltage also includes:

When the volume value adjusted by the volume control signal is within the preset range, the audio processing module is controlled not to respond to the volume control signal.

Preferably, the controlling the power supply module to output a power supply voltage matching the volume control signal further comprises:

When the volume value adjusted by the volume control signal is not within the preset range and is greater than all values within the preset range, the power supply module is controlled to output the maximum operating voltage corresponding to the power amplifier module, and the The audio processing module responds to the received audio control signal, so that the volume value of the power amplifier system is the volume value adjusted by the volume control signal.

Preferably, the controlling the power supply module to output a power supply voltage matching the volume control signal further comprises:

When the volume value adjusted by the volume control signal is not within the preset range and is less than all values within the preset range, the power supply module is controlled to output the minimum operating voltage corresponding to the power amplifier module, and the The audio processing module responds to the received audio control signal, so that the volume value of the power amplifier system is the volume value adjusted by the volume control signal.

Correspondingly, the present invention also proposes a volume adjustment device for a power amplifier system. The power amplifier system includes a power amplifier module for performing power amplification processing on a received audio signal, a power supply module for providing a working voltage for the power amplifier module, and a power amplifier module. A volume control module for outputting volume control signals; wherein, the volume adjustment device of the power amplifier system includes a detection module and a power supply control module;

The detection module is used to detect whether the volume control module outputs a volume control signal for adjusting the volume value of the power amplifier system;

The power supply control module is used to control the power supply module to output a power supply voltage matching the volume control signal when the volume control signal is detected, so that the volume value of the power amplifier system is the volume control signal The adjusted volume value.

Preferably, the power control module includes a first judgment unit and a first power control unit;

The first judgment unit is used to judge whether the volume value adjusted by the volume control signal is within a preset range;

The first power supply control unit is configured to control the power supply module to output a power supply voltage corresponding to the adjusted volume value when the volume value adjusted by the volume control signal is within the preset range, so as to The volume value of the power amplifier system is set to the volume value adjusted by the volume control signal.

Preferably, the power amplifier system further includes an audio processing module for adjusting the received audio signal according to the received volume control signal; the power control module further includes a switch control unit;

The switch control unit is configured to control the audio processing module not to respond to the received volume control signal when the volume value adjusted by the volume control signal is within the preset range; When the adjusted volume value is not within the preset range, the audio processing module is controlled to respond to the received volume control signal, so that the volume value of the power amplifier system is the volume value adjusted by the volume control signal.

Preferably, the power control module further includes a second power control unit and a third power control unit;

The second power supply control unit is configured to control the power supply module to output corresponding to the power amplifier module when the detection value corresponding to the detection signal is not within the preset range and is greater than all values within the preset range the maximum working voltage;

The third power supply control unit is configured to control the power supply module to output corresponding to the power amplifier module when the detection value corresponding to the detection signal is not within the preset range and less than all values within the preset range the minimum operating voltage.

The technical scheme of the present invention realizes the adjustment of the loudspeaker volume by controlling the power supply module in the power amplifier system to output the corresponding power supply voltage according to the magnitude of the volume control signal. When the volume value adjusted by the volume control signal decreases, the situation of “the input power of the power amplifier circuit remains unchanged, but the output power decreases” occurs due to the use of the prior art solution. The input power is reduced, and the output power is also reduced”. Therefore, compared with the prior art, the technical solution of the present invention improves the efficiency of the power amplifier system.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying 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 These are some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can also be obtained according to the structures shown in these drawings without creative efforts.

1 is a schematic flowchart of an embodiment of a volume adjustment method for a power amplifier system of the present invention;

2 is a schematic flowchart of another embodiment of a volume adjustment method for a power amplifier system of the present invention;

3 is a schematic diagram of functional modules of an embodiment of a volume adjustment device for a power amplifier system of the present invention;

FIG. 4 is a schematic diagram of functional modules of an embodiment of the power control module in FIG. 3 .

The realization, functional characteristics and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The invention provides a volume adjustment method of a power amplifier system. The power amplifier system includes a power amplifier module for performing power amplification processing on the received audio signal, a power supply module for providing a working voltage for the power amplifier module, and a volume control module for outputting a volume control signal.

In one embodiment, the volume adjustment method of the power amplifier system includes:

S100, detecting whether the volume control module outputs a volume control signal for adjusting the volume value of the power amplifier system;

It should be noted that the volume control module may be a knob or a remote control or the like. When the volume control module is an adjustable knob, the volume value corresponding to the volume control signal is continuous. When the volume control module is a remote control, the volume value corresponding to the volume control signal can be continuous or discontinuous. There is no restriction on the way of changing the volume value corresponding to the volume control signal.

S200, if the volume control signal is detected, the power supply module is controlled to output a power supply voltage matching the volume control signal, so that the volume value of the power amplifier system is the volume value adjusted by the volume control signal.

The size of the power supply voltage output by the power supply module can be changed by controlling the duty ratio of the power supply voltage output by the power supply module; the power supply voltage of the power amplifier module can also be changed by controlling the voltage division value of the power amplifier module, which is not limited here.

When the volume control module outputs the volume control signal, the size of the volume value adjusted by the volume control signal output by the volume control module is detected. Then, the magnitude of the power supply voltage output by the power supply module is controlled according to the size of the volume value adjusted by the volume control signal, so that the power amplification factor of the power amplifier module matches the volume value corresponding to the volume control signal, so as to achieve the purpose of adjusting the volume of the power amplifier system. It is worth mentioning that in the process of changing the volume value adjusted by the volume control signal from small to large, the power supply voltage output by the power module increases accordingly; in the process of changing the volume value adjusted by the volume control signal from large to small, The power supply voltage output by the power supply module is correspondingly reduced.

The technical scheme of the present invention realizes the adjustment of the speaker volume by controlling the power supply module in the power amplifier system to output a corresponding power supply voltage according to the volume value adjusted by the volume control signal. When the volume value adjusted by the volume control signal is reduced, the situation of "the input power of the power amplifier circuit remains unchanged, but the output power is reduced" occurs due to the use of the prior art. The input power is reduced, and the output power is also reduced”. Therefore, compared with the prior art, the technical solution of the present invention improves the efficiency of the power amplifier system.

In a preferred embodiment, controlling the power supply module to output a power supply voltage matching the volume control signal includes:

S210, determine whether the volume value adjusted by the volume control signal is within a preset range;

The volume value adjusted by the volume control signal may be continuous or discrete.

If the volume value adjusted by the volume control signal is continuous, the first volume threshold and the second volume threshold may be preset. When it is detected that the volume value adjusted by the volume control signal is between the first volume threshold and the second volume threshold, it means that the volume value adjusted by the current volume control signal is within the preset range; when it is detected that the volume adjusted by the volume control signal When the volume value is not between the first threshold and the second threshold, it means that the volume value adjusted by the current volume control signal is not within the preset range. The first volume threshold is the maximum volume value within the preset range, and the second volume threshold is the minimum volume value within the preset range.

If the volume value adjusted by the volume control signal is discrete, a volume value table may be preset. When the volume value adjusted by the detected volume control signal can be found in the volume value table, it means that the volume value adjusted by the current volume control signal is within the preset range; when the detected volume value adjusted by the volume control signal If it cannot be found in the volume value table, it means that the volume value adjusted by the current volume control signal is not within the preset range.

S220, if the volume value adjusted by the volume control signal is within a preset range, control the power supply module to output a power supply voltage corresponding to the adjusted volume value.

When judging the volume value adjusted by the current volume control signal, it can be determined whether the volume value adjusted by the current volume control signal can be determined by checking whether there is a preset volume value that is the same or similar to the volume value adjusted by the current volume control signal. within the preset range. It is also possible to judge whether the volume value adjusted by the current volume control signal is within the preset range by comparing the volume value adjusted by the current volume control signal with the upper and lower limit values of the preset volume value, which is not done here. limit.

It can be understood that, on the one hand, in the process of reducing the volume value adjusted by the volume control signal, the power supply voltage output by the power supply module is correspondingly reduced. When the volume value adjusted by the volume control signal is reduced to a certain extent, the power supply The power supply voltage output by the module may not be able to turn on the power amplifier module. On the other hand, in the process of increasing the volume value adjusted by the volume control signal, the power supply voltage output by the power supply module increases accordingly. When the volume value adjusted by the volume control signal increases to the maximum value, the power amplification of the power amplifier module maximum multiple. However, since the audio signal input to the power amplifier module has not been amplified before, the volume value output by the power amplifier module under this condition is smaller than the volume value adjusted by the current volume control signal.

Therefore, it is determined whether the volume value adjusted by the volume control signal is within the preset range; and when the volume value adjusted by the volume control signal is within the preset range, the power supply module is controlled to output a power supply voltage of a corresponding magnitude, which can avoid the power supply control module Responding to a volume control signal that is too small or too large, so as to avoid malfunctions in the process of adjusting the volume of the power amplifier system.

Further, the power amplifier system also includes an audio processing module for adjusting the received audio signal according to the received volume control signal; the above-mentioned control power module outputting a power supply voltage matching the volume control signal also includes:

S250, when the volume value adjusted by the volume control signal is within a preset range, control the audio processing module not to respond to the received volume control signal.

It can be understood that when the volume value adjusted by the volume control signal is within the preset range, it means that the output volume value of the power amplifier system can be adjusted by controlling the power supply module to output a power supply voltage matching the volume control signal. At this time, if the audio processing module is controlled to respond to the received volume control signal, it will not only lead to waste of electric power, but also cause disordered adjustment of the volume value of the amplifier system.

In a preferred embodiment, the above-mentioned control power module outputting a power supply voltage matching the volume control signal further includes:

S260, when the volume value adjusted by the volume control signal is not within the preset range and is greater than all values within the preset range, control the power supply module to output the maximum working voltage of the corresponding supplier module, and control the audio processing module to respond to the received audio control signal, so that the volume value of the power amplifier system is the volume value adjusted by the volume control signal.

When the detection value corresponding to the detection signal is not within the preset range and is greater than all values within the preset range, it means that the volume value corresponding to the volume control signal is larger, and the power amplification factor required by the power amplifier module is also larger. When the output of the control power supply module corresponds to the maximum working voltage of the power amplifier module, the power amplification factor of the power amplifier module is the largest, which meets the system requirements.

In a preferred embodiment, the above-mentioned control power module outputting a power supply voltage matching the volume control signal further includes:

S270, when the volume value adjusted by the volume control signal is not within the preset range and less than all values within the preset range, control the power supply module to output the minimum operating voltage of the corresponding power amplifier module, and control the audio processing module to respond to the received audio control signal , so that the volume value of the power amplifier system is the volume value adjusted by the volume control signal.

When the detection value corresponding to the detection signal is not within the preset range and is smaller than all values within the preset range, it means that the volume value corresponding to the volume control signal is small, and the power amplification factor required by the power amplifier module is also small. When the power supply module is controlled to output the minimum operating voltage corresponding to the power amplifier module, the power amplification factor of the power amplifier module is the smallest, and it can work stably to meet the needs of the system.

That is to say, when the volume value adjusted by the volume control signal is greater than all the volume values within the preset range, the power supply module is controlled to output the maximum working voltage of the corresponding power amplifier module. At the same time, the audio processing module is adjusted according to the current volume control signal. The volume value of the input audio signal is adjusted correspondingly, so that the volume of the speaker corresponds to the volume value adjusted by the volume control signal. When the volume value adjusted by the volume control signal is less than all the values in the preset range, the power supply module is controlled to output the minimum operating voltage of the corresponding power amplifier module. The audio signal is adjusted accordingly, so that the volume of the speaker corresponds to the volume value adjusted by the volume control signal. In this way, for each volume control signal, the power amplifier system can output a volume value corresponding to the volume value adjusted by the volume control signal, so as to achieve the purpose of adjusting the output volume. And in the whole adjustment process, compared with the prior art, the efficiency of the power amplifier system is improved.

The present invention also provides a volume adjustment device of the power amplifier system. The power amplifier system includes a power amplifier module for performing power amplification processing on the received audio signal, a power supply module for providing a working voltage for the power amplifier module, and a volume control module for outputting a volume control signal.

In one embodiment, the volume adjustment device of the power amplifier system includes a detection module 100 and a power supply control module 200; wherein the detection module 100 is used to detect whether the volume control module outputs a volume control signal for adjusting the volume value of the power amplifier system; the power supply The control module 200 is configured to control the power supply module to output a power supply voltage matching the volume control signal when the volume control signal is detected, so that the volume value of the power amplifier system is the volume value adjusted by the volume control signal.

It should be noted that the volume control module may be a knob or a remote control or the like. When the volume control module is an adjustable knob, the volume value adjusted by the volume control signal is continuous. When the volume control module is a remote control, the volume value adjusted by the volume control signal can be continuous or discrete. There is no restriction on the way of changing the volume value adjusted by the volume control signal. The detection module 100 may include a comparison table, where the comparison table stores a preset volume value corresponding to the volume value adjusted by the volume control signal. The power supply control module 200 may include a PWM controller to change the size of the power supply voltage output by the power supply module by controlling the duty cycle of the power supply voltage output by the power supply module; it may also include a voltage divider, which forms a voltage divider with the power amplifier module In the circuit, for the volume value adjusted by each volume control signal, the voltage divider will obtain a corresponding power supply voltage, thereby changing the power supply voltage of the power amplifier module, which is not limited here.

When the detection module 100 detects that the volume control module outputs a volume control signal, the power control module 200 makes corresponding adjustments to the power supply voltage according to the volume value adjusted by the current volume control signal, so that the power amplification factor of the power amplifier module is equal to the current volume control signal The adjusted volume value corresponds to the purpose of volume adjustment of the power amplifier system. It is worth mentioning that in the process of changing the volume value adjusted by the volume control signal from small to large, the power supply voltage output by the power module increases accordingly; in the process of changing the volume value adjusted by the volume control signal from large to small, The power supply voltage output by the power supply module is correspondingly reduced.

The technical scheme of the present invention realizes the adjustment of the speaker volume by controlling the power supply module in the power amplifier system to output a corresponding power supply voltage according to the volume value adjusted by the volume control signal. When the volume value adjusted by the volume control signal is reduced, the situation of "the input power of the power amplifier circuit remains unchanged, but the output power is reduced" occurs due to the use of the prior art. The input power is reduced, and the output power is also reduced”. Therefore, compared with the prior art, the technical solution of the present invention improves the efficiency of the power amplifier system.

In a preferred embodiment, the above-mentioned power supply control module 200 includes a first determination unit 210 and a first power supply control unit 220; wherein, the first determination unit 210 is used to determine whether the volume value adjusted by the volume control signal is within a preset range. The first power control unit 220 is configured to control the power module to output a power supply voltage corresponding to the volume value adjusted by the volume control signal when the volume value adjusted by the volume control signal is within a preset range.

It should be noted that the first judging unit 210 may include a detection table, and the detection table stores preset values of detection values corresponding to the detection signals. When the first determination unit 210 is in the working state, if there is a preset volume value in the detection table that is the same as or similar to the detection value of the volume value adjusted by the current volume control signal, then determine the volume value adjusted by the current volume control signal within the preset range. The first judging unit 210 may also include a comparator. When the first judging unit 210 is in the working state, if the volume value adjusted by the current volume control signal is greater than the lower limit value of the comparator and less than the upper limit value of the comparator, then It is judged that the volume value adjusted by the current volume control signal is within the preset range.

When the volume control module outputs a volume control signal, the first determination unit 210 determines whether the volume value adjusted by the current volume control signal is within the preset range, and if the volume value adjusted by the current volume control signal is within the preset range, then The first power control unit 220 controls the power module to output a power voltage matching the current volume control signal.

It can be understood that, on the one hand, in the process of reducing the volume value adjusted by the volume control signal, the power supply voltage output by the power control module 200 controlled by the power supply module is correspondingly reduced. When the volume value adjusted by the volume control signal is reduced to To a certain extent, the power supply voltage output by the power module may not be able to turn on the power amplifier module. On the other hand, in the process of increasing the volume value adjusted by the volume control signal, the power supply control module 200 controls the power supply voltage output by the power module to increase accordingly. When the volume value adjusted by the volume control signal increases to the maximum value, The power amplification of the power amplifier module is the largest. However, since the audio signal input to the power amplifier module has not been amplified before, the volume output by the power amplifier module under this condition is lower than the volume value corresponding to the preset volume control signal.

Therefore, setting the first judgment unit 210 and the first power control unit 220 can prevent the power control module 200 from responding to the volume value adjusted by the volume control signal that is too small or too large, thereby avoiding the process of adjusting the volume of the power amplifier system. , an error occurred.

In a preferred embodiment, the above-mentioned power amplifier system further includes an audio processing module for adjusting the received audio signal according to the received volume control signal; the power control module further includes a switch control unit 250;

The switch control unit 250 is used to control the audio processing module not to respond to the received volume control signal when the volume adjusted by the volume control signal is within the preset range; when the volume value adjusted by the volume control signal is not within the preset range, The audio processing module is controlled to respond to the received volume control signal, so that the volume value of the power amplifier system is the volume value adjusted by the volume control signal.

It can be understood that when the volume value adjusted by the volume control signal is within the preset range, it means that the output volume value of the power amplifier system can be adjusted by controlling the power supply module to output a power supply voltage matching the volume control signal. At this time, if the audio processing module is controlled to respond to the received volume control signal, it will not only lead to waste of electric power, but also cause disordered adjustment of the volume value of the amplifier system.

When the volume value adjusted by the volume control signal is not within the preset range, it means that the output volume value of the power amplifier system cannot be adjusted by controlling the power supply module to output a power supply voltage that matches the volume control signal. At this time, the audio processing module is controlled to respond to the received volume control signal, so as to realize the adjustment of the output volume value of the supplier system.

In a preferred embodiment, the power control module 200 further includes a second power control unit 260 and a third power control unit 270; wherein, the second power control unit 260 is used for when the detection value corresponding to the detection signal is not within the preset range When the detection value corresponding to the detection signal is not within the preset range and is smaller than the preset value, the third power supply control unit 270 When all values within the range are set, the control power supply module outputs the minimum working voltage of the corresponding power amplifier module.

It should be noted that, the second power control unit 260 and/or the third power control unit 270 may be a voltage divider, a PWM controller, etc., which are not limited here. In addition, when processing the detection value corresponding to the detection signal that is not within the preset range, it is also necessary to determine whether the detection value corresponding to the current detection signal is greater than all values within the preset range or less than all values within the preset range. Therefore, in this embodiment, the first determination unit 210 is further configured to determine whether the detection value of the detection signal is greater than all preset values, or is further configured to determine whether the detection value of the detection signal is less than all preset values, which is not limited here. .

That is to say, when the volume value adjusted by the volume control signal is greater than all values within the preset range, the second power supply control unit 260 controls the power supply module to output the maximum operating voltage of the corresponding power amplifier module. The volume control signal adjusts the input audio signal correspondingly, so that the volume of the speaker corresponds to the volume value corresponding to the volume control signal. When the volume value adjusted by the volume control signal is smaller than all values within the preset range, the third power supply control unit 270 controls the power supply module to output the minimum operating voltage of the corresponding power amplifier module. The input audio signal is adjusted accordingly, so that the volume of the speaker corresponds to the volume value corresponding to the volume control signal. In this way, for each volume control signal, the volume adjustment of the power amplifier system can be realized. And in the whole adjustment process, compared with the prior art, the efficiency of the power amplifier system is improved.

The above descriptions are only the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Under the inventive concept of the present invention, the equivalent structural transformations made by the contents of the description and drawings of the present invention, or the direct/indirect application Other related technical fields are included in the scope of patent protection of the present invention.

Claims (4)

1. A power amplifier system comprises a power amplifier module for performing power amplification processing on a received audio signal, a power module for providing working voltage for the power amplifier module and a volume control module for outputting a volume control signal; the power amplifier system is characterized by further comprising an audio processing module for adjusting the received audio signal according to the received volume control signal; the method comprises the following steps:

detecting whether the volume control module outputs a volume control signal for adjusting the volume value of the power amplification system or not;

if the volume control signal is detected, controlling the power supply module to output a power supply voltage matched with the volume control signal so as to enable the volume value of the power amplification system to be the volume value regulated by the volume control signal,

wherein the controlling the power module to output a power voltage matched with the volume control signal comprises:

judging whether the volume value adjusted by the volume control signal is within a preset range;

if the volume value adjusted by the volume control signal is within the preset range, controlling the power supply module to output a power supply voltage corresponding to the adjusted volume value;

when the volume value adjusted by the volume control signal is not in a preset range and is larger than all values in the preset range, controlling the power supply module to output the maximum working voltage corresponding to the power amplification module, and controlling the audio processing module to respond to the received volume control signal so as to enable the volume value of the power amplification system to be the volume value adjusted by the volume control signal;

and when the volume value adjusted by the volume control signal is not in a preset range and is smaller than all values in the preset range, controlling the power supply module to output the minimum working voltage corresponding to the power amplification module, and controlling the audio processing module to respond to the received volume control signal so as to enable the volume value of the power amplification system to be the volume value adjusted by the volume control signal.

2. The method for adjusting the volume of a power amplifier system according to claim 1, wherein the controlling the power module to output the power voltage matched with the volume control signal further comprises:

and when the volume value adjusted by the volume control signal is within the preset range, controlling the audio processing module not to respond to the received volume control signal.

3. A volume adjusting device of a power amplifier system comprises a power amplifier module for carrying out power amplification processing on received audio signals, a power supply module for providing working voltage for the power amplifier module and a volume control module for outputting volume control signals; the volume adjusting device of the power amplification system is characterized by comprising a detection module and a power supply control module;

the detection module is used for detecting whether the volume control module outputs a volume control signal for adjusting the volume value of the power amplification system or not;

the power supply control module is used for controlling the power supply module to output power supply voltage matched with the volume control signal when the volume control signal is detected, so that the volume value of the power amplification system is the volume value regulated by the volume control signal;

the power supply control module comprises a first judgment unit, a first power supply control unit and a second power supply control unit;

the first judging unit is used for judging whether the volume value adjusted by the volume control signal is within a preset range;

the first power supply control unit is used for controlling the power supply module to output power supply voltage corresponding to the volume value adjusted by the volume control signal when the volume value adjusted by the volume control signal is within the preset range;

the second power supply control unit is used for controlling the power supply module to output the maximum working voltage corresponding to the power amplification module when the volume value adjusted by the volume control signal is not in the preset range and is greater than all values in the preset range;

the power amplifier system also comprises an audio processing module used for adjusting the received audio signal according to the received volume control signal; the power supply control module also comprises a switch control unit;

the switch control unit is used for controlling the audio processing module to respond to the received volume control signal when the volume value adjusted by the volume control signal is not in the preset range, so that the volume value of the power amplification system is the volume value adjusted by the volume control signal;

the power supply control module further comprises a second power supply control unit and a third power supply control unit;

the second power supply control unit is used for controlling the power supply module to output the maximum working voltage corresponding to the power amplification module when the volume value adjusted by the volume control signal is not in the preset range and is greater than all values in the preset range;

and the third power supply control unit is used for controlling the power supply module to output the minimum working voltage corresponding to the power amplifier module when the volume value adjusted by the volume control signal is not in the preset range and is smaller than all values in the preset range.

4. The volume adjusting device of a power amplifier system of claim 3,

and the switch control unit is used for controlling the audio processing module not to respond to the received volume control signal when the volume value adjusted by the volume control signal is within the preset range.

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