Power-on pop noise elimination method, apparatus and system for audio processor

Abstract

The present application discloses a power-on pop noise elimination method, apparatus and system for an audio processor. The method comprises: measuring the power-on time of each sub-module in an audio processing circuit; on the basis of the power-on time of each sub-module and preset turn-on time levels, measuring an impulse voltage at an output end of the audio processing circuit to obtain an optimal power-on control signal arrangement scheme set; and on the basis of the optimal power-on control signal arrangement scheme set, adjusting the frequency of a power-on control signal sent to each sub-module, so as to eliminate pop noise generated when the audio processing circuit is powered on. According to the present application, the impulse voltage is reduced by adjusting the power-on time of an audio processor, thereby effectively eliminating pop noise generated when the audio processor is powered on.

Description

Method, device and system for eliminating power-on impact sound for audio processor TECHNICAL FIELD

[0001] The application belongs to the technical field of electronics, and particularly relates to a method, device and system for eliminating power-on impact sound for an audio processor. BACKGROUND

[0002] An audio processor is an audio processing device that is often used when many large electronic devices are used, and can help an operator control music or a musical score to produce different sound effects in different scenes. The internal structure of the audio processor is generally composed of an input part and an output part, and is responsible for playing after processing the input digital signal. However, when the audio processor is turned on, abnormal noise, i.e., power-on impact sound, is often generated, which greatly affects the user experience, especially in a quiet or night environment.

[0003] Now, the power-on impact sound is often eliminated by manually debugging the audio processor, but the debugging process is relatively cumbersome, and as the components of the audio processor age and the mechanical parameters are unstable, how to eliminate the impact sound caused by power-on will be more complex, which invisibly increases the labor cost of debugging. SUMMARY

[0004] The application provides a method, device and system for eliminating power-on impact sound for an audio processor, which adjusts the power-on time of the audio processor to reduce the impact voltage and effectively eliminate the impact sound of the audio processor when powered on.

[0005] A first aspect of the application provides a method and circuit for eliminating power-on impact sound for an audio processor, and the method comprises:

[0006] Measuring the power-on time of each sub-module in the audio processing circuit;

[0007] According to the power-on time of each sub-module and a preset conduction time level, measuring the impact voltage of the output end of the audio processing circuit to obtain a set of optimal power-on control signal arrangement schemes;

[0008] According to the set of optimal power-on control signal arrangement schemes, adjusting the frequency of the power-on control signal sent to each sub-module to eliminate the impact sound of the audio processing circuit when powered on.

[0009] The above scheme first determines the power-on time of the sub-modules of the audio processing module, and provides data support for subsequent research on the impact sound caused by the change of the power-on time; then, the pre-set conduction time level sets the power-on time of the sub-modules, measures the impact voltage under each power-on time, and measures the size of the impact sound according to the amplitude of the impact voltage, to obtain the optimal power-on control signal arrangement scheme set that makes the audio processor power on without impact sound; finally, according to the optimal power-on control signal arrangement scheme set, the power-on time of each sub-module is arranged by setting the frequency of the power-on control signal, so as to effectively eliminate the impact sound of the audio processor when it is powered on.

[0010] In a possible implementation method of the first aspect, the power-on time of each sub-module in the audio processing circuit is measured, specifically:

[0011] The first reference voltage of each sub-module is set through a first measurement circuit, and the second reference voltage of each sub-module is set through a second measurement circuit; wherein the first measurement circuit includes a plurality of first comparators, and the second measurement circuit includes a plurality of second comparators; each sub-module corresponds to one first comparator and one second comparator;

[0012] According to the first reference voltage and the second reference voltage, each sub-module in the audio processing circuit is driven to perform the operation of the conduction circuit at the same time, to obtain the power-on time of each sub-module.

[0013] In a possible implementation method of the first aspect, according to the first reference voltage and the second reference voltage, each sub-module in the audio processing circuit is driven to perform the operation of the conduction circuit at the same time, to obtain the power-on time of each sub-module, specifically:

[0014] Each sub-module in the audio processing circuit is driven to perform the operation of the conduction circuit at the same time, and each first comparator and each second comparator are measured;

[0015] When the first comparator reaches the first reference voltage, the first time of the corresponding sub-module is obtained;

[0016] When the second comparator reaches the second reference voltage, the second time of the corresponding sub-module is obtained;

[0017] According to the difference between the first time and the second time of each sub-module, the power-on time of each sub-module is obtained.

[0018] In a possible implementation method of the first aspect, according to the power-on time of each sub-module and the pre-set conduction time level, the impact voltage of the output end of the audio processing circuit is measured, to obtain the optimal power-on control signal arrangement scheme set, specifically:

[0019] According to the power-on time of each sub-module and a preset conduction time level, a plurality of power-on control signal arrangement schemes are generated;

[0020] According to each power-on control signal arrangement scheme, a detection signal is sent to each sub-module, and the impulse voltage of the output end is measured to obtain an average impulse voltage of each power-on control signal arrangement scheme;

[0021] The power-on control signal arrangement scheme with the average impulse voltage less than the first threshold value is added to the optimal power-on control signal arrangement scheme set.

[0022] The above scheme tests the sub-modules of the audio processing module through different power-on control signal arrangement schemes, detects whether the impulse voltage generated by each sub-module during power-on exceeds a set threshold value, and when the threshold value is exceeded, it is considered that the scheme will cause a large impact sound; when the threshold value is not exceeded, it is considered that the scheme will not cause an impact sound, and can be used as an optimal power-on control signal arrangement scheme to control the power-on of the audio processor.

[0023] In a possible implementation method of the first aspect, according to the power-on time and a preset conduction time level, a plurality of power-on control signal arrangement schemes are generated, specifically:

[0024] The conduction time level is divided into a second threshold value of levels, and the power-on time set for different levels is different;

[0025] According to the power-on time of each sub-module, a corresponding conduction time level is selected for each sub-module;

[0026] According to the conduction time level of each sub-module, a plurality of power-on control signal arrangement schemes are generated for the audio processing circuit; in each power-on control signal arrangement scheme, the conduction time levels of any two sub-modules are different.

[0027] The above scheme generates a plurality of power-on control signal arrangement schemes by setting the time level of the circuit conduction of the sub-modules, and the conduction time of the sub-modules in each scheme is different, fully considering the conduction time of each sub-module, and providing sufficient data support for screening the optimal power-on control signal arrangement scheme that will not produce impact sound.

[0028] In a possible implementation method of the first aspect, according to each power-on control signal arrangement scheme, a detection signal is sent to each sub-module, and the impulse voltage of the output end is measured to obtain an average impulse voltage of each power-on control signal arrangement scheme, specifically:

[0029] According to each power-on control signal arrangement scheme, the frequency of the detection signal corresponding to each sub-module is set, and then the third threshold value times of the corresponding detection signal are sent to each sub-module;

[0030] After sending the detection signal, the impulse voltage of the output end under each power-on control signal arrangement scheme is measured and averaged to obtain the average impulse voltage of each power-on control signal arrangement scheme.

[0031] The second aspect of the application provides an audio processor-oriented device for eliminating power-on impact sound, which comprises a power-on time measurement module, an impulse voltage measurement module and a power-on control signal optimization module.

[0032] The power-on time measurement module is configured to measure the power-on time of each sub-module in the audio processing circuit.

[0033] The impulse voltage measurement module is configured to measure the impulse voltage of the output end of the audio processing circuit according to the power-on time of each sub-module and a preset conduction time level, to obtain a set of optimal power-on control signal arrangement schemes.

[0034] The power-on control signal optimization module is configured to adjust the frequency of the power-on control signal sent to each sub-module according to the set of optimal power-on control signal arrangement schemes, to eliminate the impact sound when the audio processing circuit is powered on.

[0035] The third aspect of the application provides an audio processor-oriented system for eliminating power-on impact sound, which comprises a microprocessor, an audio processing circuit, a first measurement circuit and a second measurement circuit.

[0036] The microprocessor is configured to execute the audio processor-oriented method for eliminating power-on impact sound according to any one of claims 1 to 6.

[0037] The audio processing circuit is configured to receive the signal sent by the microprocessor.

[0038] The first measurement circuit is configured to measure the first reference voltage of the sub-module in the audio processing circuit.

[0039] The second measurement circuit is configured to measure the second reference voltage of the sub-module in the audio processing circuit.

[0040] The microprocessor is connected to the audio processing circuit, the first measurement circuit and the second measurement circuit respectively; and the audio processing circuit is connected to the first measurement circuit and the second measurement circuit respectively.

[0041] In a possible implementation method of the third aspect, the audio processing circuit comprises a first amplifier, an ADC module, a DSP audio processing module, a DAC module, a second amplifier and an output end.

[0042] The second amplifier is connected to the output end.

[0043] The output terminal is used for detecting voltage variation of the second amplifier, and obtaining the impulse voltage of the output terminal.

[0044] In a possible implementation method of the third aspect, the first measurement circuit includes a plurality of first comparators, each of which is connected with two first adjustable resistors used for setting a first reference voltage; and the second measurement circuit includes a plurality of second comparators, each of which is connected with two second adjustable resistors used for setting a second reference voltage. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the present application, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0046] FIG. 1 is a specific flowchart of a method for eliminating power-on impulse sound for an audio processor according to an embodiment of the present application;

[0047] FIG. 2 is a structural diagram of an apparatus for eliminating power-on impulse sound for an audio processor according to an embodiment of the present application;

[0048] FIG. 3 is a structural diagram of a system for eliminating power-on impulse sound for an audio processor according to an embodiment of the present application. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort fall within the scope of protection of the present application.

[0050] It should be understood that the step numbers used herein are only for the convenience of description, and are not limited to the execution sequence of the steps.

[0051] First Embodiment

[0052] Because the environmental change will bring the power-on time change to each sub-module in the audio processing circuit, the voltage is unstable and the impact sound is generated, which affects the playing sound quality of the audio processor, therefore, how to adaptively adjust the power-on time of the sub-module according to the environmental change to avoid the generation of the impact voltage is one of the problems researched by the embodiments of the present application. Moreover, compared with the manual debugging, the power-on time of the sub-module is adaptively adjusted, which saves more human cost.

[0053] As shown in FIG. 1, FIG. 1 is a specific flowchart of an audio processor-oriented method for eliminating power-on impact sound provided by an embodiment of the present application, the audio processor-oriented method for eliminating power-on impact sound of the embodiment includes steps S1 to S3, which are described in detail as follows.

[0054] Step S1, measuring the power-on time of each sub-module in the audio processing circuit.

[0055] In the embodiment of the present application, when the audio processor is started, the signal disconnecting module is first controlled to be disconnected, so that each module in the audio processing circuit is not powered on. The audio processor includes a signal input module, an audio processing circuit, a signal disconnecting module and a signal output module. When the audio processing circuit is powered on, impact sound will occur due to the existence of a large impact voltage, therefore, in the embodiment of the present application, the measurement of the power-on time of the sub-modules in the audio processing circuit and the corresponding improvement are needed to avoid the formation of a large impact voltage when the audio processor is started.

[0056] Because each sub-module is powered by its own separate power supply, when powered on at the same time, the power-on time will be different due to the different power-on rates of each power supply.

[0057] The power-on time of each sub-module is measured by the first measurement circuit and the second measurement circuit.

[0058] For better illustration, there are several first comparators in the first measurement circuit, each first comparator is set with a reference voltage by two adjustable resistors, and each first comparator is used to measure a sub-module. There are several second comparators in the second measurement circuit, each second comparator is set with a reference voltage by two adjustable resistors, and each second comparator is used to measure a sub-module.

[0059] The first reference voltage of the first comparator is set by setting the resistance ratio of the two adjustable resistors. Similarly, the second reference voltage of the second comparator is also set in this way. The first reference voltage and the second reference voltage are both related to the standard power supply voltage of the corresponding sub-module to be measured.

[0060] Optionally, in the embodiment of the present application, the resistance ratio of the two adjustable resistors corresponding to the first comparator is 9:1, the first reference voltage is 0.1*VCCx, the resistance ratio of the two adjustable resistors corresponding to the second comparator is 1:9, and the second reference voltage is 0.9*VCCx, wherein VCCx is the standard supply voltage of the xth sub-module to be measured.

[0061] Then the audio processing circuit is driven to operate the conduction circuit, and the rising edge time of the power supply of each sub-module is detected through the first comparator and the second comparator, so as to obtain the power-on time of each sub-module.

[0062] For example, the power-on time measured in the embodiment of the present application is mainly the time period during which the voltage of the power supply rises from 10% to 90% of the standard supply voltage.

[0063] During the power-on process, when the first comparator reaches the corresponding first reference voltage, the first comparator outputs a high level, and the time is taken as the first time T1 of the corresponding sub-module, indicating that the sub-module starts to power on. When the second comparator reaches the corresponding second reference voltage, the second comparator outputs a high level, and the time is taken as the second time T2 of the corresponding sub-module, indicating that the sub-module powers off. At this time, the power-on time of each sub-module can be obtained as T2-T1.

[0064] The power-on time of each sub-module can be obtained through the measured first time and second time.

[0065] In fact, the timing of the power-on time starts from the output of the high level of the first comparator and ends from the output of the high level of the second comparator. Before reaching the corresponding reference voltage, the first comparator and the second comparator both output a low level.

[0066] In step S2, the impact voltage of the output end of the audio processing circuit is measured according to the power-on time of each sub-module and the preset conduction time level, and an optimal power-on control signal arrangement scheme set is obtained.

[0067] In the embodiment of the present application, the frequency of the detection signal is adjusted according to the power-on time of each sub-module, so as to control the power-on time of each sub-module when the impact voltage is tested.

[0068] For example, if the power-on time of a certain sub-module is 20us, a 100Hz detection signal is sent to the sub-module.

[0069] Optionally, the detection signal selected in the embodiment of the present application is a sine half-cycle signal.

[0070] To better illustrate, the frequency of the detection signal also refers to the preset conduction time level. In the embodiment of the application, the conduction time level is set to five levels, and the time difference between each level is 10 ms. The conduction time level is used to control the conduction time of the triode of each sub-module, so as to control the power-on time of the sub-module. The lower the level, the faster the power-on time.

[0071] Therefore, according to the power-on time of each sub-module, a corresponding conduction time level is selected for each sub-module, and a plurality of power-on control signal arrangement schemes are generated for the audio processing circuit according to the conduction time level of each sub-module.

[0072] Taking the need to test the impulse voltage of five sub-modules in the embodiment of the application as an example. When the conduction time level is set to five levels, each sub-module has five possible conduction time levels, but the level set in the same scheme for each sub-module is different, so a total of 120 different power-on control signal arrangement schemes can be generated (i.e. 5 x 4 x 3 x 2 x 1 = 120). For each power-on control signal arrangement scheme, a square wave signal is first sent to each sub-module to set the power-on time of the sub-module to the default power-on time, so that all modules have a unified default setting state. Then the frequency of the detection signal of each sub-module is determined according to the power-on control signal arrangement scheme, and the corresponding detection signal is sent to each sub-module for five times. Among them, the impulse voltage of the output end of the audio processing circuit is detected once for each time the detection signal is sent, a total of five times, and finally the impulse voltage obtained by the five times of detection is averaged to obtain the impulse voltage average of each power-on control signal arrangement scheme.

[0073] Further, because the sub-modules in the audio processing circuit may bring voltage changes to the output end when powered on, the voltage changes are represented as impulse sound, so impulse voltage sampling needs to be performed at the comparator of the output end.

[0074] For example, the reference voltage of the comparator of the output end is first set to 0.05*VCC, and the impulse voltage can be detected from the 1st pin and the 8th pin of the comparator of the output end after each sub-module receives the detection signal; if the calculated impulse voltage average exceeds 0.05VCC, it can be considered that there is impulse sound; if the calculated impulse voltage average does not exceed 0.05VCC, it can be considered that there is no impulse sound, and the corresponding power-on control signal arrangement scheme is added to the optimal power-on control signal arrangement scheme set.

[0075] Finally, the optimal power-on control signal arrangement scheme set obtained is stored, and the contents stored mainly include the power-on time of each sub-module, the frequency of the detection signal corresponding to each sub-module, the impulse voltage average, etc.

[0076] Step S3, according to the optimal power-on control signal arrangement scheme set, adjust the frequency of the power-on control signal sent to each sub-module to eliminate the impact sound when the audio processing circuit is powered on.

[0077] In the embodiment of the application, according to the optimal power-on control signal arrangement scheme set and the current environment, the frequency of the power-on control signal sent to each sub-module is adjusted, and then the power-on control signal is sent to each sub-module to turn on the circuit operation, so as to eliminate the impact sound when the audio processing circuit is powered on.

[0078] It is worth mentioning that the method provided by the application needs to be performed once every time the audio processor is powered on, so as to eliminate the impact sound caused by the change of power-on time due to the adaptive change of environment.

[0079] The implementation of the embodiment of the application has the following beneficial effects:

[0080] The embodiment of the application measures the power-on time of each sub-module in the audio processing module, provides data support for subsequent research on impact sound caused by the change of power-on time, and then generates a plurality of power-on control signal arrangement schemes according to the above power-on time and the preset turn-on time level to detect the influence of different power-on time sequences on impact voltage. Different frequencies of detection signals are sent to each sub-module based on the power-on control signal arrangement scheme, and the output end of the audio processing circuit is detected for multiple impact voltages and the mean value is taken, and it is judged which power-on control signal arrangement scheme will not produce impact sound according to the mean value, so as to determine the optimal power-on control signal arrangement scheme set. Finally, according to the optimal power-on control signal arrangement scheme set, the power-on time of each sub-module is arranged by setting the frequency of the power-on control signal, and the impact sound of the audio processor when powered on is effectively eliminated.

[0081] Second embodiment

[0082] Further, in order to execute the audio processor-oriented power-on impact sound elimination device corresponding to the above-mentioned method embodiment, to realize the corresponding functions and technical effects, FIG. 2 provides a structural diagram of an audio processor-oriented power-on impact sound elimination device. For the sake of convenience, only the part related to the present embodiment is shown, and the audio processor-oriented power-on impact sound elimination device provided by the embodiment of the application comprises:

[0083] The power-on time measurement module 201 is used for measuring the power-on time of each sub-module in the audio processing circuit.

[0084] In the embodiments of the present application, the first measurement circuit is used to set the first reference voltage of each sub-module, and the second measurement circuit is used to set the second reference voltage of each sub-module. Then, according to the first reference voltage and the second reference voltage, each sub-module in the audio processing circuit is driven to perform the turn-on circuit operation at the same time, so as to obtain the power-on time of each sub-module.

[0085] The impulse voltage measurement module 202 is configured to measure the impulse voltage of the output end of the audio processing circuit according to the power-on time of each sub-module and the preset turn-on time level, and obtain a set of optimal power-on control signal arrangement schemes.

[0086] In the embodiments of the present application, a plurality of power-on control signal arrangement schemes are generated according to the power-on time of each sub-module and the preset turn-on time level. Then, based on each power-on control signal arrangement scheme, a detection signal is sent to each sub-module, and the impulse voltage of the output end is measured, so as to obtain the average impulse voltage of each power-on control signal arrangement scheme. The power-on control signal arrangement scheme with the average impulse voltage less than the first threshold value is added to the set of optimal power-on control signal arrangement schemes.

[0087] The power-on control signal optimization module 203 is configured to adjust the frequency of the power-on control signal sent to each sub-module according to the set of optimal power-on control signal arrangement schemes, so as to eliminate the impact sound when the audio processing circuit is powered on.

[0088] In the embodiments of the present application, the frequency of the power-on control signal sent to each sub-module is adjusted according to the set of optimal power-on control signal arrangement schemes and the current environment, and then the power-on control signal is sent to each sub-module to perform the turn-on circuit operation, so as to eliminate the impact sound when the audio processing circuit is powered on.

[0089] It is worth mentioning that the method provided in the present application needs to be performed once each time the audio processor is started, so as to eliminate the impact sound caused by the change of the power-on time due to the adaptive change of the environment.

[0090] In some embodiments, the power-on time measurement module 201 further comprises:

[0091] When the audio processor is started, the signal disconnecting module is first disconnected, so that each module in the audio processing circuit is not powered on. The audio processor includes a signal input module, an audio processing circuit, a signal disconnecting module and a signal output module. When the audio processing circuit is powered on, the impact sound will occur due to the existence of a large impulse voltage. Therefore, in the embodiments of the present application, the power-on time of the sub-modules in the audio processing circuit needs to be measured and improved accordingly, so as to avoid the formation of a large impulse voltage when the audio processor is started.

[0092] Because each sub-module is powered by its own separate power supply, the power-on time of each sub-module is different when all sub-modules are powered on at the same time.

[0093] The power-on time of each sub-module is measured by the first measurement circuit and the second measurement circuit.

[0094] For better illustration, there are several first comparators in the first measurement circuit, each of which is set with a reference voltage by two adjustable resistors, and each of which is used to measure a sub-module. There are several second comparators in the second measurement circuit, each of which is set with a reference voltage by two adjustable resistors, and each of which is used to measure a sub-module.

[0095] The first reference voltage of the first comparator is set by setting the resistance ratio of the two adjustable resistors. Similarly, the second reference voltage of the second comparator is also set in this way. The first reference voltage and the second reference voltage are both related to the standard power voltage of the corresponding sub-module to be measured.

[0096] Optionally, in the embodiment of the present application, the resistance ratio of the two adjustable resistors corresponding to the first comparator is 9:1, and the first reference voltage is 0.1*VCCx; the resistance ratio of the two adjustable resistors corresponding to the second comparator is 1:9, and the second reference voltage is 0.9*VCCx. Wherein, VCCx is the standard power voltage of the xth sub-module to be measured.

[0097] Then drive the operation of the conduction circuit of each sub-module in the audio processing circuit, and detect the rising edge time of the power-on of the power supply of each sub-module through the first comparator and the second comparator, so as to obtain the power-on time of each sub-module.

[0098] For example, the power-on time measured by the embodiment of the present application is mainly the time period during which the voltage of the power supply rises from 10% to 90% of the standard power voltage.

[0099] During the power-on process, when the first comparator reaches the corresponding first reference voltage, the first comparator outputs high level, and takes this time as the first time T1 of the corresponding sub-module, indicating that the sub-module starts to power on. When the second comparator reaches the corresponding second reference voltage, the second comparator outputs high level, and takes this time as the second time T2 of the corresponding sub-module, indicating that the sub-module powers off. At this time, the power-on time of each sub-module can be obtained as T2-T1.

[0100] The power-on time of each sub-module can be obtained by measuring the first time and the second time.

[0101] In some embodiments, the impulse voltage measurement module 202 further comprises:

[0102] According to the power-on time of each sub-module, the frequency of the detection signal is adjusted, and thus the power-on time of each sub-module during the test of the impulse voltage is controlled.

[0103] For example, if the power-on time of a certain sub-module is 20us, a 100Hz detection signal is sent to the sub-module.

[0104] Optionally, the detection signal selected in the embodiments of the present application is a sine half-cycle signal.

[0105] For better illustration, the frequency of the detection signal is also referred to the preset conduction time level. In the embodiments of the present application, the conduction time level is set to 5 levels, and the time difference between each level is 10ms. The conduction time level is used to control the conduction time of the triode of each sub-module, so as to control the power-on time of the sub-module. The lower the level, the faster the power-on time.

[0106] Therefore, according to the power-on time of each sub-module, the corresponding conduction time level of each sub-module is selected, and according to the conduction time level of each sub-module, a plurality of power-on control signal arrangement schemes are generated for the audio processing circuit.

[0107] Taking the example of the impulse voltage test of 5 sub-modules in the embodiments of the present application, when the conduction time level is set to 5 levels, each sub-module has 5 possible conduction time levels, and thus 120 different power-on control signal arrangement schemes can be generated. For each power-on control signal arrangement scheme, a square wave signal is first sent to each sub-module to set the power-on time of the sub-module to the default power-on time, and then the frequency of the detection signal of each sub-module is determined according to the power-on control signal arrangement scheme, and the corresponding detection signal is sent to each sub-module for 5 times. Among them, the impulse voltage of the output end of the audio processing circuit is detected once for each time of sending the detection signal, and the impulse voltage is detected for 5 times in total, and finally the average value of the impulse voltage obtained by the 5 times of detection is obtained. The average value of the impulse voltage of each power-on control signal arrangement scheme.

[0108] Further, because the sub-modules in the audio processing circuit may cause voltage change of the output end when powered on, the voltage change is the manifestation of the impulse sound, and thus the impulse voltage sampling needs to be performed at the comparator of the output end.

[0109] Exemplarily, the reference voltage of the comparator of the output end is set as 0.05*VCC, and the impulse voltage can be detected from the 1st pin and the 8th pin of the comparator of the output end after each sub-module receives the detection signal; if the mean value of the calculated impulse voltage exceeds 0.05VCC, it can be considered that there is an impulse sound; if the mean value of the calculated impulse voltage does not exceed 0.05VCC, it can be considered that there is no impulse sound, and the corresponding power-on control signal arrangement scheme is added to the optimal power-on control signal arrangement scheme set.

[0110] The embodiment of the present application has the following beneficial effects:

[0111] The embodiment of the present application first determines the power-on time of the sub-modules of the audio processing module by setting two reference voltages, provides data support for subsequent research on impulse sound caused by the change of the power-on time; then the pre-set conduction time level sets the power-on time of the sub-modules, measures the impulse voltage under each power-on time, and measures the size of the impulse sound according to the mean value of the impulse voltage, to obtain the optimal power-on control signal arrangement scheme set that makes the audio processor power on without impulse sound; finally, according to the optimal power-on control signal arrangement scheme set, the power-on time of each sub-module is arranged by setting the frequency of the power-on control signal, effectively eliminating the impulse sound of the audio processor during power-on.

[0112] Third embodiment

[0113] Further, Fig. 3 is a structure diagram of an audio processor-oriented power-on impulse sound elimination system provided by an embodiment of the present application, which includes a microprocessor, an audio processing circuit, a first measurement circuit and a second measurement circuit.

[0114] The microprocessor 301 is used to execute the audio processor-oriented power-on impulse sound elimination method as described in the present application.

[0115] The audio processing circuit 302 is used to receive the signal sent by the microprocessor.

[0116] The first measurement circuit 303 is used to measure the first reference voltage of the sub-modules in the audio processing circuit.

[0117] The second measurement circuit 304 is used to measure the second reference voltage of the sub-modules in the audio processing circuit.

[0118] The microprocessor 301 is connected with the audio processing circuit 302, the first measurement circuit 303 and the second measurement circuit 304 respectively; and the audio processing circuit 302 is connected with the first measurement circuit 303 and the second measurement circuit 304 respectively.

[0119] As an improvement of the above scheme, the audio processing circuit 302 comprises: a first amplifier (i.e. U29A in FIG. 3), an ADC module, a DSP audio processing module, a DAC module, a second amplifier (i.e. U29BA in FIG. 3) and an output terminal. In the embodiment of the present application, the power-on time of the first amplifier, the ADC module, the DSP audio processing module, the DAC module and the second amplifier is measured and the impulse voltage is sampled.

[0120] The first amplifier is connected with the ADC module, the ADC module is connected with the DSP audio processing module, the DSP audio processing module is connected with the DAC module, the DAC module is connected with the second amplifier, and the second amplifier is connected with the output terminal. The output terminal comprises a signal on-off module and a signal output terminal.

[0121] As an improvement of the above scheme, the microprocessor controls the base of the triode Q6, Q8, Q9, Q7 and Q10 to be low level through resistors R16, R18, R19, R17 and R20, so as to make the signal on-off module be disconnected and the triode Q6, Q8, Q9, Q7 and Q10 be not conductive, and the corresponding first amplifier, ADC module, DSP audio processing module, DAC module and second amplifier be not powered on. The microprocessor controls the base of the triode Q6, Q8, Q9, Q7 and Q10 to be high level through resistors R16, R18, R19, R17 and R20, so as to make the triode Q6, Q8, Q9, Q7 and Q10 be conductive, and the corresponding first amplifier, ADC module, DSP audio processing module, DAC module and second amplifier be powered on.

[0122] Therefore, the microprocessor controls the conduction time of the triode Q6, Q8, Q9, Q7 and Q10 through resistors R16, R18, R19, R17 and R20, and then controls the conduction time of the triode Q1, Q3, Q4, Q2 and Q5, so as to control the power-on time of the corresponding first amplifier, ADC module, DSP audio processing module, DAC module and second amplifier.

[0123] The first measurement circuit 303 comprises six groups of first comparators, namely AR1, AR2, AR3, AR4, AR5 and AR6. Each group of first comparators is connected with two adjustable resistors for adjusting the reference voltage. Specifically, AR1 is connected with adjustable resistors R21 and R22, AR2 is connected with adjustable resistors R23 and R24, AR3 is connected with adjustable resistors R25 and R26, AR4 is connected with adjustable resistors R27 and R28, AR5 is connected with adjustable resistors R29 and R30, and AR6 is connected with adjustable resistors R31 and R32.

[0124] The second measurement circuit 304 includes five groups of second comparators, AR7, AR8, AR9, AR10 and AR11. Each group of second comparators is connected with two adjustable resistors for adjusting the reference voltage. AR7 is connected with adjustable resistors R33 and R34, AR8 is connected with adjustable resistors R35 and R36, AR9 is connected with adjustable resistors R37 and R38, AR10 is connected with adjustable resistors R39 and R40, and AR11 is connected with adjustable resistors R41 and R42.

[0125] The first amplifier is connected with AR1 and AR9, the ADC module is connected with AR2 and AR7, the DSP audio processing module is connected with AR3 and AR8, the DAC module is connected with AR6 and AR10, and the second amplifier is connected with AR4 and AR11.

[0126] AR5 is used for measuring the impact voltage of the output end, and the voltage output from the first pin and the eighth pin of AR5 is detected.

[0127] As an improvement of the above scheme, when measuring the power-on time of each sub-module, the timing starts from the output of high level from AR1-6 and stops when the output of high level from AR7-11 is output. When sampling the impact voltage, the microcontroller sends a half-cycle sinusoidal signal to transistors Q6, Q8, Q9, Q7 and Q10.

[0128] The implementation of the embodiment of the present application has the following beneficial effects:

[0129] The embodiment of the present application controls the conduction and disconnection of each sub-module by the microprocessor controlling the transistors connected with the audio processing circuit. The power-on time of each sub-module is controlled by controlling the conduction time of the transistors to reduce the impact voltage, thereby eliminating the impact sound when the audio processor is powered on. The reference voltage of the comparators in the first measurement circuit and the second measurement circuit is controlled by the microprocessor to measure the power-on time of each sub-module, and the comparator of the first measurement circuit is used to detect whether the impact voltage of the output end exceeds the threshold value, so as to determine whether there is an impact sound, so as to effectively eliminate the impact sound of the audio processor when powered on by reducing the impact voltage.

[0130] The above-described specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above-described specific embodiments are only for the specific embodiments of the present application and do not limit the protection scope of the present application. It is particularly pointed out that any modification, equivalent replacement, improvement, etc. made by those skilled in the art within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for an audio processor to eliminate power-on pop sound, characterized in that, The application relates to an audio processing circuit and a method for eliminating the impact sound during the power-on of the audio processing circuit. The application comprises the following steps: measuring the power-on time of each sub-module in the audio processing circuit; measuring the impact voltage of the output end of the audio processing circuit according to the power-on time of each sub-module and a preset conduction time level, and obtaining an optimal power-on control signal arrangement scheme set; 2. The method of claim 1, wherein, adjusting the frequency of the power-on control signal sent to each sub-module according to the optimal power-on control signal arrangement scheme set, so as to eliminate the impact sound during the power-on of the audio processing circuit. The measuring of the power-on time of each sub-module in the audio processing circuit is specifically as follows: a first reference voltage of each sub-module is set through a first measuring circuit, and a second reference voltage of each sub-module is set through a second measuring circuit; wherein the first measuring circuit comprises a plurality of first comparators, and the second measuring circuit comprises a plurality of second comparators; each sub-module corresponds to one first comparator and one second comparator; 3. The method of claim 2, wherein, driving each sub-module in the audio processing circuit to simultaneously perform the operation of the conduction circuit according to the first reference voltage and the second reference voltage, and obtaining the power-on time of each sub-module. The driving of each sub-module in the audio processing circuit to simultaneously perform the operation of the conduction circuit according to the first reference voltage and the second reference voltage, and obtaining the power-on time of each sub-module is specifically as follows: driving each sub-module in the audio processing circuit to simultaneously perform the operation of the conduction circuit, and measuring each first comparator and each second comparator; when the first comparator reaches the first reference voltage, the first time of the corresponding sub-module is obtained; when the second comparator reaches the second reference voltage, the second time of the corresponding sub-module is obtained; 4. The method of claim 1, wherein the method is performed by an audio processor. obtaining the power-on time of each sub-module according to the difference between the first time and the second time of each sub-module. The measuring of the impact voltage of the output end of the audio processing circuit according to the power-on time of each sub-module and a preset conduction time level, and obtaining an optimal power-on control signal arrangement scheme set is specifically as follows: generating a plurality of power-on control signal arrangement schemes according to the power-on time of each sub-module and the preset conduction time level; sending a detection signal to each sub-module according to each power-on control signal arrangement scheme, and measuring the impact voltage of the output end, so as to obtain the impact voltage average of each power-on control signal arrangement scheme; 5. The method of claim 4, wherein, adding the power-on control signal arrangement scheme with the impact voltage average less than a first threshold value to the optimal power-on control signal arrangement scheme set. The generating of a plurality of power-on control signal arrangement schemes according to the power-on time and the preset conduction time level is specifically as follows: the conduction time level is divided into a second threshold value of levels, and the power-on time set in different levels is different; selecting a corresponding conduction time level for each sub-module according to the power-on time of each sub-module; generating a plurality of power-on control signal arrangement schemes for the audio processing circuit according to the conduction time level of each sub-module; wherein in each power-on control signal arrangement scheme, the conduction time levels of any two sub-modules are different.

6. The method of claim 4, wherein the method further comprises: The detection signal is sent to each sub-module according to each power-on control signal arrangement scheme, and the impulse voltage of the output end is measured to obtain the average impulse voltage of each power-on control signal arrangement scheme, specifically as follows: According to each power-on control signal arrangement scheme, the frequency of the detection signal corresponding to each sub-module is set, and then the detection signal corresponding to the third threshold value is sent to each sub-module; After sending the detection signal, the impulse voltage of the output end under each power-on control signal arrangement scheme is measured and averaged to obtain the average impulse voltage of each power-on control signal arrangement scheme.

7. An apparatus for eliminating power-on pop sound oriented to an audio processor, characterized by, It comprises: a power-on time measurement module, an impulse voltage measurement module, and a power-on control signal optimization module; The power-on time measurement module is used to measure the power-on time of each sub-module in the audio processing circuit. The impulse voltage measurement module is used to measure the impulse voltage of the output end of the audio processing circuit according to the power-on time of each sub-module and the preset conduction time level to obtain a set of optimal power-on control signal arrangement schemes. The power-on control signal optimization module is used to adjust the frequency of the power-on control signal sent to each sub-module according to the set of optimal power-on control signal arrangement schemes to eliminate the impact sound when the audio processing circuit is powered on.

8. A system for eliminating power-up pop sound for an audio processor, characterized in that, It comprises: a microprocessor, an audio processing circuit, a first measurement circuit, and a second measurement circuit; The microprocessor is used to execute the power-on impact sound elimination method for an audio processor as claimed in any one of claims 1 to 6. The audio processing circuit is used to receive the signal sent by the microprocessor. The first measurement circuit is used to measure the first reference voltage of the sub-module in the audio processing circuit. The second measurement circuit is used to measure the second reference voltage of the sub-module in the audio processing circuit. The microprocessor is connected with the audio processing circuit, the first measurement circuit, and the second measurement circuit respectively; the audio processing circuit is connected with the first measurement circuit and the second measurement circuit respectively.

9. The method of claim 8, wherein, The audio processing circuit comprises a first amplifier, an ADC module, a DSP audio processing module, a DAC module, a second amplifier, and an output end. The second amplifier is connected with the output end. The output end is used to detect the voltage change of the second amplifier to obtain the impulse voltage of the output end.

10. The method of claim 8, wherein the method further comprises: The first measurement circuit comprises a plurality of first comparators, each first comparator being connected with two first adjustable resistors, and the first adjustable resistors being used to set the first reference voltage; the second measurement circuit comprises a plurality of second comparators, each second comparator being connected with two second adjustable resistors, and the second adjustable resistors being used to set the second reference voltage.

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