CN110505555B - Acoustic gain regulation and control method and device based on sound system - Google Patents
Acoustic gain regulation and control method and device based on sound system Download PDFInfo
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- CN110505555B CN110505555B CN201910811034.1A CN201910811034A CN110505555B CN 110505555 B CN110505555 B CN 110505555B CN 201910811034 A CN201910811034 A CN 201910811034A CN 110505555 B CN110505555 B CN 110505555B
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- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/02—Circuits for transducers, loudspeakers or microphones for preventing acoustic reaction, i.e. acoustic oscillatory feedback
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
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- H04R2430/01—Aspects of volume control, not necessarily automatic, in sound systems
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Abstract
The embodiment of the application provides an acoustic gain control method and device based on a sound system, which relate to the field of acoustics and comprise the steps of detecting whether a howling exists in the sound system or not by taking a preset detection method as a basis; when no acoustic whistle exists in the sound system, judging whether the acoustic gain value of the sound system is smaller than a preset initial gain value; when the acoustic gain value is smaller than the initial gain value, detecting whether adjustment information is received; the acoustic gain value is smaller than the initial gain value and is used for indicating that the acoustic howling in the sound system is suppressed; when the adjustment information is detected, the acoustic gain value is adjusted according to the adjustment information. By implementing this embodiment, the effect of audio output can be automatically adjusted with howling suppressed in the sound system, thereby improving the quality of audio output.
Description
Technical Field
The application relates to the technical field of acoustics, in particular to an acoustic gain control method and device based on a sound system.
Background
Currently, in a sound system, an audio signal played by a speaker is picked up by a microphone, and the microphone signal is transmitted to the speaker for playing. In the transmission process, when the volume is large or the distance between the microphone and the loudspeaker is short, the sound feedback loop forms positive feedback at certain frequencies, so that the sound is amplified step by step in continuous feedback, an irritating howling sound is generated, and the auditory experience of a user is seriously influenced.
However, it has been found in practice that the current howling suppression measures include a measure of suppressing by the frequency shift method and a measure of suppressing by the trap. However, the sound system often becomes silent or deteriorated in tone after howling is suppressed, resulting in a reduction in the audio output effect of the sound system. Therefore, the existing methods only have a method for suppressing howling, but have no method which can be adjusted according to actual conditions to ensure high audio output effect.
Disclosure of Invention
An object of the embodiments of the present application is to provide a method and an apparatus for adjusting and controlling an acoustic gain based on a sound system, which can automatically adjust an audio output effect under the condition that a howling is suppressed in the sound system, thereby improving the quality of the audio output.
The embodiment of the application provides an acoustic gain control method based on a sound system, which comprises the following steps:
detecting whether a howling exists in the sound system or not by taking a preset detection method as a basis;
when no acoustic whistle exists in the sound system, judging whether the acoustic gain value of the sound system is smaller than a preset initial gain value;
when the acoustic gain value is smaller than the initial gain value, detecting whether adjustment information is received; the acoustic gain value is smaller than the initial gain value and is used for indicating that the howling in the sound system is suppressed;
and when the adjustment information is detected, adjusting the acoustic gain value according to the adjustment information.
In the implementation process, whether a howling exists in the sound system (i.e. whether an audible howling exists in the field environment) can be preferentially detected, and when the audible howling does not exist in the field environment (it can be understood that the howling disappears or is suppressed in the current period), on the basis, the method further detects whether the acoustic gain of the sound system is smaller than a preset initial gain value to determine whether suppression processing is performed on the possible howling, wherein when the acoustic gain is smaller than the preset initial gain value, it can be stated that the howling does exist before and has been processed, and when the acoustic gain is larger than or equal to the preset initial gain value, it can be stated that the howling does not exist before; meanwhile, after the above steps determine that the howling exists before and is processed, whether adjustment information for adjusting the sound system is received or not is detected, and if so, an acoustic gain value in the sound system is adjusted according to the adjustment information (wherein, the adjustment information may be adjustment of a distance between a microphone and the sound or adjustment of volume of the sound system); after the acoustic gain value is adjusted, whether the howling occurs can be detected, if the howling does not occur, the howling can be adjusted according to the flow sequence, and if the howling occurs, the occurred howling is restrained. Therefore, the above process can detect whether the howling occurs under the current condition, and if the howling does not occur, whether the howling does not exist all the time or whether the howling exists before but is suppressed is judged, and the method detects whether the volume adjustment information or the distance adjustment information is received when the howling exists before and is suppressed, and adjusts the acoustic gain value in the sound system when one of the two information is received (wherein the acoustic gain value is adjusted when the howling is suppressed), so that the method for adjusting the acoustic gain according to the actual condition is realized, and on the basis of adjusting the acoustic gain, a high audio output effect can be effectively ensured.
Further, the method further comprises:
and when the acoustic system has acoustic whistle, reducing the acoustic gain value of the acoustic system according to a preset first adjusting parameter.
In the implementation process, the method can reduce the acoustic gain value of the sound system according to the preset adjustment parameter under the condition that the sound system still has the sound howls so as to inhibit the sound system from generating the sound howls. Therefore, the step can suppress the acoustic feedback when the acoustic system generates the acoustic feedback, so that on the basis that the method can improve the real-time performance of field adjustment, the acoustic feedback can be suppressed or gain can be released in real time according to specific conditions, and the regulation and control integrity of the acoustic gain can be ensured.
Further, when the adjustment information is detected, the step of adjusting the acoustic gain value according to the adjustment information includes:
when the adjustment information is detected, judging whether the adjustment information is volume adjustment information or not;
when the adjustment information is the volume adjustment information, judging whether the audio adjustment amplitude included in the volume adjustment information is larger than a preset first adjustment amplitude;
and when the audio adjusting amplitude is larger than the first adjusting amplitude, the acoustic gain value is increased according to a second adjusting parameter included in the volume adjusting information.
In the implementation process, when the adjustment information is detected, the type of the adjustment information is judged, and when the type of the adjustment information is judged to be the volume adjustment information, whether the volume adjustment amplitude is larger than a preset first adjustment amplitude is judged, if so, the volume of the sound system is effectively adjusted by a user, and the acoustic gain value is increased according to a preset adjustment method on the basis. Therefore, the method can adjust the acoustic gain value according to the volume adjustment of the sound system by a user, and is particularly used for automatically carrying out restorability adjustment on the previously adjusted acoustic gain value when the volume change is detected, so that the field automatic adjustment performance of the sound system is ensured, and the optimal audio output effect of the sound system can be further ensured in real time.
Further, when the adjustment information is detected, the step of adjusting the acoustic gain value according to the adjustment information includes:
when the adjustment information is detected, judging whether the adjustment information is signal strength change information or not;
when the adjustment information is the signal strength change information, judging whether the signal strength change amplitude included in the signal strength change information is larger than a preset second adjustment amplitude or not;
and when the signal intensity change amplitude is larger than the second adjustment amplitude, increasing the acoustic gain value according to a third adjustment parameter included in the signal intensity change information.
In the implementation process, when the adjustment information is detected, the type of the adjustment information is judged, and when the type of the adjustment information is judged to be the signal intensity change information, whether the signal intensity change amplitude is larger than a preset second adjustment amplitude is judged, if so, it is indicated that a microphone in the sound system is far away from the sound, and on the basis, the acoustic gain value is increased according to a preset adjustment method. Therefore, the method can adjust the acoustic gain value according to the distance between the microphone and the sound in the sound system, so that the previously adjusted acoustic gain value can be automatically subjected to restorability adjustment, the field automatic adjustment performance of the sound system is ensured, and the optimal audio output effect of the sound system can be further ensured in real time.
Further, the method further comprises:
and when the adjustment information is not detected, triggering and executing the step of detecting whether the sound system has the howling or not based on a preset detection method.
And in the implementation process, when determining that no adjustment information is detected, detecting whether the howling exists in the current environment again. Therefore, the method can process the acoustic gain on the preset premise, so that the real-time performance of the acoustic gain processing in the sound system is ensured, and the audio output quality of the sound system is improved.
Further, the preset detection method comprises a detection method based on peak even harmonic power ratio and a detection method based on interframe peak value holding degree.
In the implementation process, the detection method of the acoustic howling is a combination method of a detection method based on the peak even harmonic power ratio and a detection method based on the interframe peak value retention degree, the effect is better than that of a single method, and the precision is higher.
Further, the acoustic gain comprises an acoustic feedback loop gain based on the sound system and/or a trap gain based on the sound system.
In the implementation process, the type of the acoustic gain is confirmed, so that the method can be operated when the type of the acoustic gain is any one of the two types, and the output effect of the sound system is ensured.
A second aspect of the embodiments of the present application provides an acoustic gain control device based on a sound system, where the acoustic gain control device based on the sound system includes:
the detection unit is used for detecting whether the acoustic system has acoustic howling or not according to a preset detection method;
the judging unit is used for judging whether the acoustic gain value of the sound system is smaller than a preset initial gain value or not when no acoustic whistle exists in the sound system;
the detection unit is further configured to detect whether adjustment information is received when the acoustic gain value is smaller than the initial gain value; the acoustic gain value is smaller than the initial gain value and is used for indicating that the howling in the sound system is suppressed;
and the adjusting unit is used for adjusting the acoustic gain value according to the adjusting information when the adjusting information is detected.
In the implementation process, the acoustic gain control device based on the sound system includes a detection unit that can detect whether there is a howling in the sound system, and when the determination unit determines that there is the howling in the sound system, determine whether an acoustic gain value in the sound system is smaller than a preset initial gain value, when the determination unit determines that the acoustic gain value in the sound system is smaller than the preset initial gain value, the detection unit detects whether adjustment information is received, and finally, the adjustment unit adjusts the acoustic gain value when determining that the detection unit detects the adjustment information. Therefore, by implementing the implementation mode, the acoustic gain regulating and controlling device based on the sound system can be triggered to execute the corresponding adjustment of the acoustic gain value through the combination of the detecting unit, the judging unit and the adjusting unit, so that the method for adjusting the acoustic gain of the sound system according to the actual situation is ensured, and the higher audio output effect can be effectively ensured on the basis of adjusting the acoustic gain.
A third aspect of embodiments of the present application provides an electronic device, including a memory and a processor, where the memory is used to store a computer program, and the processor runs the computer program to make the computer device execute the method for adjusting and controlling acoustic gain based on a sound system according to any one of the first aspect of embodiments of the present application.
A fourth aspect of the present embodiment provides a computer-readable storage medium, which stores computer program instructions, where the computer program instructions, when read and executed by a processor, perform the method for adjusting and controlling acoustic gain based on a sound system according to any one of the first aspect of the present embodiment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
Fig. 1 is a schematic flowchart of an acoustic gain control method based on a sound system according to an embodiment of the present disclosure;
fig. 2 is a schematic flowchart of another acoustic gain control method based on a sound system according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of an acoustic gain control apparatus based on a sound system according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of another acoustic gain control device based on an acoustic system according to an embodiment of the present disclosure;
fig. 5 is a schematic flowchart of an acoustic gain control method when an acoustic gain is a link gain according to an embodiment of the present disclosure;
fig. 6 is a schematic view of an actual flow of an acoustic gain control method when an acoustic gain is a gain of a wave trap according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of an acoustic gain control device based on an acoustic system according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
Example 1
Referring to fig. 1, fig. 1 is a schematic flow chart of an acoustic gain control method based on a sound system according to an embodiment of the present application. The acoustic gain control based on the sound system is applied to any sound system which can possibly generate the acoustic whistle, and the acoustic gain value in the sound system is adjusted in real time under the condition that the acoustic whistle possibly exists, so that the output effect of the sound system is ensured. The acoustic gain control method based on the sound system comprises the following steps:
s101, detecting whether a howling exists in a sound system or not by taking a preset detection method as a basis, and if so, ending the process; if not, go to step S102.
In this embodiment, the preset detection method includes a detection method based on a peak even harmonic power ratio and a detection method based on an inter-frame peak value retention.
In the present embodiment, this step is used to detect whether acoustic feedback of howling is formed in the sound system, wherein when the signal has truncation distortion, the existing detection method cannot determine that howling occurs, and therefore, howling detection is performed by two conditions of Peak-to-Even Harmonic Power Ratio (PEHPR) and inter-frame Peak magnetic Power Persistence (IPMP) in the present embodiment.
In the present embodiment, the PEHPR may be defined as the following expression:
in the above expression, X (w)kI) represents the signal of the ith frame in the candidate howling frequency point wkPower of (d), X (mw)kI) represents the signal of the ith frame in the candidate howling frequency point wkPower at the m-th harmonic of (1), XHRepresenting the mean of the power spectrum at m-th order m e {0.5,2,4} harmonics of the current frame signal. If the current frame signal has power X (w) at the candidate howling frequency pointkThe ratio of i) to the mean of the power spectrum at the m harmonic is greater than the detection threshold, PEHPR (w)kAnd i, m) is more than or equal to T, the howling is judged to be generated. The method comprises the following steps of: the howling audio has no harmonic component when no cut-top distortion occurs, only odd harmonic but no even harmonic after the cut-top distortion occurs, however, normal audio signals have abundant even harmonic components, and therefore whether the howling is generated or not is judged by counting the ratio of the power of the candidate howling frequency point to the sum of the m harmonic power of the candidate howling frequency point.
In the present embodiment, IPMP may be defined as the following expression:
the method can adopt the conceptual description, and the principle of the method is based on the fact that the howling component has longer peak duration than the normal voice signal, so that the frequency of acquiring the power spectrum peak value at the candidate howling frequency point in the past N frames of signals can be counted, and if the frequency exceeds a certain frequency, the howling is judged to be generated.
In this embodiment, the above method of performing howling detection by combining the PEHPR and IPMP detection methods may determine that howling is actually generated when both methods determine that howling is generated, and may define a candidate frequency point satisfying the condition as a howling frequency point.
As an optional implementation manner, based on a preset detection method, the method for detecting whether there is a howling in the sound system may include:
and detecting whether the acoustic system has the acoustic howling or not according to two detection methods of PEHPR and IPMP.
By implementing this embodiment, the detection accuracy of howling can be improved.
As a further optional implementation manner, based on a preset detection method, the method for detecting whether there is a howling in the sound system may include:
detecting whether the sound system has the howls according to a detection method of the PEHPR, and detecting whether the sound system has the howls according to a detection method of the IPMP;
if the result of PEHPR detection is the result of existence of howling and the result of IPMP detection is the result of existence of howling, the flow ends, and if the above result is not met, step S102 is executed.
By implementing this embodiment, the detection accuracy of howling can be improved.
As an optional implementation manner, based on a preset detection method, the step of detecting whether there is a howling in the sound system may include:
and after a preset time period, detecting whether the acoustic system has the howling or not according to a preset detection method.
By implementing such an embodiment, the frequency of execution of the method can be limited, thereby reducing the burden of implementation of the method and improving the accuracy of implementation of the method (because too fast detection results in too small a change and low accuracy).
In this embodiment, the preset time period may be manually adjusted and controlled, and is not limited in this embodiment.
S102, judging whether the acoustic gain value of the sound system is smaller than a preset initial gain value, if so, executing a step S103; if not, the flow is ended.
In this embodiment, the acoustic gain includes an acoustic feedback loop gain based on the sound system and/or a trap gain based on the sound system.
In this embodiment, the acoustic gain value of the sound system may be an acoustic feedback loop gain of the sound, i.e. a link gain of the sound system. The acoustic gain is used for improving a link (or called a loop), and when the acoustic gain is a noise, the acoustic gain is reduced to avoid the noise.
In this embodiment, the acoustic gain of the sound system may also be a trap gain based on the sound system, where the trap gain is used to indicate the gain effect generated by the activation of each frequency point trap. In particular, it can be understood that when the trap is used, the trap generates a negative gain, resulting in a decrease in gain, that is, when the trap is used, and the gain is negative, indicating that the trap is used, that is, indicating that there is a trap for suppressing howling, wherein the trap gain is also related to the current trap effect of the trap.
In this embodiment, the gain of the trap may be set when in use, specifically, when howling is detected, a howling frequency point is detected, and when no trap is present at the howling frequency point, the frequency point trap of the frequency point is added and the trap is performed, so as to reduce the gain of the trap.
In this embodiment, the initial gain value may be zero. Wherein the initial gain value may be understood as a gain criterion when no gain is generated. And, the initial gain value is effective for any acoustic gain.
In this embodiment, the initial gain value may be set or changed according to specific situations.
S103, detecting whether the adjustment information is received or not, and if so, executing a step S104; if not, the flow is ended.
In this embodiment, the acoustic gain value being smaller than the initial gain value is used to indicate that the howling in the sound system has been suppressed.
In this embodiment, the adjustment information may include volume adjustment information and signal strength adjustment information, where the volume adjustment information is information generated when the volume is adjusted, and the signal strength adjustment information may be understood as information generated when there is displacement transformation between the microphone and the audio.
And S104, adjusting the acoustic gain value according to the adjustment information.
In this embodiment, the adjustment information at least includes the amplitude of the adjustment and the type of the adjustment.
As an alternative embodiment, the step of adjusting the acoustic gain value according to the adjustment information may include:
and adjusting the acoustic gain value according to the adjustment amplitude included in the adjustment information.
By implementing the embodiment, the adjustment reference of the acoustic gain value can be defined, thereby improving the adjustment precision of the acoustic gain value.
In this embodiment, the main execution body of the acoustic gain control method based on the acoustic system may be an acoustic system main body, or may be a control device or a processing device (such as a processor or a remote sensing control device) based on the acoustic system, and this embodiment is not limited in any way.
It can be seen that, by implementing the acoustic gain control method based on the sound system described in fig. 1, it is possible to detect whether a howling occurs under the current conditions, and if the howling does not occur, it is determined whether the howling does not exist all the way or whether the howling exists before but is suppressed, and this method detects whether volume adjustment information or distance adjustment information is received when the howling exists before and is suppressed, and adjusts an acoustic gain value in the sound system when one of the two information is received (where the acoustic gain value is adjusted to suppress the howling), thereby implementing a method of adjusting the acoustic gain according to the actual conditions, and further, on the basis of adjusting the acoustic gain, it is possible to effectively ensure a high audio output effect.
Example 2
Referring to fig. 2, fig. 2 is a schematic flowchart of another acoustic gain control method based on a sound system according to an embodiment of the present application. The flow diagram of the acoustic gain control method based on the sound system depicted in fig. 2 is improved according to the flow diagram of the acoustic gain control method based on the sound system depicted in fig. 1. The acoustic gain control method based on the sound system comprises the following steps:
s201, detecting whether a howling exists in the sound system or not according to a preset detection method, and if so, executing a step S210; if not, go to step S202.
In this embodiment, the preset detection method includes a detection method based on a peak even harmonic power ratio and a detection method based on an inter-frame peak value retention.
In this embodiment, the preset detection method includes a detection method based on a peak even harmonic power ratio and a detection method based on an inter-frame peak value retention.
In the present embodiment, this step is used to detect whether acoustic feedback of howling is formed in the sound system, wherein when the signal has truncation distortion, the existing detection method cannot determine that howling occurs, and therefore, howling detection is performed by two conditions of Peak-to-Even Harmonic Power Ratio (PEHPR) and inter-frame Peak magnetic Power Persistence (IPMP) in the present embodiment.
In the present embodiment, the PEHPR may be defined as the following expression:
in the above expression, X (w)kI) represents the signal of the ith frame in the candidate howling frequency point wkPower of (d), X (mw)kI) represents the signal of the ith frame in the candidate howling frequency point wkPower at the m-th harmonic of (1), XHRepresenting the mean of the power spectrum at m-th order m e {0.5,2,4} harmonics of the current frame signal. If the current frame signal has power X (w) at the candidate howling frequency pointkThe ratio of i) to the mean of the power spectrum at the m harmonic is greater than the detection threshold, PEHPR (w)kAnd i, m) is more than or equal to T, the howling is judged to be generated. The method comprises the following steps of: the howling audio has no harmonic component when no cut-top distortion occurs, has odd harmonic and no even harmonic after the cut-top distortion occurs, but the normal audio signal has rich even harmonic component, so the candidate howling frequency point power and the m harmonic power thereof are countedThe ratio of the sums is used to determine whether howling has occurred.
In the present embodiment, IPMP may be defined as the following expression:
the method can adopt the conceptual description, and the principle of the method is based on the fact that the howling component has longer peak duration than the normal voice signal, so that the frequency of acquiring the power spectrum peak value at the candidate howling frequency point in the past N frames of signals can be counted, and if the frequency exceeds a certain frequency, the howling is judged to be generated.
In this embodiment, the above method of performing howling detection by combining the PEHPR and IPMP detection methods may determine that howling is actually generated when both methods determine that howling is generated, and may define a candidate frequency point satisfying the condition as a howling frequency point.
As an optional implementation manner, based on a preset detection method, the method for detecting whether there is a howling in the sound system may include:
and detecting whether the acoustic system has the acoustic howling or not according to two detection methods of PEHPR and IPMP.
By implementing this embodiment, the detection accuracy of howling can be improved.
As a further optional implementation manner, based on a preset detection method, the method for detecting whether there is a howling in the sound system may include:
detecting whether the sound system has the howls according to a detection method of the PEHPR, and detecting whether the sound system has the howls according to a detection method of the IPMP;
if the result of PEHPR detection is the result of existence of howling and the result of IPMP detection is the result of existence of howling, the present flow is terminated, and if the above result is not met, step S202 is executed.
By implementing this embodiment, the detection accuracy of howling can be improved.
As an optional implementation manner, based on a preset detection method, the step of detecting whether there is a howling in the sound system may include:
and after a preset time period, detecting whether the acoustic system has the howling or not according to a preset detection method.
By implementing such an embodiment, the frequency of execution of the method can be limited, thereby reducing the burden of implementation of the method and improving the accuracy of implementation of the method (because too fast detection results in too small a change and low accuracy).
In this embodiment, the preset time period may be manually adjusted and controlled, and is not limited in this embodiment.
S202, judging whether the acoustic gain value of the sound system is smaller than a preset initial gain value, if so, executing a step S203; if not, the flow is ended.
In this embodiment, the acoustic gain value being smaller than the initial gain value is used to indicate that the howling in the sound system has been suppressed.
In this embodiment, the acoustic gain includes an acoustic feedback loop gain based on the sound system and/or a trap gain based on the sound system.
In this embodiment, the acoustic gain value of the sound system may be an acoustic feedback loop gain of the sound, i.e. a link gain of the sound system. The acoustic gain is used for improving a link (or called a loop), and when the acoustic gain is a noise, the acoustic gain is reduced to avoid the noise.
In this embodiment, the acoustic gain of the sound system may also be a trap gain based on the sound system, where the trap gain is used to indicate the gain effect generated by the activation of each frequency point trap. In particular, it can be understood that when the trap is used, the trap generates a negative gain, resulting in a decrease in gain, that is, when the trap is used, and the gain is negative, indicating that the trap is used, that is, indicating that there is a trap for suppressing howling, wherein the trap gain is also related to the current trap effect of the trap.
In this embodiment, the gain of the trap may be set when in use, specifically, when howling is detected, a howling frequency point is detected, and when no trap is present at the howling frequency point, the frequency point trap of the frequency point is added and the trap is performed, so as to reduce the gain of the trap.
In this embodiment, the initial gain value may be zero. Wherein the initial gain value may be understood as a gain criterion when no gain is generated. And, the initial gain value is effective for any acoustic gain.
In this embodiment, the initial gain value may be set or changed according to specific situations.
S203, detecting whether the adjustment information is received, if so, executing a step S204; if not, step S201 is executed.
In this embodiment, the adjustment information may include volume adjustment information and signal strength adjustment information, where the volume adjustment information is information generated when the volume is adjusted, and the signal strength adjustment information may be understood as information generated when there is displacement transformation between the microphone and the audio.
In this embodiment, when the adjustment information is not received, a period of time may be waited to trigger the step S201. By implementing this embodiment, the accuracy of the adjustment and control of the acoustic gain can be improved, and the output effect of the acoustic system can be improved (for the reason, refer to the description part of the preset time in example 1).
S204, judging whether the adjustment information is volume adjustment information, if so, executing a step S205; if not, go to step S207.
In this embodiment, the determination method is not limited at all, and includes, but is not limited to, detecting the encoding mode of the adjustment information, the standard used by the information, and the like.
S205, judging whether the audio adjusting amplitude included in the volume adjusting information is larger than a preset first adjusting amplitude, if so, executing a step S206; if not, the flow is ended.
In this embodiment, the audio adjustment amplitude may be understood as the volume adjustment size.
In this embodiment, the first adjustment amplitude is used to detect whether the audio adjustment amplitude is valid.
As an optional implementation manner, when the audio adjustment amplitude included in the volume adjustment information is not greater than the preset first adjustment amplitude, the method further includes:
the acoustic gain value is adjusted to the initial gain value.
By implementing the embodiment, a resetting means of the acoustic gain value can be provided, thereby improving the comprehensiveness of the method, ensuring that when the absence of the acoustic howling is determined artificially, the acoustic howling can be regulated by artificial operation without the need of the acoustic howling suppression.
And S206, increasing the acoustic gain value according to the second adjustment parameter included in the volume adjustment information, and ending the process.
In this embodiment, the second adjustment parameter may be understood as an adjustment requirement for the acoustic gain value.
S207, judging whether the adjustment information is signal strength change information, if so, executing a step S208; if not, the flow is ended.
In this embodiment, the signal strength (RSSI) may be calculated when the wireless receiver performs demodulation, and is used to determine the link quality, and the distance between the transmitting point and the receiving point may be determined according to the received signal strength. In baseband demodulation, after passing through a baseband receiving filter, performing baseband IQ power integration in 104us to obtain the instantaneous value of RSSI (instantaneous) ═ sum (I ^2+ Q ^ 2); then, the instantaneous values of 8192 RSSIs are averaged over about 1 second to obtain an average value of the RSSIs, i.e., RSSI (average) ═ sum (RSSI (instantaneous))/8192. The RSSI (average) can be used to determine the change of signal strength per second.
In this embodiment, the determination method is not limited at all.
S208, judging whether the signal intensity change amplitude included in the signal intensity change information is larger than a preset second adjustment amplitude, if so, executing a step S209; if not, the flow is ended.
As an optional implementation manner, when the signal strength variation information includes a signal strength variation amplitude not greater than a preset second adjustment amplitude, the method further includes:
the acoustic gain value is adjusted to the initial gain value.
By implementing the embodiment, a resetting means of the acoustic gain value can be provided, thereby improving the comprehensiveness of the method, ensuring that when the absence of the acoustic howling is determined artificially, the acoustic howling can be regulated by artificial operation without the need of the acoustic howling suppression.
S209, the acoustic gain value is adjusted to be higher according to the third adjustment parameter included in the signal strength change information, and the process is ended.
In this embodiment, the third adjustment parameter may be understood as an adjustment requirement for the acoustic gain value.
S210, reducing an acoustic gain value of the sound system according to a preset first adjusting parameter.
In this embodiment, the first adjustment parameter may be understood as an adjustment requirement for the acoustic gain value based on howling suppression.
For example, referring to fig. 5, fig. 5 is a schematic flowchart of an acoustic gain control method when an acoustic gain is a link gain according to an embodiment of the present application. As can be seen from fig. 5, in the method, it is determined preferentially whether howling occurs, and when howling does not occur, it is determined whether gain adjustment caused by howling is included in the sound system, where the howling may be caused by volume increase or proximity of a microphone and a sound; when the method detects the existence of the acoustic howling, the link gain is adjusted downwards, and the adjustment quantity can be dG0The dG of0The method can be used as a module parameter to be configured into 1 dB-3 dB, so that the loop gain can be limited within the range of no howling; if the gain is limited on the link (G)<0dB), the volume is down-regulated dG1At this time, the limitation on the loop gain can be released, and G is adjusted up by dG1(second adjustment parameter), dG1Can be configured as module parameters and is configured to be 1 dB-3 d; if the RSSI indicates that the distance between the transmitting end and the receiving end is increased, the limitation on the link gain can be released, G is adjusted upwards, and the up-regulation quantity is dG2(third adjustment parameter), dG2The module can be configured as a module parameter and is configured to be 1 dB-3 dB. By such movementThe state control method can keep the loop gain in a relatively stable state where no howling occurs. A gain hold time (the above-mentioned preset time) is required after each gain adjustment, and the loop is waited for to stabilize, and the gain is kept unchanged in the time.
In this embodiment, reference may be made to fig. 6, which is a schematic diagram of an actual flow of an acoustic gain control method when an acoustic gain is a trap gain according to an embodiment of the present application, and when the acoustic gain is the trap gain, the method may be described with reference to the flow of fig. 6 and the above example.
For example, when the acoustic gain is a trap gain, the trap gain may be a trap depth. In practice, the number of the wave traps can be set to be N, the depth of the wave traps can be automatically adjusted, if howling occurs at a certain frequency point, if the frequency point wave trap does not exist, the frequency of the wave traps is configured to be the frequency of the howling frequency point, and the depth of the wave traps is set to be-dG0Otherwise, adjusting the depth of the existing trap of the howling frequency point, and adjusting down dG on the original basis0If the volume is adjusted downwards or the RSSI is reduced, all the wave traps are adjusted upwards in depth, and the time of the adjustment is not more than 0 dB.
It can be seen that, by implementing the acoustic gain control method based on the sound system described in fig. 2, it is possible to detect whether a howling occurs under the current conditions, and if the howling does not occur, it is determined whether the howling does not exist all the way or whether the howling exists before but is suppressed, and this method detects whether volume adjustment information or distance adjustment information is received when the howling exists before and is suppressed, and adjusts an acoustic gain value in the sound system when one of the two information is received (where the acoustic gain value is adjusted to suppress the howling), thereby implementing a method of adjusting the acoustic gain according to the actual conditions, and further, on the basis of adjusting the acoustic gain, it is possible to effectively ensure a high audio output effect.
Example 3
Referring to fig. 3, fig. 3 is a schematic structural diagram of an acoustic gain control device based on a sound system according to an embodiment of the present application. Wherein, this acoustic gain regulation and control device based on sound system includes:
a detecting unit 310, configured to detect whether a howling exists in the sound system according to a preset detection method;
a determining unit 320, configured to determine whether an acoustic gain value of the sound system is smaller than a preset initial gain value when there is no howling in the sound system;
the detecting unit 310 is further configured to detect whether the adjustment information is received when the acoustic gain value is smaller than the initial gain value; the acoustic gain value is smaller than the initial gain value and is used for indicating that the acoustic howling in the sound system is suppressed;
an adjusting unit 330, configured to adjust the acoustic gain value according to the adjustment information when the adjustment information is detected.
In this embodiment, the explanation and explanation of the acoustic gain control device based on the sound system in any of the above embodiments may be referred to, and details are not repeated in this embodiment.
It can be seen that, with the acoustic gain control device based on the sound system described in fig. 3, the acoustic gain control device based on the sound system can be triggered to perform corresponding adjustment of the acoustic gain value through the combination of the detection unit, the determination unit, and the adjustment unit, so as to ensure that the sound system can adjust the acoustic gain according to the actual situation, and further, on the basis of adjusting the acoustic gain, a higher audio output effect can be effectively ensured.
Example 4
Referring to fig. 4, fig. 4 is a schematic structural diagram of another acoustic gain control device based on an acoustic system according to an embodiment of the present application. The structural diagram of the acoustic gain control device based on the sound system depicted in fig. 4 is modified according to the structural diagram of the acoustic gain control device based on the sound system depicted in fig. 3. Wherein, this acoustic gain regulation and control device based on sound system includes:
a detecting unit 310, configured to detect whether a howling exists in the sound system according to a preset detection method;
a determining unit 320, configured to determine whether an acoustic gain value of the sound system is smaller than a preset initial gain value when there is no howling in the sound system;
the detecting unit 310 is further configured to detect whether the adjustment information is received when the acoustic gain value is smaller than the initial gain value; the acoustic gain value is smaller than the initial gain value and is used for indicating that the acoustic howling in the sound system is suppressed;
an adjusting unit 330, configured to adjust the acoustic gain value according to the adjustment information when the adjustment information is detected.
As an alternative embodiment, the adjusting unit 330 is further configured to, when there is a howling in the sound system, decrease an acoustic gain value of the sound system according to a preset first adjusting parameter.
As an alternative embodiment, the adjusting unit 330 may include:
a judging subunit 331, configured to, when the adjustment information is detected, judge whether the adjustment information is volume adjustment information;
the determining subunit 331 is further configured to determine, when the adjustment information is volume adjustment information, whether an audio adjustment amplitude included in the volume adjustment information is greater than a preset first adjustment amplitude;
the adjusting subunit 332 is configured to, when the audio adjusting amplitude is greater than the first adjusting amplitude, increase the acoustic gain value according to a second adjusting parameter included in the volume adjusting information.
As an alternative embodiment, the preset detection method includes a detection method based on the peak even harmonic power ratio and a detection method based on the inter-frame peak value holding degree.
As an alternative embodiment, the acoustic gain comprises an acoustic feedback loop gain based on the sound system and/or a trap gain based on the sound system.
As an alternative embodiment, the adjusting unit 330 may include:
the determining subunit 331, configured to determine, when the adjustment information is detected, whether the adjustment information is signal strength change information;
the determining subunit 331 is further configured to determine, when the adjustment information is signal strength change information, whether a signal strength change amplitude included in the signal strength change information is greater than a preset second adjustment amplitude;
the adjusting subunit 332 is further configured to, when the signal strength variation amplitude is greater than the second adjustment amplitude, increase the acoustic gain value according to a third adjustment parameter included in the signal strength variation information.
As an alternative embodiment, the detecting unit 310 is further configured to trigger the detecting unit 310 to perform an operation of detecting whether there is a howling in the sound system according to a preset detection method when the adjustment information is not detected.
In this embodiment, the explanation and explanation of the acoustic gain control device based on the sound system in any of the above embodiments may be referred to, and details are not repeated in this embodiment.
Please refer to fig. 7, which is a schematic structural diagram of an acoustic gain control apparatus based on an acoustic system according to an embodiment of the present application. Wherein the acoustic gain control apparatus comprises a volume adjuster 410, an adjusting device 420 comprising a gain controller or a dynamic trap, a signal strength detector 430 and a howling detector 440, wherein the acoustic gain control apparatus is applied in a sound system, the sound system further comprises a demodulator 450, a digital-to-analog converter 460 and an audio outputter 470.
It can be seen that, with the acoustic gain control device based on the sound system described in fig. 4, the acoustic gain control device based on the sound system can be triggered to perform corresponding adjustment of the acoustic gain value through the combination of the detection unit, the determination unit, and the adjustment unit, so as to ensure that the sound system can adjust the acoustic gain according to the actual situation, and further, on the basis of adjusting the acoustic gain, a higher audio output effect can be effectively ensured.
An embodiment of the present application provides an electronic device, including a memory and a processor, where the memory is used to store a computer program, and the processor runs the computer program to make the computer device execute an acoustic gain control method based on a sound system according to any one of embodiment 1 or embodiment 2 of the present application.
An embodiment of the present application provides a computer-readable storage medium, which stores computer program instructions, and when the computer program instructions are read and executed by a processor, the computer program instructions execute any one of the acoustic gain control methods according to embodiment 1 or embodiment 2 of the present application based on an acoustic system.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Claims (10)
1. An acoustic gain control method based on a sound system, comprising:
detecting whether a howling exists in the sound system or not by taking a preset detection method as a basis;
when no acoustic whistle exists in the sound system, judging whether the acoustic gain value of the sound system is smaller than a preset initial gain value;
when the acoustic gain value is smaller than the initial gain value, detecting whether adjustment information is received; the acoustic gain value is smaller than the initial gain value and is used for indicating that the howling in the sound system is suppressed;
and when the adjustment information is detected, adjusting the acoustic gain value according to the adjustment information.
2. The method of claim 1, further comprising:
and when the acoustic system has acoustic whistle, reducing the acoustic gain value of the acoustic system according to a preset first adjusting parameter.
3. The method of claim 1, wherein the step of adjusting the acoustic gain value according to the adjustment information when the adjustment information is detected comprises:
when the adjustment information is detected, judging whether the adjustment information is volume adjustment information or not;
when the adjustment information is the volume adjustment information, judging whether the audio adjustment amplitude included in the volume adjustment information is larger than a preset first adjustment amplitude;
and when the audio adjusting amplitude is larger than the first adjusting amplitude, the acoustic gain value is increased according to a second adjusting parameter included in the volume adjusting information.
4. The method of claim 1, wherein the step of adjusting the acoustic gain value according to the adjustment information when the adjustment information is detected comprises:
when the adjustment information is detected, judging whether the adjustment information is signal strength change information or not;
when the adjustment information is the signal strength change information, judging whether the signal strength change amplitude included in the signal strength change information is larger than a preset second adjustment amplitude or not;
and when the signal intensity change amplitude is larger than the second adjustment amplitude, increasing the acoustic gain value according to a third adjustment parameter included in the signal intensity change information.
5. The method of claim 1, further comprising:
and when the adjustment information is not detected, triggering and executing the step of detecting whether the sound system has the howling or not based on a preset detection method.
6. The acoustic gain control method based on the sound system according to claim 1, wherein the preset detection method comprises a detection method based on a peak even harmonic power ratio and a detection method based on an inter-frame peak value holding degree.
7. The sound system based acoustic gain conditioning method of claim 1, wherein the acoustic gain comprises a sound system based acoustic feedback loop gain and/or a sound system based trap gain.
8. An acoustic gain control device based on a sound system, the acoustic gain control device based on the sound system comprising:
the detection unit is used for detecting whether the acoustic system has acoustic howling or not according to a preset detection method;
the judging unit is used for judging whether the acoustic gain value of the sound system is smaller than a preset initial gain value or not when no acoustic whistle exists in the sound system; the acoustic gain value is smaller than the initial gain value and is used for indicating that the howling in the sound system is suppressed;
the detection unit is further configured to detect whether adjustment information is received when the acoustic gain value is smaller than the initial gain value;
and the adjusting unit is used for adjusting the acoustic gain value according to the adjusting information when the adjusting information is detected.
9. An electronic device, characterized in that the electronic device comprises a memory for storing a computer program and a processor for executing the computer program to cause the computer device to perform the sound system based acoustic gain controlling method according to any one of claims 1 to 7.
10. A readable storage medium having stored thereon computer program instructions which, when read and executed by a processor, perform the method for acoustic gain control based on a sound system according to any one of claims 1 to 7.
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| CN114640925B (en) * | 2022-03-02 | 2023-10-03 | 广州市迪声音响有限公司 | Dynamic gain equalization system and method for sound equipment |
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