CN115720317A - Audio signal squeaking detection and suppression method and device - Google Patents
Audio signal squeaking detection and suppression method and device Download PDFInfo
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- CN115720317A CN115720317A CN202211588284.1A CN202211588284A CN115720317A CN 115720317 A CN115720317 A CN 115720317A CN 202211588284 A CN202211588284 A CN 202211588284A CN 115720317 A CN115720317 A CN 115720317A
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Abstract
The embodiment of the application relates to the technical field of audio signal processing, in particular to an audio signal howling detection and suppression method and device, wherein the method comprises the following steps: acquiring a first audio signal input at the current moment, and acquiring a first frequency spectrum signal of a frequency domain according to the first audio signal; detecting the first spectrum signal and acquiring a howling frequency point; reducing the frequency spectrum amplitude corresponding to the howling frequency point to a first amplitude value; acquiring a second audio signal input at the next moment, and acquiring a second frequency spectrum signal of a frequency domain according to the second audio signal; if the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal is larger than the first amplitude value, the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal is adjusted up to a preset spectrum amplitude value. Through the above manner, the embodiment of the application realizes the howling suppression and improves the accuracy of the howling suppression.
Description
Technical Field
The embodiment of the application relates to the technical field of audio signal processing, in particular to an audio signal howling detection and suppression method and device.
Background
In the multimedia technology field, the audio signal processing technology needs to be applied to various electronic devices, and when the sound emitted by a sound emitting unit of the electronic device is picked up by a microphone, self-excitation amplification of the sound is generated, so that a howling phenomenon is generated. Noise caused by the howling phenomenon may degrade user experience and even impair the user's hearing.
The inventor finds that howling detection and suppression on an audio signal is an important link in audio processing, and in the prior art, whether howling occurs is generally determined by a method for detecting the howling on an acquired audio signal, but the sound similar to the howling in the environment is often mistakenly determined as the howling generated by self-excitation of an electronic equipment system. When howling suppression is performed based on such a misjudgment result, the user experience is inevitably adversely affected.
Disclosure of Invention
In view of the foregoing problems, embodiments of the present application provide an audio signal howling detection and suppression method, apparatus, and storage medium, so as to solve the problem in the prior art that howling can be effectively detected and suppressed.
According to an aspect of an embodiment of the present application, there is provided an audio signal howling detection and suppression method, including: acquiring a first audio signal input at the current moment, and acquiring a first frequency spectrum signal of a frequency domain according to the first audio signal; detecting the first spectrum signal and acquiring a howling frequency point; reducing the frequency spectrum amplitude corresponding to the howling frequency point to a first amplitude value; acquiring a second audio signal input at the next moment, and acquiring a second frequency spectrum signal of a frequency domain according to the second audio signal; if the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal is larger than the first amplitude value, the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal is adjusted up to a preset spectrum amplitude value.
In an optional manner, the method further comprises: if the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal is smaller than or equal to the first amplitude value, the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal is down-regulated to a preset second amplitude value, and the second amplitude value is smaller than the first amplitude value.
In an optional manner, the detecting the first spectrum signal and acquiring a howling frequency point includes: and determining the howling frequency point according to the peak-to-average power ratio (PAPR), the Peak Harmonic Power Ratio (PHPR) and/or the peak adjacent power ratio (PNPR).
In an optional manner, the determining the howling frequency point according to the PAPR, the PHPR, and/or the PNPR includes: determining a first candidate howling frequency point of the first spectrum signal according to the peak adjacent power ratio PNPR; analyzing and screening the first candidate howling frequency point according to the PAPR to obtain a second candidate howling frequency point; and analyzing and screening the second candidate howling frequency point according to the peak harmonic power ratio PHPR to obtain the howling frequency point.
In an optional manner, the acquiring a first audio signal input at a current time and acquiring a first spectrum signal of a frequency domain according to the first audio signal includes: acquiring a first audio signal input at the current moment; windowing the first audio signal according to a window function to obtain a windowed first audio signal; performing Fourier transform on the windowed first audio signal to obtain a first frequency spectrum signal;
the acquiring a second audio signal input at a next moment and acquiring a second spectrum signal of a frequency domain according to the second audio signal includes: acquiring a second audio signal input at the next moment; windowing the second audio signal according to a window function to obtain a windowed second audio signal; and carrying out Fourier change on the windowed second audio signal to obtain the second frequency spectrum signal.
In an optional manner, the down-regulating the spectrum amplitude corresponding to the howling frequency point to a first amplitude value includes: and adjusting the frequency spectrum signal corresponding to the howling frequency point according to a preset proportion to enable the frequency spectrum amplitude corresponding to the howling frequency point to be reduced to a first amplitude value.
In an optional manner, if the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal is greater than the first amplitude value, the adjusting the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal to a preset spectrum amplitude value includes: if the ratio of the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal to the spectrum amplitude corresponding to the howling frequency point in the first spectrum signal is greater than the preset ratio, the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal is adjusted to a preset spectrum amplitude value by adjusting the spectrum signal corresponding to the howling frequency point in the second spectrum signal.
According to another aspect of the embodiments of the present application, there is provided an audio signal howling detection and suppression apparatus, including: the first acquisition module is used for acquiring a first audio signal input at the current moment and acquiring a first frequency spectrum signal of a frequency domain according to the first audio signal; the second acquisition module is used for detecting the first frequency spectrum signal and acquiring a howling frequency point; the first adjusting module is used for reducing the frequency spectrum amplitude corresponding to the howling frequency point to a first amplitude value; the third acquisition module is used for acquiring a second audio signal input at the next moment and acquiring a second frequency spectrum signal of a frequency domain according to the second audio signal; and the second adjusting module is configured to, if the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal is greater than the first amplitude value, up-adjust the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal to a preset spectrum amplitude value.
According to another aspect of embodiments of the present application, there is provided an audio signal howling detection and suppression apparatus, including: the system comprises a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface are communicated with each other through the communication bus; the memory is configured to store at least one executable instruction that causes the processor to perform the operations of the audio signal howling detection and suppression method as described above.
According to a further aspect of embodiments of the present application, there is provided a computer-readable storage medium having stored therein executable instructions for causing an audio signal howling detection and suppression apparatus to perform operations corresponding to the method as described above.
According to the embodiment of the application, a first audio signal input by a hearing aid at the current moment is obtained, the first audio signal in a time domain is converted into a first frequency spectrum signal in a frequency domain, the first frequency spectrum signal is analyzed and detected, a howling frequency point is obtained, the frequency spectrum amplitude corresponding to the howling frequency point is adjusted downwards to a first amplitude value, namely, the playing volume of howling noise corresponding to the howling frequency point is adjusted downwards, a second audio signal input by the hearing aid at the next moment is obtained, the second audio signal in the time domain is converted into a second frequency spectrum signal in the frequency domain, if the frequency spectrum amplitude corresponding to the howling frequency point in the second frequency spectrum signal is larger than the first amplitude value at the moment, the howling noise is caused by the audio signal in the external environment, the frequency spectrum amplitude corresponding to the howling frequency point in the second frequency spectrum signal is adjusted upwards to a preset frequency spectrum amplitude, a user can normally listen to the audio signal in the external environment, and the accuracy of the howling suppression is improved.
The foregoing description is only an overview of the technical solutions of the embodiments of the present application, and the embodiments of the present application can be implemented according to the content of the description in order to make the technical means of the embodiments of the present application more clearly understood, and the detailed description of the present application is provided below in order to make the foregoing and other objects, features, and advantages of the embodiments of the present application more clearly understandable.
Drawings
The drawings are only for purposes of illustrating embodiments and are not to be construed as limiting the application. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 illustrates a flow chart of an audio signal howling detection and suppression method provided in an embodiment of the present application;
fig. 2 is a schematic diagram illustrating a process of acquiring a first spectrum signal howling frequency point;
FIG. 3 shows a flow diagram of sub-steps of step 110 of FIG. 1;
FIG. 4 shows a flow diagram of sub-steps of step 140 of FIG. 1;
fig. 5 is a schematic structural diagram illustrating an audio signal howling detection and suppression apparatus provided in an embodiment of the present application;
fig. 6 shows a schematic structural diagram of an audio signal howling detection and suppression device provided in an embodiment of the present application.
Detailed Description
Exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present application are shown in the drawings, it should be understood that the present application may be embodied in various forms and should not be limited to the embodiments set forth herein.
At present, along with the development of science and technology, various electronic devices come into operation, great convenience is brought to the life of people, and the quality of life is improved. However, electronic devices including a microphone and a speaker are prone to howling caused by self-excitation of energy due to problems such as too close distance between the microphone and the speaker. Electronic devices comprising, for example, a microphone and a loudspeaker, include: hearing aids, stereos, or walkie talkies, etc. In the present application, a hearing aid is taken as an example, and the present inventors have noticed that howling occurs in a process in which sound emitted from a speaker of the hearing aid is picked up and amplified by a microphone and then emitted from the speaker again and is continuously circulated. In addition, if there is a howling noise in the audio signal of the external environment, the hearing aid may also have a howling noise when receiving the audio signal of the external environment. Howling noise generated by self-excitation of a microphone and a loudspeaker in a hearing aid degrades user experience and even impairs the hearing of a user, and thus howling detection and suppression are required. However, as for the howling noise caused by the audio signal of the external environment, since the howling noise is a real audio signal of the external environment, the audio signal of the external environment needs to be truly reflected to the user of the hearing aid, and therefore the howling noise caused by the audio signal of the external environment does not need to be suppressed.
The inventor of the present application finds that, in the prior art, when a hearing aid detects that howling noise exists in an audio signal input by a microphone at the current time, howling suppression is realized by reducing the playing volume of the audio signal of a speaker, and the cause of the howling is not analyzed, so that the control mode is relatively simple. However, in practice, if the howling noise is caused by an audio signal of the external environment, such as a harsh whistle sound emitted by an automobile, the howling noise should not be suppressed, but the user of the hearing aid listens to the audio signal of the external environment, but the howling suppression is realized by reducing the playing volume of the speaker after the howling noise is detected in the prior art, and the source of the howling noise is not analyzed, so that the user normally listens to the audio signal of the external environment at the next moment, and the use of the user is greatly influenced.
Therefore, in order to reduce erroneous judgment and improve the accuracy of howling suppression, the inventor of the present application has studied and proposed a method for detecting and suppressing howling of an audio signal, which includes determining a frequency point at which howling occurs, adjusting a spectrum amplitude corresponding to the frequency point at which the howling occurs, then comparing an adjusted audio signal with an actual amplitude value of the audio signal at a next time by obtaining the audio signal at the next time, and further determining whether the adjustment is valid, wherein if the adjustment is invalid, it is indicated that a main source of the howling occurring in the current audio signal is an external environment, and in order to reflect real environmental information, the audio signal corresponding to the adjusted howling frequency point is restored without adjustment. By the method, the source of the howling can be accurately distinguished, so that the howling is accurately controlled, the accuracy of the howling inhibition is improved, the audio signal can reflect real external environment information more truly, and the influence on users is avoided.
The audio signal howling detection and suppression method disclosed by the embodiment of the application can be used in hearing aids, and can also be used in other electronic devices which are easy to generate howling phenomenon due to self-excitation of energy caused by problems such as too close distance between a microphone and a loudspeaker. The embodiments of the present application are described only by way of example of a hearing aid and are not to be considered as applying only to hearing aids.
Fig. 1 shows a flowchart of an audio signal howling detection and suppression method provided by an embodiment of the present application. As shown in fig. 1, the method comprises the steps of:
step 110: the method comprises the steps of obtaining a first audio signal input at the current moment, and obtaining a first frequency spectrum signal of a frequency domain according to the first audio signal.
The howling noise mainly has two sources, one is that the sound played by the loudspeaker of the hearing aid is picked up and amplified by the microphone of the hearing aid, and then played from the loudspeaker again and continuously circulated, so that the howling noise is generated; the other is that when the microphone of the hearing aid acquires the audio signal of the external environment, the audio signal of the external environment has howling noise. Therefore, by acquiring the first audio signal input by the microphone at the current moment, the howling noise in the first audio signal can be analyzed and acquired. Since the first audio signal is a time domain signal, the analysis processing is facilitated by converting the first audio signal into a first spectrum signal.
Specifically, when the hearing aid is in an operating state, a first audio signal input by the hearing aid at the current time may be acquired and acquired through a microphone, and the first audio signal is stored in a storage area, and the hearing aid acquires the first audio signal by reading data in the storage area, and obtains a first spectrum signal by performing fourier transform on the first audio signal or performing fourier transform on the first audio signal after performing windowing processing, and the like.
Step 120: and detecting the first spectrum signal and acquiring a howling frequency point.
The first spectrum signal comprises a plurality of frequency points, the frequency points with howling in the first spectrum signal are obtained, the spectrum signals corresponding to the howling frequency points can be directly processed, and the spectrum signals corresponding to other non-howling frequency points are not howling noise signals and do not need to be processed, so that the accuracy of howling suppression is further improved. Because the power or energy of the howling frequency point is very high and far exceeds that of other voice or noise frequency points, the howling frequency point can be obtained by analyzing the power or energy of each frequency point in the first spectrum signal. For example, the howling frequency point may be determined according to the peak-to-average power ratio PAPR, the peak harmonic power ratio PHPR, and/or the peak adjacent power ratio PNPR, which is not limited in this step.
Step 130: and reducing the spectrum amplitude corresponding to the howling frequency point to a first amplitude value.
The acquired frequency spectrum signal corresponding to the audio signal often has a plurality of frequency points, and after the howling frequency point of the first frequency spectrum signal is acquired through detection and analysis, the frequency spectrum amplitude corresponding to the howling frequency point is adjusted to be the first amplitude value, so that the playing volume of howling noise is reduced, and howling suppression is realized. In this step, only the spectrum amplitude corresponding to the howling frequency point is adjusted down to the first amplitude value, that is, only the playing volume of the howling noise in the first audio signal is reduced, but the playing volume of the audio signals without other non-howling noises is not reduced, so that the user can still normally listen to the audio signals without other non-howling noises while suppressing the howling noises.
In some embodiments, the first amplitude value may be predetermined, or may be a spectrum amplitude that is scaled down to the first amplitude value. Preferably, the frequency spectrum amplitude corresponding to the howling frequency point is adjusted to be half of the original frequency spectrum amplitude, so that the playing volume of the howling noise is adjusted to be half of the original playing volume, and therefore, if the howling noise is generated by self-excitation of a microphone and a loudspeaker of the hearing aid, the playing volume of the howling noise is adjusted downward, and adverse effects of the howling noise on a user are reduced; if the howling noise is caused by the audio signal of the external environment, the user can still hear the howling noise because the playing volume of the howling noise is only adjusted downwards, and the user cannot completely miss the real audio signal of the external environment.
Step 140: and acquiring a second audio signal input at the next moment, and acquiring a second frequency spectrum signal of a frequency domain according to the second audio signal.
If the howling noise is generated at the current moment because the audio signal played by the loudspeaker of the hearing aid is picked up and amplified by the microphone and then played again from the loudspeaker and the process is continuously circulated, after the howling noise in the audio signal played by the loudspeaker at the current moment is suppressed, when the hearing aid plays the audio signal again at the next moment, the howling noise in the audio signal played by the loudspeaker picked up by the microphone is suppressed, and the howling noise in the audio signal played by the loudspeaker is also suppressed. If the howling noise at the current moment is caused by the audio signal of the external environment, the howling noise caused by the audio signal of the external environment at the next moment cannot be suppressed by adjusting the spectrum amplitude corresponding to the howling frequency point in the first spectrum signal, and the user of the hearing aid is enabled to normally listen to the real audio signal of the external environment instead of suppressing the howling noise in the audio signal of the external environment.
Therefore, after the second audio signal input by the microphone of the hearing aid at the next moment is obtained and the time-domain second audio signal is converted into the frequency-domain second spectrum signal, the howling noise corresponding to the howling frequency point can be judged whether the howling noise is caused by the self-excitation of the microphone and the loudspeaker of the hearing aid or the audio signal of the external environment by analyzing the spectrum signal corresponding to the howling frequency point in the second spectrum signal, so that whether the howling suppression needs to be continued or the spectrum amplitude corresponding to the howling frequency point is adjusted upwards so as to enable the user to normally listen to the audio signal of the external environment.
Specifically, after the hearing aid acquires the first audio signal, the second audio signal at the next time may be acquired according to a time interval as needed, and the acquisition manners of the second audio signal and the second spectrum signal may be the same as the acquisition manners of the first audio signal and the first spectrum signal, and the acquisition manners of the first audio signal and the first spectrum signal have been described in step 110, so the acquisition manners of the second audio signal and the second spectrum signal may refer to step 110, and are not described herein again.
Step 150: and judging whether the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal is larger than the first amplitude value.
In this step, the frequency spectrum amplitude value corresponding to the howling frequency point in the second frequency spectrum signal is determined, and if the frequency spectrum amplitude corresponding to the howling frequency point is greater than the first amplitude value, the process goes to step 160; if the spectrum amplitude corresponding to the howling frequency point is less than or equal to the first amplitude value, go to step 170. It should be noted that the howling frequency point in the second spectrum signal and the howling frequency point in the first spectrum signal are the same frequency point.
Step 160: and the frequency spectrum amplitude corresponding to the howling frequency point in the second frequency spectrum signal is adjusted to a preset frequency spectrum amplitude value.
Since the frequency spectrum amplitude corresponding to the howling frequency point in the first frequency spectrum signal is down-regulated to the first amplitude value in step 130, it can be determined whether the howling noise corresponding to the howling frequency point is generated by self-excitation of a microphone and a speaker of the hearing aid or is brought by an audio signal of an external environment by determining the frequency spectrum amplitude value corresponding to the howling frequency point in the second frequency spectrum signal. If the howling noise corresponding to the howling frequency point is generated by self-excitation of a microphone and a loudspeaker of the hearing aid, adjusting the spectrum amplitude corresponding to the howling frequency point of the first spectrum signal, and then correspondingly reducing the spectrum amplitude corresponding to the howling frequency point of the second spectrum signal at the next moment; on the contrary, if the howling noise corresponding to the howling frequency point is caused by the audio signal of the external environment, the spectrum amplitude corresponding to the howling frequency point of the second spectrum signal at the next moment cannot be correspondingly reduced.
Therefore, if the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal is greater than the first amplitude value, that is, the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal is not correspondingly reduced, it is indicated that the howling noise corresponding to the howling frequency point is caused by the audio signal of the external environment, and therefore, the howling noise does not need to be suppressed, the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal needs to be increased to a preset spectrum amplitude, so that the user can normally listen to the second audio signal. The preset frequency spectrum amplitude is larger than the first amplitude value and can be set as required.
It can be known from the foregoing embodiment that, after a first audio signal input by the hearing aid at the current moment is acquired, and a first frequency spectrum signal in a frequency domain is acquired according to the first audio signal, the first frequency spectrum signal is analyzed and detected to acquire a howling frequency point, howling suppression is realized by lowering a frequency spectrum amplitude corresponding to the howling frequency point to a first amplitude value, and then a second audio signal input by the hearing aid at the next moment is acquired, and after a second frequency spectrum signal in the frequency domain is acquired according to the second audio signal, a source of the howling noise is determined according to a magnitude relation between the frequency spectrum amplitude corresponding to the howling frequency point in the second frequency spectrum signal and the first amplitude value. If the spectral amplitude corresponding to the howling frequency point in the second spectral signal is greater than the first amplitude value, it is indicated that the howling noise is caused by the audio signal of the external environment, and therefore the spectral amplitude corresponding to the howling frequency point in the second spectral signal is adjusted up to the preset spectral amplitude value, so that the user of the hearing aid can normally listen to the audio signal of the external environment. The problem that in the prior art, after the howling noise is detected at the current moment and howling suppression is carried out, the source of the howling noise is not analyzed and confirmed further, and whether the howling noise needs to be suppressed or not is confirmed according to the source of the howling noise is solved.
In order to further suppress the howling noise generated by the self-excitation of the microphone and the speaker of the hearing aid and improve the user experience, in some embodiments, when the determination in step 150 of fig. 1 is no, the method performs the following steps:
step 170: and reducing the frequency spectrum amplitude corresponding to the howling frequency point in the second frequency spectrum signal to a preset second amplitude value, wherein the second amplitude value is smaller than the first amplitude value.
In this embodiment of the application, since the spectrum amplitude corresponding to the howling frequency point in the first spectrum signal is down-regulated to the first amplitude value in step 130, if the howling noise corresponding to the howling frequency point is generated by self-excitation of a microphone and a speaker of the hearing aid, after the spectrum amplitude corresponding to the howling frequency point of the first spectrum signal is adjusted, the spectrum amplitude corresponding to the howling frequency point of the second spectrum signal at the next moment is correspondingly down-regulated. Therefore, after the spectrum amplitude corresponding to the howling frequency point in the first spectrum signal is adjusted to the first amplitude value, if the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal is smaller than or equal to the first amplitude value, it is indicated that the howling noise is generated by the self-excitation of the microphone and the loudspeaker of the hearing aid, and the playing volume of the howling noise is continuously adjusted downwards by continuously adjusting the spectrum amplitude corresponding to the howling frequency point to the second amplitude value, so that the howling noise is further suppressed, and the user experience is improved. The second amplitude value is smaller than the first amplitude value, and may be set as needed, which is not limited herein.
In order to accurately acquire the howling frequency point, in some embodiments, the step 120 of detecting the first spectrum signal and acquiring the howling frequency point includes:
and determining the howling frequency point according to the peak-to-average power ratio (PAPR), the Peak Harmonic Power Ratio (PHPR) and/or the peak adjacent power ratio (PNPR).
Because the power of the howling frequency point is far greater than the power of other non-howling frequency points, the average power of the first spectrum signal is calculated first, and then the ratio of the power of each frequency point in the first spectrum signal to the average power is calculated, so that if the peak-to-average power ratio (PAPR) of a certain frequency point is greater than a preset threshold, the frequency point can be determined to be the howling frequency point, wherein the preset threshold can be set as required.
Because the spectrum signal of the voice audio signal has harmonic peaks, and the spectrum signal corresponding to the howling noise does not include harmonic peaks, if the peak harmonic power ratio PHPR of a certain frequency point is greater than a preset threshold, the frequency point is determined to be a howling frequency point, wherein the preset threshold can be set as required.
And after determining a candidate howling frequency point according to the peak adjacent power ratio PNPR, determining whether the power of the candidate howling frequency point is higher than the powers of the left and right M adjacent frequency points, and if the condition is met, determining the candidate howling frequency point as the howling frequency point. Where M can be set as needed, and preferably, M is 5.
In the embodiment of the application, the howling frequency point has inherent characteristics compared with other non-howling frequency points, so that after all frequency points of the first spectrum signal are analyzed, the howling frequency point is screened and determined according to the inherent characteristics of the howling frequency point, and the accuracy of obtaining the howling frequency point is improved.
It should be noted that in the embodiment of the present application, the howling frequency point may be determined according to any one of a peak-to-average power ratio PAPR, a peak harmonic power ratio PHPR, or a peak adjacent power ratio PNPR, or may be determined by combining two or more manners, which is not limited herein.
In order to further improve the accuracy of obtaining the howling frequency point, in some embodiments, fig. 2 shows a schematic flow chart of obtaining the howling frequency point of the first spectrum signal, where the step of determining the howling frequency point according to the peak-to-average power ratio PAPR, the peak-to-harmonic power ratio PHPR, and/or the peak-to-adjacent power ratio PNPR includes:
step 121: and determining a first candidate howling frequency point of the first spectrum signal according to the peak adjacent power ratio PNPR.
In this step, after determining a candidate howling frequency point according to the peak adjacent power ratio PNPR, it is determined whether the power of the candidate howling frequency point is higher than the powers of the left and right M adjacent frequency points, and if the condition is satisfied, the candidate howling frequency point is determined as a first candidate howling frequency point. Wherein M can be set as required, and preferably, M is 5.
Step 122: and analyzing and screening the first candidate howling frequency point according to the peak-to-average power ratio (PAPR) to obtain a second candidate howling frequency point.
In this step, the average power of the first spectrum signal is calculated first, then the ratio of the power of the first candidate howling frequency point to the average power of the first spectrum signal is calculated, and if the PAPR of the peak-to-average power of the first candidate howling frequency point is greater than a preset threshold, the frequency point is determined to be a second candidate frequency point, where the preset threshold may be set as needed.
Step 123: and analyzing and screening the second candidate howling frequency point according to the peak harmonic power ratio PHPR to obtain the howling frequency point.
In this step, if the peak harmonic power ratio PHPR of the second candidate howling frequency point is greater than a preset threshold, it is determined that the second candidate frequency point is a howling frequency point, where the preset threshold may be set as needed.
In the embodiment of the application, all frequency points of a first spectrum signal are screened according to a peak-to-adjacent power ratio PNPR, a first candidate howling frequency point is screened out, the first candidate howling frequency point is screened out again according to a peak-to-average power ratio PAPR, a second candidate howling frequency point is screened out, finally the second candidate howling frequency point is screened out again according to a peak harmonic power ratio PHPR, and the howling frequency point is finally determined. The howling frequency point is determined after all frequency points of the first spectrum signal are analyzed and screened for three times by using three different modes, so that the accuracy of obtaining the howling frequency point is further improved.
To improve the effect and accuracy of howling suppression, in some embodiments, fig. 3 shows a flow chart of sub-steps of step 110 in fig. 1. As shown in fig. 3, in the step 110, acquiring a first audio signal input at the current time, and acquiring a first spectrum signal in a frequency domain according to the first audio signal, includes:
step 111: and acquiring a first audio signal input at the current moment.
The howling noise mainly has two sources, one is that the sound played by the loudspeaker of the hearing aid is picked up and amplified by the microphone of the electronic equipment, and then played again from the loudspeaker and continuously circulated, so that the howling noise is generated; the other is that when the microphone of the hearing aid acquires the audio signal of the external environment, the audio signal of the external environment carries howling noise. Therefore, by acquiring the first audio signal input by the microphone at the current moment, the howling noise in the first audio signal can be analyzed and acquired.
Step 112: and carrying out windowing processing on the first audio signal according to the window function to obtain the windowed first audio signal.
In particular, for a frame of short-time audio signal s at the current time t t Window processing is carried out to obtain sw t () In which the audio signal s t The length of (a) is N, w (N) is a window function, and the specific formula is as follows:
w (N) = sin ((N + 0.5) pi/N), where N =0,1,2, …, N-1;
sw t ()＝s t (N) · (N), where N =0,1,2, …, N-1.
Step 113: and carrying out Fourier transformation on the windowed first audio signal to obtain a first frequency spectrum signal.
Specifically, the sws after windowing t (n) discrete Fourier transform of the signal to obtain a first spectral signal
wherein Y is t (i) Are frequency domain coefficients in complex form.
Fig. 4 shows a flowchart of sub-steps of step 140 in fig. 1, and as shown in fig. 4, in step 140, acquiring a second audio signal input at a next time and acquiring a second spectrum signal in a frequency domain according to the second audio signal includes:
step 141: and acquiring a second audio signal input at the next moment.
In this step, after the hearing aid acquires the first audio signal, the hearing aid may acquire a second audio signal at a next time according to a time interval as needed, where the acquisition manner of the second audio signal may be the same as the acquisition manner of the first audio signal, and the acquisition manner of the first audio signal is described in step 111, so the acquisition manner of the second audio signal may refer to step 111, and is not described herein again.
Step 142: and carrying out windowing processing on the second audio signal according to the window function to obtain the windowed second audio signal.
In this step, the manner of performing windowing on the second audio signal may be the same as that of the first audio signal, and the manner of performing windowing on the first audio signal has already been described in step 112, so the manner of performing windowing on the second audio signal may refer to step 112, and is not described herein again.
Step 143: and carrying out Fourier change on the windowed second audio signal to obtain a second frequency spectrum signal.
In this step, the fourier transform of the windowed second audio signal may be performed in the same manner as the first audio signal, which may refer to step 113, and is not described herein again.
In the embodiment of the application, after the first audio signal and the second audio signal are subjected to windowing processing, the first spectrum signal and the second spectrum signal are obtained through Fourier change, so that the accuracy of obtaining the howling frequency point is improved, and the accuracy of howling suppression is improved.
In order to improve the efficiency of howling suppression, in some embodiments, the step 120 of down-regulating the spectrum amplitude corresponding to the howling frequency point to the first amplitude value includes:
the frequency spectrum amplitude corresponding to the howling frequency point is reduced to a first amplitude value by adjusting the frequency spectrum signal corresponding to the howling frequency point according to a preset proportion.
In the embodiment of the application, the efficiency of howling suppression is improved by adjusting the spectrum amplitude corresponding to the howling frequency point according to the preset proportion, preferably, the preset proportion is 1/2, that is, the playing volume of the howling noise corresponding to the howling frequency point in the first spectrum signal is reduced by 1/2.
In order to improve the accuracy of howling suppression and improve the user experience, in some embodiments, if the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal is greater than the first amplitude value, the step 150 up-regulates the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal to a preset spectrum amplitude value, including:
if the ratio of the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal to the spectrum amplitude corresponding to the howling frequency point in the first spectrum signal is greater than the preset ratio, the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal is adjusted to be the preset spectrum amplitude value.
In the embodiment of the application, if the howling noise corresponding to the howling frequency point is generated by self-excitation of a microphone and a loudspeaker of the hearing aid, after the spectrum amplitude corresponding to the howling frequency point of the first spectrum signal is adjusted, the spectrum amplitude corresponding to the howling frequency point of the second spectrum signal at the next moment is correspondingly adjusted downwards; on the contrary, if the howling noise corresponding to the howling frequency point is caused by the audio signal of the external environment, the spectrum amplitude corresponding to the howling frequency point of the second spectrum signal at the next moment cannot be correspondingly reduced.
Therefore, if the ratio of the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal to the spectrum amplitude corresponding to the howling frequency point in the first spectrum signal is greater than the preset ratio, that is, the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal is not correspondingly reduced, it is indicated that the howling noise corresponding to the howling frequency point is caused by the audio signal of the external environment, and therefore the howling noise does not need to be suppressed, the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal needs to be increased to the preset spectrum amplitude, so that the user can normally listen to the second audio signal. The preset frequency spectrum amplitude is larger than the first amplitude value and can be set as required.
According to another aspect of the embodiments of the present application, an apparatus for detecting and suppressing an audio signal howling is provided, and referring to fig. 2, a schematic structural diagram of the apparatus for detecting and suppressing an audio signal howling provided by the embodiments of the present application is shown. As shown in fig. 2, the apparatus 200 includes: a first obtaining module 201, a second obtaining module 202, a first adjusting module 203, a third obtaining module 204, and a second adjusting module 205.
A first obtaining module 201, configured to obtain a first audio signal input at a current time, and obtain a first frequency spectrum signal of a frequency domain according to the first audio signal;
a second obtaining module 202, configured to detect the first spectrum signal and obtain a howling frequency point;
the first adjusting module 203 is configured to down-regulate a spectrum amplitude corresponding to the howling frequency point to a first amplitude value;
a third obtaining module 204, configured to obtain a second audio signal input at a next moment, and obtain a second frequency spectrum signal of a frequency domain according to the second audio signal;
the second adjusting module 205 is configured to, if the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal is greater than the first amplitude value, up-adjust the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal to a preset spectrum amplitude value.
In the audio signal howling detection and suppression device 200 provided by the application, first, a first acquisition module 201 acquires a first audio signal input at the current time, acquires a first frequency spectrum signal of a frequency domain according to the first audio signal, and acquires a howling frequency point in the first frequency spectrum signal by a second acquisition module 202, and a first adjustment module 203 adjusts the frequency spectrum amplitude corresponding to the howling frequency point down to a first amplitude value, that is, adjusts the play volume of the howling noise corresponding to the howling frequency point down, thereby implementing howling suppression. The third obtaining module 204 obtains a second audio signal input at the next moment, and obtains a second frequency spectrum signal of a frequency domain according to the second audio signal, and the second adjusting module 205 determines a source of the howling noise according to a magnitude relation between a frequency spectrum amplitude corresponding to the howling frequency point in the second frequency spectrum signal and the first amplitude value. If the spectral amplitude corresponding to the howling frequency point in the second spectral signal is larger than the first amplitude value, it is indicated that the howling noise is caused by the audio signal of the external environment, and therefore the spectral amplitude corresponding to the howling frequency point in the second spectral signal is adjusted up to the preset spectral amplitude value, so that a user of the hearing aid can normally listen to the audio signal of the external environment, and the accuracy of howling suppression is improved.
In an alternative manner, the audio signal howling detection and suppression apparatus 200 further includes:
a third adjusting module, configured to down-regulate the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal to a preset second amplitude value if the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal is less than or equal to the first amplitude value, where the second amplitude value is less than the first amplitude value.
In an optional manner, the second obtaining module 202 is configured to determine the howling frequency point according to a peak-to-average power ratio PAPR, a peak harmonic power ratio PHPR, and/or a peak adjacent power ratio PNPR.
In an optional manner, the second obtaining module 202 is configured to determine a first candidate howling frequency point of the first spectrum signal according to the peak-to-adjacent power ratio PNPR; analyzing and screening the first candidate howling frequency point according to the peak-to-average power ratio (PAPR) to obtain a second candidate howling frequency point; and analyzing and screening the second candidate howling frequency point according to the peak harmonic power ratio PHPR to obtain the howling frequency point.
In an optional manner, the first obtaining module 201 is configured to obtain a first audio signal input at a current time; windowing the first audio signal according to a window function to obtain a windowed first audio signal; performing Fourier transform on the windowed first audio signal to obtain a first frequency spectrum signal; the third obtaining module 204 is configured to obtain a second audio signal input at a next moment; windowing the second audio signal according to a window function to obtain a windowed second audio signal; and carrying out Fourier change on the windowed second audio signal to obtain the second frequency spectrum signal.
In an optional manner, the first adjusting module 203 is configured to adjust the spectrum signal corresponding to the howling frequency point according to a preset ratio, so that the spectrum amplitude corresponding to the howling frequency point is reduced to a first amplitude value.
In an optional manner, the second adjusting module 205 is configured to, if a ratio of a spectrum amplitude corresponding to the howling frequency point in the second spectrum signal to a spectrum amplitude corresponding to the howling frequency point in the first spectrum signal is greater than the preset ratio, adjust the spectrum signal corresponding to the howling frequency point in the second spectrum signal to increase the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal to a preset spectrum amplitude value.
According to another aspect of the embodiments of the present application, an audio signal howling detection and suppression device is provided, and referring to fig. 3 specifically, a schematic structural diagram of the audio signal howling detection and suppression device provided in the embodiments of the present application is shown in the drawing, and the embodiments of the present application do not limit specific implementations of the audio signal howling detection and suppression device.
As shown in fig. 3, the audio signal howling detection and suppression apparatus may include: a processor (processor) 302, a communication Interface 304, a memory 306, and a communication bus 308.
Wherein: the processor 302, communication interface 304, and memory 306 communicate with each other via a communication bus 308. A communication interface 304 for communicating with network elements of other devices, such as clients or other servers. The processor 302 is configured to execute the program 310, and may specifically execute the relevant steps in the above embodiments of the method for detecting and suppressing a howling of an audio signal.
In particular, program 310 may include program code comprising computer-executable instructions.
The processor 302 may be a central processing unit CPU, or an Application Specific Integrated Circuit ASIC (Application Specific Integrated Circuit), or one or more Integrated circuits configured to implement embodiments of the present Application. The audio signal howling detection and suppression device comprises one or more processors, which may be the same type of processor, such as one or more CPUs; or may be different types of processors such as one or more CPUs and one or more ASICs.
A memory 306 for storing a program 310. Memory 306 may comprise high-speed RAM memory and may also include non-volatile memory (non-volatile memory), such as at least one disk memory.
Specifically, program 310 may be invoked by processor 302 to cause the audio signal howling detection and suppression device to perform the following operations:
acquiring a first audio signal input at the current moment, and acquiring a first frequency spectrum signal of a frequency domain according to the first audio signal;
detecting the first spectrum signal and acquiring a howling frequency point;
reducing the frequency spectrum amplitude corresponding to the howling frequency point to a first amplitude value;
acquiring a second audio signal input at the next moment, and acquiring a second frequency spectrum signal of a frequency domain according to the second audio signal;
if the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal is larger than the first amplitude value, the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal is adjusted up to a preset spectrum amplitude value.
According to another aspect of embodiments of the present application, there is provided a computer-readable storage medium storing executable instructions that, when run on an audio signal howling detection and suppression apparatus, cause the audio signal howling detection and suppression apparatus to perform an audio signal howling detection and suppression method in any of the above-described method embodiments.
The executable instructions may specifically be configured to cause the audio signal howling detection and suppression device to perform the following:
acquiring a first audio signal input at the current moment, and acquiring a first frequency spectrum signal of a frequency domain according to the first audio signal;
detecting the first spectrum signal and acquiring a howling frequency point;
reducing the frequency spectrum amplitude corresponding to the howling frequency point to a first amplitude value;
acquiring a second audio signal input at the next moment, and acquiring a second frequency spectrum signal of a frequency domain according to the second audio signal;
if the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal is larger than the first amplitude value, the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal is adjusted up to a preset spectrum amplitude value.
The executable instructions may also be for causing the audio signal howling detection and suppression device to:
if the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal is smaller than or equal to the first amplitude value, the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal is down-regulated to a preset second amplitude value, and the second amplitude value is smaller than the first amplitude value.
The detecting the first spectrum signal and acquiring the howling frequency point includes:
and determining the howling frequency point according to the peak-to-average power ratio (PAPR), the Peak Harmonic Power Ratio (PHPR) and/or the peak adjacent power ratio (PNPR).
The determining the howling frequency point according to the peak-to-average power ratio (PAPR), the Peak Harmonic Power Ratio (PHPR), and/or the peak adjacent power ratio (PNPR) includes:
determining a first candidate howling frequency point of the first spectrum signal according to the peak adjacent power ratio PNPR;
analyzing and screening the first candidate howling frequency point according to the peak-to-average power ratio (PAPR) to obtain a second candidate howling frequency point;
and analyzing and screening the second candidate howling frequency point according to the peak harmonic power ratio PHPR to obtain the howling frequency point.
The acquiring a first audio signal input at the current moment and acquiring a first spectrum signal of a frequency domain according to the first audio signal includes:
acquiring a first audio signal input at the current moment;
windowing the first audio signal according to a window function to obtain a windowed first audio signal;
performing Fourier transform on the windowed first audio signal to obtain a first frequency spectrum signal;
the acquiring a second audio signal input at a next time and acquiring a second spectrum signal of a frequency domain according to the second audio signal includes:
acquiring a second audio signal input at the next moment;
windowing the second audio signal according to a window function to obtain a windowed second audio signal;
and carrying out Fourier change on the windowed second audio signal to obtain the second frequency spectrum signal.
The step of reducing the spectrum amplitude corresponding to the howling frequency point to a first amplitude value includes:
and adjusting the frequency spectrum signal corresponding to the howling frequency point according to a preset proportion to enable the frequency spectrum amplitude corresponding to the howling frequency point to be reduced to a first amplitude value.
If the frequency spectrum amplitude corresponding to the howling frequency point in the second frequency spectrum signal is greater than the first amplitude value, the step of increasing the frequency spectrum amplitude corresponding to the howling frequency point in the second frequency spectrum signal to a preset frequency spectrum amplitude value includes:
if the ratio of the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal to the spectrum amplitude corresponding to the howling frequency point in the first spectrum signal is greater than the preset ratio, the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal is adjusted to a preset spectrum amplitude value by adjusting the spectrum signal corresponding to the howling frequency point in the second spectrum signal.
The algorithms or displays presented herein are not inherently related to any particular computer, virtual machine, or other apparatus. Various general purpose systems may also be used with the teachings herein. The required structure for constructing such a system will be apparent from the description above. In addition, embodiments of the present application are not directed to any particular programming language. It will be appreciated that a variety of programming languages may be used to implement the teachings of the present application as described herein, and any descriptions of specific languages are provided above to disclose the best modes of the present application.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the application may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the application, various features of the embodiments of the application are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the application and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be construed to reflect the intent: this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this invention pertains.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
It should be noted that the above-mentioned embodiments illustrate rather than limit the application, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The application may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means can be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names. The steps in the above embodiments should not be construed as limiting the order of execution unless specified otherwise.
Claims (10)
1. A method for audio signal howling detection and suppression, the method comprising:
acquiring a first audio signal input at the current moment, and acquiring a first frequency spectrum signal of a frequency domain according to the first audio signal;
detecting the first spectrum signal and acquiring a howling frequency point;
reducing the frequency spectrum amplitude corresponding to the howling frequency point to a first amplitude value;
acquiring a second audio signal input at the next moment, and acquiring a second frequency spectrum signal of a frequency domain according to the second audio signal;
if the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal is larger than the first amplitude value, the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal is adjusted up to a preset spectrum amplitude value.
2. The method of claim 1, wherein the method further comprises:
if the frequency spectrum amplitude corresponding to the howling frequency point in the second frequency spectrum signal is smaller than or equal to the first amplitude value, the frequency spectrum amplitude corresponding to the howling frequency point in the second frequency spectrum signal is adjusted to a preset second amplitude value, and the second amplitude value is smaller than the first amplitude value.
3. The method of claim 1, wherein the detecting the first spectrum signal and acquiring a howling frequency point comprises:
and determining the howling frequency point according to the peak-to-average power ratio (PAPR), the Peak Harmonic Power Ratio (PHPR) and/or the peak adjacent power ratio (PNPR).
4. The method as claimed in claim 3, wherein said determining the howling frequency point according to a peak-to-average power ratio (PAPR), a Peak Harmonic Power Ratio (PHPR), and/or a peak adjacent power ratio (PNPR) comprises:
determining a first candidate howling frequency point of the first spectrum signal according to the peak adjacent power ratio PNPR;
analyzing and screening the first candidate howling frequency point according to the peak-to-average power ratio (PAPR) to obtain a second candidate howling frequency point;
and analyzing and screening the second candidate howling frequency point according to the peak harmonic power ratio PHPR to obtain the howling frequency point.
5. The method as claimed in claim 1, wherein said obtaining a first audio signal input at a current time and obtaining a first spectrum signal in a frequency domain according to the first audio signal comprises:
acquiring a first audio signal input at the current moment;
windowing the first audio signal according to a window function to obtain a windowed first audio signal;
performing Fourier transform on the windowed first audio signal to obtain a first frequency spectrum signal;
the acquiring a second audio signal input at a next moment and acquiring a second spectrum signal of a frequency domain according to the second audio signal includes:
acquiring a second audio signal input at the next moment;
windowing the second audio signal according to a window function to obtain a windowed second audio signal;
and carrying out Fourier change on the windowed second audio signal to obtain the second frequency spectrum signal.
6. The method as claimed in claim 5, wherein the down-regulating the spectrum amplitude corresponding to the howling frequency point to a first amplitude value comprises:
and adjusting the frequency spectrum signal corresponding to the howling frequency point according to a preset proportion to enable the frequency spectrum amplitude corresponding to the howling frequency point to be reduced to a first amplitude value.
7. The method according to claim 6, wherein the step of, if the spectral amplitude corresponding to the howling frequency point in the second spectrum signal is greater than the first amplitude value, up-regulating the spectral amplitude corresponding to the howling frequency point in the second spectrum signal to a preset spectral amplitude value comprises:
if the ratio of the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal to the spectrum amplitude corresponding to the howling frequency point in the first spectrum signal is greater than the preset ratio, the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal is adjusted to a preset spectrum amplitude value by adjusting the spectrum signal corresponding to the howling frequency point in the second spectrum signal.
8. An audio signal howling detection and suppression apparatus, comprising:
the first acquisition module is used for acquiring a first audio signal input at the current moment and acquiring a first frequency spectrum signal of a frequency domain according to the first audio signal;
the second acquisition module is used for detecting the first spectrum signal and acquiring a howling frequency point;
the first adjusting module is used for reducing the frequency spectrum amplitude corresponding to the howling frequency point to a first amplitude value;
the third acquisition module is used for acquiring a second audio signal input at the next moment and acquiring a second frequency spectrum signal of a frequency domain according to the second audio signal;
and the second adjusting module is configured to, if the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal is greater than the first amplitude value, up-adjust the spectrum amplitude corresponding to the howling frequency point in the second spectrum signal to a preset spectrum amplitude value.
9. An audio signal howling detection and suppression apparatus, comprising: the system comprises a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface complete mutual communication through the communication bus;
the memory is configured to store at least one executable instruction that causes the processor to perform the audio signal howling detection and suppression method according to any one of claims 1-7.
10. A computer storage medium having stored therein at least one executable instruction for causing a processor to perform the audio signal howling detection and suppression method as claimed in any one of claims 1-7.
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