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Howling detection method and device

A detection method and threshold value technology, applied in the field of signal processing, can solve the problem of inaccurate detection of howling frequency points

Inactive Publication Date: 2018-12-28
CHINA MOBILEHANGZHOUINFORMATION TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides an information processing method and electronic equipment, which are used to solve the technical problem of inaccurate detection of howling frequency points in the prior art

Method used

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  • Howling detection method and device

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Experimental program
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Embodiment 1

[0037] Embodiment 1 of the present invention provides a howling detection method, which is used to solve the technical problem of inaccurate detection of howling in the prior art. refer to figure 1 , the method includes:

[0038] Step 110: Transform the voice signal collected by the microphone from the time domain to the frequency domain to obtain a frequency domain signal corresponding to the voice signal.

[0039] Specifically, the voice signal collected by the microphone within a period of time is obtained, and the acquired voice signal is processed in frames to obtain M frames of time domain signals; and then each frame of time domain signals in the M frames of time domain signals is The signals are respectively subjected to frequency-domain band-division processing to obtain M frequency-domain signals; finally, any one of the M frequency-domain signals is used as a frequency-domain signal corresponding to the voice signal. Wherein, the frequency band where each frequenc...

Embodiment 2

[0070] Embodiment 2 of the present invention provides a howling detection device, which is used to implement the howling detection method provided in Embodiment 1 above. refer to Figure 5 , the device includes:

[0071] A conversion unit 201, configured to convert the voice signal collected by the microphone from the time domain to the frequency domain, to obtain a frequency domain signal corresponding to the voice signal;

[0072] A calculation unit 202, configured to calculate a first ratio between the first signal energy of the frequency domain signal at a first frequency point and the total energy of the frequency domain signal, where the first frequency point is where the frequency domain signal is located Any frequency point in the frequency domain;

[0073] The first determination unit 203 is configured to determine the howling threshold value according to the energy of the voice input signal of the speaker;

[0074] A judging unit 204, configured to judge whether t...

Embodiment 3

[0083] Embodiment 3 of the present invention provides a howling detection system, which is used to implement the howling detection method provided in Embodiment 1 above. refer to Figure 6 , the system includes a pickup circuit 301, a signal processing circuit 302 and a signal judging circuit 303.

[0084] The sound pickup circuit 301 is respectively connected with the microphone and the loudspeaker of the sound reinforcement system, and is used to obtain the voice signal collected by the microphone and the voice input signal of the loudspeaker;

[0085] The signal processing circuit 302 is connected to the sound pickup circuit 301, and is used to convert the voice signal collected by the microphone from the time domain to the frequency domain, so as to obtain a frequency domain signal corresponding to the voice signal;

[0086] The signal judging circuit 303 is connected to the signal processing circuit 302, and is used to calculate a first ratio between the first signal ene...

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Abstract

The invention provides a howling detection method and device and aims to solve a technical problem of inaccurate howling detection in the prior art. The method is advantaged in that a voice signal collected by a microphone is converted from a time domain to a frequency domain to obtain a frequency domain signal corresponding to the voice signal; a first ratio of the first signal energy of the frequency domain signal at a first frequency point to the total energy of the frequency domain signal is calculated, and the first frequency point is any frequency point in the frequency domain where thefrequency domain signal is located; a howling threshold value is determined according to the energy of a voice input signal of a loudspeaker; whether the first ratio is greater than the howling threshold value is determined; if yes, that the first frequency point is a howling frequency point is determined, and howling suppression of the first frequency point is performed.

Description

technical field [0001] The invention relates to the field of signal processing, in particular to a howling detection method and device. Background technique [0002] In the sound reinforcement system, the voice signal played by the speaker will return to the microphone to be picked up again by the microphone after being reflected by obstacles, and then the microphone will send the reflected voice signal to the speaker for playback, so that the repeated superposition makes part of the voice signal in the sound reinforcement Self-excited oscillation occurs in the system, and a piercing scream is issued, that is, howling. [0003] In order to suppress the occurrence of howling, it is necessary to perform howling detection on the signal. The usual way to detect howling in the prior art is to process the voice signal collected by the microphone in the frequency domain, and then set A threshold, and compare the characteristic value of the energy of the signal at each frequency po...

Claims

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Application Information

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IPC IPC(8): G10L21/0208G10L21/0232
CPCG10L21/0208G10L21/0232
Inventor 宋钦梅陈民姜梦琪方华郭文标
Owner CHINA MOBILEHANGZHOUINFORMATION TECH CO LTD