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Howling detection method and device

A detection method and threshold technology, which are applied to measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problems of strong whistling, damage to sound amplification equipment such as speakers, and masking of effective information, and achieve high accuracy. Effect

Active Publication Date: 2021-10-15
宁波启拓电子设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The howling is strong and harsh, which not only makes the audience feel uncomfortable, but also covers up the effective information in the original sound; on the other hand, the generation of howling will cause damage to sound amplification equipment such as speakers

Method used

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  • Howling detection method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1. A howling detection method, such as figure 1 and 2 As shown, perform the following steps in a silent environment (15dB and below):

[0045] S1. Obtain specific parameters of the audio currently input by the microphone, and process the specific parameters to obtain corresponding judgment parameters. The specific steps are as follows:

[0046] Note: The specific parameter in this embodiment is the gain change curve.

[0047] 1.1. Obtain the PCM (Pulse Code Modulation, pulse code modulation recording) corresponding to the audio currently input by the microphone, and calculate the gain value of the current audio segment according to the PCM.

[0048] Note: PCM recording is to convert analog signals such as sound into symbolized pulse trains, and then record them. The PCM signal is a digital signal composed of symbols such as [1] and [0]. Compared with analog signals, it is less susceptible to clutter and distortion of the transmission system. The dynamic ...

Embodiment 2

[0069] Embodiment 2, a howling detection device, such as image 3 As shown, it includes a judgment parameter module 1 and a judgment comparison module 2 connected by signals;

[0070] The judging parameter module 1 is used to obtain specific parameters of the audio currently input by the microphone, and process the specific parameters to obtain corresponding judging parameters, wherein the specific parameter is the gain change curve corresponding to the audio, and the judging parameter is the first order of the gain changing curve derivative value;

[0071] In this embodiment, the judgment parameter module 1 includes a signal-connected parameter acquisition unit 11 and a parameter processing unit 12, and the parameter processing unit 12 is connected to the judgment comparison module 2 with a signal;

[0072] The parameter acquisition unit 11 is used to obtain the PCM of the audio corresponding to the audio currently input by the microphone, and obtain the gain value of the cu...

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Abstract

The present invention proposes a howling detection method. The following steps are carried out in a sound field environment below 15dB: first, obtain specific parameters of the audio currently input by the microphone, and process the specific parameters to obtain corresponding judgment parameters; the specific parameters are audio corresponding The gain change curve of the gain change curve; the judgment parameter is the first-order derivative value d of the gain change curve, and the first-order derivative value d reflects the speed of the gain value change in the sound field; secondly, compare the obtained judgment parameter with its threshold value to obtain the comparison result, and judge according to the comparison result Whether there is howling. The threshold for howling detection in the present invention is almost constant, only slightly affected by the similar distance between the microphone and the sound box, and the threshold can be fine-tuned according to actual needs, so that the detection result is more accurate.

Description

technical field [0001] The invention relates to a howling detection method and device. Background technique [0002] Howling is an uncontrollable feedback sound; when the microphone and speaker are used at the same time, the microphone captures the sound reproduced by the speaker and the sound energy from the speaker is large enough to produce howling; [0003] The howling is strong and piercing, which not only makes the listeners feel uncomfortable, but also covers up the effective information in the original sound; on the other hand, the generation of howling will cause damage to sound amplification equipment such as speakers. In order to avoid the generation of howling, it is necessary to detect whether the howling is generated. Contents of the invention [0004] Aiming at the shortcomings in the prior art, the invention provides a howling detection method and a howling detection device. [0005] In order to solve the above technical problems, the present invention is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04R29/00G01H17/00
CPCG01H17/00H04R29/001
Inventor 李政吴建春王超敏黄道炎
Owner 宁波启拓电子设备有限公司