Audio dynamic feedback suppression method

A dynamic feedback and audio technology, applied in the direction of frequency response correction, etc., can solve the problems of poor estimation accuracy, estimation non-convergence, weak robustness, etc., to reduce the amount of data, improve response speed and resolution, and good robustness Effect

Inactive Publication Date: 2010-08-18
杭州联汇云晟科技有限公司
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AI Technical Summary

Problems solved by technology

The adaptive notch method has a fast response speed and a small amount of calculation, but the estimation accuracy of the self-excited frequency generated under the music background is poor, so it is possible to suppress the normal music signal as a self-excited signal
The robustness of the adaptive notch method is also weak, and there will be situations where the estimation does not converge

Method used

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  • Audio dynamic feedback suppression method
  • Audio dynamic feedback suppression method
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Embodiment Construction

[0028] Such as figure 1 , 2 In the audio dynamic feedback suppression method shown, the analog audio signal obtained by the microphone (MIC) is converted into a digital signal through an AD converter, and within the audio range of 20Hz-20KHz, the frequency is logarithmically spaced at 1DB (10 0.1 ) into four frequency bands, frequency band 1 (LP): 0-160HZ, frequency band 2 (BPL): 160-800HZ, frequency band 3 (BPM): 800-4000HZ, frequency band 4 (HP): 4000-20000HZ, each frequency band and the center Frequency, frequency domain resolution and frequency offset are shown below.

[0029] frequency band

Band 1

Band 2

Band 3

Band 4

Resolution Δf(Hz)

1.25

6.25

31.25

187.5

Frequency band center frequency f 0 (Hz)

80

480

2400

12000

[0030] frequency band

Band 1

Band 2

Band 3

Band 4

Δf / f 0 (%)

1.56％

1.30％

1.30％

1.56％

[0031] The transfer ...

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Abstract

The invention relates to an audio dynamic feedback suppression method, which relates to the field of digital audio processing in a sound reinforcement system. The prior art has the defects of slow response speed, low resolution and the like. The method comprises the following steps: decomposing digital audio signals into sub signals at a plurality of frequency bands; according to the preset sampling rate, desampling the signal at each frequency band after being filtered; carrying out the fast Fourier transform analysis for digital audio at each frequency band after being desampled, and estimating the self-excitation frequency; and filtering the self-excitation frequency according to the estimated result. Under the premise of ensuring good robustness, the response speed and resolution are improved, and the filtering is precise.

Description

【Technical field】 [0001] The invention relates to the field of digital audio processing in a sound reinforcement system, in particular to a suppression technology based on estimating the self-excited frequency of audio in a relatively closed acoustic environment. 【Background technique】 [0002] In the sound reinforcement system, the microphone and the speaker are in the same sound field. When the amplifier gain is too large, it is easy to cause self-excitation (howling). Self-excitation may cause damage to audio equipment and damage human hearing. [0003] At present, there are three main methods for suppressing feedback self-excitation: frequency shift method, EQ adjustment method and dynamic feedback suppression method. [0004] The frequency shift method is simple, economical and practical, but it is only suitable for speech reinforcement systems. The EQ equalizer has a wide frequency band, but pulling the feedback point through the EQ will result in a loss of the audio ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R3/04
Inventor 赵凡祁才君
Owner 杭州联汇云晟科技有限公司
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