A method for suppressing feedback in indoor voice amplification

By using frequency domain processing methods with microphones and two speakers in an indoor voice amplification system to perform amplitude and phase modulation, the problems of gain limitation and signal impairment in howling suppression are solved, achieving howling suppression effect with high stable gain and low distortion.

CN117880716BActive Publication Date: 2026-06-30ZHEJIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG UNIV
Filing Date
2024-01-15
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing technologies for suppressing howling in indoor speech amplification systems suffer from problems such as gain control limiting amplification volume, adaptive filter parameter estimation bias, high computational overhead, and complex and inaccurate parameter calculations, resulting in insufficient stable gain and severe damage to the speech signal.

Method used

It employs a microphone and two speakers on either side of the discrete microphone. The audio signal is amplitude-modulated and phase-modulated by an audio processing unit. Frequency domain processing methods are used to control howling, simplifying the calculation process and improving the system's stable gain.

Benefits of technology

It effectively suppresses howling, increases the maximum stable gain of the system, reduces signal distortion, simplifies the calculation process, improves calculation accuracy, and achieves a significant improvement in stable gain.

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Abstract

This invention discloses a method for suppressing feedback in indoor voice amplification. The system implementing this method includes at least one microphone, two speakers located on either side of the microphone, and an audio processor. The method includes the following steps: the microphone acquires audio signal data from the environment; the audio processor includes an audio processing unit and a power amplification unit, wherein the audio processing unit converts the acquired single-channel audio signal data into two-channel audio signal data and outputs them to the power amplification unit. During the conversion, amplitude modulation and phase modulation are achieved through dual channels. The power amplification unit adjusts the power of the two-channel audio signal data and outputs it to the two speakers; the two speakers play the audio signal data. This method enables the system to achieve a significant increase in maximum stable gain (MSG) while avoiding feedback and reducing distortion.
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