Method and device for detecting howling frequency point of sound reinforcement system

Abstract

The invention relates to a method and a device for detecting the howling frequency point of an acoustic amplification system. The method comprises the following steps of converting collected voice signals to frequency domain signals; searching for sub-bands where the howling frequency point exists within the bandwidth range of the frequency domain signals; detecting the howling frequency point within the range of the sub-bands where the howling frequency point exists. According to the method and the device for detecting the howling frequency point of the acoustic amplification system provided by the invention, the frequency point at which the howling occurs can be precisely and automatically positioned by compressing the searching range of the howling frequency point twice and by sampling and extracting time domain signals according to the howling frequency point existing range; the method is low in complexity and convenient to realize in real time on hardware, so that the howling inhibition of the acoustic amplification system can be further realized more economically.

Description

technical field [0001] The invention relates to the technical field of digital signal processing, in particular to a method and device for detecting howling frequency points of a sound reinforcement system. Background technique [0002] In the sound reinforcement system, since the microphone and the speaker are used in the same sound field at the same time, the sound of the speaker is received by the microphone through the reflection of the surrounding interface, amplified by the power amplifier, and sent out by the speaker, thus forming an acoustic loop. When the gain of the transfer function of the loop is greater than 1 at a certain frequency point and the phase is an integer multiple of 2π, the sound reinforcement system will become unstable and cause howling. Howling is a very common acoustic feedback phenomenon in the sound reinforcement system, which limits the improvement of the sound reinforcement gain of the system, and even makes the system unable to work normally...

AI Technical Summary

Problems solved by technology

In order to achieve higher frequency resolution and accurately detect howling frequency points, the methods generally used include Chirp-z transform algorithm, MUSIC algorithm, wavelet analysis and reconstruction algorithm, etc. Although these algorithms can achieve higher resolution rate, but its common disadvantage is that the complexity of the algorithm is high, which leads to the high cost of hardware required for implementation

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