Public broadcasting sound pressure self-adaptation control method

Abstract

The invention relates to a public broadcasting sound pressure self-adaptation control method. Through a magnitude squared coherence (MSC) function, the coherence of site sound signals and broadcast source frequency spectrums is computed, an obtained MSC coefficient is used as an MSC signal-to-noise ratio representation value to indirectly represent the site signal-to-noise ratio, and accordingly public broadcasting sound pressure is adjusted in a self-adaptation mode. According to the public broadcasting sound pressure self-adaptation control method, the MSC function is used for estimating the coherence of the site sound signals and the broadcast frequency spectrums, so that the site signal to noise ratio (SNR) information is obtained, under the condition that sound pollution is not increased, after sound pressure level adjusting, site mixed signals are obviously clearer than original site mixed signals, and broadcast content can be clearly heard.

Description

technical field [0001] The invention relates to an adaptive control method for sound pressure of public broadcasting. Background technique [0002] With the development of economy and society, many public places have installed public broadcasting or voice guidance systems. For example: public address systems in schools, stations, parks, shopping malls and other places can be used to play background music, emergency safety guidelines, business promotion, etc. Although public broadcasting brings convenience to people's work and life, there is also a problem that cannot be ignored, that is, the volume of the sound played by the system is fixed, which will cause two problems: First, the sound played by the system is too small. will be masked by noise; secondly, excessive volume will produce noise pollution. Therefore, people hope that the public address system should be able to adaptively adjust the sound pressure level of broadcast sound reinforcement according to the signal-...

AI Technical Summary

Problems solved by technology

Although public broadcasting brings convenience to people's work and life, there is also a problem that cannot be ignored, that is, the volume of the sound played by the system is fixed, which will cause two problems: first, the sound played by the system is too small. will be masked by noise; secondly, excessive volume will produce noise pollution

[0010]Since the main source of noise in public places is crowd noise, and the physical characteristics of the noise signal (and on-site reverberation) are not much different from the broadcast signal, it is difficult to separate the noise accurately signal, which is the fundamental reason why the above methods based on environmental noise recognition are not ideal

Images