Adaptive gain control method of sound reinforcement system

Abstract

The invention discloses an adaptive gain control method of a sound reinforcement system. The method comprises the following steps: S1, presetting an initial system gain, and directly picking up a played sound reinforcement source signal in a circuit of the sound reinforcement system; S2, multiplying the sound reinforcement source signal by the initial system gain, and then playing the sound reinforcement source signal through a loudspeaker in the sound reinforcement system; S3, picking up an onsite sound reinforcement mixed signal by setting a microphone on a sound reinforcement site, that is,a signal obtained by performing convolution on a product of the sound reinforcement source signal and the system gain with a sound field pulse, and then adding a noise signal; S4, calculating an estimated onsite signal to noise ratio according to a selected function relationship by using an MSC signal to noise characterization value; and S5, adjusting the gain of the sound reinforcement system according to the estimated onsite signal to noise ratio. By adoption of the adaptive gain control method of the sound reinforcement system provided by the invention, the gain setting of the sound reinforcement system is more accurate, the sound reinforcement volume is suitable, and the adjusted sound signal on the sound reinforcement site is obviously clearer than the onsite sound signal performed with no adaptive adjustment without increasing sound pollution.

Description

technical field [0001] The invention belongs to the technical field of sound reinforcement adjustment, and relates to a gain adaptive control method of a sound reinforcement system. Background technique [0002] With the development of economy and society, sound reinforcement systems such as public address or voice guidance for sound reinforcement have been installed in many public places. For example, public address PA systems in schools, stations, parks, shopping malls and other places can be used to play background music, emergency safety guidelines, business promotion, etc. Although the sound reinforcement system 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 bring two problems: first, the volume played by the system is too low. The sound will be masked by the noise; secondly, the loud volume will produce noise pollution. Therefore, it is hoped that...

AI Technical Summary

Problems solved by technology

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

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