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Multi-channel sound amplification system and method for adjusting volume of loudspeaker

A loudspeaker and multi-channel technology, which is applied in the field of multi-channel sound reinforcement system that adaptively adjusts the loudspeaker volume based on environmental noise, and can solve the problem of loudspeaker output volume competing with each other

Active Publication Date: 2020-02-21
INST OF ACOUSTICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If a traditional independent control system is used, it may cause two adjacent speakers to estimate each other's output signals as their own noise, so that the output volume of the speakers of adjacent systems competes with each other

Method used

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  • Multi-channel sound amplification system and method for adjusting volume of loudspeaker
  • Multi-channel sound amplification system and method for adjusting volume of loudspeaker
  • Multi-channel sound amplification system and method for adjusting volume of loudspeaker

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Embodiment 1

[0104] like Figure 5 as shown, Figure 5 It is a schematic diagram of a specific application scenario of the present invention. In the figure, a railway station waiting hall with four waiting rooms is taken as an example. At this time, N=4, and each waiting room can be regarded as a subsystem. Each waiting room has its own loudspeaker, microphone, multi-channel echo cancellation module, noise sound pressure level acquisition module and volume gain acquisition module. In this embodiment, the microphone is preferably a microphone; for example, the microphone in the waiting room 1 can collect passengers' speech, noise caused by walking, air-conditioning noise, and echo signals played by all the speakers in the waiting room. Likewise, microphones in other waiting rooms pick up local noise and echo signals from all subsystems. Among them, the microphone is a preferred example of the microphone; if the single-channel echo cancellation technology is simply used, the echoes played...

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Abstract

The invention belongs to the technical field of public broadcast amplification, in particular to a multi-channel sound amplification system for adjusting the volume of a loudspeaker. The system comprises a plurality of sound amplification subsystems, each sound amplification subsystem corresponds to one channel, and each sound amplification subsystem performs echo cancellation by using the acquired sound signals and the sound source signals in all channels to obtain error signals. According to the obtained error signals, the noise sound pressure level of the current environment is obtained, the volume value of the loudspeaker in the sound amplification subsystem is calculated in combination with a mapping function, and the corresponding volume gain value of the loudspeaker at the current moment is obtained. By multiplying the sound signal to be played picked up from the sound amplification subsystem by the obtained loudspeaker volume gain value at the current moment, the processed sound source signal is obtained, and is played and amplified by the loudspeaker in the sound amplification subsystem.

Description

technical field [0001] The invention belongs to the technical field of public broadcasting sound reinforcement, in particular to a multi-channel sound reinforcement system and method for adjusting speaker volume, in particular to a multi-channel sound reinforcement system and method for adaptively adjusting speaker volume based on environmental noise. Background technique [0002] At present, the public address sound reinforcement system is widely used in people's daily life, such as airports, railway stations, subway stations, schools and other places. In these applications, people move frequently and the sound pressure level of ambient noise changes constantly. The volume of the existing public address sound reinforcement system is often fixed, or manually adjusted by the staff. Such a sound reinforcement system cannot well meet actual needs. When the environment is relatively quiet, the sound reinforcement system only needs to allow the audience to hear the broadcast cl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R27/00
CPCH04R27/00H04R2227/001
Inventor 齐园蕾杨飞然杨军
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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