Sound amplification system with reverberation time measurement function

Abstract

The invention discloses a sound amplification system with a reverberation time measurement function. The system comprises a sound amplification box, a microphone and an audio host. The audio host measures reverberation time by adopting an impulse response integral method in which an exponential swept-frequency signal is used as an excitation sound source; the microphone is used for transmitting anacquired audio signal to the audio host; the audio host performs linear convolution on the acquired audio signal and a reverse swept-frequency signal to obtain an impulse response signal; pulse response signals are enabled to pass through octave filters with different center frequencies and corresponding pulse response signals under different center frequencies are obtained; and finally, reverseintegration is carried out on all the pulse response signals to obtain an energy attenuation curve, sample data in the energy attenuation curve is selected to carry out linear fitting, and reverberation time is calculated according to the slope of a linear fitting straight line. The system has the advantages of strong practicability, high precision, small error, short measurement time, simultaneous measurement of a plurality of different positions, remote measurement and the like.

Description

technical field [0001] The invention relates to the technical field of sound reinforcement systems, in particular to a sound reinforcement system with a reverberation time measurement function. Background technique [0002] The sound reinforcement system usually refers to a system that amplifies the speaker's voice to the listener in real time, so that the speaker and the listener are in the same acoustic environment. The sound reinforcement system includes a sound reinforcement system and a sound field. A successful sound reinforcement system must be loud enough, sufficiently intelligible, and able to evenly cover the audience area. Sound reinforcement systems are widely used in classrooms, conference rooms, gymnasiums, cinemas and other places. [0003] Studies have shown that reverberation time is one of the acoustic parameters that affect the sound field and intelligibility of a room. Appropriate reverberation time helps to improve the uniformity of the sound field and...

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Problems solved by technology

The biggest disadvantage of this method is that the acoustic decay is affected by the unavoidable instantaneous fluctuations in random processes

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