Sound amplification system with reverberation time measurement function

A reverberation time and sound reinforcement system technology, applied in the field of sound reinforcement systems, can solve the problems of sound decay and other problems, achieve strong anti-interference ability, strong practicability, and reduce the time of reverberation time measurement

Inactive Publication Date: 2020-09-25
杭州艾力特数字科技有限公司
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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

Method used

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  • Sound amplification system with reverberation time measurement function
  • Sound amplification system with reverberation time measurement function
  • Sound amplification system with reverberation time measurement function

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Embodiment Construction

[0043] The specific embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0044] Such as figure 1 As shown, a sound reinforcement system with reverberation time measurement function is mainly composed of five parts, namely microphone, speaker, audio host, switch and computer. The audio host is divided into modules such as analog-to-digital conversion (A / D), digital signal processing unit (DSP), digital-to-analog conversion (D / A), and power amplifier.

[0045]Concrete implementation steps of the present invention are as follows:

[0046] Step 1: Under remote conditions, the remote computer is connected to the audio host in the room to be tested through the switch and the network, and the audio host is given a test command through the computer, and the audio host will perform the following operations according to the test command.

[0047] Step 2: Generate an exponential frequency sweep signal, the gener...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R27/00G01H7/00
CPCG01H7/00H04R27/00H04R2227/00
Inventor 任军军孙旭光罗浩孙云云
Owner 杭州艾力特数字科技有限公司
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