Loudspeaker array sound-reinforcement system and method for generating uniform sound fields

A technology of loudspeaker array and sound reinforcement system, applied in sensor, transducer circuit, sensor parts and other directions, can solve the problem of uneven distribution of sound field and so on

Active Publication Date: 2016-11-23
INST OF ACOUSTICS CHINESE ACAD OF SCI
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Problems solved by technology

However, the beam control method of this type of loudspeaker array is relatively simple, and the sound pressure level of the generat

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  • Loudspeaker array sound-reinforcement system and method for generating uniform sound fields
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  • Loudspeaker array sound-reinforcement system and method for generating uniform sound fields

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Embodiment Construction

[0056] The present invention will be further elaborated below in conjunction with the accompanying drawings and specific embodiments.

[0057] Such as figure 1 As shown, a loudspeaker array sound reinforcement system that generates a uniform sound field, the system includes: an input signal processing module 1, a filtering module 2, a multi-channel power amplifier 3 and a loudspeaker array 4;

[0058] The input signal processing module 1 is used to convert the input sound source into a digital audio signal through analog / digital conversion;

[0059] The filtering module 2 includes: a parameter setting unit 201, a filter bank generating unit 202 and a filter bank processing unit 203; the filter bank processing unit 203 includes L filters;

[0060] The parameter setting unit 201 is configured to set the relative position of the speaker array 4 and the target area, set the shape of the speaker array 4, the number L of units and the number M of control points in the target area, ...

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Abstract

The invention provides a loudspeaker array sound reinforcement system generating a uniform sound field, comprising: an input signal processing module (1), a filtering module (2), a multi-channel power amplifier (3) and a loudspeaker array (4); the filtering module (2) comprising: a parameter setting unit (201), a filter bank generating unit (202) and a filter bank processing unit (203); the filter bank generating unit (202) is configured to set The parameter design optimization problem set by unit (201): in the actual sound field energy efficiency is greater than or equal to J c Under the constraint condition, find a vector solution, make the difference of the actual sound field distribution calculated and target sound field distribution minimum; This vector solution is complex number weight coefficient vector; According to described complex number weight coefficient vector, obtain described filter bank processing unit ( 203) the time-domain impulse responses of the L filters. The sound reinforcement system of the invention can form a uniformly distributed sound field in the target area.

Description

technical field [0001] The invention relates to the application field of a linear loudspeaker array, in particular to a loudspeaker array sound reinforcement system and method for generating a uniform sound field. Background technique [0002] In long-distance outdoor sound reinforcement applications such as square performances, as well as sound reinforcement in large indoor spaces such as railway stations, airport terminals, and stadiums, the sound reinforcement system needs to solve many problems. The first is the inconsistency of sound pressure levels in the near and far fields caused by the diffusion and attenuation of sound waves in the long sound reinforcement distance, which requires good uniformity of the sound reinforcement sound field. At the same time, there are various noises outdoors and the reflection of buildings around the sound reinforcement area, and there is a long-term reverberation in the large indoor space. These factors have high requirements for the d...

Claims

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Application Information

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IPC IPC(8): H04R3/00
Inventor 刘力蔡野锋吴鸣杨军
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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