Loudspeaker array sound reinforcement system and method for inhibiting howling

A technology of loudspeaker array and sound reinforcement system, applied in the direction of sound reinforcement system, electrical components, etc., can solve the problems of inability to constrain non-sound reinforcement areas, and the sound field cannot be effectively suppressed.

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

[0005] The purpose of the present invention is to overcome the defects in the existing loudspeaker array sound reinforcement system that the sound field in the non-sound reinforcement area cannot be restrained so as to effect

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  • Loudspeaker array sound reinforcement system and method for inhibiting howling
  • Loudspeaker array sound reinforcement system and method for inhibiting howling
  • Loudspeaker array sound reinforcement system and method for inhibiting howling

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Embodiment Construction

[0069] The present invention will be further elaborated below with reference to the drawings and specific embodiments.

[0070] Such as figure 1 As shown, a speaker array sound reinforcement system for suppressing howling includes: an input signal processing module 1, a filter module 2, a multi-channel power amplifier 3, and a speaker array 4;

[0071] The input signal processing module 1 is used to convert the acoustic signal collected by the microphone into a digital audio signal through analog / digital conversion;

[0072] The filtering module 2 includes: a parameter setting unit 201, a filter bank generating unit 202, and a filter bank processing unit 203;

[0073] The parameter setting unit 201 is used to set the relative positions of the speaker array 4, the sound reinforcement target area and the sound reinforcement microphone area, set the number L of the speaker array 4, and the control point of the sound reinforcement target area The number M of the sound reinforcement micro...

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Abstract

The invention provides a loudspeaker array sound reinforcement system for inhibiting howling. The system comprises an input signal processing module (1), a filter module (2), a multichannel power amplifier (3) and a loudspeaker array (4); the filter module (2) comprises a parameter setting unit (201), a filter group generation unit (202) and a filter group processing unit (203); the filter group generation unit (202) is used for calculating convolution matrixes Hm and Hn formed by time domain impulse response at each control point of the loudspeaker array (4) according to parameters set by the parameter setting unit (201); calculating matrixes Rb and Rd accordingly; calculating a matrix Q according to an average amplitude response fluctuation parameter expression of an equilibrium control point in a sound reinforcement target area; solving a vector w according to Rb, Rd and Q to ensure a maximum value of time domain acoustic energy contrast control of single point equilibrium; converting the vector w into a filter form; and acquiring filter parameters of the filter group processing unit (203).

Description

Technical field [0001] The invention relates to the application field of linear loudspeaker arrays, in particular to a loudspeaker array sound reinforcement system and method for suppressing howling. Background technique [0002] In current sound reinforcement systems, curved speaker arrays are often used to obtain a directional and uniformly distributed sound field. The current sound field optimization methods for speaker arrays mainly include wavefront correction technology and digital geometric radiation control (Digital and Geometric Radiation Control). Radiation Control, referred to as DGRC) technology, SINC function theory, quadratic residual sequence (abbreviated as QR) and genetic algorithm and other methods. The wavefront correction technology uses the Fresnel principle in optics to optimize the wavefront radiated by the speaker array, and similar DGRC technology can produce a sound field similar to an arc-shaped array in a linear array, which is convenient for the array...

Claims

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Application Information

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IPC IPC(8): H04R27/00
Inventor 刘力蔡野锋吴鸣杨军
Owner INST OF ACOUSTICS CHINESE ACAD OF SCI
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