A loudspeaker array sound reinforcement system and method for suppressing howling

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 the current sound reinforcement system, curved loudspeaker arrays are often used to obtain a directional and evenly distributed sound field. At present, the 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 (referred to as QR) and genetic algorithms and other methods. Among them, the wave front correction technology uses the Fresnel principle in optics to optimize the wave front radiated by the loudspeaker array, and the similar DGRC technology can generate a sound field similar to an arc array in a linear array, whi...

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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 effectively suppress the howling, and to provide a sound field that can be adjusted according to the sound reinforcement environment, and fundamentally Loudspeaker array sound reinforcement system and method for suppressing howling

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