Electronic beam steering control system for linear array loudspeaker

Abstract

The application discloses an electronic beam deflection control system for a linear array sound box, and particularly relates to the technical field of digital signal processing, and comprises a frequency domain compensation unit, a delay filter unit, a smooth switching unit, a multi-channel power amplification module and a linear loudspeaker array; the delay filter unit utilizes a Farrow structure fractional order delay and a shift register to realize sub-sampling precision phase interpolation and suppress spatial grating lobes; the smooth switching unit combines zero-crossing detection, timeout strong detection and power complementary windows to realize angle switching without explosive sound smooth transition; the multi-channel power amplification module constructs a voice coil thermal compression model based on sampling, dynamically corrects amplitude and phase coefficients in a closed loop, and eliminates sound beam distortion under long-time high power; the linear loudspeaker array satisfies anti-grating physical spacing constraints; the application realizes high pointing accuracy, no explosive sound, high-power self-adaption and low algorithm power consumption sound beam control.