声频定向扬声器FPGA音频电路设计

Circuit Design of Audio Directional Loudspeaker Based on FPGA

声频定向扬声器是一种利用超声解调原理使声音在空气中实现定向传播的装置,装置应用FPGA来进行模拟声音信号的采集和处理。FPGA是一种可编程芯片,其并行处理的特点可以进行多通道数据同时采集和处理,实现数字信号高速实时性处理。声频定向装置的数据采集平台由前置放大器、ADC模数转换器、存储器和DAC模块组成,FPGA芯片和外围设备之间的通信按照SPI接口协议进行。应用Verilog语言,编写相关模块,在FPGA平台上实现了模拟音频信号的实时采集、调制、存储和输出过程。

The directional loudspeaker is a device using ultrasonic demodulation principle which enable sound to transport in air directional, the device uses FPGA to sample and process the sound signal. FPGA is a programmable chip, the parallel processing features can obtain and process multi-channel data at the same time, high-speed real-time digital signal processing is realized. Directional audio data acquisition device platform is consisted of pre-amplifier, ADC, memory and DAC modules, FPGA chips and the communication between peripheral devices are in accordance with SPI interface protocol. In this paper, the related modules are written in Verilog language, real-time analog audio signal acquisition, modulation, storage and output process are implemented in the FPGA platform.