Design of audio directional system based on FPGA

This paper presents the design of audio directional system which is based on FPGA. In this design, FPGA is used to implement digital signal generation, Hilbert transform, single sideband modulation, and accomplish the conversion from digital signal to PWM signal. The simulation results demonstrate that in the process of nonlinear self-demodulation of the SSB algorithm, without preprocessing, can restore to the original audio signal with zero distortion in the air. The implementation of signal processing based on DSP Builder was introduced. And the prototype of the audio directional system was made.