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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...
The algorithm of the dynamic range control (DRC) was applied in the research of the audio directional system. According to the feature of audio directional system, the implementation of the static curve was modified, and the model of DRC based on simulink was built. The calculation results demonstrate that DRC is an effective optimal method to enhance the main sound and reduce the noise in the audio...
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