The Real-Time Audio Signal Acquisition, Processing And Distribution System Based On DSP

Underground water pipe leakage has plagued each of the water supply enterprises, it will not only result in waste of water resources, reduce economic efficiency of enterprises, but also harm the surrounding environment. DSP chip TMS320VC5416-160 and the AD/DA converter chip TLV320AIC10 were designed and implemented for detecting leaks in underground pipes real-time audio signal acquisition, processing and distribution system. As the signal is often weak,in order to suppress ambient noise, especially the 50Hz grid frequency interference,system uses the OPA177 low-noise amplifier designed preamplifier circuit,double-T network designed a 50Hz notch filter,improved signal to noise ratio. With mixed C and assembly language programming approach, to achieve the application programming design. the parameteres of IIR digital filter are designed on MATLAB platform according to the requiement of the system, IIR digital filter is given in the Implementation of the DSP, and one of the filtering algorithm, the sampling frequency, the clock frequency of the key design techniques were analyzed. CCS through on-site practical test and simulation environment to verify the real-time systems, stability and anti-jamming capabilities are designed to achieve the expected targets.The system of underground pipeline leak point pressure sensor leaking sound signals through the sound signal is converted to analog signals, then amplified by the conditioning circuits,50Hz filter processing, After sampling by the TLV320AIC10 converted to digital signals into the DSP in.According to leaks in the internal DSP sound bandwidth on the sampling signal further band pass filter, To improve the sound quality, filtered digital signal through TLV320AIC10 chip D/A converted output to monitor headphones. The system implements a complete real-time voice of the underground pipeline leak monitoring equipment in the design, The hardware,software programming and filtering algorithms have better practical value. Finally, summarize the main thesis of the work and the existing problems, brings up suggestions and prospects for the future wok.