A Study Of High-Speed Audio Collection And Recovery Technology In Optical Communications

With the wide application of audio collection and recovery technology more and more highly demand are proposed on various technical index of audio data, especially on the requirements of rate. Demand for high-speed audio collection and recovery system at home and abroad, the paper designed and prepared a set of high-speed equipment based on optical wireless communications.The paper is based on the basic principles of communication and integration of high-speed audio capture and recovery technology with wireless laser communication technology, analyzed and studied the design and implementation of the high-speed audio capture encoding and recovery decoding part.In this paper, the input is the four audio signals. First, making an amplification adjustment on the input audio signal and a processing on modulus conversion: audio using G.729coding standard compression coding, then getting low audio digital signal through the CPLD and conversion chip, according to the time division multiplexing principle for high speed processing, then obtaining the baseband signal to frame format to FPGA for00K modulation, and through the two way difference serial transmit to laser; Receiving part:after receiving the demodulated audio signal then to process on demultiplexing and decoding, and finally back out. The light source adopts semiconductor laser, laser adopts direct light emphasis on digital audio signal. At the same time on the laser drive circuit and protection circuit were simply introduced.Acquisition and restoration of part of the design is complete, the system is modulated with the test system, test results in the theoretical range, which also prove the feasibility of this thesis can be based on high-speed optical communication audio communication。...