A Design Of The Sound Capture And Playback Based Cobranet For Video Conferencing System

Traditional video conference system, participants voice signals through therespective microphone pickup, the audio cable sent to the mixer for mixing.This kind of mode, each corresponding to a microphone cable, such as aphone number, long transmission distance, there will be the signal attenuationand interference, easy to produce noise and current sound, seriously affectingspeech clarity, so that the distal site participants couldn’t hear the speaker’speech content, seriously restricting the video conference systemdevelopment. With the digital conference system improvement and thecontinuous development of network technology, more and more analogtransmission system to digital transmission network transformation, videoconference audio system also is such.Cobranet digital audio transmission system is a use of network real-timetransmission of professional audio data stream system, which is based onCirrus Logic production series of professional audio digital processing chip, theanalog voice signal is converted to a digital signal to be transmitted, breakingthe simulation system in a microphone line pattern, achieved through acommon cable maximum128sound signal target. In the process oftransmission, Cobranet digital audio transmission system support on eachsignal in real-time monitoring and fault alarm, and can flexibly control signals inthe audio transmission system routing. Its appearance, greatly saving thevideo conference system audio wiring cost, reduces the line maintenancedifficulty, improve the whole meeting sound system reliability.This article from the analog voice signal acquisition, quantization andCobranet system for digital transmission and playback and other aspects, adesign based on Cobranet technology of video conference room withprofessional audio collection and transmission system, in this paper, theanalog signal acquisition process of quantification and Cobranet digital audio transmission system model for research, a detailed analysis of the Cobranetprotocol clock data packet data packet, appointment, audio packet structureand system operation of network hardware requirements, and the transmissionnetwork optimization design.The design of the system, can meet the video conference room acousticsystem of digital transmission requirement, solve the traditional analogtransmission mode signal interference and attenuation, greatly improve thevideo conference system audio signal transmission effect, improve the speechclarity, to the development of the video conference system has certainpromotion effect.