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CAN bus - based voice communications program

Author: ZhaoMing
Tutor: SunLi；LiYongJian
School: North China University of
Course: Control Engineering
Keywords: audio communicating audio compression/decompression CAN bus SJA1000
CLC: TN912.3
Type: Master's thesis
Year: 2010
Downloads: 116
Quote: 0
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Abstract


Applications of field bus in practical work spot are increasing as its development. CAN bus is widely used in industria control, mine- performance, communication, electric force, and in industria position audio communicating system based on CAN bus is required for monitoring and liaising. So audio communication is a new usefulness for CAN bus aside from transmission of industria control- information. This need us to carry the usefulness into execution based on its much advantage. And this could raise the bandwidth- availability on CAN bus.The paper mainly introduces a system solution version of an audio communicating system based on CAN bus. The sysytem works in the PELICAN mode.After investigationing audio coding and compression/decompression technologies, and assessing the feasibility and merit in audio communicating based on CAN bus, we choose the Motorola’s MC14LC5480 which used as audio sampling and coding chip, the DVSI’s AMBE-1000 which used as audio compression/decompression chip. It also introduces the behaviour instruction of MC14LC5480 and AMBE-1000. The paper discuss the hardware/software technology of the system. It describes every function module, includes audio coding circuit, audio compression/decompression circuit and CAN bus transmit circuit, through analysing the properties of chips in the sysytem.The system works at duplex status. At the sending- end, the input analog audio signal is sent into A/D coder to perform the A/D conversion. The PCM signal got from the conversion, is then sent into the compression/decompression chip to be encoded. The coding data packages processed by the single-chip are sent to a corresponding node by CAN- controller. At the receiving- end, the coding data packages are sent to the single- chip to be processed by CAN-controller. And then the realigned coding data packages are transfered into PCM signal by the compression/decompression chip. The PCM signal is sent to D/A coder to perform D/A switching. The signal is then amplified in the power amplifier to renew the original sound.Proved by experiments, the audio communicating can go on between two nides.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Electro-acoustic technology and speech signal processing > Speech Signal Processing
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