Design, Multi-node Voice Communications Systems Based On Can Bus

In practical work spot,voice communication will go on in very badly circumstance.As CAN bus was more widely used in industrial field,we design a voice commutication system which is based on CAN bus.This system tends to transmit voice signals among several nodes by CAN bus.This paper introduces a hardare circuit design of a voice communication system based on CAN bus. The system consists of two important component, one is the Motorola's MC14LC5480 which working as audio sampling and codec, the other is AT90CAN128 as MCU.In the first half of this paper, it present CAN bus communication network and voice signals digital processing. It also estimates the advantage of the voice signal over CAN bus. The second half of this paper discuss the software/hardware technologies of the voice communication system which based on CAN bus. This paper also analyses each correlative function module in the system, include voice codec circuit, digital signal process circuit and CAN bus transmit circuit.Finally, voice communication may go on among several nodes in laboratory.