DSP to improve oral communications inside vehicles

A Cabin Car Communication System (CCCS) has the goal of improving the communication among passengers inside vehicles [1]. The lack of visual contact between speakers, the high level of noise and many other factors degrade the communications inside vehicles. The CCCS makes use of a set of microphones placed on the overhead to pick up the speech of each passenger, those signals are amplified and played back into the cabin through the car audio loudspeaker system. This system has to deal with two main problems, electro-acoustic coupling and noise amplification. To overcome these problems, CCCS makes use of echo cancellation and noise reduction techniques. In this work a discussion about the echo cancellation implementation with simulation results about the performance of the proposed echo canceller and noise reduction stage are shown.