Passenger in-car communication enhancement

The expression passenger in-car communication refers to the conversation (speech communication) of the car passengers while driving. In particular, the communication between different seat rows is difficult due to road noise and the acoustic situation within a car. A system which enhances the speech intelligibility is desirable for safety and comfort reasons. We discuss the basic building blocks and design issues of such an in-car communication system, particularly with regard to the acoustic conditions in a car.