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The car radio of the future will be based on digital signal processing techniques. The CAP is one step in this direction. This single chip CMOS device handles all the features and the audio processing that turn a radio into a car radio by means of DSP algorithms. Most of the functions are programmable. This is the chance for the car radio manufacturer to realize his own ideas using standard hardware. The purpose of this paper is to give a brief insight into the major building blocks of this new chip.

Two new CMOS IC's had been developed to realize a car radio audio system based upon digital signal processing techniques. The first chip is doing source switching. A/D and D/A conversion, stereo decoding. ARI decoding and analog volume control. The second is a masc progammed version of a general purpose signalprocessor. This IC realizes audio features like stereo matrix, deemphasis, tone control, ambience enhancement as well as non audio functions like PLL, noise reduction systems, ARI etc. Both chips can be controlled by any microcomputer by means of a slow serial bus.