10

Audio–Video Buses

This chapter will deal with the main communication networks and buses used in industrial and motor vehicle on-board systems, etc., for audio and video applications.

These applications are structured around conventional digital audio CD players, MP3 compressed digital audio CDs, CD-ROMs containing, for example, data representing road maps for assistance in a navigation system, video games, conventional DVDs, etc. They also include links carrying pure video, in other words images captured by a camera located at the rear of a vehicle, for example, to send information to the instrument panel (reversing camera), reception of coded OFDM digital terrestrial television (DTT) channels, and multiplexing MPEG2 and MPEG4 digital streams from multiple video sources for distribution to different points (e.g. the seats and instrument panel of special vehicles, coaches, aircraft, etc.).

10.1 I2C Bus

10.1.1 General

The I2C bus, developed by Philips Semiconductors, is well established and is still a dominant feature of on-board systems. A vast number of these integrated circuits are produced every year for all kinds of applications. We should remember that this is a synchronous (two communication wires, the first carrying data SDA and second carrying the clock, SCL), multimaster bus and that its initial speed of 100 kbit s has increased progressively to 3.4 Mbit s−1. For further information, I would refer you to many books that I have written on this subject, available from ...

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