3

Source coding: compression of video and audio signals

In the preceding chapter, we explained why compression was an absolute must in order to be able to broadcast TV pictures in a channel of acceptable width. A spectrum bandwidth comparable to conventional analogue broadcasts (6-8 MHz for cable or terrestrial broadcasts, 27-36 MHz for satellite) implies in practice maximum bit-rates of the order of 30-40 Mb/s, with the necessary error correction algorithms and modulation schemes, which are explained in Chapters 6 and 7.

We will now examine the principles and various steps of video and audio compression which allow these bit-rates (and in fact much less) to be achieved, and which are currently being used in the various video/audio compression ...

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