Realization of three stereo sound tracks in TV band by using fast ADM

A multi-lingual TV system needs to broadcast the video with audio appearing in more than one language. In the receiver it gives option to the viewer to choose the desired language for his audio. This paper reports the realization of a TV channel incorporating six audio tracks needed for transmitting three stereo sounds. Four tracks of the audio are adaptive delta modulated and inserted in the Hsync pulse of composite video signal. In the receiver these pulses are detected and the audio signals of four tracks are recovered. Also, there are two other audio tracks available as in conventional TV with stereo sound resulting in six audio tracks for the TV channel.