Gordon AndersonTechnical TrainingTandberg Television Ltd
2.6 Sound in Syncs
‘Sound in Syncs’ (SIS) is the name for the process of placing digitally encoded sound into the line sync portion of a composite TV signal. Mono SIS (then just called SIS) was developed in the late 1960s by the BBC and was the first hybrid multiplex of analogue and digital signals in common use in broadcasting.
SIS confers all the benefits of digitising a waveform (improved signal-to-noise, low distortion, no degradation with distance) on the audio signal. In addition, SIS also ‘marries’ the audio and video signals together, so that they can travel through a complex contribution or distribution system without becoming inadvertently separated and without ‘lip-sync’ problems ...
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