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Silence Compression


Silence compression provides way to squeeze redundancy out of the sound files.
Note: Data redundancy is the existence of data that is additional to the actual data.

The silence compression scheme is essential for efficient voice communication systems. It allows significant reduction of transmission band with during a period of silence. The silence compression scheme include a voice activity detection (VAD), a silence insertion descriptor (SID) and comfort noise generator (CNG) module.

Parameters used for silence compression
  • Threshold value
  • The way to encode silence
  • Threshold of recognising start of silence
  • An indication of when silence is over
  • A parameter to get a threshold, which means that there is no silence until or unless there is 3 silence in the rows.
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