CNG (Comfort Noise Generator)
CNG (Comfort Noise Generator) – During periods of transmit silence, when no packets are sent, the receiver has a choice of what to present to the listener. Muting the channel (playing absolutely nothing) gives the listener the unpleasant impression that the line has gone dead. A receiverside CNG generates a local noise signal that it presents to the listener during silent periods. The match between the generated noise and the true background noise determines the quality of the CNG.
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