comfort noise

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comfort noise

A very low-volume tone injected into the receiving end of voice over IP (VoIP) communications to prevent the listener from thinking the line went dead. There was always a slight background noise in analog phone lines. However, digital methods have replaced analog, and without the comfort noise, the line can seem disconnected during pauses in conversation, or when someone is on hold (without music) or when the other party puts the phone down for a moment. See TDM-to-packet conversion.
References in periodicals archive ?
729 but requires less computation, and G729B, which is a silence compression scheme with Discontinuous Transmission (DTX), Voice Activity Detection (VAD), Comfort Noise Generator (CNG) and Silence Insertion Descriptor (SID).
GIPS AEC delivers the highest possible voice quality with an adaptive filter, non-linear processor (NLP), comfort noise generator and control system.
GIPS AEC for IP Phones ensures the highest quality with an adaptive filter, non-linear processor (NLP), comfort noise generator and a control system.
GIPS Voice Enhancement Solutions include Voice Activity Detector (VAD), Discontinuous Transmission (DTX) and Comfort Noise Generator (CNG) modules.
167 and includes an adaptive filter, non-linear processor (NLP), double-talk detector, comfort noise generator and a control system, all of which are crucial in a high-performance AEC.