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 ?
7xx speech codecs, and voice processing software such as call discrimination, echo cancellation, voice activity detection, comfort noise generation, DTMF tone detection and generation, and automatic gain control.
In addition to the high quality compression and echo cancellation, the Wireless Network Compression solution features silence suppression with superior Voice Activity Detection (VAD) and Comfort Noise Generation (CNG), and intelligent packet loss concealment (PLC) with low-delay and non-blocking.
167 acoustic echo canceller, voice activity detection, comfort noise generation, jitter buffer, packet loss concealment, DTMF detection and generation, call progressive analysis, caller ID, RTP/RTCP protocols, SIP call signaling, Call Control Manager, and Multi-Channel System-Level Framework.
726 voice codecs, comfort noise generation, tone handling, acoustic echo cancellation, playback/record capabilities and 3-way audio conferencing support.
0 includes: Acoustic Echo Cancellation (AEC), Acoustic Echo Suppression (AES), Noise Cancellation, Noise Suppression, Voice Activity Detection (VAD), Comfort Noise Generation (CNG), and Automatic Gain Control (AGC).
168-2000 Line Echo Canceller, Voice Activity Detection, Comfort Noise Generation, Jitter Buffer, Packet Loss Concealment, DTMF Tone Detection and Generation, SIP/RTP/RTCP Call Signaling and Control and multichannel system-level framework.
Echo cancellation combined with voice activity detection and comfort noise generation supports guaranteed delivery of toll-quality voice to subscribers.
It also supports Generic Voice Activity Detection (VAD) and Comfort Noise Generation (CNG) and includes a Message Waiting Indicator, Tele-Conferencing, Call Hold and Pulse Dialing.
Comfort noise generation with silence detection and compression allows for optimal use of channel bandwidth.