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.
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References in periodicals archive ?
The new models support SIP for sending and receiving voice over an IP network, T.38 real-time fax relaying for VoIP equipment interoperability, voice activity detection for silence compression, comfort noise generation for a more natural speaking experience, and 5.3 Kbps voice compression for maximizing bandwidth.--Multi-Tech Systems
The algorithms may, in the event of packet loss, replay the last packet, insert comfort noise, interpolate, etc.