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- Comfort_noise abstract "Comfort noise (or comfort tone) is synthetic background noise used in radio and wireless communications to fill the artificial silence in a transmission resulting from voice activity detection or from the audio clarity of modern digital lines.Some modern telephone systems (such as wireless and VoIP) use voice activity detection (VAD), a form of squelching where low volume levels are ignored by the transmitting device. In digital audio transmissions, this saves bandwidth of the communications channel by transmitting nothing when the source volume is under a certain threshold, leaving only louder sounds (such as the speaker's voice) to be sent. However, improvements in background noise reduction technologies can occasionally result in the complete removal of all noise. Although maximizing call quality is of primary importance, exhaustive removal of noise may not properly simulate the typical behavior of terminals on the PSTN system.The result of receiving total silence, especially for a prolonged period, has a number of unwanted effects on the listener, including the following: the listener may believe that the transmission has been lost, and therefore hang up prematurely. the speech may sound \"choppy\" (see noise gate) and difficult to understand. the sudden change in sound level can be jarring to the listener.To counteract these effects, comfort noise is added, usually on the receiving end in wireless or VoIP systems, to fill in the silent portions of transmissions with artificial noise. The noise generated is at a low but audible volume level, and can vary based on the average volume level of received signals to minimize jarring transitions.In modern VoIP productsTemplate:Such as?, users may control whether they want comfort noise enabled or disabled.As part of the RTP audio video profile, RFC 3389 defines a standard for distributing comfort noise information in VoIP systems.A similar concept is that of sidetone, the effect of sound that is picked up by a telephone's mouthpiece and introduced (at low level) into the earpiece of the same handset, acting as feedback.During the siege of Leningrad, the beat of a metronome was used as comfort noise on the Leningrad radio network, indicating that the network was still functioning.Many radio stations broadcast birdsong, city-traffic or other atmospheric comfort noise during periods of deliberate silence. For example, in the UK, silence is observed on Remembrance Sunday, and London's quiet city ambiance is used. This is to reassure the listener that the station is on-air, but primarily to prevent silence detection systems at transmitters from automatically starting backup tapes of music (designed to be broadcast in the case of transmission link failure).".
- Comfort_noise wikiPageExternalLink vad_cng.php.
- Comfort_noise wikiPageID "2189975".
- Comfort_noise wikiPageLength "4307".
- Comfort_noise wikiPageOutDegree "34".
- Comfort_noise wikiPageRevisionID "644764347".
- Comfort_noise wikiPageWikiLink Autonomous_sensory_meridian_response.
- Comfort_noise wikiPageWikiLink Background_noise.
- Comfort_noise wikiPageWikiLink Bandwidth_(computing).
- Comfort_noise wikiPageWikiLink Category:Mobile_telecommunications.
- Comfort_noise wikiPageWikiLink Category:Noise.
- Comfort_noise wikiPageWikiLink Category:Radio_technology.
- Comfort_noise wikiPageWikiLink Category:VoIP_terminology_&_concepts.
- Comfort_noise wikiPageWikiLink Digital_audio.
- Comfort_noise wikiPageWikiLink Discontinuous_transmission.
- Comfort_noise wikiPageWikiLink Metronome.
- Comfort_noise wikiPageWikiLink Noise_gate.
- Comfort_noise wikiPageWikiLink Public_switched_telephone_network.
- Comfort_noise wikiPageWikiLink RTP_audio_video_profile.
- Comfort_noise wikiPageWikiLink Radio.
- Comfort_noise wikiPageWikiLink Radio_network.
- Comfort_noise wikiPageWikiLink Radio_receiver.
- Comfort_noise wikiPageWikiLink Remembrance_Sunday.
- Comfort_noise wikiPageWikiLink Saint_Petersburg.
- Comfort_noise wikiPageWikiLink Sidetone.
- Comfort_noise wikiPageWikiLink Siege_of_Leningrad.
- Comfort_noise wikiPageWikiLink Silence.
- Comfort_noise wikiPageWikiLink Sound.
- Comfort_noise wikiPageWikiLink Squelch.
- Comfort_noise wikiPageWikiLink Talkspurt.
- Comfort_noise wikiPageWikiLink Transmitter.
- Comfort_noise wikiPageWikiLink Voice_activity_detection.
- Comfort_noise wikiPageWikiLink Voice_over_IP.
- Comfort_noise wikiPageWikiLink Volume.
- Comfort_noise wikiPageWikiLink Wireless.
- Comfort_noise wikiPageWikiLinkText "CNG".
- Comfort_noise wikiPageWikiLinkText "Comfort Noise Generation".
- Comfort_noise wikiPageWikiLinkText "Comfort noise".
- Comfort_noise wikiPageWikiLinkText "comfort noise".
- Comfort_noise wikiPageUsesTemplate Template:Refimprove.
- Comfort_noise wikiPageUsesTemplate Template:Such_as%3F.
- Comfort_noise subject Category:Mobile_telecommunications.
- Comfort_noise subject Category:Noise.
- Comfort_noise subject Category:Radio_technology.
- Comfort_noise subject Category:VoIP_terminology_&_concepts.
- Comfort_noise hypernym Noise.
- Comfort_noise type Band.
- Comfort_noise type Concept.
- Comfort_noise comment "Comfort noise (or comfort tone) is synthetic background noise used in radio and wireless communications to fill the artificial silence in a transmission resulting from voice activity detection or from the audio clarity of modern digital lines.Some modern telephone systems (such as wireless and VoIP) use voice activity detection (VAD), a form of squelching where low volume levels are ignored by the transmitting device.".
- Comfort_noise label "Comfort noise".
- Comfort_noise sameAs Q445104.
- Comfort_noise sameAs Komfortrauschen.
- Comfort_noise sameAs 통신_소음.
- Comfort_noise sameAs m.06tn5p.
- Comfort_noise sameAs Комфортный_шум.
- Comfort_noise sameAs Bekvämlighetsbrus.
- Comfort_noise sameAs Q445104.
- Comfort_noise wasDerivedFrom Comfort_noise?oldid=644764347.
- Comfort_noise isPrimaryTopicOf Comfort_noise.