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4.9 Phone-> Voice
Sections Description
Echo Canceller Echo Canceller: To remove acoustic echo from a voice
communication in order to improve the voice quality .
VAD(Voice Activity Detection): Allow IP phone to
detect the presence or absence of human speech
during a call. When detecting period of “silence”,
VAD replaces that silence efficiently with special
packets that indicate silence is occurring. It can
facilitate speech processing, and deactivate some
processes during non-speech section of an audio
session. It can avoid unnecessary coding or
transmission of silence packets in VoIP applications,
saving on computation and network bandwidth.
CNG(Comfort Noise Generation): Allow IP phone to
generate comfortable background noise for voice
communications during periods of silence in a
conversation. It is a part of the silence suppression
or VAD handling for VoIP technology. CNG, in
conjunction with VAD algorithms, quickly responds
when periods of silence occur and inserts artificial
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