Akuvox SP-R50P, User Manual

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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 noise until voice
activity resumes. The insertion of artificial noise gives
the illusion of a constant transmission stream, so that