5 The SAD Algorithm
26.4513GPPCodec for Enhanced Voice Services (EVS)TSVoice Activity Detection (VAD)
The Enhanced Voice Services codec signal activity detection (SAD) module described in the present document consists of three sub-SAD modules; SAD1, SAD2 and SAD3.
SAD1 and SAD2 are combined initially to provide an efficient preliminary activity decision. This preliminary decision is then modified by the third sub-SAD module, SAD3, depending upon the codec mode of operation.
The efficient preliminary activity output is used as the final SAD decision for the AMR-WB IO modes, while the activity output with SAD3 is used as the final SAD decision for all other bit-rates.
Sub-clause 5.1.12 in [3] describes the operation of the SAD and the algorithms involved in the three sub-SAD modules in detail.
Annex A (informative):
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