9 Adaptive Multi-Rate Wideband speech codec voice activity detection

26.1713GPPAdaptive Multi-Rate - Wideband (AMR-WB) speech codecGeneral descriptionSpeech codec speech processing functionsTS

The adaptive multi-rate wideband VAD function is described in [6].

The input to the VAD is the input speech itself together with a set of parameters computed by the adaptive multi-rate wideband speech encoder. The VAD uses this information to decide whether each 20 ms speech coder frame contains speech or not.

The VAD algorithm is described in [6], and the corresponding C-code is defined in [3]. The verification of compliance to [6]. is achieved by use of digital test sequences applied to the same interface as the test sequences for the speech codec.