This appendix deals with external synchronous reset capability in systems using external VAD/DTX/CNG, e.g. CMEs (Circuit Multiplication Equipments) in conjunction with ITU-T G.729 main body and ITU-T G.729 Annexes A and C.
The use of the external synchronous reset is intended for systems using external VAD/DTX/CNG in conjunction with ITU-T G.729 main body and ITU-T G.729 Annexes A or C. In this situation, the use of external synchronous reset is generally preferable to obtain the best possible speech quality in noisy scenarios where VAD is used. This is especially true when an aggressive VAD is used. When the external VAD has long-enough hangover period (i.e. a less-aggressive VAD), the quality increase of external synchronous reset case compared with "no reset" case is less perceivable.