Energy Efficient Implementation of G.729 for Wireless VoIP Application
Source: University of Maryland
This paper describes the formatting guidelines for ACM SIG Proceedings. Traditionally silence in VoIP applications is detected by a VAD algorithm after G.729 compression, both have high computational and energy cost. However, such cost on silence frames will be completely wasted because the detected silence frames will not be sent to receiver. The paper proposes to use a Silence Pre-Detection (SPD) module to detect silence frames directly from the voice sample in order to reduce energy. The adaptive SPD algorithm has little hardware requirement and low computation cost. However, it can detect 59% of the silence, which results in 34% energy saving. The impact to quality of speech is almost unnoticeable.