We discuss techniques for Voice Activity Detection (VAD) for Voice over Internet Protocol (VoIP). VAD aids in reducing bandwidth requirement of a voice session thereby using bandwidth efficiently. Such a scheme would be implemented in the application Layer. Thus the VAD is independent of the lower layers in the network stack [3]. In this paper, we compare four time-domain VAD algorithms in terms of speech quality, compression level and computational complexity. A comparison of the relative merits and demerits along with the subjective quality of speech after pruning of silence periods is presented for all the algorithms. A quantitative measurement of speech quality for different algorithms is also presented.
Reducing the lnternet trafic is a requirement to shpre the bandwidth wirh many sessions. When circuit switched applications are ported on to the Inferner, bandwidth saving becomes all rhe more prominent. An eficienr adaptable tltreslrold V . (Voice Activiry Detection) for Voice over IP s-ystems are presented in rhispaper. The discussion includes two energy-based algorithm with higher order threshold iefreshirig schemes. The petj6rmance of afl the schemes nrepresented, rhe resulrs bring out clearly the usefulness of rhe schemes for VoIP applications with saving in bandwidth.
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