• Title/Summary/Keyword: LSP (Liear Spectrum Pairs)

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Improvement of VAD Performance for the Reduction of the Bit Rate Under the Noise Environment in the G.723.1 (잡음 환경에서의 전송률 감소를 위한 G.723.1 음성활동 검출기 성능 개선에 관한 연구)

  • 김정진;장경아;배명진
    • The Journal of the Acoustical Society of Korea
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    • v.20 no.3
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    • pp.42-47
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    • 2001
  • This paper improves the performance of VAD (Voice Activity Detector) in G.723.1 Annex A 6.3kbps/5.3kbps dual rate speech coder, which is developed for Internet Phone and videoconferencing. The VAD decision is based on a three-level energy threshold. We evaluates for processing time, speech quality, and bit rate. The processing time is reduced due to the accuracy of VAD decision on the silence period. On subjective quality test there is almost no difference compared with the G.723.1. In order to measure the bit rate we count the active speech frame (VAD=1) and we can reduce more bit rate as silence periods are shown.

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