A voice activity detector using the chi-square test

Beena Ahmed, W. Harvey Holmes

Research output: Contribution to journalConference article

11 Citations (Scopus)


This paper proposes a voice activity detector (VAD) that makes the speech/noise classification by applying the statistical chi-square test to each frame. It also uses a continuous update of the background noise estimate. The speech is first enhanced using a noise reduction system, with noise estimates also obtained with the help of the chisquare test. The noise-reduced signal is decomposed into sub-bands, and the chi-square test is used again in another form to compare the observed signal distribution to the estimated noise distribution. If the chi-square test determines that they are close, the frame is declared to be noise, otherwise speech. The performance of this VAD was found to be significantly superior to several benchmark VADs, with accuracies above 89% even at a SNR of 0 dB, which is up to 25% better than the others.

Original languageEnglish
Pages (from-to)I625-I628
JournalICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
Publication statusPublished - 28 Sep 2004
EventProceedings - IEEE International Conference on Acoustics, Speech, and Signal Processing - Montreal, Que, Canada
Duration: 17 May 200421 May 2004

ASJC Scopus subject areas

  • Software
  • Signal Processing
  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'A voice activity detector using the chi-square test'. Together they form a unique fingerprint.

  • Cite this