Voice Activity Detection for Speech Enhancement Applications

This paper describes a study of noise-robust voice activity detection (VAD) utilizing the periodicity of the signal, full band signal energy and high band to low band signal energy ratio. Conventional VADs are sensitive to a variably noisy environment especially with low SNR, and also result in cutting off unvoiced regions of speech as well as random oscillating of output VAD decisions. To overcome these problems, the proposed algorithm first identifies voiced regions of speech and then differentiates unvoiced regions from silence or background noise using the energy ratio and total signal energy. The performance of the proposed VAD algorithm is tested on real speech signals. Comparisons confirm that the proposed VAD algorithm outperforms the conventional VAD algorithms, especially in the presence of background noise.

[1]  M.T. Manzuri,et al.  A robust voice activity detection based on wavelet transform , 2008, 2008 Second International Conference on Electrical Engineering.

[2]  R. Tucker,et al.  Voice activity detection using a periodicity measure , 1992 .

[3]  E. Shlomot,et al.  ITU-T Recommendation G.729 Annex B: a silence compression scheme for use with G.729 optimized for V.70 digital simultaneous voice and data applications , 1997, IEEE Commun. Mag..

[4]  G. Schroder,et al.  Robust voice-activity detection based on the wavelet transform , 1997, 1997 IEEE Workshop on Speech Coding for Telecommunications Proceedings. Back to Basics: Attacking Fundamental Problems in Speech Coding.

[5]  John Mason,et al.  Robust voice activity detection using cepstral features , 1993, Proceedings of TENCON '93. IEEE Region 10 International Conference on Computers, Communications and Automation.

[6]  Performance Evaluation of Pitch Detection Algorithms , .

[7]  Lawrence R. Rabiner,et al.  A pattern recognition approach to voiced-unvoiced-silence classification with applications to speech recognition , 1976 .

[8]  Spectral Entropy.  SPECTRAL ENTROPY: AN ALTERNATIVE INDICATOR FOR RATE ALLOCATION? , 1994 .