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Open Access

Multi-Channel Sub-Band Speech Recognition

EURASIP Journal on Advances in Signal Processing20012001:569196

Received: 22 December 2000

Published: 1 March 2001


Two distinct fields of research into robust speech recognition are the use of microphone arrays for signal enhancement and the use of independent frequency sub-band models for robust recognition. In this article, we propose and investigate the integration of these two techniques on two different levels. First, a broad-band beamforming microphone array allows for natural integration with sub-band speech recognition as the beamformer is implemented as a combination of band-limited sub-arrays. Rather than recombining the sub-array outputs to give a single enhanced output, we fuse the output of separate hidden Markov models trained on each sub-array frequency band. Second, a dynamic sub-band weighting algorithm is proposed in which the cross- and auto-spectral densities of the microphone inputs are used to estimate the reliability of each frequency band. The proposed multi-channel sub-band system is evaluated on an isolated digit recognition task and compared to both a standard full-band microphone array system and a single channel sub-band system.


microphone arraysub-bandbeamformingspeech recognition

Authors’ Affiliations

Speech Research Laboratory, RCSAVT, School of EESE, Queensland University of Technology, Brisbane, Australia


© McCowan and Sridharan 2001