Title :
A microphone array system for speech recognition
Author :
Kiyohara, Kenji ; Kaneda, Yutaka ; Takahashi, Satoshi ; Nomura, Hiroaki ; Kijima, J.
Author_Institution :
NTT Human Interface Labs., Musashino, Japan
Abstract :
This paper proposes a microphone array system which realizes the following important functions for speech recognition: (i) SNR improvement, (ii) flat spectrum response for an arbitrary speaker position, and (iii) speech period detection in noisy speech. This microphone array system features time delay estimation using prewhitening signal processing, an optimally weighted delay-and-sum array, and speech period detection (called MLD) based on the level difference between signals before and after array processing. Word recognition experiments performed in the presence of crowd noise demonstrate that the proposed system has great robustness against noise than does the system with a conventional directional microphone and a speech period detection method
Keywords :
acoustic noise; acoustic signal processing; acoustic transducer arrays; array signal processing; delays; microphones; spectral analysis; speech processing; speech recognition; MLD; SNR improvement; array processing; crowd noise; flat spectrum response; microphone array system; noisy speech; optimally weighted delay and sum array; prewhitening signal processing; speech period detection; speech recognition; time delay estimation; word recognition experiments; Acoustic noise; Array signal processing; Delay effects; Delay estimation; Detectors; Filters; Microphone arrays; Signal to noise ratio; Speech processing; Speech recognition;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1997. ICASSP-97., 1997 IEEE International Conference on
Conference_Location :
Munich
Print_ISBN :
0-8186-7919-0
DOI :
10.1109/ICASSP.1997.599606