Title :
Compensation of speaker directivity in speech recognition using HMM composition
Author :
Giron, Frank ; Minami, Yasuhiro ; Tanaka, Masashi ; Furuya, Ken Ichi
Author_Institution :
Speech & Acoust. Lab., NTT Human Interface Labs., Tokyo, Japan
Abstract :
In hands-free speech recognition the speaker should be able to move freely in front of the speech acquisition device. However, the speech signal is then submitted to variations due to the continuous change of position in the acoustic space. This paper focuses on the role of speaker head rotations as compared with static situations in anechoic conditions. The effect of speaker directivity in speech recognition performance degradation is demonstrated and a compensation method based on HMM composition is proposed to increase the performance
Keywords :
compensation; hidden Markov models; speech recognition; HMM composition; acoustic space; anechoic conditions; compensation method; hands-free speech recognition; performance degradation; speaker directivity; speaker head rotations; speech acquisition device; speech recognition; speech signal; Acoustic devices; Adaptive arrays; Degradation; Delay; Hidden Markov models; Humans; Laboratories; Loudspeakers; Microphone arrays; Speech recognition;
Conference_Titel :
Acoustics, Speech and Signal Processing, 1998. Proceedings of the 1998 IEEE International Conference on
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-4428-6
DOI :
10.1109/ICASSP.1998.674415