Time-varying feature space preprocessing procedure for telephone

Details Time-varying feature space preprocessing procedure for telephone Time-varying feature space preprocessing procedure for telephone

1995-12-29

1998-06-09

MacDonald, Allen R.

Data processing: speech signal processing, linguistics, language

Speech signal processing

Recognition

704233, 704226, G10L 506, G10L 900

Patent

active

057651248

ABSTRACT:
An improved speech recognition system, in which transformation process parameters are generated in response to selected characteristics derived from speech inputs obtained from both carbon and linear microphones. The transformation process parameters are utilized in conjunction with selected digitized speech models to improve the speech recognition process based on the carbon microphone property of suppressing speech spectral energy for low energy invoiced sounds, and also for low energy regions of the spectrum between formant peaks for voices sounds.

REFERENCES:
Anastasakos et al, Adaptation to new microphones using tied-mixture normalization, ICASSP, Apr. 1994.
Acero, A, Stern R M, Robust speech recognition by normaliz. of the acoustic space, ICASSP, May 1991.
Kao, Y. H. et al, Toward Vocabulary Independent Telephone Speech Recognition, ICASSP, Apr. 1994.
Lerner S., Mazor, B., Telephone Channel Normalization for Autom. Speech Recog., ICASSP, Mar. 1992.

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