Pre-processing system for speech recognition

Details Pre-processing system for speech recognition Pre-processing system for speech recognition

1978-02-24

1980-10-07

Morrison, Malcolm A.

179 1D, 179 1P, G10L 100

Patent

active

042270464

ABSTRACT:
A pre-processing system for a speech recognition system nullifies the distortion in a received signal caused by the transmission line by forming a normalized received signal whereby the distortion is cancelled: the received signal is spectrally averaged to form a mean spectrum which is used to adjust a filter to a characteristic inverse to the distortion; this filter then filters the received signal to form the normalized received signal s.sub.j '(.omega.,t)=S.sub.j (.omega.,t)/S.sub.j (.omega.) which is equal to the normalized source signal =S.sub.i (.omega.,t)/S.sub.i (.omega.).

REFERENCES:
patent: 3803357 (1974-04-01), Sacks
patent: 4025721 (1977-05-01), Graupe et al.
patent: 4032710 (1977-06-01), Martin et al.
patent: 4052559 (1977-10-01), Paul et al.
patent: 4058676 (1977-11-01), Wilkes et al.
F. Terman, "Radio Engineers' Handbook", McGraw-Hill, pp. 244, 245.

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