Electrical audio signal processing systems and devices – One-way audio signal program distribution – Public address system
Patent
1988-04-27
1990-04-10
Harkcom, Gary V.
Electrical audio signal processing systems and devices
One-way audio signal program distribution
Public address system
381 50, G10L 706, G10L 918
Patent
active
049167430
ABSTRACT:
A circuit for pattern matching on the frequency axis which inlcudes a first transformation section having an adaptive filter which is generally identical to an adaptive finite impulse response filter, but with its delay elements having been replaced by all-pass filters. The first transformation section performs frequency transformation on an input signal and is characterized by utilizing as tap coefficients for the adaptive filter, linear predictive analysis coefficients of the input speech signal. The first transformation section outputs linear predictive analysis coefficients of the frequency transformed input signal. A second transformation section is similar to the first transformation section but the tap coefficients of its adaptive filter are linear predictive analysis coefficients of a reference speech signal. A control section calculates a distance between the respective linear predictive analysis coefficients output from the first and second transformation sections, calculates controlling parameters of the filters of the all-pass filters of the transformation sections so as to minimize this distance, and generates a pattern matching residual output on the frequency axis.
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Ando Hiromi
Fukasawa Atsushi
Sato Shin'ichi
Sato Takuro
Suzuki Yukio
Harkcom Gary V.
Knepper David D.
OKI Electric Industry Co., Ltd.
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