Speech filter for digital electronic communications

Details Speech filter for digital electronic communications Speech filter for digital electronic communications

1999-09-13

2000-12-26

Dorvil, Richemond

Data processing: speech signal processing, linguistics, language

Speech signal processing

For storage or transmission

704200, 704201, 381 717, 379406, 370282, 370286, 370290, G10L 1914, H04B 321, H04M 1253, H04M 908

Patent

active

061673714

ABSTRACT:
A filter device filters a speech signal that has a frequency spectrum featuring slopes separated by valleys. The filter device amplifies the slopes and attenuates the valleys for improving the intelligibility of the signal. The filter device includes a predictive speech signal analysis circuit for determining a polynomial whose coefficients are Linear Predictive Coding (LPC) parameters. The filter device further includes a calculator for synthesizing a digital post filter of the zeroes/poles type based on this polynomial. An extraction circuit of the filter device taps values of poles by extracting roots of the polynomial, and an interpolation circuit between the values of poles derives therefrom the zero values of the post filter.

REFERENCES:
patent: 4617676 (1986-10-01), Jayant et al.
patent: 4868867 (1989-09-01), Davidson et al.
patent: 4969192 (1990-11-01), Chen et al.
patent: 5864798 (1999-01-01), Miseki et al.
A. El-Jaroudi, J. Makhoul, "Discrete All-Pole Modeling," IEEE Transactions on Signal Processing, Feb. 1991.
B. Zeng, T. Laasko, Y. Neuvo, "Error Feedback for Floating-Point Cascade-Form Digital Filters", International Conference on Acoustics, Speech and Signal Processing, Apr., 1991.

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