Arrangement for equalizing the variable attenuation of a signal

Details Arrangement for equalizing the variable attenuation of a signal Arrangement for equalizing the variable attenuation of a signal

1984-03-05

1986-04-08

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

333 18, 364724, G06F 1531, H03H 1704

Patent

active

045817472

ABSTRACT:
Disclosed is a digital arrangement utilizing linear predictive coding for equalizing over a desired frequency spectrum the variable attenuation of a voice-frequency message signal transmitted on a communication line. The arrangement comprises a digital signal processor, program memories for storing program instruction sets, and a data memory for storing samples of a spectrally white test signal that has been variably attenuated by the line. Under control of one instruction set that incorporates linear predictive coding, the processor uses the stored test samples to calculate the reflection coefficients of the line that characterize the variable attenuation of a signal on the line. Under the control of the other instruction set, the processor functions as a digital inverse filter employing the calculated reflection coefficients for equalizing over the desired frequency spectrum the variable attenuation of a voice-frequency message signal transmitted on the line.

REFERENCES:
patent: 3662108 (1972-05-01), Flanagan
patent: 3662115 (1972-05-01), Saito
patent: 4377793 (1983-03-01), Horna
patent: 4398262 (1983-08-01), Williams
patent: 4454590 (1984-06-01), Belt
Lawrence R. Rabiner et al., Digital Processing of Speech Signals, Prentice-Hall, Inc., Englewood Cliffs, N.J., 1978, p. 416.
R. B. Blake et al., "Voice-Frequency Transmission Treatment for Special-Service Telephone Circuits", The Bell System Technical Journal, vol. 60, No. 7, Part 2, Sep. 1981, pp. 1585-1619.

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