Apparatus and method for adaptive amplitude equalization

Details Apparatus and method for adaptive amplitude equalization Apparatus and method for adaptive amplitude equalization

1988-02-29

1990-02-06

Griffin, Robert L.

Pulse or digital communications

Repeaters

Testing

375 98, 333 18, H04B 310

Patent

active

048993654

ABSTRACT:
Apparatus and method for amplitude equalization of a signal channel such as a telephone line that does not require adjustments at the customer's premises. The equalization circuit receives a plurality of alignment signals at predetermined frequencies from the signal channel, and measures the amplitude of each alignment signal. The amplitudes are used to determine analog and digital filter transfer function coefficients. Thereafter, input signals on the signal channel are filtered such that the combined amplitude response of the signal channel and filter is substantially flat over a designated frequency range.

REFERENCES:
patent: 3731199 (1973-05-01), Tazaki et al.
patent: 4606043 (1986-08-01), Aprille, Jr. et al.
patent: 4615037 (1986-09-01), Adler
patent: 4718073 (1988-01-01), Takaoka
patent: 4768204 (1988-08-01), Zeiss
patent: 4785418 (1988-11-01), Pearce et al.

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