Automatic equalizer for digital transmission

Details Automatic equalizer for digital transmission Automatic equalizer for digital transmission

1988-03-30

1990-07-24

LaRoche, Eugene R.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

375 12, H04B 314

Patent

active

049437895

ABSTRACT:
This automatic equalizer comprises an automatic gain control circuit (2, 4) tending to keep the peak amplitude of the equalized signal constant, together with a variable equalization network (1) provided with a control input enabling the slope of its gain transfer characteristic to be modified without altering the value of its gain at the half Baud frequency, and a servo-control system for controlling the shaping of the frequency spectrum by controlling said variable equalization network, said servo-control system including a circuit (6) for detecting the mean phase error of zero crossings in the skirts of pulses appearing in the received and equalized digital transmission signal compared with the middles of Baud intervals.

REFERENCES:
patent: 3573667 (1971-04-01), Kao et al.
patent: 4061970 (1977-12-01), Magneron
patent: 4243956 (1981-01-01), Lemoussu et al.
patent: 4352190 (1982-09-01), Hullwegen
patent: 4488126 (1984-12-01), Suthers
Patent Abstracts of Japan, vol. 10, No. 27 (E-378) (2084), Feb. 4, 1986; and JP-A-60 186 130 (Nippon Denshin Denwa Kosha) 9/21/1985.
Patent Abstracts of Japan, vol. 11, No. 117 (E-498) (2564), Apr. 11, 1987; and JP-A-61 264 925 (Matsushita Electric Ind. Co. LTD) 11/22/1986.

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