Adaptive equalizer

Details Adaptive equalizer Adaptive equalizer

1982-02-01

1984-10-16

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

333 18, 375 17, H04B 314

Patent

active

044779143

ABSTRACT:
In a digital system, especially where PCM coded speech is conveyed over twisted pair cables optimized for analogue speech, a pulse is received distorted, the distortion being especially bad on the trailing edge of the pulse. This decays slowly enough to cause intersymbol interference with the next pulse.
This is overcome by applying the signal from an amplifier (11), FIG. 4, to one input of a subtractor (12) via a delay and attenuation circuit (13-15) and to the other input of the subtractor directly. The delay (13) is such as to optimize the peak of the received pulse, and the attentuation level is calculated to cancel out the tail of the received pulse so that it is zero at the center of the sampling point of the next bit.

REFERENCES:
patent: 3378847 (1968-04-01), Grover et al.
patent: 3502986 (1970-03-01), Lucky
patent: 3870996 (1975-03-01), Miller

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