Receive side pulse width controlled adaptive equalizer

Details Receive side pulse width controlled adaptive equalizer Receive side pulse width controlled adaptive equalizer

1993-03-02

1994-06-21

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 98, 333 18, H04B 320

Patent

active

053234235

ABSTRACT:
Pulse width controlled adaptive equalizers are provided for telecommunication signals which are routed over coaxial cables. The adaptive equalizers operate on the premise that a coaxial cable degrades a telecommunications signal by widening the pulse of the signal and decreasing the amplitude. The longer the cable is, the wider the pulse gets. Thus, by detecting the width of the pulse against a desired width, and feeding back the difference to a variable filter which can correct the pulse width, a pulse width controlled adaptive equalizer can be provided. The preferred pulse width controlled adaptive equalizer includes: a variable filter block for filtering input signals to provide frequency dependent gain based on the amplitude of a control signal; a comparator block for comparing the filtered bipolar signal against a reference value based on the peak amplitude of the signal to provide a pulsed output; a pulse width detector which senses the pulse width of the pulsed output and outputs a signal indicative of the pulse width; and a feedback filter which filters the signal indicative of the pulse width and provides a control signal to the variable filter in order to control the frequency dependent gain of the filter.

REFERENCES:
patent: 3755736 (1973-08-01), Kaneko et al.
patent: 3781720 (1973-12-01), Mueller
patent: 4707840 (1987-11-01), Nakayama
"A New Family of Active Variable Equalizers" by Cordell, IEEE Transaction on Circuits and Systems, vol. CAS-29, No. 5, May 1982, pp. 316-322.
"Inductorless Variable Equalizers" by Brglez, IEEE Transactions on Circuits and Systems, vol. CAS-22, No. 5, May 1975, pp. 415-418.
"Variable Equalizer with Differential Amplifiers" by Shida et al. IEEE Transactioins on Circuits and Systems, vol. CAS-24, No. 6, Jun. 1977, pp. 318-320.

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