Circuit arrangement for establishing weighting coefficients in a

Details Circuit arrangement for establishing weighting coefficients in a Circuit arrangement for establishing weighting coefficients in a

1979-08-23

1980-12-23

Gensler, Paul L.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

307264, 330144, 330284, H04B 314

Patent

active

042413206

ABSTRACT:
An adaptive equalizer for a telecommunication system, designed to process high-frequency signals in a band on the order of 50 MHz, comprises several weighting networks with input connections to respective taps of a delay line and with output connections to a summing amplifier, each weighting circuit having a control input to which a selected corrective voltage is applied. Each weighting network includes a bridge with two arms constituted by respective secondaries of an input transformer and two other arms in the form of indirectly variable resistance elements, specifically photoresistors photoelectrically coupled to a pair of light-emitting diodes, capacitively isolated for direct current from other parts of the bridge. Energization of the control input with corrective analog voltage of either polarity unbalances the bridge by differentially exciting the light-conductive diodes through respective operational amplifiers also receiving feedback signals derived from the voltage drops across the associated photoresistors which are traversed by constant currents.

REFERENCES:
patent: 3436671 (1969-04-01), Fenton et al.
patent: 3624562 (1971-11-01), Fujimura
patent: 3735275 (1973-05-01), Allen et al.

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