Auto-adaptive amplitude-equalizing arrangement for digital radio

Details Auto-adaptive amplitude-equalizing arrangement for digital radio Auto-adaptive amplitude-equalizing arrangement for digital radio

1984-02-07

1985-12-17

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 16, 333 18, H03H 703

Patent

active

045596352

ABSTRACT:
An auto-adaptive amplitude-equalizing arrangement for digital radio links having an intermediate-frequency signal input, a transversal filter and a circuit for the control of the filter. The transversal filter comprises a delay circuit providing, with respect to the intermediate-frequency signal input, a delay T equal to (2k-1)/4F.sub.c, where k is a positive integer and F.sub.c the center frequency of the intermediate-frequency signal, a first and a second multiplication circuit whose inputs are respectively connected to the output of the delay circuit and to the intermediate-frequency signal input, and an adder connected to the outputs of the multiplication circuits. The first multiplication circuit may be an analog amplifier whose gain is controlled by the control circuit, or may comprise a fixed-gain amplifier and a digitally controlled attenuator, the control inputs of the attenuator being connected to the count outputs of an up/down-counter, which is controlled by a zero comparator connected to the output of the control circuit.

REFERENCES:
patent: 4003006 (1977-01-01), Mandeville et al.
patent: 4052671 (1977-10-01), Lange
patent: 4283693 (1981-08-01), Saenz
patent: 4325068 (1982-04-01), Mercer
patent: 4344176 (1982-08-01), Qureshi

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