Digital filter switch for data receiver

Details Digital filter switch for data receiver Digital filter switch for data receiver

1986-07-03

1988-02-16

Safourek, Benedict V.

Pulse or digital communications

Repeaters

Testing

375 80, 329110, H03D 300

Patent

active

047260416

ABSTRACT:
A digital filter switch for use with a data receiver incorporates first and second squaring units connected to the outputs of first and second band-pass filters tuned to the separation and character frequencies in a signal transmission. The outputs of the squaring units are interconnected via an adder to the input of a low-pass filter, which produces the output data signal.

REFERENCES:
patent: 3689844 (1972-09-01), Buzzard et al.
patent: 3803501 (1974-04-01), Jones, Jr.
patent: 3858117 (1974-12-01), Denny
patent: 3921075 (1975-11-01), Denny
patent: 4506228 (1985-03-01), Kammeyer
patent: 4543532 (1985-09-01), Kasser
patent: 4583048 (1986-04-01), Gumacos et al.
NTZ 37/7 (1984) pp. 414-419, "Digitaltechnik", W. Demmer, P. Draheim, R. Gutsmann, Digitale Signalverarbeitung von FM-modulierten Signalen.
IEEE Transactions Communications Com-29, 1981, pp. 1061-1065, "Approximate FM Demodulation Using Zero Crossings", R. G. Wiley.

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