Digitizing circuit for demodulated digital data signals

Details Digitizing circuit for demodulated digital data signals Digitizing circuit for demodulated digital data signals

1990-06-21

1991-06-11

Grimm, Siegfried H.

Demodulators

Frequency shift keying or minimum shift keying demodulator

Including logic element (e.g., logic gate or flip-flop

307268, 328164, 375 88, 375 99, H04L 2714

Patent

active

050235621

ABSTRACT:
The apparatus is for digitizing demodulated frequency shift key modulated data signals, and comprises a differentiating circuit arranged to receive the demodulated data signal, and produce differentiated pulses at an output thereof. First and second comparators are arranged to receive the differentiated pulses, and compare the pulses with respective reference voltages to generate output pulses when pulses above and below the respective reference voltages are detected. The outputs of the comparators are connected to the set and reset inputs respectively of a flip-flop, causing a digitized form of the input demodulated signal to be generated at an output of the flip-flop.

REFERENCES:
patent: 3879665 (1975-04-01), Carlow et al.

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