Digital demodulator on a semiconductor base

Details Digital demodulator on a semiconductor base Digital demodulator on a semiconductor base

1979-03-09

1980-12-16

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329104, 375 94, H03K 1301

Patent

active

042400350

ABSTRACT:
A demodulator is disclosed in which the input for a digital signal to be demodulated is connected to at least two consecutive, pulse-controlled, bistable flip-flops. An auxiliary signal, produced with the aid of an oscillator and corresponding with the carrier frequency on which the signal to be demodulated is based, is connected to a receiver side via a first input of a NAND-gate and is connected to a pulse input of a first flip-flop cell via this NAND-gate. An output of the first flip-flop cell corresponding with this pulse input is not only connected to the one input of a second NAND-gate but also to the pulse input of a second flip-flop cell and whose Q-output is connected to the second input of the second NAND-gate. The Q-output of the second flip-flop cell is used as a signal output of the demodulator. Finally, the signal to be demodulated is simultaneously connected to the reset inputs of the two flip-flop cells.

REFERENCES:
patent: 3737895 (1973-06-01), Cupp et al.
patent: 3982195 (1976-09-01), Turner
patent: 4153814 (1979-05-01), Burgert
Schulenburg, "Einfache Fernsteuerung fur 9 Kanale", Elektronik, 1975, vol. 10, pp. 104, 105.

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