Digital demodulator

Details Digital demodulator Digital demodulator

1980-07-18

1982-01-26

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

H03K 1324

Patent

active

043131034

ABSTRACT:
A digital demodulator for converting PCM data from PSK to NRZ-L and to Bi.phi.-L. The demodulator is composed of standard integrated logic circuits. The key to the demodulation function is a pair of cross-coupled one-shot multivibrators 11 and 12 which with a flip-flop 13 produce the NRZ-L. In order to generate Bi.phi.-L, the PSK carrier is constrained to be 2.sup.N times the data bit rate. If NRZ-L is all that is required, the circuitry is greatly simplified and the 2.sup.N times bit rate constraint can be removed from the carrier. A flip-flop 15, an OR gate 14, and AND gate 16 and a binary counter 17 generate the bit rate clock BTCK for the NRZ-L. The remainder of the circuitry is for converting the NRZ-L and BTCK into Bi.phi.-L.

REFERENCES:
patent: 3047853 (1962-07-01), Machol
patent: 3970945 (1976-07-01), Knapp

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