Demodulators – Amplitude modulation demodulator – Having specific distortion – noise or other interference...
Patent
1979-09-07
1981-05-05
Moore, David K.
Demodulators
Amplitude modulation demodulator
Having specific distortion, noise or other interference...
329103, 329107, 375 87, H03D 318
Patent
active
042661986
ABSTRACT:
A receiving station of a data-transmission system, designed to decode an incoming pulse train in the shape of a differentially biphase-coded carrier wave whose cycles represent respective message bits, includes a phase detector responsive to a presynchronization oscillation preceding an incoming message. The presynchronization signal, in the form of a square wave of half the frequency of the carrier wave, is fed to a phase detector along with a locally generated square wave of carrier-wave frequency. The phase detector, comprising several cascaded flip-flops, determines the relative time position of the local square wave and the presynchronization oscillation with the aid of an Exclusive-OR gate in the input of the first flip-flop and emits a corrective signal shifting the local square wave by half a cycle whenever the leading edges of the latter wave do not coincide with the beginnings of half-cycles of the presynchronization oscillation.
REFERENCES:
patent: 3654564 (1972-04-01), Tisi
patent: 3982195 (1976-09-01), Turner
patent: 4029905 (1977-06-01), Abraham
Moore David K.
Ross Karl F.
Societa Italiana Telecomunicazioni Siemens S.p.A.
LandOfFree
Sampling system for decoding biphase-coded data messages does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Sampling system for decoding biphase-coded data messages, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sampling system for decoding biphase-coded data messages will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-298126