Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data clocking
Patent
1979-01-25
1980-07-22
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data clocking
360 78, G11B 509, G11B 2110
Patent
active
042142792
ABSTRACT:
This invention is directed to a system for generating clock signals from a source signal having two harmonically related and phase coherent frequencies such as shown in U.S. Pat. No. 3,534,344 (Santana) and U.S. Pat. No. 3,879,753 (Dunn). The clock system employs a pair of synchronous demodulators for generating a phase error signal to control a voltage controlled oscillator (VCO). The source signal is applied to a pair of synchronous demodulators, each of which is supplied with a different carrier frequency. The output of each demodulator represents the area of the signal being demodulated. The output of each demodulator is zero and a null condition exists when the system is in a phase locked condition. At a non-locked condition, the output of one demodulator has multiple null points. The function of the second demodulator is to resolve the ambiguity between the desired and undesired null points. Carrier signals are generated under control of the VCO by dividing the output of the VCO signal to obtain carrier signals having the appropriate relationship to the source signal.
REFERENCES:
patent: 3534344 (1970-10-01), Santana
patent: 3879753 (1975-05-01), Dunn
patent: 4092683 (1978-05-01), Andrews, Jr. et al.
Canney Vincent P.
Cummins R. E.
International Business Machines - Corporation
LandOfFree
Clocking system for servo signal having two or more harmonically does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Clocking system for servo signal having two or more harmonically, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Clocking system for servo signal having two or more harmonically will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2181060