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US 4,190,807 AGranted
Sampled error phaselock or frequencylock systems
AssigneeRockwell International Corporation
InventorRobert J. Weber
Life of this patent
Estimating the term…
Abstract
Phaselock or frequencylock systems employ sampling means and memory means to effect control. Adjustments in phase or frequency are made according to stored signals and the stored signals are updated in accordance with samples of an error indicative signal.
Claims15
The phaselock system comprising:
- first means for providing a first carrier signal;
- second means for supplying a second carrier signal in the form of a train of pulses of carrier signal;
- controllable third means for effecting chanbge in the phase of said second carrier in accordance with a signal .sigma..sub.c ;
- fourth means, including phase detector means, for providing a signal indicative of difference between (.eta..sub.l (t)+.mu.) and .eta..sub.2 (t) where .eta..sub.1 (t) and .eta..sub.2 (t) are the phases of said first and second carrier signals respectively, and .mu. is a constant phase angle;
- fifth means for storing all at one time, and serially outputting at each pulse occurrence, 1st through Uth individual control signals each of which comprises a component of .sigma..sub.c, U being a predetermined integer .gtoreq.2;
- and
- sixth means for (a) effecting 1st through Uth successive intervals during each of the pulses of the pulse train, said 1st through Uth intervals corresponding, respectively, to said 1st through Uth control signals, (b) sampling the difference indicative signal during at least one of these U intervals of a train pulse P.sub.j, and (c) updating the appropriate one of the U control signals in accordance with the sample such that the updated control signal effects, only at pulses succeeding P.sub.j, a change in .eta..sub.2 (t) which brings it nearer to (.eta..sub.1 (t)+.mu.).
4 more elements
The phaselock system comprising:
- first means for providing a first carrier signal having phase .phi..sub.1 (t);
- angularly modulatable second means for providing a second carrier signal whose phase .phi..sub.2 (t) is to eventually follow .phi..sub.3 (t) where .phi..sub.3 (t)=.phi..sub.1 (t)+.theta.(t) and .theta.(t) is a prescribed function of time;
- third means, including phase detector means, for providing a signal indicative of difference between .phi..sub.2 (t) and .phi..sub.3 (t);
- fourth means for storing all at one time, and serially outputting, 1st through Uth individual control signals for producing adjustment of said angularly modulatable means and thus of .phi..sub.2 (t), U being a predetermined integer .gtoreq.2, and the serial outputting of 1st through Uth control signals reoccurring at predetermined times;
- and
- fifth means for sampling the difference indicative signal during at least one control signal adjustment of .phi..sub.2 (t) and updating this control signal in accordance with the sample such that the updated control signal, at reoccurrence of the fourth means serial outputting, effects an adjustment of .phi..sub.2 (t) which brings it nearer to .phi..sub.3 (t).
3 more elements
The system comprising:
- angularly modulatable means for providing a carrier signal whose phase .phi..sub.a (t) is to eventually follow .phi..sub.b (t) where .phi..sub.b (t) is a prescribed function of time,
- means for providing a signal which is a function of difference between .phi..sub.a (t) and .phi..sub.b (t), and
- means for (i) storing all at one time, and serially outputting, 1st through Uth individual control signals for producing adjustment of said angularly modulatable means and thus of .phi..sub.a (t), U being a predetermined integer .gtoreq.2, and the serial outputting of 1st through Uth control signals reoccurring at predetermined times, (ii) sampling the difference indicative signal during at least one control signal adjustment of .phi..sub.a (t), and (iii) updating this control signal in accordance with the sample such that the updated control signal, at reoccurrence of the serial outputting, effects an adjustment of .phi..sub.a (t) which brings it nearer to .phi..sub.b (t).
The system comprising:
- angularly modulatable means for providing a carrier signal having frequency .omega..sub.x (t) which is to eventually follow .omega..sub.y (t) where .omega..sub.y (t) is a prescribed function of time,
- means for providing a signal which is a function of difference between .omega..sub.x (t) and .omega..sub.y (t), and
- means for (i) storing all at one time, and serially outputting, 1st through Uth individual control signals for producing adjustment of said angularly modulatable means and thus of said carrier signal, U being a predetermined integer .gtoreq.2, and the serial outputting of 1st through Uth control signals reoccurring at predetermined times, (ii) sampling the frequency difference dependent signal during at least one control signal adjustment of the carrier, and (iii) updating this control signal in accordance with the sample such that the updated control signal, at reoccurrence of the serial outputting, effects an adjustment of the carrier so as to reduce the difference between .omega..sub.x (t) and .omega..sub.y (t).
Dependencies are inferred from the claim text.