US3789408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronous system
Assignee: Furuno Electric Co Ltd
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Filing: 1972-05-15
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Granted: 1974-01-29
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Expires: 1992-05-15
Abstract
Abstract Means for measuring time or phase differences between incoming segmented signals which includes the generation of a segmented reference signal having the same frequency of the incoming signals. A comparator for comparing the phase difference between an incoming signal and the reference signal and means for storing the detected phase difference. Means for producing a control pulse train for dividing said phase difference into n parts where n is the number of segments used for detecting said phase difference and then shifting the phase of each segment of the reference signal by 1/n for each pulse of the control pulse train.
Inventors
- 👤 K Ichihara
- 👤 H Tanaka
- 👤 K Ishida
- 👤 M Handa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:01
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02; G01S1/08; G01S1/20; G01S1/30; G01S1/308
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
181 words
A synchronizing system in a device for measuring the phase difference between a pair of incoming signals having the same frequency and occurring at a predetermined time difference each of said signals being repeated at predetermined intervals, comprising a receiver for receiving said signals, a reference frequency generator for generating reference signal having a constant frequency, a frequency divider for dividing the frequency of said reference signal to produce a synchronous signal having the same frequency as said incoming signals and a comparator for comparing said synchronous signal with the earlier incoming signal to detect a phase difference therebetween, means for storing said detected phase difference until the later incoming signal is received, means for producing a control pulse train which equally divides the period of said time difference into n parts wherein n is proportional to said detected phase difference, and means for shifting the phase of said synchronous signal by 1/n of said detected phase difference at the time of application of said control pulse train whereby the phase difference is cancelled before the later incoming signal is received.
Claim 2
Dependent Claim
181 words
A synchronizing system in a device for measuring the phase difference between a pair of incoming signals having the same frequency and occurring at a predetermined time difference each of said signals being repeated at predetermined intervals, comprising a receiver for receiving said signals, a reference frequency generator for generating reference signal having a constant frequency, a frequency divider for dividing the frequency of said reference signal to produce a synchronous signal having the same frequency as said incoming signals and a comparator for comparing said synchronous signal with the earlier incoming signal to detect a phase difference therebetween, means for storing said detected phase difference until the later incoming signal is received, means for producing a control pulse train which equally divides the period of said time difference into n parts wherein n is proportional to said detected phase difference, and means for shifting the phase of said synchronous signal by 1/n of said detected phase difference at the time of application of said control pulse train whereby the phase difference is cancelled before the later incoming signal is received.
Claim 3
Dependent Claim
144 words
A synchronizing system according to claim 1 wherein said means for producing a control pulse train comprises a second frequency divider for dividing the frequency of said reference signal to produce a clock pulse train, a gate pulse generator for generating a gate pulse train having a period equal to that of said clock pulse and a pulse duration proportional to said detected phase difference under control of the output of said storage means and said clock pulse train, a gate circuit for gating said reference signal under control of said gate pulse train, a pulse counter for counting pulses of the output of said gate circuit and producing a pulse each time a predetermined count is attained, and a phase shifter for shifting said synchronous signal in phase by a predetermined amount each time an output pulse is produced by said pulse counter.
Claim 4
Dependent Claim
101 words
A synchronizing system according to claim 2 wherein said gate signal generator includes a counter for counting the output pulses of said gate circuit, a coincidence gate for comparing the count of said counter circuit with the content of said storage means and producing an output when they coincide with each other, a JK-flip-flop triggered by the clock pulse from said frequency divider and reset by the output of said coincidence gate, said counter circuit being also reset by said output of the coincidence gate and the output of said JK-flip-flop being applied to said gate circuit as the gate pulse.
Claim 5
Dependent Claim
66 words
A synchronizing system according to claim 1 wherein said means for producing a control pulse train comprises an adder and an accumulator, said adder being interconnected with said accumulator to accumulate the content of said storage means under control of said clock pulse from said frequency divider and produce a ''''carry'''' signal and means feeding said ''''carry'''' signal to said phase shifter as the control pulse.
References Cited (Backward Citations)
US3573828A
Cited
US3689925A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-28 | 1977-07-30 | 1978-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-28 | 1981-07-30 | 1982-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-28 | 1985-07-30 | 1986-01-29 | $7700.00 | Window Closed / Lapsed |