US3742372A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic synchronizing system with repetitive search and rapid acquisition
Assignee: Iwatsu Electric Co Ltd
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Filing: 1969-08-20
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Granted: 1973-06-26
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Expires: 1989-08-20
Abstract
Abstract In a system for deriving a synchronizing output signal by sampling the input signal with the derived output signal, a control signal is derived in response to the sampled asynchronous condition of the input and output signals for adjusting the frequency of the output signal to achieve the synchronous condition. The frequency adjustment progresses over a predetermined range and is reset when it reaches the end of the range. The adjustment is advanced by a time derivative signal derived from the asynchronous condition and is arrested by the time derivative being minimum which corresponds to the synchronous condition.
Inventors
- 👤 K Uchida
- 👤 N Nakaya
- 👤 K Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:22
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/20; G01R13/22; G01R13/32; G11; G11C; G11C27/00; G11C27/02; G11C27/024; G11C27/026
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
159 words
In a method of synchronizing an input signal applied to a triggering circuit with the output signal delivered from said triggering circuit including the steps of providing an adjustable triggering circuit operable to receive an input signal and deliver therefrom an output signal; applying an input signal representative of a triggering input signal to said triggering circuit; sampling and holding a portion of said input signal applied to said triggering circuit to derive a sampled signal; differentiating said sampled signal to obtain a differentiated signal; and varying a variable component of said differentiated signal until the amplitude of said differentiated signal approaches a minimum value thereby obtaining a controlled differentiated signal wherein the improvement comprises: applying said controlled differentiated signal to have modified amplitude that varies inversely with the absolute value of said controlled differentiated signal and as so modified is applied to said triggering circuit to effect synchronization of the trigger circuit output signal with said input signal.
Claim 2
Dependent Claim
159 words
In a method of synchronizing an input signal applied to a triggering circuit with the output signal delivered from said triggering circuit including the steps of providing an adjustable triggering circuit operable to receive an input signal and deliver therefrom an output signal; applying an input signal representative of a triggering input signal to said triggering circuit; sampling and holding a portion of said input signal applied to said triggering circuit to derive a sampled signal; differentiating said sampled signal to obtain a differentiated signal; and varying a variable component of said differentiated signal until the amplitude of said differentiated signal approaches a minimum value thereby obtaining a controlled differentiated signal wherein the improvement comprises: applying said controlled differentiated signal to have modified amplitude that varies inversely with the absolute value of said controlled differentiated signal and as so modified is applied to said triggering circuit to effect synchronization of the trigger circuit output signal with said input signal.
Claim 3
Dependent Claim
30 words
A method according to claim 1, wherein said varying step comprises generating a staircase waveform, and applying said differentiated signal to said staircase waveform to obtain said controlled differentiated signal.
Claim 4
Dependent Claim
155 words
In an improved triggering method for controlling a trigger circuit including the steps of providing a sample and hold circuit for sampling and holding a trigger input signal or a signal synchronized with said trigger input signal; differentiating an output of said sample and hold circuit; providing a synchronization control circuit for controlling a value of a variable element included with said trigger circuit; ceasing control of said value of said variable element when the amplitude of said differentiation circuit reaches a minimum value or a value adjacent to said minimum value; and maintaining said value of said variable in controlled condition; thereby automatically obtaining a synchronized condition; wherein the improvement comprises applying the differentiated output of said sample and hold circuit in said synchronization control circuit with the amplitude varied in accordance with the inverse of absolute value of the differentiated output signal to maintain said value of said variable in said controlled condition.
Claim 5
Dependent Claim
155 words
In an improved triggering method for controlling a trigger circuit including the steps of providing a sample and hold circuit for sampling and holding a trigger input signal or a signal synchronized with said trigger input signal; differentiating an output of said sample and hold circuit; providing a synchronization control circuit for controlling a value of a variable element included with said trigger circuit; ceasing control of said value of said variable element when the amplitude of said differentiation circuit reaches a minimum value or a value adjacent to said minimum value; and maintaining said value of said variable in controlled condition; thereby automatically obtaining a synchronized condition; wherein the improvement comprises applying the differentiated output of said sample and hold circuit in said synchronization control circuit with the amplitude varied in accordance with the inverse of absolute value of the differentiated output signal to maintain said value of said variable in said controlled condition.
Claim 6
Dependent Claim
52 words
An improved triggering method according to claim 3, said synchronization control circuit being a staircase generating circuit applying the amplitude modified output of said differentiation circuit thereto and controlling said value of said variable of said synchronizing circuit by applying an output signal of said staircase generating circuit to said trigger circuit.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |