US3787749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic synchronizing system
Assignee: IWATA ELECTRIC CO
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Filing: 1969-08-20
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Granted: 1974-01-22
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Expires: 1989-08-20
Abstract
Abstract In an automatic synchronizing system comprising a synchronizing circuit including a variable element, a sampling device and a synchronism control circuit which operates to differentiate the output from the sampling device to vary the variable element, to stop the variation of the variable element and to maintain the stopped condition, there is provided a control circuit responsive to the cessation of operation of either one of the synchronizing circuit or the sampling device to start either one of the synchronizing circuit, sampling device and the synchronism control circuit to continue to find a point of synchronism even in the absence of a synchronizing signal for a predetermined interval or even when the amplitude of the synchronizing signal is small. A time axis circuit may be added which may be controlled by the control circuit in the same manner.
Inventors
- 👤 K Uchida
- 👤 N Nakaya
- 👤 K Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:34
CPC Classifications
G; G01; G01R; G01R13/00; G01R13/20; G01R13/22; G01R13/32
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
146 words
In an automatic synchronizing system having a synchronizing circuit including a variable element, a sampling device, and a synchronism control circuit which operates to differentiate the output from said sampling device to vary said variable element in said synchronizing circuit, said synchronism control circuit further operating in response to a minimum in said differentiated output to stop said variation of said variable element upon reaching synchronism and to maintain the stopped condition, the improvement which comprises control circuit means for sensing stopping of operation of either one of said synchronizing circuit and said sampling device and operable in response to said stopping to start at least one of said synchronizing circuit, sampling device or said synchronism control circuit to continue to find a point of synchronism even in the absence of a synchronizing signal for a predetermined interval or even when the amplitude thereof is small.
Claim 2
Dependent Claim
146 words
In an automatic synchronizing system having a synchronizing circuit including a variable element, a sampling device, and a synchronism control circuit which operates to differentiate the output from said sampling device to vary said variable element in said synchronizing circuit, said synchronism control circuit further operating in response to a minimum in said differentiated output to stop said variation of said variable element upon reaching synchronism and to maintain the stopped condition, the improvement which comprises control circuit means for sensing stopping of operation of either one of said synchronizing circuit and said sampling device and operable in response to said stopping to start at least one of said synchronizing circuit, sampling device or said synchronism control circuit to continue to find a point of synchronism even in the absence of a synchronizing signal for a predetermined interval or even when the amplitude thereof is small.
Claim 3
Dependent Claim
166 words
In a sampling device such as a sampling oscilloscope having a synchronizing circuit including a variable element, a sampling device, a time axis circuit and a synchronism control circuit which functions to differentiate the output from said sampling device to vary said variable element in said synchronizing circuit, said synchronizing control circuit also functioning in response to a minimum in said differentiated output to stop said variation of said variable element upon reaching synchronism and to maintain the stopped condition, and an automatic synchronizing system for said sampling device, the improvement comprising control circuit means for sensing stopping of operation of either one of said synchronizing circuit, sampling device and time axis circuit and operable in response to said stopping to start at least one of said synchronizing circuit, sampling device, synchronism control circuit or time axis circuit to continue to find a point of synchronism even in the absence of a synchronizing signal for a predetermined interval or even when the amplitude thereof is small.
Claim 4
Dependent Claim
166 words
In a sampling device such as a sampling oscilloscope having a synchronizing circuit including a variable element, a sampling device, a time axis circuit and a synchronism control circuit which functions to differentiate the output from said sampling device to vary said variable element in said synchronizing circuit, said synchronizing control circuit also functioning in response to a minimum in said differentiated output to stop said variation of said variable element upon reaching synchronism and to maintain the stopped condition, and an automatic synchronizing system for said sampling device, the improvement comprising control circuit means for sensing stopping of operation of either one of said synchronizing circuit, sampling device and time axis circuit and operable in response to said stopping to start at least one of said synchronizing circuit, sampling device, synchronism control circuit or time axis circuit to continue to find a point of synchronism even in the absence of a synchronizing signal for a predetermined interval or even when the amplitude thereof is small.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |