US3683345A
Expired / Lapsed
US
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Phase-responsive circuits
Assignee: English Electric Co Ltd
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Filing: 1969-12-23
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Granted: 1972-08-08
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Expires: 1989-12-23
Abstract
Abstract This invention relates to a circuit which provides an indication, on a display, of phase changes in signals from a variable phase signal source. The phase of these signals may vary in dependence upon displacement of, for example, a machine slide. The number of clock pulses generated by a clock pulse source between the occurrence of the leading edge of a reference signal and the occurrence of the next leading edge of the variable phase signal gives a measure of the phase relationship between the two signals. Changes in phase between successive cycles of the variable phase signal are detected by a comparator and a detector which cause a number of counting pulses, equal to the difference between the clock pulse counts of the two successive cycles, to be fed to a reversible counter, together with a ''''Count Up'''' or a ''''Count Down'''' instruction. The number in the counter and in the display gives a measure of the resultant phase shift relative to the phase at the time of setting the counter. The number of clock pulses generated per cycle of the reference signal may be chosen so that the number displayed gives the machine slide displacement directly in inches or metric units.
Inventors
- 👤 Kenneth Milford Faulkes
- 👤 Alan Michael Hayes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:39
CPC Classifications
G; G01; G01R; G01R25/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
225 words
A phase-responsive circuit for indicating changes in phase of a variable phase signal source, comprising a source 1,3,4 of regularly spaced pulses for producing a reference output signal, a variable phase signal source 2 responsive to said reference output signal of the source for generating a signal having the same frequency as the source but having a variable phase relative to the reference output signal, a latch pulse former 6 to detect the number of said regularly spaced pulses from said source generated between the occurrence of a selected point of a cycle of said reference output signal and the occurrence of a corresponding point of a concurrent cycle of the generated signal of said variable phase signal source, first storage means 7 to store a pulse count of a number of said regularly spaced pulses detected by said latch pulse former driving a currently occurring cycle of the generated signal of the variable phase signal source and thereby producing an output when a change in phase has been detected, second storage means 8 to receive the output of said first storage means, a comparator 9 responsive to a count of the regularly spaced pulses and the count of said second storage means, a means 10 responsive to the latch pulse former and the comparator to indicate changes of phase of the variable signal source.
Claim 2
Dependent Claim
225 words
A phase-responsive circuit for indicating changes in phase of a variable phase signal source, comprising a source 1,3,4 of regularly spaced pulses for producing a reference output signal, a variable phase signal source 2 responsive to said reference output signal of the source for generating a signal having the same frequency as the source but having a variable phase relative to the reference output signal, a latch pulse former 6 to detect the number of said regularly spaced pulses from said source generated between the occurrence of a selected point of a cycle of said reference output signal and the occurrence of a corresponding point of a concurrent cycle of the generated signal of said variable phase signal source, first storage means 7 to store a pulse count of a number of said regularly spaced pulses detected by said latch pulse former driving a currently occurring cycle of the generated signal of the variable phase signal source and thereby producing an output when a change in phase has been detected, second storage means 8 to receive the output of said first storage means, a comparator 9 responsive to a count of the regularly spaced pulses and the count of said second storage means, a means 10 responsive to the latch pulse former and the comparator to indicate changes of phase of the variable signal source.
Claim 3
Dependent Claim
44 words
A circuit as claimed in claim 1 in which a counting pulse former means 11 is responsive to said means being gated in response to said means to allow or inhibit the passage of said regularly spaced pulses from said source to a load.
Claim 4
Dependent Claim
14 words
The circuit as claimed in claim 2 wherein said load is a reversible counter.
Claim 5
Dependent Claim
34 words
The circuit as claimed in claim 3 wherein a display 13 in response to the reversible counter indicates a change in count and hence a change in phase of the variable phase signal source.
Claim 6
Dependent Claim
77 words
The circuit as claimed in claim 1 wherein said source includes a clock pulse source 3 and a counter 4, the predetermined number of clock pulses of said clock pulse source being N, and in which said predetermined number has either of two values having the ration N to 1.016N, or N to 1.27N, so that said differeNce in the number of pulses detected during successive cycles represents the displacement in either inch or metric units, respectively.
Claim 7
Dependent Claim
30 words
The circuit as claimed in claim 1 wherein said source includes a clock pulse source 3 that generates a continuous train of pulses fed to a free running counter 4.
Claim 8
Dependent Claim
47 words
The circuit as claimed in claim 6 wherein said source includes a reference signal source 1 responsive to the control of counter 4 and a miximum count control 5 such that each cycle of the reference signal is completed when the counter 4 is reset to 0.
Claim 9
Dependent Claim
31 words
A circuit as claimed in claim 1 wherein a display is responsive to said means to indicate a change in count and a change in phase of the variable signal source.
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) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |