US3857103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System and device to compare the phase and frequency between electrical signals
Assignee: Telettra SpA
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Filing: 1972-12-07
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Granted: 1974-12-24
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Expires: 1992-12-07
Abstract
Abstract A system for comparing the phase and frequency between a pair of periodic signals which are converted to pulse trains, such as by squaring circuits, processed in separate channels to clock these signals which undergo cycle suppression in common, as well as decoding the clocked pulse trains which decoded signals are provided to a flip-flop and subsequently to a converter which relates the potential value of output signal to the phase difference between the periodic input signals in accordance with a non-decreasing monotonic function which is linear between a maximum and minimum value above or below, respectively, a phase difference greater than or less than the phase difference corresponding to said respective maximum and minimum output potential values.
Inventors
- 👤 G Grazia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:32
CPC Classifications
H; H03; H03D; H03D13/00; H03D13/001
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
401 words
A system for discriminating frequency and measuring a phase difference between a pair of periodic signals each having an associated frequency and phase comprising means for obtaining first and second pulse trains from said first and second periodic signals, respectively; first and second gating means connected to said pulse train obtaining means for respectively controlling the provision of said first and second pulse trains from said pulse train obtaining means; first and second counting chain means respectively connected to said first and second gating means outputs for respectively providing a time framing to said first and second pulse trains to provide time framed output signals therefrom; common comparator means connected to said first and second counting chain means outputs; first and second decoder means connected in parallel to said first and second counting means outputs respectively; cycle suppressor means connected to said comparator means output and to said first and second pulse obtaining means outputs and said first and second gating means outputs for receiving signals corresponding to the last count of said first and second counting chains for sampling the comparison between said first and second signals in the last count of each sampling interval, said cycle suppressor means output beng connected in a feedback path to said first and second gating means inputs for providing inhibit signals thereto to inhibit the provision of said first and second pulse trains to said first and second counting chain means respectively; bistable means having an input connected in common to said first and second decoder means outputs and to said first and second gating means outputs; and converter means connected to said bistable means output for providing an output signal whose potential value varies in response to tHe phase difference between the first and second periodic signals in accordance with a non-decreasing monotonic function having a predetermined range of values between a maximum and a minimum value of phase difference wherein the output value of the potential value of said output signal is linearly related to phase difference until said maximum value is obtained, said output potential value remaining constant for phase differences greater than the phase difference corresponding to said maximum value and said output potential value is linearly related until said minimum value is obtained, said output potential value remaining constant at said minimum value for phase differences less than the phase difference corresponding to said minimum output potential value.
Claim 2
Independent Claim
401 words
A system for discriminating frequency and measuring a phase difference between a pair of periodic signals each having an associated frequency and phase comprising means for obtaining first and second pulse trains from said first and second periodic signals, respectively; first and second gating means connected to said pulse train obtaining means for respectively controlling the provision of said first and second pulse trains from said pulse train obtaining means; first and second counting chain means respectively connected to said first and second gating means outputs for respectively providing a time framing to said first and second pulse trains to provide time framed output signals therefrom; common comparator means connected to said first and second counting chain means outputs; first and second decoder means connected in parallel to said first and second counting means outputs respectively; cycle suppressor means connected to said comparator means output and to said first and second pulse obtaining means outputs and said first and second gating means outputs for receiving signals corresponding to the last count of said first and second counting chains for sampling the comparison between said first and second signals in the last count of each sampling interval, said cycle suppressor means output beng connected in a feedback path to said first and second gating means inputs for providing inhibit signals thereto to inhibit the provision of said first and second pulse trains to said first and second counting chain means respectively; bistable means having an input connected in common to said first and second decoder means outputs and to said first and second gating means outputs; and converter means connected to said bistable means output for providing an output signal whose potential value varies in response to tHe phase difference between the first and second periodic signals in accordance with a non-decreasing monotonic function having a predetermined range of values between a maximum and a minimum value of phase difference wherein the output value of the potential value of said output signal is linearly related to phase difference until said maximum value is obtained, said output potential value remaining constant for phase differences greater than the phase difference corresponding to said maximum value and said output potential value is linearly related until said minimum value is obtained, said output potential value remaining constant at said minimum value for phase differences less than the phase difference corresponding to said minimum output potential value.
Claim 3
Dependent Claim
72 words
A system in accordance with claim 1 wherein said converter means provides a linearly varying potential value for said output signal for a maximum phase differential having a value which is sufficient to produce a mutual sliding of said first and second signal frequencies less than once every two cycles to enable the detection of a pass condition when one of said signals is gaining one whole cycle between two sampling intervals.
Claim 4
Dependent Claim
61 words
A system in accordance with claim 2 wherein said converter means non-decreasing monotonic function is defined by the expression (2 -1/2 ) fA < fB < (2 /2 -1) fA where fA represents the frequency of said first signal and fB represents the frequency of said second signal, and gamma represents the number of counting cells in said counting chain means.
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) | 1977-12-23 | 1978-06-24 | 1978-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-23 | 1982-06-24 | 1982-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-23 | 1986-06-24 | 1986-12-24 | $7700.00 | Window Closed / Lapsed |