Patent US4229824A successfully refreshed from Google Patents.
US4229824A
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Method and apparatus for synchronizing electrical signals
Assignee: Cubic Corp
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Filing: 1978-07-21
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Granted: 1980-10-21
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Expires: 1998-07-21
Abstract
Abstract In the disclosed method and apparatus, a local generator signal is initially generated with a phase that is arbitrary with respect to the input signal. Subsequently, the phase difference between any two successive bits of these signals is measured. Then the phase of the local generator signal is changed in a direction which decreases the measured difference by an amount proportional to the measured difference divided by the total number of phase measurements made. This produces a new local generator signal. These phase measuring and phase changing steps are repeated multiple times, each time using the most recently produced new local generator signal to produce another new local generator signal. By this sequence, the total phase shift from the initially generated local generator signal after N phase shifts are made is identical to the average of the N corresponding phase differences between the initially generated local generator signal and the input signal.
Inventors
- 👤 John En
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:00
CPC Classifications
H; H04; H04L; H04L7/00; H04L7/02; H04L7/033; H04L7/0331; H04L7/0337
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
165 words
A method of synchronizing a local generator signal with an input signal wherein said local generator signal consists of a plurality of nondistorted bits having one predetermined period, and wherein said input signal consists of a plurality of bits which nominally are of said one predetermined period but which actually are distorted therefrom, said method including the steps of; initially generating said local generator signal with a phase that is arbitrary with respect to said input signal; measuring the phase difference between any two successive bits in said local generator signal and said input signal; changing the phase of said local generator signal in a direction which decreases said measured difference by an amount proportional to said measured phase difference divided by the total number of phase measurements made to thereby produce a new local generator signal; and repeating said measuring step and said phase changing step multiple times, each time using the most recently produced new local generator signal as said local generator signal.
Claim 2
Independent Claim
165 words
A method of synchronizing a local generator signal with an input signal wherein said local generator signal consists of a plurality of nondistorted bits having one predetermined period, and wherein said input signal consists of a plurality of bits which nominally are of said one predetermined period but which actually are distorted therefrom, said method including the steps of; initially generating said local generator signal with a phase that is arbitrary with respect to said input signal; measuring the phase difference between any two successive bits in said local generator signal and said input signal; changing the phase of said local generator signal in a direction which decreases said measured difference by an amount proportional to said measured phase difference divided by the total number of phase measurements made to thereby produce a new local generator signal; and repeating said measuring step and said phase changing step multiple times, each time using the most recently produced new local generator signal as said local generator signal.
Claim 3
Dependent Claim
40 words
A method according to claim 1, wherein said phase changing step is performed by changing the phase of said local generator by a quantized amount proportional to said measured phase difference divided by the total number of phase measurements made.
Claim 4
Dependent Claim
30 words
A method according to claim 1, wherein said phase changing step is performed on the condition that said total number of phase measurements made is less than a predetermined limit.
Claim 5
Dependent Claim
24 words
A method according to claim 1, wherein said generating step is performed by generating said local generator signal with an alternating one-zero bit pattern.
Claim 6
Dependent Claim
34 words
A method according to claim 1, wherein said input signal is of a predetermined bit pattern, and wherein said generating step is performed by generating said local generator signal with the same predetermined pattern.
Claim 7
Dependent Claim
153 words
Apparatus for producing a local generator signal in synchronization with an input signal wherein said local generator signal consists of a plurality of non-distorted bits having one predetermined period, and wherein said input signal consists of a plurality of bits which nominally are of said one predetermined period but which actually are distorted therefrom, said apparatus including: means for generating said local generator signal with a phase that is modifiable with respect to said input signal in response to control signals applied thereto; means for measuring the phase difference between any two successive bits in the signal produced by said means for generating said input signal; and means for producing said control signals such that said means for generating modifies said phase of said local generator signal in a direction which decreases said measured difference by an amount proportional to said measured phase difference divided by the total number of phase measurements made.
Claim 8
Dependent Claim
153 words
Apparatus for producing a local generator signal in synchronization with an input signal wherein said local generator signal consists of a plurality of non-distorted bits having one predetermined period, and wherein said input signal consists of a plurality of bits which nominally are of said one predetermined period but which actually are distorted therefrom, said apparatus including: means for generating said local generator signal with a phase that is modifiable with respect to said input signal in response to control signals applied thereto; means for measuring the phase difference between any two successive bits in the signal produced by said means for generating said input signal; and means for producing said control signals such that said means for generating modifies said phase of said local generator signal in a direction which decreases said measured difference by an amount proportional to said measured phase difference divided by the total number of phase measurements made.
Claim 9
Dependent Claim
38 words
Apparatus according to claim 6 wherein said means for generating includes a tapped delay line having a plurality of outputs, with said outputs being connected to respective logical AND gates for selection in response to said control signals.
Claim 10
Dependent Claim
68 words
Apparatus according to claim 7 wherein said means for measuring includes a plurality of triggerable flip-flop means for generating output signals having a pulsewidth representative of said phase differences between successive bits, and wherein said means for producing said control signals includes counting means coupled to receive said output signals for generating counts representative of said pulsewidths times selectable frequencies F1, F1/2, F1/3 F1/4 . . . .
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-21 | 1984-04-21 | 1984-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-21 | 1988-04-21 | 1988-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-21 | 1992-04-21 | 1992-10-21 | $7700.00 | Window Closed / Lapsed |