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Patent US4122397A successfully refreshed from Google Patents.
US4122397A
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Apparatus and method for timing recovery from a pseudo-ternary signal
Assignee: AG Communication Systems Corp
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Filing: 1977-02-17
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Granted: 1978-10-24
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Expires: 1997-02-17
Abstract
Abstract A circuit for obtaining clock timing information from an equalized pseudo-ternary signal, such as is exemplified by a signal using the modified duobinary code, includes a level selector in which the signal is sliced at a predetermined amplitude. A slicing level reference circuit provides the threshold voltage for the level selector so that only the upper level portion of the original is obtained for processing. This upper level portion is applied to an amplifier and then to a frequency selection circuit which is tuned to the clock frequency of the original signal.
Inventors
- 👤 Jay A. Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:11
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/14; G11B20/1488; G11B20/1492; H; H04; H04L; H04L7/00; H04L7/02; H04L7/027
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
95 words
Apparatus for recovering timing information from a pseudo-ternary signal which comprises: means for establishing a reference voltage having an amplitude slightly greater than the individual signal pulses; level selecting means having an input coupled to receive said reference voltage, having a second input coupled to receive the pseudo-ternary signal, and providing at an output the peaks of the pseudo-ternary signal which have an amplitude greater than the reference voltage; and frequency selecting means, having an output, having an input connected to the output of said level selector, and providing a timing signal at the output.
Claim 2
Dependent Claim
95 words
Apparatus for recovering timing information from a pseudo-ternary signal which comprises: means for establishing a reference voltage having an amplitude slightly greater than the individual signal pulses; level selecting means having an input coupled to receive said reference voltage, having a second input coupled to receive the pseudo-ternary signal, and providing at an output the peaks of the pseudo-ternary signal which have an amplitude greater than the reference voltage; and frequency selecting means, having an output, having an input connected to the output of said level selector, and providing a timing signal at the output.
Claim 3
Dependent Claim
54 words
Apparatus in accordance with claim 1 wherein said means for establishing a reference voltage further comprises: a peak detector; means for coupling the pseudo-ternary signal to the input of said peak detector; and a voltage divider having an input coupled to said peak detector and having an output connected to said level detecting means.
Claim 4
Dependent Claim
40 words
Apparatus in accordance with claim 2 wherein said level selecting means further comprises: rectifier means; means coupling the pseudo-ternary signal to said rectifier means; slicing means; and means for coupling the output of said rectifier means to said slicing means.
Claim 5
Dependent Claim
112 words
The apparatus in accordance with claim 2 wherein said level selecting means further comprises: a first slicing means having an output, having one input coupled to receive said pseudo-ternary signal and a second input coupled to the output of said voltage divider; inverting means having an input coupled to receive said pseudo-ternary signal; a second slicing means having an output, having one input connected to the output of said inverting means and a second input coupled to the output of said voltage divider; and summing means having one input connected to the output of said first slicing means and having a second input connected to the output of said second slicing means.
Claim 6
Dependent Claim
35 words
The apparatus in accordance with claim 2 wherein said level selecting means further comprises: a slicer having one input connected to receive the pseudo-ternary signal and a second input coupled to said level selecting means.
Claim 7
Dependent Claim
32 words
Apparatus in accordance with claim 3, wherein said frequency selecting means further comprises: a narrow-band bandpass filter having a center frequency substantially equal to the pulse repetition rate of the pseudo-ternary signal.
Claim 8
Dependent Claim
32 words
Apparatus in accordance with claim 4 wherein said frequency selecting means further comprises: a narrow-band bandpass filter having a center frequency substantially equal to the pulse repetition rate of the pseudo-ternary signal.
Claim 9
Dependent Claim
32 words
Apparatus in accordance with claim 5 wherein said frequency selecting means further comprises: a narrow-band bandpass filter having a center frequency substantially equal to the pulse repetition rate of the pseudo-ternary signal.
Claim 10
Dependent Claim
62 words
Apparatus in accordance with claim 6 wherein said frequency selecting means further comprises: a low Q adjustable tuned circuit having an input coupled to the output of said slicing means and having an output; and amplifying means having an input connected to the output of said low Q tuned circuit and having an output connected to the input of said bandpass filter.
Claim 11
Dependent Claim
58 words
Apparatus in accordance with claim 7 wherein said frequency selecting means further comprises: a low Q adjustable tuned circuit having an input coupled to the output of said summing means; and amplifying means having an input connected to the output of said low Q tuned circuit and having an output connected to the input of said bandpass filter.
Claim 12
Dependent Claim
62 words
Apparatus in accordance with claim 8 wherein said frequency selecting means further comprises: a low Q adjustable tuned circuit having an input coupled to the output of said slicing means and having an output; and amplifying means having an input connected to the output of said low Q tuned circuit and having an output connected to the input of said bandpass filter.
Claim 13
Dependent Claim
123 words
Apparatus for recovering a clock timing information from an equalized pseudo-ternary waveform which comprises: reference voltage means having an input coupled to receive the equalized pseudo-ternary waveform and providing at an output a reference voltage having an amplitude which is greater than the peak amplitude of an individual equalized pulse of said pseudo-ternary signal, said amplitude being less than the peak amplitude of the equalized pseudo-ternary waveform; level selecting means having one input coupled to receive the equalized pseudo-ternary waveform, a second input coupled to receive the output of said reference voltage means, and providing at its output the upper level amplitude portion of said waveform; and frequency selecting means having an output, and having an input coupled to said level selecting means.
Claim 14
Dependent Claim
123 words
Apparatus for recovering a clock timing information from an equalized pseudo-ternary waveform which comprises: reference voltage means having an input coupled to receive the equalized pseudo-ternary waveform and providing at an output a reference voltage having an amplitude which is greater than the peak amplitude of an individual equalized pulse of said pseudo-ternary signal, said amplitude being less than the peak amplitude of the equalized pseudo-ternary waveform; level selecting means having one input coupled to receive the equalized pseudo-ternary waveform, a second input coupled to receive the output of said reference voltage means, and providing at its output the upper level amplitude portion of said waveform; and frequency selecting means having an output, and having an input coupled to said level selecting means.
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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) | 1981-10-23 | 1982-04-24 | 1982-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-23 | 1986-04-24 | 1986-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-23 | 1990-04-24 | 1990-10-24 | $7700.00 | Window Closed / Lapsed |