US3830981A
Expired / Lapsed
US
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Pulse stuffing control circuit for reducing jitter in tdm system
Assignee: Nortel Networks Technology Corp
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Filing: 1973-04-02
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Granted: 1974-08-20
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Expires: 1993-04-02
Abstract
Abstract A pulse stuffing control circuit, for reducing waiting time jitter in a time division multiplex system, in which a sampling window is provided to determine the need for a stuffed pulse. The use of the window creates a higher frequency jitter component in the transmitted pulse stream which can be readily filtered out at the receiving terminal.
Inventors
- 👤 J Gruber
- 👤 P Chow
- 👤 J Houghton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:54
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/06; H04J3/07; H04J3/073
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
156 words
In a time-division multiplex transmission system, utilizing pulse stuffing techniques to effect synchronization between a plurality of asynchronous pulse streams and a higher repetition rate pulse stream; a pulse stuffing control circuit comprising: means for generating a control signal, for controlling the periodic insertion of synchronization information, which identifies the location of stuffed pulses, in the higher repetition rate pulse stream; means for comparing during regularly periodic window intervals the relative phase of one of the asynchronous pulse streams with that of the higher repetition rate pulse stream for generating a stuffing signal in response to the phase shift therebetween exceeding a selected threshold, and means responsive to said control signal and said stuffing signal to delete selected pulses from said higher repeTition rate pulse stream to generate a stuffing controlled pulse stream having the same repetition rate as the higher repetition rate pulse stream and the same pulse count as said one asynchronous pulse stream.
Claim 2
Dependent Claim
156 words
In a time-division multiplex transmission system, utilizing pulse stuffing techniques to effect synchronization between a plurality of asynchronous pulse streams and a higher repetition rate pulse stream; a pulse stuffing control circuit comprising: means for generating a control signal, for controlling the periodic insertion of synchronization information, which identifies the location of stuffed pulses, in the higher repetition rate pulse stream; means for comparing during regularly periodic window intervals the relative phase of one of the asynchronous pulse streams with that of the higher repetition rate pulse stream for generating a stuffing signal in response to the phase shift therebetween exceeding a selected threshold, and means responsive to said control signal and said stuffing signal to delete selected pulses from said higher repeTition rate pulse stream to generate a stuffing controlled pulse stream having the same repetition rate as the higher repetition rate pulse stream and the same pulse count as said one asynchronous pulse stream.
Claim 3
Dependent Claim
24 words
A pulse stuffing control circuit as defined in claim 1 in which the comparison interval is substantially equal to that of said synchronization information.
Claim 4
Dependent Claim
29 words
A pulse stuffing control circuit as defined in claim 2 in which said phase shift has a time interval substantially equal to the period of the multiplexed pulse stream.
Claim 5
Dependent Claim
194 words
In a time-division multiplex transmission system, utilizing pulse stuffing techniques to effect synchronization between a plurality of pulse streams and a higher repetition rate pulse stream; a pulse stuffing control circuit comprising: means responsive to a multiplex control clock for generating a control pulse stream at a fraction of said clock repetition rate, said control pulse stream having periodic phase delays equal to one multiplex control clock interval for inserting synchronization information pulses or spaces, which identify the location of stuffed pulses, in the higher repetition rate pulse stream; means for comparing, during regularly periodic window intervals, the relative phase shift of one of said plurality of pulse streams with that of said control pulse stream to generate a stuffing signal when said phase shift exceeds that between adjacent pulses, the comparison interval being substantially equal to that between two adjacent phase delays; and means responsive to the stuffing signal for blocking a pulse in said control pulse stream so as to generate a stuffing controlled pulse stream having the same pulse count as that of said one pulse stream and the same repetition rate as that of said higher repetition rate pulse stream.
Claim 6
Dependent Claim
194 words
In a time-division multiplex transmission system, utilizing pulse stuffing techniques to effect synchronization between a plurality of pulse streams and a higher repetition rate pulse stream; a pulse stuffing control circuit comprising: means responsive to a multiplex control clock for generating a control pulse stream at a fraction of said clock repetition rate, said control pulse stream having periodic phase delays equal to one multiplex control clock interval for inserting synchronization information pulses or spaces, which identify the location of stuffed pulses, in the higher repetition rate pulse stream; means for comparing, during regularly periodic window intervals, the relative phase shift of one of said plurality of pulse streams with that of said control pulse stream to generate a stuffing signal when said phase shift exceeds that between adjacent pulses, the comparison interval being substantially equal to that between two adjacent phase delays; and means responsive to the stuffing signal for blocking a pulse in said control pulse stream so as to generate a stuffing controlled pulse stream having the same pulse count as that of said one pulse stream and the same repetition rate as that of said higher repetition rate pulse stream.
Claim 7
Dependent Claim
85 words
In a time-division multiplex transmission system, utilizing pulse stuffing techniques to effect synchronization between a plurality of asynchronous pulse streams and a higher repetition rate pulse stream; a pulse stuffing control circuit comprising: phase comparison means for periodically determining, during a fixed predetermined portion of the total available time, the need for stuffed pulses in one of said plurality of asynchronous pulse streams; and means responsive to said phase comparison means for controlling the insertion of said stuffed pulses in said one asynchronous pulse stream.
Claim 8
Dependent Claim
85 words
In a time-division multiplex transmission system, utilizing pulse stuffing techniques to effect synchronization between a plurality of asynchronous pulse streams and a higher repetition rate pulse stream; a pulse stuffing control circuit comprising: phase comparison means for periodically determining, during a fixed predetermined portion of the total available time, the need for stuffed pulses in one of said plurality of asynchronous pulse streams; and means responsive to said phase comparison means for controlling the insertion of said stuffed pulses in said one asynchronous pulse stream.
Claim 9
Dependent Claim
124 words
In a time-division multiplex transmission system, utilizing pulse stuffing techniques to effect synchronization between a plurality of asynchronous pulse streams and a higher repetition rate pulse stream; a pulse stuffing control circuit comprising: means for comparing during regularly periodic window intervals the relative phase of one of the asynchronous pulse streams with that of the higher repetition rate pulse stream for generating a stuffing signal in response to the phase shift therebetween exceeding a selected threshold; and means responsive to said stuffing signal to delete selected pulses from said higher repetition rate pulse streams to generate a stuffing control pulse stream having the same repetition rate as the higher repetition rate pulse stream and the same pulse count as said one asynchronous pulse stream.
Claim 10
Dependent Claim
124 words
In a time-division multiplex transmission system, utilizing pulse stuffing techniques to effect synchronization between a plurality of asynchronous pulse streams and a higher repetition rate pulse stream; a pulse stuffing control circuit comprising: means for comparing during regularly periodic window intervals the relative phase of one of the asynchronous pulse streams with that of the higher repetition rate pulse stream for generating a stuffing signal in response to the phase shift therebetween exceeding a selected threshold; and means responsive to said stuffing signal to delete selected pulses from said higher repetition rate pulse streams to generate a stuffing control pulse stream having the same repetition rate as the higher repetition rate pulse stream and the same pulse count as said one asynchronous pulse stream.
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) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |