US3689697A
Expired / Lapsed
US
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Synchronizing system
Assignee: General Electric Co
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Filing: 1971-03-15
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Granted: 1972-09-05
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Expires: 1991-03-15
Abstract
Abstract In a time-division multiplex, pulse-code modulation system, each sequence of four binary pulses representing information are converted to a group of three ternary pulses for transmission to a receiver. At the receiver, the same groups of three ternary pulses are converted back to four binary pulses for decoding and demultiplexing. Both conversions are made in accordance with a code in which three ternary zeros do not appear in any correct ternary grouping. If the receiver is out of frame, a condition which can be indicated by framing binary pulses, the receiver sends an alarm to the distant transmitter to cause the distant transmitter to send a special code of ternary pulses having a large number of three zeros in sequence. If, at the receiver, three zeros appear in a ternary pulse group, the grouping is shifted by one ternary pulse. If three zeros subsequently appear in a group, the grouping is again shifted by one ternary pulse. After no more than two such shifts, the grouping will be correct and the proper ternary-to-binary conversion, followed by decoding and demultiplexing, can take place.
Inventors
- 👤 James S Smith Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:54
CPC Classifications
H; H04; H04J; H04J3/00; H04J3/02; H04J3/06; H04J3/0602; H04L; H04L25/00; H04L25/38; H04L25/40; H04L25/49; H04L25/4917; H04L25/4923; H04L25/4925
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
183 words
In a time-division multiplex, pulse-code modulation carrier system wherein groups of a selected number of binary pulses are converted in accordance with a selected code by a transmitter to groups of a selected number of sequential ternary pulses for transmission, and wherein received ternary pulses are converted in accordance with said selected code by a receiver to binary pulses for decoding and demultiplexing, a system for a receiver for synchronizing the grouping of said ternary pulses for conversion to binary pulses to correspond with the grouping of said pulses at said transmitter, said synchronizing system comprising: a. converter means for grouping each sequence of said selected number of receiver ternary pulses in a group; b. means connected to said converter means for scanning the ternary pulses in each of said groups and for producing a signal in response to the presence of a selected combination of scanned ternary pulses in each of said scanned groups; c. and means connected to said scanning means and to said converter means for shifting the grouping of said ternary pulses in response to said selected combination signal.
Claim 2
Dependent Claim
183 words
In a time-division multiplex, pulse-code modulation carrier system wherein groups of a selected number of binary pulses are converted in accordance with a selected code by a transmitter to groups of a selected number of sequential ternary pulses for transmission, and wherein received ternary pulses are converted in accordance with said selected code by a receiver to binary pulses for decoding and demultiplexing, a system for a receiver for synchronizing the grouping of said ternary pulses for conversion to binary pulses to correspond with the grouping of said pulses at said transmitter, said synchronizing system comprising: a. converter means for grouping each sequence of said selected number of receiver ternary pulses in a group; b. means connected to said converter means for scanning the ternary pulses in each of said groups and for producing a signal in response to the presence of a selected combination of scanned ternary pulses in each of said scanned groups; c. and means connected to said scanning means and to said converter means for shifting the grouping of said ternary pulses in response to said selected combination signal.
Claim 3
Dependent Claim
24 words
The synchronizing system of claim 1 wherein said selected number of binary pulses comprises four, and said selected number of ternary pulses comprises three.
Claim 4
Dependent Claim
21 words
The synchronizing system of claim 1 wherein said shifting means shifts the grouping of said ternary pulses by one ternary pulse.
Claim 5
Dependent Claim
19 words
The synchronizing system of claim 1 wherein said shifting means require at least two of said selected combination signals.
Claim 6
Dependent Claim
38 words
The synchronizing system of claim 1 wherein said selected number of binary pulses comprises four, said selected number of ternary pulses comprises three, and said shifting means shifts the grouping of said ternary pulses by one ternary pulse.
Claim 7
Dependent Claim
36 words
The synchronizing system of claim 1 wherein said selected number of binary pulses comprises four, said selected number of ternary pulses comprises three, and said shifting means require at least two of said selected combination signals.
Claim 8
Dependent Claim
50 words
The synchronizing system of claim 1 wherein said selected number of binary pulses comprises four, said selected number of ternary pulses comprises three, said shifting means shifts the grouping of said ternary pulses by one ternary pulse, and said shifting means require at least two of said selected combination signals.
Claim 9
Dependent Claim
57 words
The synchronizing system of claim 1 wherein said selected number of binary pulses comprises four, said selected number of ternary pulses comprises three, said shifting means shifts the grouping of said ternary pulses by one ternary pulse, said shifting means require at least two of said selected combination signals, and said selected combination comprises three ternary zeros.
Claim 10
Dependent Claim
61 words
The synchronizing system of claim 1 wherein said selected number of binary pulses comprises four, said selected number of ternary pulses comprises three, said scanning means and said shifting means have a pulse generator for operating said scanning means at selected intervals, and said shifting means blocks said pulse generator in response to said selected combination signal to cause said shifting.
Claim 11
Dependent Claim
65 words
The synchronizing system of claim 1 wherein said selected number of binary pulses comprises four, saId selected number of ternary pulses comprises three, said scanning means and said shifting means have a pulse generator for operating said scanning means at selected intervals, and said shifting means blocks said pulse generator for one ternary pulse in response to said selected combination signal to cause said shifting.
Claim 12
Dependent Claim
65 words
The synchronizing system of claim 1 wherein said selected number of binary pulses comprises four, said selected number of ternary pulses comprises three, said scanning means and said shifting means have a pulse generator for operating said scanning means at selected intervals, and said shifting means blocks said pulse generator in response to at least two of said selected combination signals to cause said shifting.
Claim 13
Dependent Claim
69 words
The synchronizing system of claim 1 wherein said selected number of binary pulses comprises four, said selected number of ternary pulses comprises three, said scanning means and said shifting means have a pulse generator for operating said scanning means at selected intervals, and said shifting means blocks said pulse generator for one ternary pulse in response to at least two of said selected combination signals to cause said shifting.
Claim 14
Dependent Claim
76 words
The synchronizing system of claim 1 wherein said selected number of binary pulses comprises four, said selected number of ternary pulses comprises three, said scanning means and said shifting means have a pulse generator for operating said scanning means at selected intervals, said shifting means blocks said pulse generator for one ternary pulse in response to at least two of said selected combination signals to cause said shifting, and said selected combination comprises three ternary zeros.
Claim 15
Dependent Claim
61 words
The synchronizing system of claim 1 wherein said shifting means require a plurality of said selected combination signals for shifting said grouping, and further comprising means for restoring said shifting means to an original condition in the absence of said plurality of said selected combination signals occurring within a selected time interval, so as to avoid shifting because of random conditions.
Claim 16
Dependent Claim
24 words
The synchronizing system of claim 14 wherein said selected number of binary pulses comprises four, and said selected number of ternary pulses comprises three.
Claim 17
Dependent Claim
21 words
The synchronizing system of claim 14 wherein said shifting means shifts the grouping of said ternary pulses by one ternary pulse.
Claim 18
Dependent Claim
38 words
The synchronizing system of claim 14 wherein said selected number of binary pulses comprises four, said selected number of ternary pulses comprises three, and said shifting means shifts the grouping of said ternary pulses by one ternary pulse.
References Cited (Backward Citations)
US3524938A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |