US3787613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse transmission system for conveying data and control words by means of alternating polarity pulses and violations thereof
Assignee: AT&T Inc
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Filing: 1972-06-27
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Granted: 1974-01-22
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Expires: 1992-06-27
Abstract
Abstract The data bits of data words are encoded into bipolar pulses, the polarity of each pulse differing from the polarity of the prior pulse. When the data bits of a control word are encoded, there is also generated a bipolar pulse violation, the pulse having the same polarity as the prior pulse. Additional bipolar pulses may be inserted to insure that an odd number of bipolar pulses separate pulse violations, successive violations thereby having opposite polarities. A remote decoder converts the bipolar pulses to data bits and the data bits of each control word are recovered from the decoder when the bipolar pulse violation is received.
Inventors
- 👤 W Farmer
- 👤 J Kneuer
- 👤 W Lawless
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:04
CPC Classifications
H; H04; H04L; H04L12/00; H04L25/00; H04L25/38; H04L25/40; H04L25/49; H04L25/4917; H04L25/4923; H04L25/4925
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
166 words
A system for transmitting words to a line comprising, a signal source for providing data words, each of the data words being defined by a permutation of a fixed number of binary signal bits, and for providing control words, each of the control words comprising the fixed number of binary signal bits and being defined by a permutation of certain ones of the fixed number of bits, and being further identified by an accompanying signal, encoding means for converting each bit having one of the binary signal conditions to a bipolar pulse having a polarity differing from the polarity of the immediately preceding pulse, control means responsive to the accompanying signal for converting another one of the fixed number of bits of the control word identified thereby to a bipolar violation pulse having the same polarity as the immediately preceding bipolar pulse, and means responsive to the encoding means and to the control means for applying the converted bipolar pulses and violation pulses to the line.
Claim 2
Independent Claim
166 words
A system for transmitting words to a line comprising, a signal source for providing data words, each of the data words being defined by a permutation of a fixed number of binary signal bits, and for providing control words, each of the control words comprising the fixed number of binary signal bits and being defined by a permutation of certain ones of the fixed number of bits, and being further identified by an accompanying signal, encoding means for converting each bit having one of the binary signal conditions to a bipolar pulse having a polarity differing from the polarity of the immediately preceding pulse, control means responsive to the accompanying signal for converting another one of the fixed number of bits of the control word identified thereby to a bipolar violation pulse having the same polarity as the immediately preceding bipolar pulse, and means responsive to the encoding means and to the control means for applying the converted bipolar pulses and violation pulses to the line.
Claim 3
Dependent Claim
79 words
A system, in accordance with claim 1, wherein the control means includes means enabled by the application of an even number of bipolar pulses to the line subsequent to the preceding violation pulse for converting an additional oNe of the fixed number of bits of the control word to a bipolar pulse and for applying said pulse to the line, whereby an odd number of bipolar pulses separate each violation pulse and succeeding violation pulses are of opposite polarity.
Claim 4
Dependent Claim
112 words
A system, in accordance with claim 1, wherein there is included bistable means operated in response to the conversion of each of the bits having the one condition for determining the polarity of the next successive pulse and wherein the control means further includes means for operating the bistable means in response to the accompanying signal when an odd number of bipolar pulses are applied to the line subsequent to the preceding violation pulse and means for precluding the operation of the bistable means in response to the conversion of the additional one of the bits of the control word when the even number of bipolar pulses are applied to the line.
Claim 5
Independent Claim
233 words
A system for transmitting words to a line comprising, a signal source for providing data words, each of the data words being defined by a permutation of a fixed number of binary signal bits, and for providing control words, each of the control words comprising the fixed number of binary signal bits and being defined by a permutation of certain ones of the fixed number of bits, and being further identified by an accompanying signal, means for registering the bits provided by the signal source, encoding means for converting each registered bit having one of the binary signal conditions to a bipolar pulse, the encoding means including bistable means for determining the polarity of the bipolar pulse in accordance with the state of the bistable means, means responsive to each of the registered bits having the one condition for operating the bistable means whereby successive bipolar pulses have opposite polarities, and control means responsive to the accompanying signal for precluding the registration of another one of the fixed number of bits of the control word identified thereby and for inserting in the registering means, in place of the other bit, a new bit having the one condition, the control means further including means responsive to the accompanying signal for operating the bistable means, whereby the new bit is converted to a bipolar pulse having the same polarity as the immediately preceding bipolar pulse.
Claim 6
Independent Claim
233 words
A system for transmitting words to a line comprising, a signal source for providing data words, each of the data words being defined by a permutation of a fixed number of binary signal bits, and for providing control words, each of the control words comprising the fixed number of binary signal bits and being defined by a permutation of certain ones of the fixed number of bits, and being further identified by an accompanying signal, means for registering the bits provided by the signal source, encoding means for converting each registered bit having one of the binary signal conditions to a bipolar pulse, the encoding means including bistable means for determining the polarity of the bipolar pulse in accordance with the state of the bistable means, means responsive to each of the registered bits having the one condition for operating the bistable means whereby successive bipolar pulses have opposite polarities, and control means responsive to the accompanying signal for precluding the registration of another one of the fixed number of bits of the control word identified thereby and for inserting in the registering means, in place of the other bit, a new bit having the one condition, the control means further including means responsive to the accompanying signal for operating the bistable means, whereby the new bit is converted to a bipolar pulse having the same polarity as the immediately preceding bipolar pulse.
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |