US4644537A
Expired / Lapsed
US
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Inband coding of secondary data
Assignee: AT&T Inc
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Filing: 1984-12-24
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Granted: 1987-02-17
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Expires: 2004-12-24
Abstract
Abstract In a system for communicating primary and secondary data from a transmitter to a receiver, each of a first plurality of primary data word values is communicated by transmitting an individual channel symbol associated with that value, while at least one other primary data word value is communicated by transmitting a selected one of at least two other channel symbols associated with that one other value. The selected symbol is a function of the value of an individual secondary data word. In the receiver, both the primary and secondary data word values are recovered from the channel symbols thus transmitted.
Inventors
- 👤 Richard D. Gitlin
- 👤 Jean-Jacques Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:07
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/32; H04L27/34; H04L27/345; H04L27/3461; H04L27/3472
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
124 words
Apparatus comprising means for receiving a first stream of data words, means for receiving a second stream of data words, and means operative when an individual one of said first stream words has one of a predetermined plurality of values for applying to a communication channel an individual one of a predetermined plurality of channel symbols, said one channel symbol being uniquely associated with that one value, and operative when said individual one of said first stream words has at least one other value for applying to said channel a selected one of at least two other channel symbols associated with that one other value, said selected channel symbol being a function of the value of an individual one of said second stream words.
Claim 2
Dependent Claim
124 words
Apparatus comprising means for receiving a first stream of data words, means for receiving a second stream of data words, and means operative when an individual one of said first stream words has one of a predetermined plurality of values for applying to a communication channel an individual one of a predetermined plurality of channel symbols, said one channel symbol being uniquely associated with that one value, and operative when said individual one of said first stream words has at least one other value for applying to said channel a selected one of at least two other channel symbols associated with that one other value, said selected channel symbol being a function of the value of an individual one of said second stream words.
Claim 3
Dependent Claim
33 words
The invention of claim 1 wherein each one of said channel symbols comprises a carrier signal having a carrier state that is fixed for the duration of the transmission of that channel symbol.
Claim 4
Dependent Claim
34 words
The invention of claim 1 wherein each of said channel symbols is represented by a point in the complex plane and wherein each of said two other channel symbols has one coordinate in common.
Claim 5
Dependent Claim
27 words
The invention of claim 1 wherein each of said first stream words is a multibit word and each of said second stream words is a single-bit word.
Claim 6
Dependent Claim
163 words
Apparatus comprising means for receiving a first stream of data words, means for receiving a second stream of data words, and coding means operative when an individual one of said first stream words has one of a predetermined plurality of values for applying to a communication channel an individual one of a predetermined plurality of channel symbols uniquely representing that one value, and operative when said individual one of said first stream words has at least one other value and an individual one of said second stream words has a first predetermined value for applying to said channel a first channel symbol jointly representing said first other value and said first predetermined value, and operative when said individual one of said first stream words has said one other value and said individual one of said second stream words has a second predetermined value for applying to said channel a second channel symbol jointly representing said one other value and said second predetermined value.
Claim 7
Dependent Claim
163 words
Apparatus comprising means for receiving a first stream of data words, means for receiving a second stream of data words, and coding means operative when an individual one of said first stream words has one of a predetermined plurality of values for applying to a communication channel an individual one of a predetermined plurality of channel symbols uniquely representing that one value, and operative when said individual one of said first stream words has at least one other value and an individual one of said second stream words has a first predetermined value for applying to said channel a first channel symbol jointly representing said first other value and said first predetermined value, and operative when said individual one of said first stream words has said one other value and said individual one of said second stream words has a second predetermined value for applying to said channel a second channel symbol jointly representing said one other value and said second predetermined value.
Claim 8
Dependent Claim
33 words
The invention of claim 5 wherein each one of said channel symbols comprises a carrier signal having a carrier state that is fixed for the duration of the transmission of that channel symbol.
Claim 9
Dependent Claim
34 words
The invention of claim 6 wherein each of said channel symbols is represented by a point in the complex plane and wherein each of said two other channel symbols has one coordinate in common.
Claim 10
Dependent Claim
27 words
The invention of claim 6 wherein each of said first stream words is a multibit word and each of said second stream words is a single-bit word.
Claim 11
Dependent Claim
272 words
Apparatus for use in a data communication system which comprises means for receiving a first stream of data words; means for receiving a second stream of data words; and coding means operative when an individual one of said first stream words has one of a predetermined plurality of values for transmitting over a communication channel an individual one of a predetermined plurality of channel symbols uniquely representing that one value, and operative when said individual one of said first stream words has at least one other value and an individual one of said second stream words has a first predetermined value for transmitting over said channel a first other channel symbol jointly representing said first other value and said first predetermined value, and operative when said individual one of said first stream words has said one other value and said individual one of said second stream words has a second predetermined value for transmitting over said channel a second other channel symbol jointly representing said one other value and said second predetermined value; said apparatus comprising means for receiving each of said transmitted channel symbols from said channel, means for applying to a first output the primary stream data word value associated with each received channel symbol, and means operative when an individual one of said received channel symbols is at least said first other channel symbol for applying a signal representing said first predetermined value to a second output, and operative when an individual one of said received channel symbols is at least said second other channel symbol for applying a signal representing said second predetermined value to said second output.
Claim 12
Dependent Claim
272 words
Apparatus for use in a data communication system which comprises means for receiving a first stream of data words; means for receiving a second stream of data words; and coding means operative when an individual one of said first stream words has one of a predetermined plurality of values for transmitting over a communication channel an individual one of a predetermined plurality of channel symbols uniquely representing that one value, and operative when said individual one of said first stream words has at least one other value and an individual one of said second stream words has a first predetermined value for transmitting over said channel a first other channel symbol jointly representing said first other value and said first predetermined value, and operative when said individual one of said first stream words has said one other value and said individual one of said second stream words has a second predetermined value for transmitting over said channel a second other channel symbol jointly representing said one other value and said second predetermined value; said apparatus comprising means for receiving each of said transmitted channel symbols from said channel, means for applying to a first output the primary stream data word value associated with each received channel symbol, and means operative when an individual one of said received channel symbols is at least said first other channel symbol for applying a signal representing said first predetermined value to a second output, and operative when an individual one of said received channel symbols is at least said second other channel symbol for applying a signal representing said second predetermined value to said second output.
Claim 13
Dependent Claim
33 words
The invention of claim 9 wherein each one of said channel symbols comprises a carrier signal having a carrier state that is fixed for the duration of the transmission of that channel symbol.
Claim 14
Dependent Claim
34 words
The invention of claim 9 wherein each of said channel symbols is represented by a point in the complex plane and wherein each of said two other channel symbols has one coordinate in common.
Claim 15
Dependent Claim
27 words
The invention of claim 9 wherein each of said first stream words is a multibit word and each of said second stream words is a single-bit word.
Claim 16
Independent Claim
118 words
A method comprising the steps of receiving a first stream of data words, receiving a second stream of data words, applying to a communication channel when an individual one of said first stream words has one of a predetermined plurality of values an individual one of a predetermined plurality of channel symbols, said one channel symbol being uniquely associated with that one value, and applying to said channel when an individual one of said first stream words has at least one other value a selected one of at least two other channel symbols associated with that one other value, said selected channel symbol being a function of the value of an individual one of said second stream words.
Claim 17
Independent Claim
118 words
A method comprising the steps of receiving a first stream of data words, receiving a second stream of data words, applying to a communication channel when an individual one of said first stream words has one of a predetermined plurality of values an individual one of a predetermined plurality of channel symbols, said one channel symbol being uniquely associated with that one value, and applying to said channel when an individual one of said first stream words has at least one other value a selected one of at least two other channel symbols associated with that one other value, said selected channel symbol being a function of the value of an individual one of said second stream words.
Claim 18
Dependent Claim
33 words
The invention of claim 13 wherein each one of said channel symbols comprises a carrier signal having a carrier state that is fixed for the duration of the transmission of that channel symbol.
Claim 19
Dependent Claim
34 words
The invention of claim 14 wherein each of said channel symbols is represented by a point in the complex plane and wherein each of said two other channel symbols has one coordinate in common.
Claim 20
Dependent Claim
27 words
The invention of claim 14 wherein each of said first stream words is a multibit word and each of said second stream words is a single-bit word.
Claim 21
Independent Claim
156 words
A method comprising the steps of receiving a first stream of data words, receiving a second stream of data words, and applying to a communication channel when an individual one of said first stream words has one of a predetermined plurality of values an individual one of a predetermined plurality of channel symbols uniquely representing that one value, applying to said communication channel when said individual one of said first stream words has at least one other value and an individual one of said second stream words has a first predetermined value a first channel symbol jointly representing said first other value and said first predetermined value, and applying to said communication channel when said individual one of said first stream words has said one other value and said individual one of said second stream words has a second predetermined value a second channel symbol jointly representing said one other value and said second predetermined value.
Claim 22
Independent Claim
156 words
A method comprising the steps of receiving a first stream of data words, receiving a second stream of data words, and applying to a communication channel when an individual one of said first stream words has one of a predetermined plurality of values an individual one of a predetermined plurality of channel symbols uniquely representing that one value, applying to said communication channel when said individual one of said first stream words has at least one other value and an individual one of said second stream words has a first predetermined value a first channel symbol jointly representing said first other value and said first predetermined value, and applying to said communication channel when said individual one of said first stream words has said one other value and said individual one of said second stream words has a second predetermined value a second channel symbol jointly representing said one other value and said second predetermined value.
Claim 23
Dependent Claim
33 words
The invention of claim 17 wherein each one of said channel symbols comprises a carrier signal having a carrier state that is fixed for the duration of the transmission of that channel symbol.
Claim 24
Dependent Claim
34 words
The invention of claim 17 wherein each of said channel symbols is represented by a point in the complex plane and wherein each of said two other channel symbols has one coordinate in common.
Claim 25
Dependent Claim
27 words
The invention of claim 17 wherein each of said first stream words is a multibit word and each of said second stream words is a single-bit word.
Claim 26
Independent Claim
263 words
A method for use in a data communication system which comprises means for receiving a first stream of data words; means for receiving a second stream of data words; and coding means operative when an individual one of said first stream words has one of a predetermined plurality of values for transmitting over a communication channel an individual one of a predetermined plurality of channel symbols uniquely representing that one value, and operative when said individual one of said first stream words has at least one other value and an individual one of said second stream words has a first predetermined value for transmitting over said other channel a first channel symbol jointly representing said first other value and said first predetermined value, and operative when said individual one of said first stream words has said one other value and said individual one of said second stream words has a second predetermined value for transmitting over said channel a second other channel symbol jointly representing said one other value and said second predetermined value; said method comprising the steps of receiving each of said transmitted channel symbols, applying to a first output the primary stream data word value associated with each received channel symbol, applying a signal representing said first predetermined value to a second output when an individual one of said received channel symbols is at least said first other channel symbol, and applying a signal representing said second predetermined value to said second output when an individual one of said received channel symbols is at least said second other channel symbol.
Claim 27
Independent Claim
263 words
A method for use in a data communication system which comprises means for receiving a first stream of data words; means for receiving a second stream of data words; and coding means operative when an individual one of said first stream words has one of a predetermined plurality of values for transmitting over a communication channel an individual one of a predetermined plurality of channel symbols uniquely representing that one value, and operative when said individual one of said first stream words has at least one other value and an individual one of said second stream words has a first predetermined value for transmitting over said other channel a first channel symbol jointly representing said first other value and said first predetermined value, and operative when said individual one of said first stream words has said one other value and said individual one of said second stream words has a second predetermined value for transmitting over said channel a second other channel symbol jointly representing said one other value and said second predetermined value; said method comprising the steps of receiving each of said transmitted channel symbols, applying to a first output the primary stream data word value associated with each received channel symbol, applying a signal representing said first predetermined value to a second output when an individual one of said received channel symbols is at least said first other channel symbol, and applying a signal representing said second predetermined value to said second output when an individual one of said received channel symbols is at least said second other channel symbol.
Claim 28
Dependent Claim
33 words
The invention of claim 21 wherein each one of said channel symbols comprises a carrier signal having a carrier state that is fixed for the duration of the transmission of that channel symbol.
Claim 29
Dependent Claim
34 words
The invention of claim 22 wherein each of said channel symbols is represented by a point in the complex plane and wherein each of said two other channel symbols has one coordinate in common.
Claim 30
Dependent Claim
27 words
The invention of claim 22 wherein each of said first stream words is a multibit word and each of said second stream words is a single-bit word.
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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) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |