US3601544A
Expired / Lapsed
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Baseband frequency multiplexing scheme
Assignee: Unisys Corp
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Filing: 1969-04-16
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Granted: 1971-08-24
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Expires: 1989-04-16
Abstract
Abstract A binary data multiplexing system is disclosed wherein data from a binary source is applied to two encoders. One encoder operates to impart a self-clocking coding to the data and to thus cause the data to lie in a frequency band near the upper limits of the baseband frequency spectrum of the system. The second encoder operates to impart a low frequency coding to the data and to thus cause the data to lie in a frequency band near the lower limits of the baseband frequency spectrum of the system. In this way the data transmitted by the two encoders is made to lie in different and separated frequency bands.
Inventors
- 👤 John V Murphy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:53
CPC Classifications
H; H04; H04L; H04L5/00; H04L5/02; H04L5/06; H04L25/00; H04L25/38; H04L25/40; H04L25/49
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
109 words
In a data multiplexing system, the combination comprising, a binary data source means having a given bit rate, a first binary data encoder means coupled to said source operable to encode the output from said source so as to produce a nonclocked encoded binary signal whose baseband frequencies lie in a first band, a second binary encoder coupled to said source operable to encode the output from said source so as to produce a self-clocked encoded binary signal whose baseband frequencies lie in a second band separated from said first band, and means for simultaneously applying the outputs from said first and second encoders to a common output channel.
Claim 2
Dependent Claim
109 words
In a data multiplexing system, the combination comprising, a binary data source means having a given bit rate, a first binary data encoder means coupled to said source operable to encode the output from said source so as to produce a nonclocked encoded binary signal whose baseband frequencies lie in a first band, a second binary encoder coupled to said source operable to encode the output from said source so as to produce a self-clocked encoded binary signal whose baseband frequencies lie in a second band separated from said first band, and means for simultaneously applying the outputs from said first and second encoders to a common output channel.
Claim 3
Dependent Claim
39 words
The combination set forth in claim 1 wherein the said data source means comprises first and second data sources having synchronous bit rates and said first and second encoders are coupled respectively to said first and second data sources.
Claim 4
Dependent Claim
34 words
The combination set forth in claim 2 wherein said first encoder includes means operable to provide a three level coding and said second encoder includes means operable to provide a two level self-clocking code.
Claim 5
Dependent Claim
31 words
The combination of claim 1 wherein the first data encoder operates to provide a three level output signal and the second data encoder operates to provide a phase modulated output signal.
Claim 6
Dependent Claim
61 words
The combination of claim 4 wherein there is further included means for reproducing the output signals from said encoders which comprises a first filtering means for passing the output signals from said first encoder and a second filtering means for passing the signal from said second encoder, and first and second decoders coupled to the output of the respective filtering means.
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) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |