Patent US3553367A successfully refreshed from Google Patents.
US3553367A
Expired / Lapsed
US
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Facsimile multiplex communication system
Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1968-05-10
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Granted: 1971-01-05
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Expires: 1988-05-10
Abstract
Abstract A system for multiplexing facsimile transmission on an audio frequency carrier. The signals from a first transmitter are converted to serial digital data and used to synchronously amplitude modulate the carrier. The signals from a second transmitter are converted to serial digital data and used to synchronously phase modulate the amplitude modulated carrier. A first facsimile recorder responds to the amplitude modulated carrier. The phase modulation component is converted into an amplitude modulated signal to drive a second facsimile recorder.
Inventors
- 👤 Bert F Krauss
- 👤 Bernard M Rosenheck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:01
CPC Classifications
H; H04; H04J; H04J9/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
120 words
A multiplex system utilizing an alternating carrier, comprising: two transmitters; two receivers controlled by said carrier; means for converting the intelligence signals from both of said transmitters into digital code signals synchronized in frequency and phase with the waves of said carrier; means including said converting means for synchronously amplitude modulating said carrier in accordance with the intelligence signals from one of said transmitters; means including said converting means for synchronously phase modulating said carrier in accordance with the intelligence signals from the other of said transmitters, and a transmission circuit for the carrier which connects the transmitters and receivers, whereby each receiver is responsive to the modulation of said carrier representing the intelligence signals generated by its corresponding transmitter.
Claim 2
Dependent Claim
120 words
A multiplex system utilizing an alternating carrier, comprising: two transmitters; two receivers controlled by said carrier; means for converting the intelligence signals from both of said transmitters into digital code signals synchronized in frequency and phase with the waves of said carrier; means including said converting means for synchronously amplitude modulating said carrier in accordance with the intelligence signals from one of said transmitters; means including said converting means for synchronously phase modulating said carrier in accordance with the intelligence signals from the other of said transmitters, and a transmission circuit for the carrier which connects the transmitters and receivers, whereby each receiver is responsive to the modulation of said carrier representing the intelligence signals generated by its corresponding transmitter.
Claim 3
Dependent Claim
24 words
A multiplex system according to claim 1, in which one receiver responding to amplitude modulated input signals is connected directly to the transmission circuit.
Claim 4
Dependent Claim
29 words
A multiplex system According to claim 2, in which the second receiver is connected to said transmission circuit through demultiplexing means for converting phase modulated to amplitude modulated signals.
Claim 5
Dependent Claim
20 words
A multiplex system according to claim 1, in which said receivers are facsimile recorders of the amplitude modulated signal type.
Claim 6
Dependent Claim
26 words
A multiplex system according to claim 1, in which the code signal converting means includes a flip-flop cyclically operated in synchronism with the carrier wave reversals.
Claim 7
Dependent Claim
112 words
A multiplex facsimile system comprising: means for generating an alternating carrier; a transmitting channel for said carrier; a plurality of facsimile transmitters; a plurality of facsimile recorders, one for each of said transmitters; means for converting the intelligence signals generated by each of said transmitters into synchronous digital code signals of the same frequency and phase as the waves of said alternating carrier; means connected to said code converting means for modulating said carrier in a different manner for the intelligence signals from each of the respective transmitters; and means responsive to the modulated carrier for driving each of said recorders in accordance with the operation of different ones of said transmitters.
Claim 8
Dependent Claim
112 words
A multiplex facsimile system comprising: means for generating an alternating carrier; a transmitting channel for said carrier; a plurality of facsimile transmitters; a plurality of facsimile recorders, one for each of said transmitters; means for converting the intelligence signals generated by each of said transmitters into synchronous digital code signals of the same frequency and phase as the waves of said alternating carrier; means connected to said code converting means for modulating said carrier in a different manner for the intelligence signals from each of the respective transmitters; and means responsive to the modulated carrier for driving each of said recorders in accordance with the operation of different ones of said transmitters.
References Cited (Backward Citations)
US3160812A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |