US3794759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-terminal communication apparatus controller
Assignee: International Business Machines Corp
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Filing: 1972-12-26
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Granted: 1974-02-26
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Expires: 1992-12-26
Abstract
Abstract A multi-terminal communication apparatus controller is provided which allows information signals on a transmission medium to be replaced with new information signals at each terminal. Branch information signals are obtained from the main transmission medium by coupling without destroying or interrupting the propagation of the information signals on the transmission medium. These branch information signals are converted into terminal signals compatible with the terminal. New information signals are coupled from the terminal to a send branch line where they are converted into send information signals which are coupled onto the transmission medium. The branch information signals are phase inverted when the new information signals are provided. These phase inverted signals are applied to the transmission line so as to cancel the corresponding information signals on the transmission medium. The send information signals are coupled onto the transmission medium in the space left by the cancelled information signals.
Inventors
- 👤 H Nick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:57
CPC Classifications
H; H04; H04L; H04L12/00; H04L12/28; H04L12/42
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
153 words
A multi-terminal communication apparatus controller which allows information signals on a transmission medium to be replaced with new information signals at each terminal comprising: a first coupling means for obtaining branch information signals from the transmission medium without destroying or interrupting the propagation of the information signals on said transmission medium; means for converting said branch information signals into terminal signals compatible with the terminal; terminal coupling means for coupling new information signals from said terminal to a send branch line; means for converting said new information signals into send information signals; means for inverting the phase of said branch information signals under control of said new information signals; means for coupling said inverted phase signals onto said transmission medium so as to cancel the corresponding information signals on said transmission medium; and means for coupling said send information signals onto said transmission medium in the space left by the cancelled information signals.
Claim 2
Dependent Claim
153 words
A multi-terminal communication apparatus controller which allows information signals on a transmission medium to be replaced with new information signals at each terminal comprising: a first coupling means for obtaining branch information signals from the transmission medium without destroying or interrupting the propagation of the information signals on said transmission medium; means for converting said branch information signals into terminal signals compatible with the terminal; terminal coupling means for coupling new information signals from said terminal to a send branch line; means for converting said new information signals into send information signals; means for inverting the phase of said branch information signals under control of said new information signals; means for coupling said inverted phase signals onto said transmission medium so as to cancel the corresponding information signals on said transmission medium; and means for coupling said send information signals onto said transmission medium in the space left by the cancelled information signals.
Claim 3
Dependent Claim
16 words
A multi-terminal communication apparatus according to claim 1, wherein the transmission medium is a transmission line.
Claim 4
Dependent Claim
29 words
A multi-terminal communication apparatus controller according to claim 1, wherein said first coupling means is a directional coupler tuned to the frequency of information signals on said transmission medium.
Claim 5
Dependent Claim
62 words
A multi-terminal communication apparatus controller according to claim 1, wherein said means for converting said branch information signals into terminal signals comprises a driver for transforming said branch information signals into pulses having a fast rise time and a relatively slow fall time and a second directional coupler for coupling said pulses to said terminal in a positive and negative pulse form.
Claim 6
Dependent Claim
38 words
A multi-terminal communication apparatus controller according to claim 1, wherein said terminal coupling means is a terminal directional coupler for producing positive and negative pulses based on the rise and fall time of the new information signals, respectively.
Claim 7
Dependent Claim
72 words
A multi-terminal communication apparatus controller according to claim 5, wherein said means for converting said new information signals into said send information signals comprises a receiver latch, a driver-amplifier-clipper and an oscillator, said latch being turned on and off by said positive and negative pulses from said terminal directional coupler, said oscillator providing sinusoidal signals which pass through the open latch and are amplified and clipped to form the send information signals.
Claim 8
Dependent Claim
96 words
A multi-terminal communication apparatus controller according to claim 1, wherein said means for inverting the phase of said branch information signals includes a latch circuit turned on by the first pulse of said new information which is the synchronization pulse, a counter preset to a predetermined count determined by the frame length of the information, and an inverter amplifier which is gated by each count of said counter thereby allowing the corresponding information signal of said branch information signals to be amplified and phase inverted, the last gate output of said counter turning off said latch.
Claim 9
Dependent Claim
45 words
A multi-terminal communication apparatus controller according to claim 1, wherein said means for coupling said inverted phase signals onto said transmission medium is a directional coupler tuned to said transmission medium information frequency so as to cancel the corresponding information signals on said transmission medium.
Claim 10
Dependent Claim
34 words
A multi-terminal communication apparatus controller according to claim 1, wherein said means for coupling said send information signals onto said transmission medium is a directional coupler tuned to said transmission medium information signal frequency.
Claim 11
Dependent Claim
47 words
A multi-terminal communication apparatus controller according to claim 1, wherein an adjustable line delay is introduced for said branch information signals so that the phase of the branch information signals can be adjusted before said means for inverting the phase of said branch information signals is applied.
Claim 12
Dependent Claim
51 words
A multi-terminal communication apparatus controller according to claim 1, wherein a delay is introduced into the transmission medium for providing the necessary delay of the information signals on the main transmission medium so that the Information signals arrive at said coupling means at the same time as said inverted phase signals.
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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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |