Patent US3867580A successfully refreshed from Google Patents.
US3867580A
Expired / Lapsed
US
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Receiving circuits for digital signal distribution systems
Assignee: Telex Computer Products Inc
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Filing: 1972-12-29
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Granted: 1975-02-18
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Expires: 1992-12-29
Abstract
Abstract A plurality of receiving circuits are connected for receiving digital signals from a cable, each receiving circuit including an optoelectronic coupler for transmitting the digital signals from the cable to a using circuit. The threshold circuit can be used with the optoelectronic coupler for providing a signal squaring function if desired.
Inventors
- 👤 Stanley L Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:47
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/80; H04B10/801; H04B10/802; H03; H03K; H03K19/00; H03K19/02; H03K19/14
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
197 words
In a signal distribution system for transmitting digital signals, having first and second states, from a signal source to a plurality of receiving circuits over a common cable, each said receiving circuit comprising: a semiconductor device including an input circuit having a light emitting diode that generates radiation, the intensity of which is a function of current flow therethrough, and an output circuit having a phototransistor, the impedance of which is a function of the intensity of radiation received from said light emitting diode, said input and output circuits being substantially electrically isolated from each other; circuit means for connecting said input circuit to said cable so that in response to the application of a digital signal having the first state to said cable said source becomes energized, and in response to a digital signal having the second state said source is deenergized; circuit means connected to said output circuit so that said output circuit generates output signals in response to the digital signals on said cable, and threshold and wave squaring circuit means connected to said output circuit for producing digital output signals when said output signals generated by said output circuit exceed a preset level.
Claim 2
Dependent Claim
197 words
In a signal distribution system for transmitting digital signals, having first and second states, from a signal source to a plurality of receiving circuits over a common cable, each said receiving circuit comprising: a semiconductor device including an input circuit having a light emitting diode that generates radiation, the intensity of which is a function of current flow therethrough, and an output circuit having a phototransistor, the impedance of which is a function of the intensity of radiation received from said light emitting diode, said input and output circuits being substantially electrically isolated from each other; circuit means for connecting said input circuit to said cable so that in response to the application of a digital signal having the first state to said cable said source becomes energized, and in response to a digital signal having the second state said source is deenergized; circuit means connected to said output circuit so that said output circuit generates output signals in response to the digital signals on said cable, and threshold and wave squaring circuit means connected to said output circuit for producing digital output signals when said output signals generated by said output circuit exceed a preset level.
Claim 3
Dependent Claim
80 words
A receiving circuit as defined in claim 1 wherein: said cable includes a pair of leads, one of said leads defining a ground wire between said signal source and said receiving circuits; said circuit means for connecting said input circuit connects said input circuit between a power supply terminal and one of said cable leads, and said circuit means connecting said output circuit connects said output circuit between said power supply terminal and the other one of said cable leads.
Claim 4
Dependent Claim
111 words
A receiving circuit as defined in claim 1 wherein: said cable includes a pair of leads, one of said leads defining a ground wire between said signal source and said receiving circuits; said semiconductor device is an optoelectronic coupler including a light emitting diode in the input circuit and a photosensitive transistor in the output circuit; said circuit means for connecting said input circuit connects said diode in a direct current series circuit with resistive means, between a power supply terminal and one of said cable leads, and said circuit means connecting said output circuit connects said transistor between said power supply terminal and the other one of said cable leads.
Claim 5
Dependent Claim
38 words
A receiving circuit as defined in claim 3 wherein: said circuit means for connecting said input circuit includes a diode connected in said series circuit and poled for conduction in the same direction as said light emitting diode.
Claim 6
Dependent Claim
23 words
A signal distribution system as defined in claim 1 wherein said semiconductor device has a minimum response time of at least two microseconds.
Claim 7
Dependent Claim
139 words
A signal distribution system comprising: a cable pair; a source of digital signals connected to apply digital signals to said cable pair; a plurality of receiving circuit means, each including an optoelectronic coupler circuit having a light emitting diode and a photosensitive transistor located proximately to said diode and being optically coupled thereto, connected to said cable pair; wherein the diodes are connected in a direct current circuit between one lead of said cable pair and power supply terminals of corresponding receiving circuits and the transistors are connected between said power supply terminals and the other lead of said cable pair said other lead defining a ground wire between the signal source and the plurality of receiving circuits; the arrangement being such that said transistors repeat the digital signals received from said cable pair when applied to said diodes.
Claim 8
Dependent Claim
139 words
A signal distribution system comprising: a cable pair; a source of digital signals connected to apply digital signals to said cable pair; a plurality of receiving circuit means, each including an optoelectronic coupler circuit having a light emitting diode and a photosensitive transistor located proximately to said diode and being optically coupled thereto, connected to said cable pair; wherein the diodes are connected in a direct current circuit between one lead of said cable pair and power supply terminals of corresponding receiving circuits and the transistors are connected between said power supply terminals and the other lead of said cable pair said other lead defining a ground wire between the signal source and the plurality of receiving circuits; the arrangement being such that said transistors repeat the digital signals received from said cable pair when applied to said diodes.
Claim 9
Dependent Claim
47 words
A signal distribution system as defined in claim 6 including: threshold and wave squaring circuit means for each receiving circuit connected to said transistors for repeating the digital signals from said transistors when the signal exceeds a preset level and for squaring the edges of said 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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |