US4569047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal transmission system
Assignee: Canon Inc
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Filing: 1983-11-14
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Granted: 1986-02-04
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Expires: 2003-11-14
Abstract
Abstract A signal transmission system for interconnecting a plural number of input/output devices comprises a pair of signal lines for transmitting signals between the input/output devices and a reference signal generator connected to the signal lines for generating a reference signal for using the signal lines on a time-division basis in order for each of the input/output devices to perform signal transmission during an allotted time. A reference signal detector detects the reference signal transmitted from the reference signal generator by the signal lines. A signal line using time selector selects the using time of the signal lines allotted to each of the input/output devices on the basis of the reference signal as detected by the detector and a further selector is responsive to the using time selected by the using time selector for selecting a signal transmitted by the signal lines from each of the input/output devices to others of the input/output devices and a signal to be transmitted to each of the input/output devices from others of the input/output devices.
Inventors
- 👤 Harutsugu Aimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:40
CPC Classifications
G; G06; G06F; G06F13/00; G06F13/14; G06F13/36; G06F13/368; G06F13/372
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
239 words
A signal transmission system for interconnecting a plurality of input/output devices, comprising: signal line means for transmitting reference signals and input/output signals; reference signal generating means for generating a reference signal, having one frequency, to be applied to said signal line means; and a plurality of input/output devices connected to said signal line means, each one comprising: detecting means for detecting said reference signal transmitted through said signal line means; standard signal generating means for generating a standard signal having a second frequency higher than said one frequency; forming means responsive to detection of said reference signal by said detecting means by counting said standard signal, for forming an allowance signal to enable said one input/output device to communicate with another of said input/output devices during a respective using time allotted to said one input/output device; process means for processing an input/output signal obtained from said signal line means and an input/output signal to be transmitted through said signal line means; input signal selector means for receiving an input/output signal from said signal line means and said allowance signal from said forming means and for introducing an input/output signal corresponding in time to said allowance signal into said process means from said signal line means; and output signal selector means for receiving an input/output signal obtained from said process means and said allowance signal and for transmitting an input/output signal from said process means to said signal line means.
Claim 2
Dependent Claim
239 words
A signal transmission system for interconnecting a plurality of input/output devices, comprising: signal line means for transmitting reference signals and input/output signals; reference signal generating means for generating a reference signal, having one frequency, to be applied to said signal line means; and a plurality of input/output devices connected to said signal line means, each one comprising: detecting means for detecting said reference signal transmitted through said signal line means; standard signal generating means for generating a standard signal having a second frequency higher than said one frequency; forming means responsive to detection of said reference signal by said detecting means by counting said standard signal, for forming an allowance signal to enable said one input/output device to communicate with another of said input/output devices during a respective using time allotted to said one input/output device; process means for processing an input/output signal obtained from said signal line means and an input/output signal to be transmitted through said signal line means; input signal selector means for receiving an input/output signal from said signal line means and said allowance signal from said forming means and for introducing an input/output signal corresponding in time to said allowance signal into said process means from said signal line means; and output signal selector means for receiving an input/output signal obtained from said process means and said allowance signal and for transmitting an input/output signal from said process means to said signal line means.
Claim 3
Dependent Claim
22 words
A signal transmission system as set forth in claim 1, wherein said allowance signal forming means comprises a counter and a decoder.
Claim 4
Dependent Claim
18 words
A signal transmission system as set forth in claim 1, wherein said process means comprises an arithmetic unit.
Claim 5
Dependent Claim
182 words
A signal transmission system for interconnecting a plurality of input/output devices, comprising: signal line means for transmitting a signal having one standard level and signals having a first level and a second level each different from said standard level; reference signal generating means for applying a reference signal, having one frequency and having said first level out of said three levels to said signal line means; and a plurality of input/output devices connected to said signal line means, each one comprising: detecting means for detecting said reference signal transmitted through said signal line means; standard signal generating means for generating a standard signal having a second frequency higher than said one frequency; forming means responsive to detection of a reference signal by said detecting means by counting said standard signal, for forming an allowance signal to enable said one input/output device to communicate with another of said input/output devices during a respective using time allotted to said one input/output device; and signal transmitting means responsive to said allowance signal for transmitting a signal having said second level to said signal line means.
Claim 6
Dependent Claim
182 words
A signal transmission system for interconnecting a plurality of input/output devices, comprising: signal line means for transmitting a signal having one standard level and signals having a first level and a second level each different from said standard level; reference signal generating means for applying a reference signal, having one frequency and having said first level out of said three levels to said signal line means; and a plurality of input/output devices connected to said signal line means, each one comprising: detecting means for detecting said reference signal transmitted through said signal line means; standard signal generating means for generating a standard signal having a second frequency higher than said one frequency; forming means responsive to detection of a reference signal by said detecting means by counting said standard signal, for forming an allowance signal to enable said one input/output device to communicate with another of said input/output devices during a respective using time allotted to said one input/output device; and signal transmitting means responsive to said allowance signal for transmitting a signal having said second level to said signal line means.
Claim 7
Dependent Claim
21 words
A signal transmission system as set forth in claim 4, wherein said allowance signal forming means comprises a counter and decoder.
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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) | 1989-02-03 | 1989-08-05 | 1990-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-03 | 1993-08-05 | 1994-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-03 | 1997-08-05 | 1998-02-04 | $7700.00 | Window Closed / Lapsed |