US3812436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waveform equalizer system
Assignee: Fujitsu Ltd
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Filing: 1972-12-29
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Granted: 1974-05-21
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Expires: 1992-12-29
Abstract
Abstract A waveform equalizer system for pulse repeating transmission, including a transmission line and a repeater inserted therein. The repeater has such a gain characteristic that, with respect to a change in the transmission line length, a peak amplitude of a received signal is held constant and its waveform is changed within an allowable value restricted by intersymbol interference, thereby to provide an effective equalized waveform irrespective of the change in the transmission line length.
Inventors
- 👤 I Fudemoto
- 👤 S Kubota
- 👤 T Hayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:28
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04L25/03012; H04L25/03019
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
162 words
A waveform equalizer system for pulse repeating transmission, said waveform equalizer system comprising: a. a transmission line, and b. a repeater inserted within said transmission line, said repeater comprising: 1. a variable equalizer for providing an output, 2. a variable attenuator coupled to said equalizer and controlled by the output of a function generator means for maintaining a maximum amplitude of the received signal at a substantially constant value, 3. a rectifying circuit coupled in a feedback arrangement and responsive to the repeater output for providing a signal proportional to the transmission line length and for altering the pulse width of a received signal from said tranmission line within an allowable value restricted by waveform interference, the proportional signal being applied to said variable equalizer for the control thereof, and 4. said proportional signal also being applied to said function generator means for converting the proportional signal as derived from said rectifying circuit, by a function associated with the transmission line length.
Claim 2
Dependent Claim
162 words
A waveform equalizer system for pulse repeating transmission, said waveform equalizer system comprising: a. a transmission line, and b. a repeater inserted within said transmission line, said repeater comprising: 1. a variable equalizer for providing an output, 2. a variable attenuator coupled to said equalizer and controlled by the output of a function generator means for maintaining a maximum amplitude of the received signal at a substantially constant value, 3. a rectifying circuit coupled in a feedback arrangement and responsive to the repeater output for providing a signal proportional to the transmission line length and for altering the pulse width of a received signal from said tranmission line within an allowable value restricted by waveform interference, the proportional signal being applied to said variable equalizer for the control thereof, and 4. said proportional signal also being applied to said function generator means for converting the proportional signal as derived from said rectifying circuit, by a function associated with the transmission line length.
Claim 3
Dependent Claim
31 words
a variable attenuator coupled to said equalizer and controlled by the output of a function generator means for maintaining a maximum amplitude of the received signal at a substantially constant value,
Claim 4
Dependent Claim
31 words
a variable attenuator coupled to said equalizer and controlled by the output of a function generator means for maintaining a maximum amplitude of the received signal at a substantially constant value,
Claim 5
Dependent Claim
33 words
A waveform equalizer system according to claim 1, wherein said function generator means comprises a variable attenuator driven by the function which is proportional to the square root of the transmission line length.
Claim 6
Dependent Claim
32 words
A waveform equalizer system according to claim 2, wherein said variable attenuator comprises a circuit including a capacitor variable as a function proportional to the square root of the transmission line length.
Claim 7
Dependent Claim
60 words
a rectifying circuit coupled in a feedback arrangement and responsive to the repeater output for providing a signal proportional to the transmission line length and for altering the pulse width of a received signal from said tranmission line within an allowable value restricted by waveform interference, the proportional signal being applied to said variable equalizer for the control thereof, and
Claim 8
Dependent Claim
60 words
a rectifying circuit coupled in a feedback arrangement and responsive to the repeater output for providing a signal proportional to the transmission line length and for altering the pulse width of a received signal from said tranmission line within an allowable value restricted by waveform interference, the proportional signal being applied to said variable equalizer for the control thereof, and
Claim 9
Dependent Claim
31 words
A waveform equalizer system according to claim 1, wherein said function generator means comprises a variable attenuator driven by the function which has a linear relation to the transmission line length.
Claim 10
Dependent Claim
31 words
said proportional signal also being applied to said function generator means for converting the proportional signal as derived from said rectifying circuit, by a function associated with the transmission line length.
Claim 11
Dependent Claim
31 words
said proportional signal also being applied to said function generator means for converting the proportional signal as derived from said rectifying circuit, by a function associated with the transmission line length.
Claim 12
Dependent Claim
28 words
A waveform equalizer system according to claim 4, wherein said variable attenuator comprises a circuit including a capacitor variable as a function proportional to said transmission line length.
Claim 13
Dependent Claim
25 words
A waveform equalizer system according to claim 1, wherein said equalizer includes a circuit including a capacitor variable with respect to said transmission line length.
Claim 14
Dependent Claim
31 words
A waveform equalizer system according to claim 1, wherein said function generator means generates the function related to said transmission line lengtH for providing a driving signal to a variable attenuator.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |