US3778722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Receiver for data signals, including an automatic line correction circuit
Assignee: Telecommunications Radioelectriques et Telephoniques SA TRT
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Filing: 1972-05-11
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Granted: 1973-12-11
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Expires: 1992-05-11
Abstract
Abstract A receiver in a system for baseband data transmission includes a correction circuit for correcting the distortions caused by a transmission line. The correction circuit is provided with a number of correction cells constituted by active highpass filters. An automatic adaptation of the correction circuit to the slope of the line is obtained with the aid of a circuit element having a non-linear current-voltage characteristic without using a separate control circuit.
Inventors
- 👤 M Stein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:49
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/04; H03H11/12; H03H11/126; H04; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04L25/03012; H04L25/03019; H04L25/38; H04L25/40; H04L25/49; H04L25/4904
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
145 words
A receiver for data signals transmitted in the baseband through a transmission line with the aid of a code which does not comprise any direct current component, the receiver comprising: a plurality of correction cells for compensating for data signal distortions caused by the transmission line; each correction cell comprising an operational amplifier, and a feedback network; each feedback network comprising a reactive element, and a resistive means having a non-linear current-voltage characteristic connected thereto for providing in combination with the reactive element a substantially resistive impedance in the feedback network in response to received data signals in a first voltage range and for providing in combination with the reactive element a substantially reactive impedance in the feedback network in response to received data signals in a second voltage range, the second voltage range being a higher range than that of the first voltage range.
Claim 2
Dependent Claim
145 words
A receiver for data signals transmitted in the baseband through a transmission line with the aid of a code which does not comprise any direct current component, the receiver comprising: a plurality of correction cells for compensating for data signal distortions caused by the transmission line; each correction cell comprising an operational amplifier, and a feedback network; each feedback network comprising a reactive element, and a resistive means having a non-linear current-voltage characteristic connected thereto for providing in combination with the reactive element a substantially resistive impedance in the feedback network in response to received data signals in a first voltage range and for providing in combination with the reactive element a substantially reactive impedance in the feedback network in response to received data signals in a second voltage range, the second voltage range being a higher range than that of the first voltage range.
Claim 3
Dependent Claim
37 words
A receiver as claimed in claim 1, wherein the feedback network comprises a capacitor as a reactive element, and wherein the non-linear circuit element comprises a pair of anti-parallel arranged diodes connected in parallel with the capacitor.
Claim 4
Dependent Claim
34 words
A receiver as claimed in claim 1, further comprising an amplifier preceding the correction cells and having an adjustable amplification factor for adjusting the value of the data signal applied to the correction cells.
Claim 5
Dependent Claim
36 words
A receiver as claimed in claim 1, wherein each correction cell further comprises a variable resistor in the feedback circuit for adjusting the slope of the attenuation-frequency characteristic of said correction cell to a prescribed value.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |