US3701028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction of harmonic distortion
Assignee: AT&T Inc
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Filing: 1971-07-13
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Granted: 1972-10-24
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Expires: 1991-07-13
Abstract
Abstract Harmonic distortion generated in signal processors is reduced by pre-emphasizing the processor input signal and de-emphasizing the processor output signal.
Inventors
- 👤 John Anthony Markevich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:16
CPC Classifications
H; H03; H03G; H03G11/00; H03G11/02; H03G7/00; H03G7/06; H03G7/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
27 words
A method of reducing harmonics generated in a center clipper including the steps of, pre-emphasizing the center clipper input signal and de-emphasizing the center clipper output signal.
Claim 2
Independent Claim
27 words
A method of reducing harmonics generated in a center clipper including the steps of, pre-emphasizing the center clipper input signal and de-emphasizing the center clipper output signal.
Claim 3
Dependent Claim
17 words
A method in accordance with claim 1 wherein the rates of pre-emphasizing and de-emphasizing are substantially equal.
Claim 4
Dependent Claim
30 words
A low distortion signal processing arrangement including, a center clipper, means for pre-emphasizing input signals for said center clipper and means for de-emphasizing the output signals of said center clipper.
Claim 5
Dependent Claim
30 words
A low distortion signal processing arrangement including, a center clipper, means for pre-emphasizing input signals for said center clipper and means for de-emphasizing the output signals of said center clipper.
Claim 6
Dependent Claim
24 words
An arrangement in accordance with claim 3 wherein said pre-emphasis means and said de-emphasis means have frequency response curve slopes of substantially equal magnitude.
References Cited (Backward Citations)
US3109991A
Cited
US2956153A
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US3014127A
Cited
US3059109A
Cited
US3015728A
Cited
US3444469A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |