US3340367A
Expired / Lapsed
US
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Playback equalization scheme for a reproduced frequency modulated signal
Assignee: Ampex Corp
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Filing: 1963-07-24
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Granted: 1967-09-05
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Expires: 1983-07-24
Abstract
No abstract record available.
Inventors
- 👤 Jr Charles H Coleman
- 👤 Michael O Felix
- 👤 Peter W Jensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:27
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/93; H03; H03C; H03C3/00; H03C3/005; H04N5/78; H04N5/7805; H04N5/931; H04N5/9315
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
AN EQUALIZATION CIRCUIT FOR A TRANSDUCER HEAD EMPLOYED FOR REPRODUCING A RECORDED FREQUENCY MODULATED SIGNAL, WHICH SIGNAL HAD BEEN PRODUCED BY FREQUENCY MODULATNG A CARRIER FREQUENCY WITH A BROAD BAND SIGNAL USING A LOW DEVIATION RATIO, PHASE AND AMPLITUDE DISTORTION CAUSED BY RESONANCE OF SAID HEAD BEING COMPENSATED, SAID CIRCUIT COMPRISING MEANS COUPLED TO SAID HEAD FOR PROVIDING A HIGH FREQUENCY AMPLITUDE BOOST TO THE REPRODUCED SIGNAL WITH A LINEAR PHASE CHARACTERISTIC, AND A PHASE CORRECTED LOW PASS FILTER MEANS COUPLED TO THE OUTPUT OF SAID MEANS, THE COMBINED RESPONSE OF SAID HIGH
Claim 2
Dependent Claim
93 words
AN EQUALIZATION CIRCUIT FOR A TRANSDUCER HEAD EMPLOYED FOR REPRODUCING A RECORDED FREQUENCY MODULATED SIGNAL, WHICH SIGNAL HAD BEEN PRODUCED BY FREQUENCY MODULATNG A CARRIER FREQUENCY WITH A BROAD BAND SIGNAL USING A LOW DEVIATION RATIO, PHASE AND AMPLITUDE DISTORTION CAUSED BY RESONANCE OF SAID HEAD BEING COMPENSATED, SAID CIRCUIT COMPRISING MEANS COUPLED TO SAID HEAD FOR PROVIDING A HIGH FREQUENCY AMPLITUDE BOOST TO THE REPRODUCED SIGNAL WITH A LINEAR PHASE CHARACTERISTIC, AND A PHASE CORRECTED LOW PASS FILTER MEANS COUPLED TO THE OUTPUT OF SAID MEANS, THE COMBINED RESPONSE OF SAID HIGH
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) | 1970-09-04 | 1971-03-06 | 1971-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-04 | 1975-03-06 | 1975-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-04 | 1979-03-06 | 1979-09-05 | $7700.00 | Window Closed / Lapsed |