US3356794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for reducing noise in f. m. carrier recording
Assignee: Ampex Corp
•
Filing: 1964-05-19
•
Granted: 1967-12-05
•
Expires: 1984-05-19
Abstract
No abstract record available.
Inventors
- 👤 Michael O Felix
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:39
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/76; H04N5/91; H04N5/911
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
A CIRCUIT FOR REDUCING THE EFFECT OF NOISE DURING THE REPRODUCTION OF INFORMATION FROM A MAGNETICALLY RECORDED FREQUENCY MODULATED WIDE-BAND SIGNAL COMPRISING, MEANS PROVIDING A SEPARATE SIGNAL OF GIVEN FREQUENCY AND HAVING A FIRST AMPLITUDE SUBSTANTIALLY GREATER THAN THE LEVEL OF THE NOISE, MEANS PROVIDING A REPRODUCED FREQUENCY MODULATED WIDE-BAND SIGNAL HAVING A SECOND AMPLITUDE SUBSTANTIALLY GREATER THAN SAID FIRST AMPLITUDE, WHICH SIGNAL IS SUBJECT TO REDUCTION IN AMPLITUDE BELOW SAID FIRST AMPLITUDE, VARIABLE GAIN MEANS COUPLED TO BOTH SIGNAL PROVIDING MEANS FOR AMPLIFYING SAID SIGNALS, SAID VARIABLE GAIN MEANS BEING RESPONSIVE TO THE AMPLITUDE THE SIGNAL APPLIED THERETO SO THAT THE AMPLIFICATION OF SAID SEPARATE SIGNAL IS INCREASES WHEN SAID FREQUENCY MODULATED SIGNAL FALLS BELOW SAID FIRST AMPLITUDE, AND MEANS COUPLED TO THE OUTPUT OF SAID VARIABLE GAIN MEANS FOR PRODUCING INFORMATION REPRESENTED BY THE FREQUENCY OF THE SIGNAL APPLIED THERETO.
Claim 2
Dependent Claim
142 words
A CIRCUIT FOR REDUCING THE EFFECT OF NOISE DURING THE REPRODUCTION OF INFORMATION FROM A MAGNETICALLY RECORDED FREQUENCY MODULATED WIDE-BAND SIGNAL COMPRISING, MEANS PROVIDING A SEPARATE SIGNAL OF GIVEN FREQUENCY AND HAVING A FIRST AMPLITUDE SUBSTANTIALLY GREATER THAN THE LEVEL OF THE NOISE, MEANS PROVIDING A REPRODUCED FREQUENCY MODULATED WIDE-BAND SIGNAL HAVING A SECOND AMPLITUDE SUBSTANTIALLY GREATER THAN SAID FIRST AMPLITUDE, WHICH SIGNAL IS SUBJECT TO REDUCTION IN AMPLITUDE BELOW SAID FIRST AMPLITUDE, VARIABLE GAIN MEANS COUPLED TO BOTH SIGNAL PROVIDING MEANS FOR AMPLIFYING SAID SIGNALS, SAID VARIABLE GAIN MEANS BEING RESPONSIVE TO THE AMPLITUDE THE SIGNAL APPLIED THERETO SO THAT THE AMPLIFICATION OF SAID SEPARATE SIGNAL IS INCREASES WHEN SAID FREQUENCY MODULATED SIGNAL FALLS BELOW SAID FIRST AMPLITUDE, AND MEANS COUPLED TO THE OUTPUT OF SAID VARIABLE GAIN MEANS FOR PRODUCING INFORMATION REPRESENTED BY THE FREQUENCY OF THE SIGNAL APPLIED THERETO.
References Cited (Backward Citations)
US2816162A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-12-04 | 1971-06-05 | 1971-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-12-04 | 1975-06-05 | 1975-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-12-04 | 1979-06-05 | 1979-12-05 | $7700.00 | Window Closed / Lapsed |