US3976996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conversion of FSK to NRZ coding
Assignee: RCA Corp
•
Filing: 1975-06-04
•
Granted: 1976-08-24
•
Expires: 1995-06-04
Abstract
Abstract Circuit and method for converting FSK recorded data to NRZ by measuring time intervals between signals transitions of the same polarity.
Inventors
- 👤 Chin Tao Wu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:47
CPC Classifications
H; H04; H04L; H04L27/00; H04L27/10; H04L27/14; H04L27/156; H04L27/1563; G; G11; G11B; G11B20/00; G11B20/10; G11B20/14; G11B20/1403; G11B20/1407; G11B20/1415
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
69 words
A system for converting frequency shift keyed input signals to non-return-to-zero output signals comprising the combination of: timing means responsive to the input signals for producing a timing signal with a predetermined time duration; and output means responsive to the input signals and to said timing signal for producing an output signal concurrent with said timing signal when an input signal occurs during the duration of the timing signal.
Claim 2
Independent Claim
69 words
A system for converting frequency shift keyed input signals to non-return-to-zero output signals comprising the combination of: timing means responsive to the input signals for producing a timing signal with a predetermined time duration; and output means responsive to the input signals and to said timing signal for producing an output signal concurrent with said timing signal when an input signal occurs during the duration of the timing signal.
Claim 3
Dependent Claim
16 words
The invention as claimed in claim 1 wherein said timing means includes a retriggerable monostable multivibrator.
Claim 4
Dependent Claim
43 words
The invention as claimed in claim 2 wherein said output means includes a D-type flip-flop coupled to receive the input signals at a clock terminal, the timing signal at a data terminal, and a complement of the timing signal at a reset terminal.
Claim 5
Dependent Claim
19 words
The invention as claimed in claim 1 wherein said predetermined time duration is approximately 75% of a cell time.
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) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |