Resynchronizable recording system
Abstract
Abstract A DIGITAL MAGNETIC RECORDER COMBINES A DATA SIGNAL AND A CONTROL OR RESYNC COMPONENT SIGNAL HAVING A FREQUENCY EXACTLY A SUBMULTIPLE OF THE DATA BIT RATE. OPTIONALLY, ADDITIONAL CONTROL SIGNALS AT FREQUENCIES ABOVE OR BELOW THE DATA BANDWIDTH, BUT WITHIN THE AVAILABLE RECORDER BANDWIDTH, MAY BE RECORDED. FOR ENABLING RESYNCHRONIZATION IN A MULTI-TRACK MAGNETIC RECORDING SYSTEM, A SIGNAL COMPONENT IS ADDED AT A FREQUENCY NEAR A CLOCK FREQUENCY SUCH THAT THE DIFFERENCE BETWEEN THIS SIGNAL AND THE CLOCK HAS A WAVELENGTH ON THE MAGNETIC MEDIA GREATER THAN THE MAXIMUM SKEW OF THE MULTITRACK SYSTEM. ALTERNATIVELY, A SIGNAL HAVING A WAVELENGTH GREATER THAN SUCH MAXIMUM SKEW CAN BE RECORDED WITH THE DATA SIGNALS AS A RESYNCHRONIZATION CONTROL SIGNAL COMPONENT. SUCH SIGNAL COMPONENT IS USABLE AS A RESYNCHRONIZATION PATTERN. WRITE ERRORS ARE DETECTED DURING RECORDING WITH SPECIAL CONTROL INDICIA RECORDED ON THE MEDIA INDICATING SUCH ERRORS. VARIOUS FORMS OF INDICIA ARE DESCRIBED INCLUDING SPECIAL DATA PATTERNS, SPECIAL SIGNAL COMPONENTS, AND THE LIKE. SPECIAL CIRCUITS ESTABLISHED FOR HANDLING DATA SIGNALS USING FRAMING OR RESYNCHRONIZATION TECHNIQUES ARE DESCRIBED.
Inventors
- 👤 M Cannon
Bibliographic Details
Claims Analysis
Total Claims: 0References 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) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |