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Patent US3994014A successfully refreshed from Google Patents.
US3994014A
Expired / Lapsed
US
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Circuit for rewriting blocks of phase encoded data
Assignee: Corning Glass Works
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Filing: 1975-12-10
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Granted: 1976-11-23
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Expires: 1995-12-10
Abstract
Abstract A system wherein a magnetic tape is divided into a plurality of data storage blocks, each of which is preceded by a unique block marker. A phase encoder and phase decoder associated with the read/write head are connected by a data control circuit to a computer. As the head scans the block marker, the phase decoder supplies the computer with the block marker data via the data control circuit. Immediately after a predetermined block marker has been read, the computer provides the data control circuit with a write-signal and makes available a byte of parallel data to be written on the tape. The data control circuit includes an erase latch activated by the ongoing transition of the write-signal for providing the phase encoder with an erase-signal which causes the first byte on the magnetic tape following the block marker to be an erased gap. Thus, during the read mode, the phase decoder will encounter this byte of erased tape after the block marker has been read to permit the phase decoder to become synchronized with respect to the stored data.
Inventors
- 👤 Samuel G. Burgiss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:33
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/14; G11B20/1403; G11B20/1407; G11B20/1419; G11B20/12; G11B20/1201; G11B20/1202; G11B20/1205
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
223 words
In a system for storing digital data on a magnetic medium comprising read-write means for writing data on said medium and for reading data from said medium, a phase encoder for receiving binary coded digital data and providing said read-write means with a phase encoded signal, said phase encoder having an erase input terminal for receiving an erase signal which causes said read-write means to erase said magnetic medium, a phase decoder for receiving a phase encoded signal from said read-write means and providing a binary coded digital signal, a data source and sink for providing write data bits which are to be written on said magnetic medium and for providing a write-signal which signifies the beginning of a write mode, and a data control circuit for transferring said write data bits to said phase encoder and for transferring said read data from said phase decoder to said data source and sink, said data control circuit being characterized in that it comprises an erase latch having an output terminal connected to the erase terminal of said phase encoder and an input terminal for receiving said write-signal from said data source and sink, said erase latch providing said phase encoder with an erase signal which causes erasure of said magnetic medium for a predetermined period of time following the ongoing transition of said write-signal.
Claim 2
Dependent Claim
223 words
In a system for storing digital data on a magnetic medium comprising read-write means for writing data on said medium and for reading data from said medium, a phase encoder for receiving binary coded digital data and providing said read-write means with a phase encoded signal, said phase encoder having an erase input terminal for receiving an erase signal which causes said read-write means to erase said magnetic medium, a phase decoder for receiving a phase encoded signal from said read-write means and providing a binary coded digital signal, a data source and sink for providing write data bits which are to be written on said magnetic medium and for providing a write-signal which signifies the beginning of a write mode, and a data control circuit for transferring said write data bits to said phase encoder and for transferring said read data from said phase decoder to said data source and sink, said data control circuit being characterized in that it comprises an erase latch having an output terminal connected to the erase terminal of said phase encoder and an input terminal for receiving said write-signal from said data source and sink, said erase latch providing said phase encoder with an erase signal which causes erasure of said magnetic medium for a predetermined period of time following the ongoing transition of said write-signal.
Claim 3
Dependent Claim
40 words
The system of claim 1 further comprising means for generating a WRITE CLOCK-signal which is connected to said phase encoder for providing the timing therein, said WRITE-signal being coupled to said WRITE CLOCK-signal generating means for initiating the operation thereof.
Claim 4
Dependent Claim
36 words
The system of claim 2 wherein said data source and sink also supplies an ERASE BIT-signal to said erase latch, resulting in the erasure of data from said magnetic medium for said predetermined period of time.
References Cited (Backward Citations)
US3710358A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-23 | 1980-05-24 | 1980-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-23 | 1984-05-24 | 1984-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-23 | 1988-05-24 | 1988-11-23 | $7700.00 | Window Closed / Lapsed |