US3792453A
Expired / Lapsed
US
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Data storage systems
Assignee: BAE Systems PLC
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Filing: 1971-11-03
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Granted: 1974-02-12
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Expires: 1991-11-03
Abstract
Abstract Apparatus for use in a data storage system having a parallel read mode and which comprises, for each track of a recording medium from which data is to be read simultaneously, storage means for storing data to be read, and means for extracting data from the data storage means at a predetermined instant such that data from each track is available for reading simultaneously. Thus the reading of data is effected by first recovering data from each track concerned and then aligning the data timewise for onward transmission to readout.
Inventors
- 👤 C Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:28
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/16; G11B20/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
110 words
Apparatus for each track of a recording medium of a data storage system from which data is to be simultaneously read in a parallel read mode, comprising shift register means coupled to receive data to be read, switch means coupled with said shift register means for extracting said data from said shift register means at a predetermined instant such that said data from each track is available for reading simultaneously, and control means for controlling said switch means to track a first significant bit through said shift register means until said predetermined instant when said data to be read is extracted from said shift register means via said switch means.
Claim 2
Dependent Claim
110 words
Apparatus for each track of a recording medium of a data storage system from which data is to be simultaneously read in a parallel read mode, comprising shift register means coupled to receive data to be read, switch means coupled with said shift register means for extracting said data from said shift register means at a predetermined instant such that said data from each track is available for reading simultaneously, and control means for controlling said switch means to track a first significant bit through said shift register means until said predetermined instant when said data to be read is extracted from said shift register means via said switch means.
Claim 3
Dependent Claim
128 words
Apparatus according to claim 1 wherein said control means comprises counter means coupled with said switch means, gate means coupled with said counter means and coupled to receive a pulse group comprising a predetermined number of pulses, and means coupling said gate means with said shift register means for rendering said gate means conductive to pass said pulses to said counter means upon receipt in said shift register means of said first significant bit, said counter means being operable to index said switch means synchronously with said shift register means until said predetermined number of pulses have been applied to said gate means whereupon said switch means ceases to track said first significant bit and begins to extract said data to be read from said shift register means.
Claim 4
Dependent Claim
37 words
Apparatus according to claim 1 further including delay means coupled with said shift register means for delaying data applied to said shift register means when said data coincides with a shift signal for said shift register means.
Claim 5
Dependent Claim
59 words
Apparatus according to claim 3 further including selection means for selecting the appropriate strobe phase to strobe data to be read, and a comparator coupled to the output of said selection means for rendering said delay means operative when there is coincidence between the phase of the selected strobe and that of a basic timing signal for said system.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |