US3662365A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dynamic amplitude control for magnetic tape systems
Assignee: Storage Technology Corp
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Filing: 1970-03-23
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Granted: 1972-05-09
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Expires: 1990-03-23
Abstract
Abstract A magnetic tape system in which read heads sense signal fluctuations in the tracks in a moving magnetic tape includes dynamic amplitude control. The signals from a plurality of tracks are averaged and compared to predetermined levels. A digital counter is set in accordance with the level of the average signal. The digital counter changes the gain of the signal produced by the magnetic head. Gain changes are made only upon the occurrence of the end of the record being read.
Inventors
- 👤 Juan A Rodriguez
- 👤 Roger A Monroe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:40
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3005; H03G3/3026; G; G11; G11B; G11B5/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
174 words
In a magnetic tape system of the type having a plurality of magnetic tape units connected to a common read bus, a dynamic amplitude control system for each magnetic tape unit comprising: at least one magnetic read head for sensing data records of information-bearing signals successively recorded in a plurality of tracks on a moving magnetic tape, means for producing a gain control signal representing the amplitude of the recorded signals being sensed during the reading of each data record, a digital counter for storing a count during the reading of one data record corresponding to the gain control signal produced during the reading of the previous data record, means for setting said counter for the reading of the next data record in accordance with the magnitude of said gain control signal produced during the reading of said one data record, and gain control means connected between said read heads and said read bus for changing the gain of the signal applied to said read bus in accordance with the setting of said counter.
Claim 2
Dependent Claim
174 words
In a magnetic tape system of the type having a plurality of magnetic tape units connected to a common read bus, a dynamic amplitude control system for each magnetic tape unit comprising: at least one magnetic read head for sensing data records of information-bearing signals successively recorded in a plurality of tracks on a moving magnetic tape, means for producing a gain control signal representing the amplitude of the recorded signals being sensed during the reading of each data record, a digital counter for storing a count during the reading of one data record corresponding to the gain control signal produced during the reading of the previous data record, means for setting said counter for the reading of the next data record in accordance with the magnitude of said gain control signal produced during the reading of said one data record, and gain control means connected between said read heads and said read bus for changing the gain of the signal applied to said read bus in accordance with the setting of said counter.
Claim 3
Dependent Claim
38 words
The system recited in claim 1 further including: means for producing a signal indicating the end of said one record and, means for changing the setting of said counter only upon receipt of the end of record signal.
Claim 4
Dependent Claim
27 words
The system recited in claim 1 wherein said means for producing a gain control signal includes: means for averaging the signals from a plurality of said tracks.
Claim 5
Dependent Claim
44 words
The system recited in claim 3 further comprising: comparators for comparing the averaged signal to reference levels, said means for setting said counter including logic circuitry for setting said counter in accordance with the magnitude of said averaged signal relative to said reference levels.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |