US4028535A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for generating a data code with a spectral null
Assignee: International Business Machines Corp
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Filing: 1976-06-11
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Granted: 1977-06-07
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Expires: 1996-06-11
Abstract
Abstract In a dynamic disc memory system, servo signal tracks and data tracks are adjacent. The servo track includes a signal having a predetermined frequency. With the system and method of this disclosure, the data recorded on the data track is translated to have a frequency null at the frequency of the servo signal track by translating apparatus to eliminate cross-talk at the servo frequency.
Inventors
- 👤 Peter Anthony Franaszek
- 👤 David Allen Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:46
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/14; G11B20/1403; G11B20/1423; G11B20/1426; H; H04; H04L; H04L25/00; H04L25/38; H04L25/40; H04L25/49; H04L25/4906
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
99 words
In a code signaling system, translating means for translating coded data to provide a spectral null at a predetermined frequency including an addressable translating apparatus for providing a coded output signal in response to a coded input signal, monitoring means for monitoring the output signals from said translating apparatus with respect to predetermined limit conditions for providing code selection data as a function of said output signals, said monitoring means having an output connected to supply said code selection data to modify the input signal to said translating means whereby said spectral null is achieved at said predetermined frequency.
Claim 2
Dependent Claim
99 words
In a code signaling system, translating means for translating coded data to provide a spectral null at a predetermined frequency including an addressable translating apparatus for providing a coded output signal in response to a coded input signal, monitoring means for monitoring the output signals from said translating apparatus with respect to predetermined limit conditions for providing code selection data as a function of said output signals, said monitoring means having an output connected to supply said code selection data to modify the input signal to said translating means whereby said spectral null is achieved at said predetermined frequency.
Claim 3
Dependent Claim
24 words
A system in accordance with claim 1 wherein said translating apparatus comprises a memory table, and said monitoring means includes parity and sine-cosine logic.
Claim 4
Dependent Claim
54 words
A magnetic recording system in accordance with claim 1 wherein the output of said translating apparatus is coupled to the write driver circuits of a magnetic recording head with a servo head adapted to receive servo control signals at the frequency of said spectral null from a servo track on a magnetic recording medium.
Claim 5
Independent Claim
91 words
A method for translating coded data to provide a spectral null at a predetermined frequency with an addressable translating table for providing a coded output corresponding to a coded signal, comprising translating input data with the table, monitoring the results from said translating table with respect to predetermined limit conditions for code selection address data as a function of said results, and using said code selection address data to modify the address used in the translating table for the next address whereby said spectral null is achieved at said predetermined frequency.
Claim 6
Independent Claim
91 words
A method for translating coded data to provide a spectral null at a predetermined frequency with an addressable translating table for providing a coded output corresponding to a coded signal, comprising translating input data with the table, monitoring the results from said translating table with respect to predetermined limit conditions for code selection address data as a function of said results, and using said code selection address data to modify the address used in the translating table for the next address whereby said spectral null is achieved at said predetermined frequency.
Claim 7
Dependent Claim
21 words
A method in accordance with claim 4 wherein said monitoring step includes calculating parity and sine-cosine relationships in the coded output.
Claim 8
Dependent Claim
48 words
A method in accordance with claim 4 including passing the coded output to the write driver circuits of a magnetic recording head with a servo head adapted to receive servo control signals at the frequency of the spectral null from a servo track on a magnetic recording medium.
Claim 9
Dependent Claim
80 words
Means for translating binary coded data to provide a spectral null at a predetermined frequency including, a code translator with tables of encoded data, control inputs for selectively changing the address data supplied to said translator, a plurality of summing means for maintaining running sums as a function of the output of said translator having an output connected to said control inputs, whereby the output code from said translator is modified to have a spectral null at said predetermined frequency.
Claim 10
Dependent Claim
80 words
Means for translating binary coded data to provide a spectral null at a predetermined frequency including, a code translator with tables of encoded data, control inputs for selectively changing the address data supplied to said translator, a plurality of summing means for maintaining running sums as a function of the output of said translator having an output connected to said control inputs, whereby the output code from said translator is modified to have a spectral null at said predetermined frequency.
References Cited (Backward Citations)
US3822404A
Cited
US3777130A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |