Patent US3713123A successfully refreshed from Google Patents.
US3713123A
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High density data recording and error tolerant data reproducing system
Assignee: General Electric Co
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Filing: 1969-12-18
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Granted: 1973-01-23
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Expires: 1989-12-18
Abstract
Abstract A high density recording and reproducing system in which information is divided into groups of binary digits (bits) with different flux transition patterns recorded in associated storage cells to represent each group of bits and wherein each pattern is recorded by providing a plurality of transition positions in each cell and is read by sensing signal polarity at selected positions according to decisions based on ternary pulse characteristics represented in the form of ternary digits (trits) thereby tolerating drop out and pick up errors at unsensed positions.
Inventors
- 👤 J Lipp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:53
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/14; G11B20/1403; G11B20/1423; G11B20/1426; G06; G06K; G06K19/00; G06K19/06; G06K19/06187
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
192 words
A system for recording information on a single track of a recording medium comprising: a source of electrical signals having binary values representative of the information to be recorded, the electrical signals being grouped into triplets of electrical signals for purposes of recording; a conversion means connected to said signal source for converting each triplet to a pattern of four successive ternary signals having negative, zero and positive values, each ternary pattern being related to a triplet by a code whereunder the ternary signals in the second and fourth positions in the pattern identify unique triplets, the first two and the last two positions in the pattern each include at least one non-zero ternary signal, the maximum number of successive positions in a pattern with a zero ternary signal is two, the polarity of the first non-zero ternary signal in a pattern is known, and successive non-zero ternary signals within a pattern alternate in polarity; and a recording head connected to said conversion means and responsive to ternary patterns produced thereby to record representations of the patterns on the recording medium wherein different ternary signals are represented by areas having different characteristics.
Claim 2
Independent Claim
192 words
A system for recording information on a single track of a recording medium comprising: a source of electrical signals having binary values representative of the information to be recorded, the electrical signals being grouped into triplets of electrical signals for purposes of recording; a conversion means connected to said signal source for converting each triplet to a pattern of four successive ternary signals having negative, zero and positive values, each ternary pattern being related to a triplet by a code whereunder the ternary signals in the second and fourth positions in the pattern identify unique triplets, the first two and the last two positions in the pattern each include at least one non-zero ternary signal, the maximum number of successive positions in a pattern with a zero ternary signal is two, the polarity of the first non-zero ternary signal in a pattern is known, and successive non-zero ternary signals within a pattern alternate in polarity; and a recording head connected to said conversion means and responsive to ternary patterns produced thereby to record representations of the patterns on the recording medium wherein different ternary signals are represented by areas having different characteristics.
Claim 3
Dependent Claim
57 words
A system as set forth in claim 1 further including means for reading the signal representations recorded in the second and fourth positions in each pattern while disregarding the representations recorded in the first and third positions, and means for decoding the signals read to identify the bit configuration of the triplet represented by the recorded pattern.
Claim 4
Dependent Claim
49 words
A system as recited in claim 2 wherein the recorded representations of non-zero ternary signals are magnetic flux transitions having one polarity for a positive ternary signal and another polarity for a negative ternary signal while a zero ternary signal is represented by the absence of a flux transition.
Claim 5
Dependent Claim
49 words
A system as recited in claim 1 wherein the recorded representations of non-zero ternary signals are magnetic flux transitions having one polarity for a positive ternary signal and another polarity for a negative ternary signal while a zero ternary signal is represented by the absence of a flux transition.
Claim 6
Independent Claim
211 words
A method of recording information along a single track in a recording medium including the steps of: generating electrical signals having binary values representative of the information to be recorded; grouping the binary electrical signals in successive triplets of binary electrical signals; converting each triplet of binary eleCtrical signals to a pattern of ternary electrical signals having negative, zero or positive values to be recorded at four successive transition positions on the single track, each unique triplet of binary signals being converted to a unique pattern of ternary signals through a conversion code where under the ternary signals in the second and fourth transition positions identify unique triplets of binary electrical signals, the first two and the last two transition positions in each pattern each include at least one non-zero ternary signal, the maximum number of successive transition positions with a zero ternary signal is two, the polarity of the first non-zero ternary signal in a pattern is known, and successive non-zero ternary signals within a pattern alternate in polarity; and generating successive magnetic flux reversals for successive non-zero ternary signals for magnetizing the recording medium at two or more of the transition positions in each pattern in a direction related to the polarity of the ternary signal to be recorded.
Claim 7
Independent Claim
211 words
A method of recording information along a single track in a recording medium including the steps of: generating electrical signals having binary values representative of the information to be recorded; grouping the binary electrical signals in successive triplets of binary electrical signals; converting each triplet of binary eleCtrical signals to a pattern of ternary electrical signals having negative, zero or positive values to be recorded at four successive transition positions on the single track, each unique triplet of binary signals being converted to a unique pattern of ternary signals through a conversion code where under the ternary signals in the second and fourth transition positions identify unique triplets of binary electrical signals, the first two and the last two transition positions in each pattern each include at least one non-zero ternary signal, the maximum number of successive transition positions with a zero ternary signal is two, the polarity of the first non-zero ternary signal in a pattern is known, and successive non-zero ternary signals within a pattern alternate in polarity; and generating successive magnetic flux reversals for successive non-zero ternary signals for magnetizing the recording medium at two or more of the transition positions in each pattern in a direction related to the polarity of the ternary signal to be recorded.
Claim 8
Dependent Claim
53 words
A method of reading information recorded by the method of claim 5 comprising sensing the presence of flux reversals recorded at the second and fourth transition positions only in each pattern, logically decoding the sensed fields to determine which triplet of binary digits is represented, and outputting the represented triplet of binary digits.
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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |