US3633162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for correcting and indicating errors in redundantly recorded information
Assignee: Honeywell Inc
•
Filing: 1970-08-03
•
Granted: 1972-01-04
•
Expires: 1990-08-03
Abstract
Abstract Apparatus for recovering double-frequency-encoded information words redundantly recorded on two tracks of a magnetic medium, including means for separating clock bits and data bits of the information words to produce redundant data words and including means for combining the data words to produce a data word corrected for the absence of a data bit in one of the information words. Means for indicating dissimilarities in like position data bits in the redundant data words is also disclosed. Additionally, a word end marker comprising dissimilar parity bits in each of the information words is checked with the parity of the corrected data word and produces an error signal for any dissimilarities therebetween.
Inventors
- 👤 Heinz H Findeisen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:44
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/16; G06F11/1608; G06F11/1612
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
118 words
Apparatus for recovering information words redundantly recorded on a dual-track magnetic medium, said information words recorded utilizing double-frequency encoding wherein said information words include alternate clock and data bits, the presence of a data bit indicating a first binary number and the absence of a data bit indicating a second binary number, said apparatus comprising: A. means for receiving said information words from each of said tracks and for generating first and second data words respectively with said clock bits removed therefrom; and B. means for correcting for the absence of a data bit in one of said data words of a data bit representative of said first binary number and thereby generating a corrected data word therefrom.
Claim 2
Dependent Claim
118 words
Apparatus for recovering information words redundantly recorded on a dual-track magnetic medium, said information words recorded utilizing double-frequency encoding wherein said information words include alternate clock and data bits, the presence of a data bit indicating a first binary number and the absence of a data bit indicating a second binary number, said apparatus comprising: A. means for receiving said information words from each of said tracks and for generating first and second data words respectively with said clock bits removed therefrom; and B. means for correcting for the absence of a data bit in one of said data words of a data bit representative of said first binary number and thereby generating a corrected data word therefrom.
Claim 3
Dependent Claim
32 words
Apparatus as defined in claim 1 further including means for detecting dissimilarities in like-positioned data bits of said first and second data words and generating a data bit error signal indicative thereof.
Claim 4
Dependent Claim
20 words
Apparatus as defined in claim 2 further including means for generating a parity signal indicative of said corrected data word.
Claim 5
Dependent Claim
28 words
Apparatus as defined in claim 3 further including means for comparing said generated parity signal with the actual parity of said information words received from said magnetic medium.
Claim 6
Dependent Claim
22 words
Apparatus as defined in claim 4 further including means for generating a word sync error signal if said comparison is not true.
Claim 7
Dependent Claim
42 words
Apparatus as defined in claim 5 further including means for inhibiting the transfer of said corrected data word to a utilizing device when said data bit error signal and said word sync error signal occur during a given data word time frame.
Claim 8
Dependent Claim
85 words
Apparatus as defined in claim 1 wherein said recorded information words include a word end marker wherein said marker includes a parity bit in each of said information words, one of said parity bits representative of a first binary number and the other of said parity bits representative of a second binary number so as to indicate an even or odd parity and wherein said means for receiving and for generating retains said parity bits with said data bits in each of said data words.
Claim 9
Dependent Claim
25 words
Apparatus as defined in claim 7 further including means for detecting similarities in said parity bits and thereby generating a word end marker error signal.
Claim 10
Dependent Claim
32 words
Apparatus as defined in claim 8 further including means for detecting dissimilarities in like-positioned data bits of said first and second data words and generating a data bit error signal indicative thereof.
Claim 11
Dependent Claim
43 words
Apparatus as defined in claim 9 further including means for inhibiting the transfer of said corrected data word to a utilizing device where said data bit error signal and said word end marker error signal occur during a given data word time frame.
Claim 12
Dependent Claim
51 words
Apparatus as defined in claim 7 further including: A. means for detecting said parity of said word end marker; B. means for generating a parity signal indicative of said corrected data word; and C. means for generating a word sync error signal when said parity and said parity signal are dissimilar.
Claim 13
Dependent Claim
32 words
Apparatus as defined in claim 11 further including means for detecting dissimilarities in like-positioned data bits of said first and second data words and generating a data bit error signal indicative thereof.
Claim 14
Dependent Claim
33 words
Apparatus as defined in claim 1 further including means for generating a word sync error signal if like-positioned clock bits in each of said received information words are absent from said information words.
Claim 15
Dependent Claim
95 words
The combination of: A. a source of a first group of signals and another redundant source of a second group of the same signals, said first and second groups each including dissimilar parity signals indicative of a parity condition; B. means for combining said first and second groups of signals to generate a corrected group of signals; C. means for comparing the parity of said corrected group of signals with said parity condition indicated by said parity signals of said first and second groups of signals and generating a group error for a dissimilarity therebetween.
Claim 16
Dependent Claim
95 words
The combination of: A. a source of a first group of signals and another redundant source of a second group of the same signals, said first and second groups each including dissimilar parity signals indicative of a parity condition; B. means for combining said first and second groups of signals to generate a corrected group of signals; C. means for comparing the parity of said corrected group of signals with said parity condition indicated by said parity signals of said first and second groups of signals and generating a group error for a dissimilarity therebetween.
Claim 17
Dependent Claim
29 words
The combination as defined in claim 14 further including means for detecting Dissimilarities in like-positioned signals of said first and second groups and generating a signal error indicative thereof.
Claim 18
Dependent Claim
32 words
The combination as defined in claim 15 further including means for detecting similarities in said parity signals of said first and second groups of signals and thereby generating a parity signal error.
Claim 19
Dependent Claim
46 words
The combination as defined in claim 16 further including means for inhibiting the transfer of said corrected group of signals to a utilizing device when either said parity signal error or said group error is received in the same group time frame with said signal error.
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) | 1975-01-03 | 1975-07-05 | 1976-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-03 | 1979-07-05 | 1980-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-03 | 1983-07-05 | 1984-01-04 | $7700.00 | Window Closed / Lapsed |