Patent US4792953A successfully refreshed from Google Patents.
US4792953A
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Digital signal error concealment
Assignee: Ampex Corp
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Filing: 1987-03-27
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Granted: 1988-12-20
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Expires: 2007-03-27
Abstract
Abstract Errors in data words recovered following the transmission of digital data having internal correlation are concealed by substituting recovered correlated words for recovered words suspected of being in error. Concealment may follow the correction of errors according to an error correcting code. Error flag signals are used to identify corresponding respective recovered words that are suspected of being in error. These error flag signals are counted over a predetermined totaling interval, and a concealment interval signal is generated for a concealment interval when the count exceeds a predetermined threshold count. Recovered correlated words are substituted for recovered words corresponding to respective error flags and for all other recovered words corresponding to a respective concealment interval. In accordance with one aspect of the invention, the concealment interval is centered upon the corresponding totaling interval. According to another aspect of the invention, the concealment interval signal is generated upon the occurrence of an error flag signal while the count exceeds the predetermined count. Also, the concealment interval signal is preferably restarted upon the occurrence of a subsequent error flag signal while the count exceeds the predetermined count.
Inventors
- 👤 Leonard A. Pasdera
- 👤 Maurice G. Lemoine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:08
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/07; G06F11/0703; G06F11/0751; G06F11/0754; G06F11/076; G11; G11B; G11B20/00; G11B20/10; G11B20/18; G11B20/1876; H; H04; H04N; H04N19/00; H04N19/85; H04N19/89; H04N19/895; G06F11/08; G06F11/10
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
109 words
A method for concealing errors in data words recovered following the transmission of digital data having internal correlation wherein recovered correlated words are substituted for recovered words suspected of being in error, said method comprising providing error flag signals identifying corresponding respective recovered words suspected of being in error after any error correction has been effected, counting said error flag signals over a predetermined totaling interval and generating a concealment interval signal over a concealment interval when the count exceeds a predetermined count, and substituting recovered correlated words for recovered words corresponding to respective error flags and for all other recovered words corresponding to a respective said concealment interval.
Claim 2
Independent Claim
109 words
A method for concealing errors in data words recovered following the transmission of digital data having internal correlation wherein recovered correlated words are substituted for recovered words suspected of being in error, said method comprising providing error flag signals identifying corresponding respective recovered words suspected of being in error after any error correction has been effected, counting said error flag signals over a predetermined totaling interval and generating a concealment interval signal over a concealment interval when the count exceeds a predetermined count, and substituting recovered correlated words for recovered words corresponding to respective error flags and for all other recovered words corresponding to a respective said concealment interval.
Claim 3
Dependent Claim
17 words
A method according to claim 1 wherein said concealment interval is centered upon the corresponding totaling interval.
Claim 4
Dependent Claim
60 words
A method according to claim 1 wherein said digital data transmission is performed using an error correcting code, data words recovered after transmission are error corrected according to said code, and said method for concealing is performed in respect to said recovered words after said correction, said error flag signals identifying corresponding respective recovered words suspected of residual uncorrected error.
Claim 5
Dependent Claim
17 words
A method according to claim 3 wherein said concealment interval is centered upon the corresponding totaling interval.
Claim 6
Dependent Claim
29 words
A method according to claim 1 wherein said concealment interval signal is generated upon the coincidence of an error flag signal and a said count exceeding said predetermined count.
Claim 7
Dependent Claim
17 words
A method according to claim 5 wherein said concealment interval is centered upon the corresponding totaling interval.
Claim 8
Dependent Claim
30 words
A method according to claim 5 wherein said concealment interval signal is restarted upon the coincidence of a subsequent error flag signal and a said count exceeding said predetermined count.
Claim 9
Dependent Claim
17 words
A method according to claim 7 wherein said concealment interval is centered upon the corresponding totaling interval.
Claim 10
Dependent Claim
29 words
A method according to claim 1 wherein said concealment interval signal is generated upon the coincidence of an error flag signal and a said count exceeding said predetermined count.
Claim 11
Dependent Claim
17 words
A method according to claim 9 wherein said concealment interval is centered upon the corresponding totaling interval.
Claim 12
Dependent Claim
30 words
A method according to claim 9 wherein said concealment interval signal is restarted upon the coincidence of a subsequent error flag signal and a said count exceeding said predetermined count.
Claim 13
Dependent Claim
17 words
A method according to claim 11 wherein said concealment interval is centered upon the corresponding totaling interval.
Claim 14
Independent Claim
41 words
A method according to any one of claims 1 to 12 wherein said words correspond to picture elements of a raster scan television image and said recovered correlated words are words correlated with said recovered words suspected of being in error.
Claim 15
Dependent Claim
30 words
A method according to claim 13 wherein said recovered correlated words are words derived from a field other than the field of said recovered words suspected of being in error.
Claim 16
Dependent Claim
30 words
A method according to claim 14 wherein said recovered correlated words are corresponding words from the field next preceding the field of said recovered words suspected of being in error.
Claim 17
Independent Claim
133 words
A system for concealing errors in data words recovered following the transmission of digital data having internal correlation wherein recovered correlated words are substituted for recovered words suspected of being in error, said system comprising means for identifying recovered words suspected of being in error after any error correction has been effected by providing corresponding respective error flag signals, means responsive to said error flag signals for counting said error flag signals over a predetermined totaling interval and generating a concealment interval signal over a concealment interval when the count exceeds a predetermined count, and means responsive to said error flag signals and said concealment interval signal for substituting recovered correlated words for recovered words corresponding to respective error flags and for all other recovered words corresponding to a respective said concealment interval.
Claim 18
Independent Claim
133 words
A system for concealing errors in data words recovered following the transmission of digital data having internal correlation wherein recovered correlated words are substituted for recovered words suspected of being in error, said system comprising means for identifying recovered words suspected of being in error after any error correction has been effected by providing corresponding respective error flag signals, means responsive to said error flag signals for counting said error flag signals over a predetermined totaling interval and generating a concealment interval signal over a concealment interval when the count exceeds a predetermined count, and means responsive to said error flag signals and said concealment interval signal for substituting recovered correlated words for recovered words corresponding to respective error flags and for all other recovered words corresponding to a respective said concealment interval.
Claim 19
Dependent Claim
70 words
A system according to claim 16 wherein said digital data transmission is performed using an error correcting code, data words recovered after transmission are error corrected according to said code, and said system for concealing is operative in respect to said recovered words after said correction, said means for identifying recovered words suspected of error being indicative of such words only as are suspected of remaining uncorrected after such correction.
Claim 20
Dependent Claim
34 words
A system according to claim 16 wherein said means for counting and generating generates said concealment interval signal upon the coincidence of an error flag signal and a said count exceeding said predetermined count.
Claim 21
Dependent Claim
35 words
A system according to claim 18 wherein said means for counting and generating restarts the concealment interval signal upon the coincidence of a subsequent error flag signal and a said count exceeding said predetermined count.
Claim 22
Independent Claim
22 words
A system according to any one of claims 16 to 19 wherein said concealment interval is centered upon the corresponding totaling interval.
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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) | 1991-12-20 | 1992-06-20 | 1992-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-20 | 1996-06-20 | 1996-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-20 | 2000-06-20 | 2000-12-20 | $7700.00 | Window Closed / Lapsed |