US4476495A
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Multilevel signal compression method
Assignee: Hitachi Ltd
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Filing: 1982-04-01
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Granted: 1984-10-09
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Expires: 2002-04-01
Abstract
Abstract A digitized multilevel signal is encoded on the basis of unit combinations each including a run-length bit field indicative of run-length at each of the signal levels and a single continuation bit indicative of transition of the signal levels. The encoding is so modified that a virtual run of zero length is inserted when the transition of the signal levels at adjacent sampling points departs from a predetermined order. Polarity of the continuation bit is inverted upon every transition of the signal level.
Inventors
- 👤 Hiromichi Fujisawa
- 👤 Hirohide Endo
- 👤 Hitoshi Komatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:05
CPC Classifications
G; G06; G06T; G06T9/00; G06T9/005; H; H03; H03M; H03M7/00; H03M7/30; H03M7/46
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
98 words
A multilevel signal compression method in which a digitized multilevel signal is encoded in respect of run-lengths, wherein a code which is composed of unit combinations each of run-length bits indicative of the run-length at each of the signal levels and a single continuation bit indicative of transition of said signal level is so prepared as to include a virtual run of zero length when the transition of the signal levels at adjacent sampling points departs from a predetermined order, and polarity of said continuation bit is inverted upon every occurrence of said transition of the signal level.
Claim 2
Dependent Claim
98 words
A multilevel signal compression method in which a digitized multilevel signal is encoded in respect of run-lengths, wherein a code which is composed of unit combinations each of run-length bits indicative of the run-length at each of the signal levels and a single continuation bit indicative of transition of said signal level is so prepared as to include a virtual run of zero length when the transition of the signal levels at adjacent sampling points departs from a predetermined order, and polarity of said continuation bit is inverted upon every occurrence of said transition of the signal level.
Claim 3
Dependent Claim
32 words
A multilevel signal compression method according to claim 1, wherein the number of said run-length bits contained in each of said unit combinations is set independently for each of said signal 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) | 1987-10-09 | 1988-04-09 | 1988-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-09 | 1992-04-09 | 1992-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-09 | 1996-04-09 | 1996-10-09 | $7700.00 | Window Closed / Lapsed |