US4453267A
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US
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Signal compression apparatus and method
Assignee: NCR Voyix Corp
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Filing: 1981-06-08
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Granted: 1984-06-05
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Expires: 2001-06-08
Abstract
Abstract A method and apparatus are provided for digitizing an analog waveform and compressing the digitized information.
Inventors
- 👤 Bruno J. Paganini
- 👤 Jeram G. Advani
- 👤 Robert M. Whitely
- 👤 William J. Hale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:58
CPC Classifications
G; G07; G07C; G07C9/00; G07C9/30; G07C9/32; G07C9/35; G06; G06V; G06V10/00; G06V10/40; G06V10/42
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
143 words
A method of providing a compressed digitized representation of an analog signal comprising the steps of A. sampling the analog signal at a predetermined rate to provide a plurality of corresponding digital values and associated sample values; B. storing each digital value in a first location until the digital value corresponding to the next sample has been determined; C. comparing digital values to determine slope directions and zero value intervals of the analog signal; D. discarding each non-zero preceding digital value so long as the latest slope direction is the same as the preceding slope direction; E. storing a preceding digital value and associated sample value in a second location following each slope change and commencement and termination of a zero value interval of the analog signal; whereby a compressed digitized representation of the analog signal is provided in the second storage location.
Claim 2
Independent Claim
143 words
A method of providing a compressed digitized representation of an analog signal comprising the steps of A. sampling the analog signal at a predetermined rate to provide a plurality of corresponding digital values and associated sample values; B. storing each digital value in a first location until the digital value corresponding to the next sample has been determined; C. comparing digital values to determine slope directions and zero value intervals of the analog signal; D. discarding each non-zero preceding digital value so long as the latest slope direction is the same as the preceding slope direction; E. storing a preceding digital value and associated sample value in a second location following each slope change and commencement and termination of a zero value interval of the analog signal; whereby a compressed digitized representation of the analog signal is provided in the second storage location.
Claim 3
Independent Claim
181 words
A method of providing a compressed digitized representation of a signature comprising the steps of A. generating an analog signal from the act of writing the signature; B. sampling the analog signal at a predetermined rate to provide a plurality of corresponding digital values and associated sample values; C. storing all of the digital values for a given signature in a first location; D. sequentially fetching each digital value from said first location; E. temporarily storing each fetched digital value in a second location until the digital value corresponding to the next sample has been determined; F. comparing digital values to determine slope changes and zero value intervals of the analog signal; G. discarding each non-zero preceding digital value so long as the latest slope direction is the same as the preceding slope direction; and H. storing a preceding digital value and associated sample value in a third location following each slope change and commencement and termination of a zero value interval of the analog signal; whereby a compressed digitized representation of the signature is provided in the third storage location.
Claim 4
Independent Claim
181 words
A method of providing a compressed digitized representation of a signature comprising the steps of A. generating an analog signal from the act of writing the signature; B. sampling the analog signal at a predetermined rate to provide a plurality of corresponding digital values and associated sample values; C. storing all of the digital values for a given signature in a first location; D. sequentially fetching each digital value from said first location; E. temporarily storing each fetched digital value in a second location until the digital value corresponding to the next sample has been determined; F. comparing digital values to determine slope changes and zero value intervals of the analog signal; G. discarding each non-zero preceding digital value so long as the latest slope direction is the same as the preceding slope direction; and H. storing a preceding digital value and associated sample value in a third location following each slope change and commencement and termination of a zero value interval of the analog signal; whereby a compressed digitized representation of the signature is provided in the third storage location.
Claim 5
Dependent Claim
145 words
Apparatus for providing a compressed digitized representation of an analog signal comprising means for sampling the analog signal at a predetermined rate to provide a plurality of corresponding digital values and associated sample values; means for storing each digital value in a first location until the digital value corresponding to the next sample has been determined; means for comparing digital values to determine slope changes and zero value intervals of the analog signal; means for discarding each non-zero preceding digital value so long as the latest slope direction is the same as the preceding slope direction; and means for storing a preceding digital value and associated sample value in a second location following each slope change and commencement and termination of a zero value interval of the analog signal; whereby a compressed digitized representation of the analog signal is provided in the second storage location.
Claim 6
Dependent Claim
145 words
Apparatus for providing a compressed digitized representation of an analog signal comprising means for sampling the analog signal at a predetermined rate to provide a plurality of corresponding digital values and associated sample values; means for storing each digital value in a first location until the digital value corresponding to the next sample has been determined; means for comparing digital values to determine slope changes and zero value intervals of the analog signal; means for discarding each non-zero preceding digital value so long as the latest slope direction is the same as the preceding slope direction; and means for storing a preceding digital value and associated sample value in a second location following each slope change and commencement and termination of a zero value interval of the analog signal; whereby a compressed digitized representation of the analog signal is provided in the second storage location.
Claim 7
Dependent Claim
185 words
Apparatus for providing a compressed digitized representation of a signature comprising means for generating an analog signal from the act of writing the signature; means for sampling the analog signal at a predetermined rate to provide a plurality of corresponding digital values and associated sample values; means for storing all of the digital values for a given signature in a first location; means for sequentially fetching each digital value from said first location; means for temporarily storing each fetched digital value in a second location until the digital value corresponding to the next sample has been determined; means for comparing digital values to determine slope changes and zero value intervals of the analog signal; means for discarding each non-zero preceding digital value so long as the latest slope direction is the same as the preceding slope direction; and means for storing a preceding digital value and associated sample value in a third location following each slope change and commencement and termination of a zero value interval of the analog signal; whereby a compressed digitized representation of the signature is provided in the third storage location.
Claim 8
Dependent Claim
185 words
Apparatus for providing a compressed digitized representation of a signature comprising means for generating an analog signal from the act of writing the signature; means for sampling the analog signal at a predetermined rate to provide a plurality of corresponding digital values and associated sample values; means for storing all of the digital values for a given signature in a first location; means for sequentially fetching each digital value from said first location; means for temporarily storing each fetched digital value in a second location until the digital value corresponding to the next sample has been determined; means for comparing digital values to determine slope changes and zero value intervals of the analog signal; means for discarding each non-zero preceding digital value so long as the latest slope direction is the same as the preceding slope direction; and means for storing a preceding digital value and associated sample value in a third location following each slope change and commencement and termination of a zero value interval of the analog signal; whereby a compressed digitized representation of the signature is provided in the third storage location.
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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) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |