US3723640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for rapidly scanning a document
Assignee: Xerox Corp
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Filing: 1970-06-19
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Granted: 1973-03-27
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Expires: 1990-06-19
Abstract
Abstract A facsimile system wherein each elemental line of an object is scanned rapidly. Lines bearing low resolution information are scanned rapidly once, video and step command signals being transmitted at the end of the scan. Lines containing high resolution information are scanned rapidly twice. A first video signal is transmitted during the first scan and the remainder of the video signal is transmitted during the rescan, the step command signal being transmitted at the end of the rescan.
Inventors
- 👤 D Perreault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:05
CPC Classifications
H; H04; H04N; H04N1/00; H04N1/04; H04N1/17
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
211 words
A facsimile transmitter comprising: a. scanning means for scanning a line across an object to be transmitted and generating an electrical video signal proportional to the intensity of light reflected from said scan line, b. means for advancing said scan line in uniform increments in a direction substantially perpendicular to itself, c. means for encoding said electrical video signal into pulses, said encoded pulses occurring at transitions or some predetermined relationship to the transitions of said electrical video signal, the bandwidth of said encoded pulses being independent of the scanning rate of said scanning means, d. first means responsive to a low resolution encoded video signal generated by said encoding means for operating said advance means at the end of a scan line and for transmitting said low resolution encoded video signal during the time said line is being scanned, and e. second means responsive to a high resolution encoded video signal generated by said encoding means for causing the rescan of a scan line and operating said advance means at the end thereof, a selected portion of said high resolution encoded video signal being transmitted during the first scan of said line and the remainder of said high resolution encoded video signal being transmitted during the rescan of said line.
Claim 2
Dependent Claim
211 words
A facsimile transmitter comprising: a. scanning means for scanning a line across an object to be transmitted and generating an electrical video signal proportional to the intensity of light reflected from said scan line, b. means for advancing said scan line in uniform increments in a direction substantially perpendicular to itself, c. means for encoding said electrical video signal into pulses, said encoded pulses occurring at transitions or some predetermined relationship to the transitions of said electrical video signal, the bandwidth of said encoded pulses being independent of the scanning rate of said scanning means, d. first means responsive to a low resolution encoded video signal generated by said encoding means for operating said advance means at the end of a scan line and for transmitting said low resolution encoded video signal during the time said line is being scanned, and e. second means responsive to a high resolution encoded video signal generated by said encoding means for causing the rescan of a scan line and operating said advance means at the end thereof, a selected portion of said high resolution encoded video signal being transmitted during the first scan of said line and the remainder of said high resolution encoded video signal being transmitted during the rescan of said line.
Claim 3
Dependent Claim
104 words
The facsimile transmitter as defined in claim 1 wherein said high resolution encoded video signal comprises pulses spaced less than a minimum pulse spacing and wherein said low resolution encoded video signal comprises pulses having a spacing equal to or greater than said minimum pulse spacing, the portion of said high resolution encoded video signal transmitted during said first scan corresponding to pulses having a spacing equal to or greater than said minimum pulse spacing, the remainder of said high resolution encoded video signal transmitted during said rescan corresponding to pulses also having a spacing equal to or greater than said minimum pulse spacing.
Claim 4
Dependent Claim
14 words
means for generating a signal indicative of the operation of said transmitter advance means,
Claim 5
Dependent Claim
14 words
means for generating a signal indicative of the operation of said transmitter advance means,
Claim 6
Dependent Claim
97 words
a receiver comprising: a. continuously operating scan means to repetitively scan a recording element at uniform velocity in a line across a recording medium in record relationship therewith, b. advance means for intermittently advancing said line in fixed increments in a direction substantially perpendicular to itself, c. means for operating said advance means only in response to received signals indicative of the operation of said transmitter advance means, d. means for decoding received encoded video signals, and e. means for coupling said decoded signals to said recording element for a length of time corresponding to one scan.
Claim 7
Dependent Claim
97 words
a receiver comprising: a. continuously operating scan means to repetitively scan a recording element at uniform velocity in a line across a recording medium in record relationship therewith, b. advance means for intermittently advancing said line in fixed increments in a direction substantially perpendicular to itself, c. means for operating said advance means only in response to received signals indicative of the operation of said transmitter advance means, d. means for decoding received encoded video signals, and e. means for coupling said decoded signals to said recording element for a length of time corresponding to one scan.
Claim 8
Dependent Claim
37 words
The facsimile transmitter as defined in claim 2 further including means for adjusting said second responsive means whereby it is operative only for a predetermined number of occurrences of high resolution information in said encoded video signal.
Claim 9
Dependent Claim
43 words
The facsimile transmitter as defined in claim 2 wherein the minimum pulse spacing is selected so that said encoded video signal is transmitted through an associated transmission channel to a receiver whereat a copy of the object of a predetermined resolution is reproduced.
Claim 10
Dependent Claim
304 words
A facsimile transmitter comprising: a. scanning means for scanning a line across an object to be transmitted and generating an electrical video signal proportional to the intensity of light reflected from said scan line, b. means for advancing said scan line in uniform increments in a direction substantially perpendicular to itself, c. means for encoding said electrical video signal into pulses, said encoded pulses occurring at transitions or some predetermined relationship to the transition of said electrical video signal, the bandwidth of said encoded pulses being independent of the scanning rate of said scanning means, d. first means responsive to a low resolution encoded video signal generated by said encoding means for operating said advance means at the end of a scan line and for transmitting said low resolution encoded video signal during the time said line is being scanned, and e. second means responsive to a high resolution encoded video signal generated by said encoding means for causing the rescan of a scan line and operating said advance means at the end thereof, a selected portion of said high resolution encoded video signal being transmitted during the first scan of said line and the remainder of said high resolution encoded video signal being transmittEd during the rescan of said line, wherein the minimum pulse spacing is selected so that said encoded video signal is transmitted through an associated transmission channel to a receiver whereat a copy of the object of a predetermined resolution is reproduced, the portion of said high resolution encoded video signal transmitted during said first scan corresponding to pulses having a spacing equal to or greater than said minimum pulse spacing, the remainder of said high resolution encoded video signal transmitted during said rescan corresponding to pulses also having a spacing equal to or greater than said minimum pulse spacing.
Claim 11
Dependent Claim
304 words
A facsimile transmitter comprising: a. scanning means for scanning a line across an object to be transmitted and generating an electrical video signal proportional to the intensity of light reflected from said scan line, b. means for advancing said scan line in uniform increments in a direction substantially perpendicular to itself, c. means for encoding said electrical video signal into pulses, said encoded pulses occurring at transitions or some predetermined relationship to the transition of said electrical video signal, the bandwidth of said encoded pulses being independent of the scanning rate of said scanning means, d. first means responsive to a low resolution encoded video signal generated by said encoding means for operating said advance means at the end of a scan line and for transmitting said low resolution encoded video signal during the time said line is being scanned, and e. second means responsive to a high resolution encoded video signal generated by said encoding means for causing the rescan of a scan line and operating said advance means at the end thereof, a selected portion of said high resolution encoded video signal being transmitted during the first scan of said line and the remainder of said high resolution encoded video signal being transmittEd during the rescan of said line, wherein the minimum pulse spacing is selected so that said encoded video signal is transmitted through an associated transmission channel to a receiver whereat a copy of the object of a predetermined resolution is reproduced, the portion of said high resolution encoded video signal transmitted during said first scan corresponding to pulses having a spacing equal to or greater than said minimum pulse spacing, the remainder of said high resolution encoded video signal transmitted during said rescan corresponding to pulses also having a spacing equal to or greater than said minimum pulse spacing.
Claim 12
Dependent Claim
17 words
The facsimile transmitter as defined in claim 5 further including means for varying the minimum pulse spacing.
Claim 13
Dependent Claim
5 words
A facsimile transmission system comprising:
Claim 14
Dependent Claim
5 words
A facsimile transmission system comprising:
Claim 15
Independent Claim
198 words
A method of facsimile transmission comprising the steps of: a. scanning a line across an object to be transmitted, b. generating an electrical video signal proportional to the intensity of light reflected from said scan line, c. encoding said electrical video signal into pulses, said encoded pulses occurring at transitions or some predetermined relationship to the transitions of said electrical video signal, the bandwidth of said encoded pulses being independenT of the scanning rate, d. determining the information content of said encoded video signal and advancing said line in uniform increments in a direction substantially perpendicular to itself and at the end of said scan if said encoded video signal contains low resolution information, e. rescanning said scan line if said encoded video signal contains high resolution information and advancing said line in uniform increments in a direction substantially perpendicular to itself and at the end of said rescan, and f. transmitting said encoded video signal during said scan line if the encoded video signal contains low resolution information and transmitting a selected portion of the encoded video signal during the first scan and the remainder during the rescan if the encoded video signal contains high resolution information.
Claim 16
Independent Claim
198 words
A method of facsimile transmission comprising the steps of: a. scanning a line across an object to be transmitted, b. generating an electrical video signal proportional to the intensity of light reflected from said scan line, c. encoding said electrical video signal into pulses, said encoded pulses occurring at transitions or some predetermined relationship to the transitions of said electrical video signal, the bandwidth of said encoded pulses being independenT of the scanning rate, d. determining the information content of said encoded video signal and advancing said line in uniform increments in a direction substantially perpendicular to itself and at the end of said scan if said encoded video signal contains low resolution information, e. rescanning said scan line if said encoded video signal contains high resolution information and advancing said line in uniform increments in a direction substantially perpendicular to itself and at the end of said rescan, and f. transmitting said encoded video signal during said scan line if the encoded video signal contains low resolution information and transmitting a selected portion of the encoded video signal during the first scan and the remainder during the rescan if the encoded video signal contains high resolution information.
Claim 17
Dependent Claim
104 words
The method as defined in claim 8 wherein said high resolution encoded video signal comprises pulses spaced less than a minimum pulse spacing and wherein said low resolution encoded video signal comprises pulses having a spacing equal to or greater than said minimum pulse spacing, the selected portion of said high resolution encoded video signal transmitted during said first scan corresponding to pulses having a spacing equal to or greater than said minimum pulse spacing, the remainder of said high resolution encoded video signal transmitted during said rescan corresponding to pulses also having a spacing equal to or greater than said minimum pulse spacing.
Claim 18
Dependent Claim
30 words
The method as defined in claim 9 wherein the number of occurrences of high resolution information in the encoded video signal determines if the scan line is to be rescanned.
Claim 19
Dependent Claim
42 words
The method as defined in claim 9 wherein the minimum pulse spacing is selected so that said encoded video signal is transmitted through an associated transmission channel to a receiver whereat a copy of the object of a predetermined resolution is reproduced.
Claim 20
Independent Claim
329 words
A method of facsimile transmission comprising the steps of: a. scanning a line across an object to be transmitted, b. generating an electrical video signal proportional to the intensity of light reflected from said scan line, c. encoding said electrical video signal into pulses, said encoded pulses occurring at transitions or some predetermined relationship to the transitions of said electrical video signal, the bandwidth of said encoded pulses being independent of the scanning rate, d. determining the information content of said encoded video signal and advancing said line in uniform increments in a direction substantially perpendicular to itself and at the end of a scan if said encoded video signal contains low resolution information, e. rescanning said scan line if said encoded video signal contains high resolution information and advancing said line in uniform increments in a direction substantially perpendicular to itself and at the end of said rescan, and f. transmitting said encoded video signal during said scan line if the encoded video signal contains low resolution information and transmitting a selected portion of the encoded video signal during the first scan and the remainder during the rescan if the encoded video signal contains high resolution information, wherein said high resolution encoded video signal comprises pulses spaced less then a minimum pulse spacing and wherein said low resolution encoded video signal comprises pulses having a spacing equal to or greater than said minimum pulse spacing, the minimum pulse spacing being selected so that said encoded video signal is transmitted through an associated transmission channel to a receiver whereat a copy of the object of a predetermined resolution is reproduced, the selected portion of said high resolution encoded video signal transmitted during said first scan corresponding to pulses having a spacing equal to or greater than said minimum pulse spacing, the remainder of said high resolution encoded video signal transmitted during said rescan corResponding to pulses also having a spacing equal to or greater than said minimum pulse spacing.
Claim 21
Independent Claim
329 words
A method of facsimile transmission comprising the steps of: a. scanning a line across an object to be transmitted, b. generating an electrical video signal proportional to the intensity of light reflected from said scan line, c. encoding said electrical video signal into pulses, said encoded pulses occurring at transitions or some predetermined relationship to the transitions of said electrical video signal, the bandwidth of said encoded pulses being independent of the scanning rate, d. determining the information content of said encoded video signal and advancing said line in uniform increments in a direction substantially perpendicular to itself and at the end of a scan if said encoded video signal contains low resolution information, e. rescanning said scan line if said encoded video signal contains high resolution information and advancing said line in uniform increments in a direction substantially perpendicular to itself and at the end of said rescan, and f. transmitting said encoded video signal during said scan line if the encoded video signal contains low resolution information and transmitting a selected portion of the encoded video signal during the first scan and the remainder during the rescan if the encoded video signal contains high resolution information, wherein said high resolution encoded video signal comprises pulses spaced less then a minimum pulse spacing and wherein said low resolution encoded video signal comprises pulses having a spacing equal to or greater than said minimum pulse spacing, the minimum pulse spacing being selected so that said encoded video signal is transmitted through an associated transmission channel to a receiver whereat a copy of the object of a predetermined resolution is reproduced, the selected portion of said high resolution encoded video signal transmitted during said first scan corresponding to pulses having a spacing equal to or greater than said minimum pulse spacing, the remainder of said high resolution encoded video signal transmitted during said rescan corResponding to pulses also having a spacing equal to or greater than said minimum pulse spacing.
Claim 22
Dependent Claim
16 words
The method as defined in claim 12 including the step of varying the minimum pulse spacing.
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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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |