GB1127048A - Staggered scan facsimile - Google Patents
Staggered scan facsimileInfo
- Publication number
- GB1127048A GB1127048A GB203/66A GB20366A GB1127048A GB 1127048 A GB1127048 A GB 1127048A GB 203/66 A GB203/66 A GB 203/66A GB 20366 A GB20366 A GB 20366A GB 1127048 A GB1127048 A GB 1127048A
- Authority
- GB
- United Kingdom
- Prior art keywords
- line
- transitions
- phase
- signal
- signals
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
- H04N3/30—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical otherwise than with constant velocity or otherwise than in pattern formed by unidirectional, straight, substantially horizontal or vertical lines
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/00095—Systems or arrangements for the transmission of the picture signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/40—Picture signal circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/41—Bandwidth or redundancy reduction
- H04N1/411—Bandwidth or redundancy reduction for the transmission or storage or reproduction of two-tone pictures, e.g. black and white pictures
- H04N1/413—Systems or arrangements allowing the picture to be reproduced without loss or modification of picture-information
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N2201/00—Indexing scheme relating to scanning, transmission or reproduction of documents or the like, and to details thereof
- H04N2201/04—Scanning arrangements
- H04N2201/0402—Arrangements not specific to a particular one of the scanning methods covered by groups H04N1/04 - H04N1/207
- H04N2201/0458—Additional arrangements for improving or optimising scanning resolution or quality
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Facsimile Transmission Control (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
- Facsimile Image Signal Circuits (AREA)
- Facsimiles In General (AREA)
Abstract
1,127,048. Television; copying by scanning. XEROX CORP. 3 Jan., 1966 [4 Jan., 1965], No. 203/66. Heading H4F. To improve the image quality in a time and amplitude quantized facsimile or television system the transitions in different lines of transmitted video is synchronized to different clock signals having a common frequency but different phase, so that when reproduced the signals create marks which no longer line up in vertical rows i.e. the black-white transitions are staggered or offset from line to line. The video signal may be amplitude quantized in two steps, e.g. black and white, or more than two steps, and although preferably the transitions in alternate lines are offset by half the normal spacing between transitions the staggering may be such that only every third line is vertically aligned or the transitions in individual lines may be positioned in a random fashion. Since a staggered signal which changes in phase from line to line is not suitable for transmission over most communication links the signal before transmission is preferably passed through a variable delay circuit wherein the phase of the signals is altered to bring them into synchronism. Instead of synchronizing the sweeps of the transmitter and receiver to the clock reference and altering the phase of the signal derived from or supplied thereto as described in the detailed embodiment, the stagger may be introduced by altering the phase of the scanner or recorder sweeps with respect to the clock reference or by stepwise operation of a scanner.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US42306165A | 1965-01-04 | 1965-01-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1127048A true GB1127048A (en) | 1968-09-11 |
Family
ID=23677527
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB203/66A Expired GB1127048A (en) | 1965-01-04 | 1966-01-03 | Staggered scan facsimile |
Country Status (6)
Country | Link |
---|---|
BE (1) | BE674705A (en) |
DE (1) | DE1487803C3 (en) |
FR (1) | FR1465006A (en) |
GB (1) | GB1127048A (en) |
NL (1) | NL6600005A (en) |
SE (1) | SE342381B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4870495A (en) * | 1985-02-22 | 1989-09-26 | Canon Kabushiki Kaisha | Image sensing element and image sensing apparatus for recording a still image |
-
1965
- 1965-12-30 SE SE16952/65A patent/SE342381B/xx unknown
-
1966
- 1966-01-03 NL NL6600005A patent/NL6600005A/xx unknown
- 1966-01-03 GB GB203/66A patent/GB1127048A/en not_active Expired
- 1966-01-04 DE DE1487803A patent/DE1487803C3/en not_active Expired
- 1966-01-04 FR FR44819A patent/FR1465006A/en not_active Expired
- 1966-01-04 BE BE674705A patent/BE674705A/xx unknown
Also Published As
Publication number | Publication date |
---|---|
NL6600005A (en) | 1966-07-05 |
DE1487803C3 (en) | 1973-01-04 |
BE674705A (en) | 1966-05-03 |
SE342381B (en) | 1972-01-31 |
FR1465006A (en) | 1967-01-06 |
DE1487803A1 (en) | 1969-02-06 |
DE1487803B2 (en) | 1972-06-15 |
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