JPS54129919A - Facsimile transmission system - Google Patents
Facsimile transmission systemInfo
- Publication number
- JPS54129919A JPS54129919A JP3797578A JP3797578A JPS54129919A JP S54129919 A JPS54129919 A JP S54129919A JP 3797578 A JP3797578 A JP 3797578A JP 3797578 A JP3797578 A JP 3797578A JP S54129919 A JPS54129919 A JP S54129919A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- picture
- comparator
- shade
- relation
- 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.)
- Pending
Links
Abstract
PURPOSE: To perform facsimile transmission with gradation by obtaining a binary signal either by mixing an AC voltage, which has no relation to the light and shade of a picture into an analog picture signal or by applying a pulse signal, which has no relation to the light and shade of the picture, to a comparator.
CONSTITUTION: The picture of original 1 is read out by photoelectric converter element 3 and analog picture signal is compared with the signal of comparator circuit 5 to obtain a binary-coded signal. In this case, an AC voltage of 4sinθ which has no relation to the light and shade of the picture is applied by mixer 7 to analog picture signal S, the output of amplifier 4 and its output is supplied to comparator 5; in the other method, AC voltage 4sinθ is applied by comparator- signal generator 8 to comparator 5 as a pulse signal which has no relation to the light and shade of the picture. Consequently, a binary coded signal is obtained without making alterations in a facsimile equipment greatly, so that facsimile transmission with gradation can be attained.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3797578A JPS54129919A (en) | 1978-03-31 | 1978-03-31 | Facsimile transmission system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3797578A JPS54129919A (en) | 1978-03-31 | 1978-03-31 | Facsimile transmission system |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54129919A true JPS54129919A (en) | 1979-10-08 |
Family
ID=12512560
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3797578A Pending JPS54129919A (en) | 1978-03-31 | 1978-03-31 | Facsimile transmission system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54129919A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5694874A (en) * | 1979-12-28 | 1981-07-31 | Fujitsu Ltd | Video signal processor |
JPS56141678A (en) * | 1980-04-08 | 1981-11-05 | Seikosha Co Ltd | Picture recording equipment |
-
1978
- 1978-03-31 JP JP3797578A patent/JPS54129919A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5694874A (en) * | 1979-12-28 | 1981-07-31 | Fujitsu Ltd | Video signal processor |
JPS56141678A (en) * | 1980-04-08 | 1981-11-05 | Seikosha Co Ltd | Picture recording equipment |
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