JPS54129919A - Facsimile transmission system - Google Patents

Facsimile transmission system

Info

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
Application number
JP3797578A
Other languages
Japanese (ja)
Inventor
Kunio Yasumi
Shuichi Takahashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
Priority to JP3797578A priority Critical patent/JPS54129919A/en
Publication of JPS54129919A publication Critical patent/JPS54129919A/en
Pending legal-status Critical Current

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  • Facsimile Image Signal Circuits (AREA)

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
JP3797578A 1978-03-31 1978-03-31 Facsimile transmission system Pending JPS54129919A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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