JPS5525283A - Picture signal addition circuit for facsimile modulation signal - Google Patents

Picture signal addition circuit for facsimile modulation signal

Info

Publication number
JPS5525283A
JPS5525283A JP9881578A JP9881578A JPS5525283A JP S5525283 A JPS5525283 A JP S5525283A JP 9881578 A JP9881578 A JP 9881578A JP 9881578 A JP9881578 A JP 9881578A JP S5525283 A JPS5525283 A JP S5525283A
Authority
JP
Japan
Prior art keywords
signal
facsimile
picture
carrier frequency
synchronous
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.)
Granted
Application number
JP9881578A
Other languages
Japanese (ja)
Other versions
JPS6053501B2 (en
Inventor
Hideo Matsuda
Kankou Yuuki
Takashi Kawade
Kenichi Hanabe
Naoaki Adachi
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.)
Nippon Telegraph and Telephone Corp
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP9881578A priority Critical patent/JPS6053501B2/en
Priority to GB7921592A priority patent/GB2026282B/en
Priority to FR7917781A priority patent/FR2433867A1/en
Priority to US06/056,287 priority patent/US4255766A/en
Publication of JPS5525283A publication Critical patent/JPS5525283A/en
Publication of JPS6053501B2 publication Critical patent/JPS6053501B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Facsimile Image Signal Circuits (AREA)

Abstract

PURPOSE: To secure the addition of the facsimile picture signal with no deterioration of the picture quality by switching the carrier frequency signal of the facsimile modulation signal into the carrier frequency corresponding to the black signal within the signal addition device and via the synchronous and control signals and then transmitting the carrier frequency to the receiving device.
CONSTITUTION: The transmission original picture is converted into the electric signal via transmitting device 1 and then transmitted to repeating installation 2 after the frequency modulation. At the same time, the synchronous signal is extracted in installation 2 via synchronous signal detector 3, and the carrier frequency of the facsimile modulation signal is switched to the carrier frequency corresponding to the black signal within signal addition device 6 via the synchronous signal and the control signal sent from facsimile picture signal addition control unit 4 to be sent to receiving device 7. Device 7 demodulates the received facsimile modulation signal and then decoding it to the base band signal to reproduce the transmission original picture. Thus the facsimile picture signal can be added with no deterioration of the picture quality in a simple constitution.
COPYRIGHT: (C)1980,JPO&Japio
JP9881578A 1978-07-10 1978-08-14 Image signal addition circuit for facsimile modulation signal Expired JPS6053501B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP9881578A JPS6053501B2 (en) 1978-08-14 1978-08-14 Image signal addition circuit for facsimile modulation signal
GB7921592A GB2026282B (en) 1978-07-10 1979-06-21 Signal superimposing apparatus
FR7917781A FR2433867A1 (en) 1978-07-10 1979-07-09 OVERLAY SYSTEM FOR FAC-SIMILE
US06/056,287 US4255766A (en) 1978-07-10 1979-07-10 Facsimile signal superposing system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9881578A JPS6053501B2 (en) 1978-08-14 1978-08-14 Image signal addition circuit for facsimile modulation signal

Publications (2)

Publication Number Publication Date
JPS5525283A true JPS5525283A (en) 1980-02-22
JPS6053501B2 JPS6053501B2 (en) 1985-11-26

Family

ID=14229811

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9881578A Expired JPS6053501B2 (en) 1978-07-10 1978-08-14 Image signal addition circuit for facsimile modulation signal

Country Status (1)

Country Link
JP (1) JPS6053501B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07205101A (en) * 1994-01-14 1995-08-08 Hitachi Koki Co Ltd Portable electric circular saw

Also Published As

Publication number Publication date
JPS6053501B2 (en) 1985-11-26

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