JPS5510248A - Addition circuit for picture signal for facsimile modulated signal - Google Patents

Addition circuit for picture signal for facsimile modulated signal

Info

Publication number
JPS5510248A
JPS5510248A JP8292678A JP8292678A JPS5510248A JP S5510248 A JPS5510248 A JP S5510248A JP 8292678 A JP8292678 A JP 8292678A JP 8292678 A JP8292678 A JP 8292678A JP S5510248 A JPS5510248 A JP S5510248A
Authority
JP
Japan
Prior art keywords
signal
facsimile
amplitude
picture
phase
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
JP8292678A
Other languages
Japanese (ja)
Inventor
Hideo Matsuda
Kiyohiro 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 JP8292678A priority Critical patent/JPS5510248A/en
Priority to GB7921592A priority patent/GB2026282B/en
Priority to CA000330357A priority patent/CA1117645A/en
Priority to FR7917781A priority patent/FR2433867A1/en
Priority to US06/056,287 priority patent/US4255766A/en
Publication of JPS5510248A publication Critical patent/JPS5510248A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To prevent the deterioration of a picture signal caused by a base-band signal by adding a facsimile picture signal to a facsimile modulated signal by lowering the amplitude level of a facsimile modulated signal after amplitude or amplitude- phase modulation.
CONSTITUTION: A transmitted original picture set to facsimile equipment 1 is scanned and converted by the photoelectric converter into an electric signal, which is given a phase synchronizing signal indicating the start of each scan and converted into a base signal before being sent out from equipment 1 as a facsimile modulated signal after two-phase amplitude/phase modulation. This modulated signal is inputted to repeater 2 and phase synchronous detector 3 of repeater 2 extracts the phase synchronizing signal; and signal level suppressor 5 is controlled by the synchronizing signal and a control signal from controller 4 for the addition of a previously-generated facsimile picture signal, thereby suppressing the amplitude level. Then, the need for the conversion of the facsimile modulated signal into the base- band signal is eliminated and the deterioration of the picture signal due to the base-band signal conversion is prevented.
COPYRIGHT: (C)1980,JPO&Japio
JP8292678A 1978-07-10 1978-07-10 Addition circuit for picture signal for facsimile modulated signal Pending JPS5510248A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
JP8292678A JPS5510248A (en) 1978-07-10 1978-07-10 Addition circuit for picture signal for facsimile modulated signal
GB7921592A GB2026282B (en) 1978-07-10 1979-06-21 Signal superimposing apparatus
CA000330357A CA1117645A (en) 1978-07-10 1979-06-22 Facsimile signal superposing system
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
JP8292678A JPS5510248A (en) 1978-07-10 1978-07-10 Addition circuit for picture signal for facsimile modulated signal

Publications (1)

Publication Number Publication Date
JPS5510248A true JPS5510248A (en) 1980-01-24

Family

ID=13787833

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8292678A Pending JPS5510248A (en) 1978-07-10 1978-07-10 Addition circuit for picture signal for facsimile modulated signal

Country Status (1)

Country Link
JP (1) JPS5510248A (en)

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