JPS5525283A - Picture signal addition circuit for facsimile modulation signal - Google Patents
Picture signal addition circuit for facsimile modulation signalInfo
- 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
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
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07205101A (en) * | 1994-01-14 | 1995-08-08 | Hitachi Koki Co Ltd | Portable electric circular saw |
-
1978
- 1978-08-14 JP JP9881578A patent/JPS6053501B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS6053501B2 (en) | 1985-11-26 |
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