JPS5518121A - Isolator device for vertical synchronous signal - Google Patents
Isolator device for vertical synchronous signalInfo
- Publication number
- JPS5518121A JPS5518121A JP9053078A JP9053078A JPS5518121A JP S5518121 A JPS5518121 A JP S5518121A JP 9053078 A JP9053078 A JP 9053078A JP 9053078 A JP9053078 A JP 9053078A JP S5518121 A JPS5518121 A JP S5518121A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- synchronous signal
- vertical synchronous
- horizontal
- 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.)
- Pending
Links
Landscapes
- Synchronizing For Television (AREA)
- Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
- Television Systems (AREA)
Abstract
PURPOSE: To secure an accurate extraction of the vertical synchronous signal by using the horizontal synchronous pulse drawn out of the video signal.
CONSTITUTION: Output 2b of a low level can be obtained at the area of vertical synchronous pulse 11 by integrating composite synchronous signal 1a drawn out of the video signal. At the same time, horizontal syndhronous signal 2c is obtained by isolating horizontal synchronous signal part 14 from signal 1a. Signal 2c is changed into signal 2d of double frequency through PLL. In order to extract the area of vertical synchronous signal 1b, integration output 2b is supplied to terminal D of the D-type flip-flop, and then frequency 2d of double horizontal synchronous signal is supplied to terminal K. As a result, signal 1b is delivered from output terminal Q.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9053078A JPS5518121A (en) | 1978-07-26 | 1978-07-26 | Isolator device for vertical synchronous signal |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9053078A JPS5518121A (en) | 1978-07-26 | 1978-07-26 | Isolator device for vertical synchronous signal |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5518121A true JPS5518121A (en) | 1980-02-08 |
Family
ID=14000960
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9053078A Pending JPS5518121A (en) | 1978-07-26 | 1978-07-26 | Isolator device for vertical synchronous signal |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5518121A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56131273A (en) * | 1980-03-18 | 1981-10-14 | Hitachi Denshi Ltd | Sweep control circuit |
-
1978
- 1978-07-26 JP JP9053078A patent/JPS5518121A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56131273A (en) * | 1980-03-18 | 1981-10-14 | Hitachi Denshi Ltd | Sweep control circuit |
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