JPS57136868A - Synchronous separating circuit - Google Patents
Synchronous separating circuitInfo
- Publication number
- JPS57136868A JPS57136868A JP2218781A JP2218781A JPS57136868A JP S57136868 A JPS57136868 A JP S57136868A JP 2218781 A JP2218781 A JP 2218781A JP 2218781 A JP2218781 A JP 2218781A JP S57136868 A JPS57136868 A JP S57136868A
- Authority
- JP
- Japan
- Prior art keywords
- filter
- synchronizing signal
- output
- component
- horizontal synchronizing
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/04—Synchronising
- H04N5/08—Separation of synchronising signals from picture signals
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Synchronizing For Television (AREA)
Abstract
PURPOSE:To prevent a phase shift due to a noise, a ghost, etc., by filtering a video signal through a filter which permits only a vertical and a horizontal synchronizing signal component to pass through it, and regenerating a synchronizing signal by using the horizontal synchronizing component during a vertical blanking interval. CONSTITUTION:A video signal is applied to an adding filter M-1 to eliminate an equalized pulse component and the high-frequency component of a video signal, thereby passing only a horizontal and a vertical synchronizing signal frequency component. The adding filter M-1 consists of an input-side low-pass filter, delay circuits which delays a filter output by a certain time respectively, an adder which adds the filter output and delay outputs, and an output-side low-pass filter. The output of the adding filter M-1 is applied to an analog switch M-2 to extract the horizontal synchronizing signal component during a vertical blanking interval, and it is applied to an automatic phase control circuit N to regenerate the horizontal synchronizing signal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2218781A JPS57136868A (en) | 1981-02-19 | 1981-02-19 | Synchronous separating circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2218781A JPS57136868A (en) | 1981-02-19 | 1981-02-19 | Synchronous separating circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57136868A true JPS57136868A (en) | 1982-08-24 |
JPS619788B2 JPS619788B2 (en) | 1986-03-26 |
Family
ID=12075784
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2218781A Granted JPS57136868A (en) | 1981-02-19 | 1981-02-19 | Synchronous separating circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57136868A (en) |
-
1981
- 1981-02-19 JP JP2218781A patent/JPS57136868A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPS619788B2 (en) | 1986-03-26 |
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