JPS54158129A - Color killer detection circuit - Google Patents
Color killer detection circuitInfo
- Publication number
- JPS54158129A JPS54158129A JP6677678A JP6677678A JPS54158129A JP S54158129 A JPS54158129 A JP S54158129A JP 6677678 A JP6677678 A JP 6677678A JP 6677678 A JP6677678 A JP 6677678A JP S54158129 A JPS54158129 A JP S54158129A
- Authority
- JP
- Japan
- Prior art keywords
- detection circuit
- color killer
- oscillator
- circuit
- signals
- 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
- Processing Of Color Television Signals (AREA)
Abstract
PURPOSE: To obtain a color killer detection circuit for the SECAM-system color television signals to perform the color killer action through a simple circuit constitution with no demodulator circuit required.
CONSTITUTION: The chromaticity signals given from chromaticity signal input terminal 1 are applied to mechanical oscillator 19 after extraction of only the back- porch area via the back-porch gate signals given from back-porch gate signal input terminal 17. Oscillator 19 features the central frequency of 282fH≈4.41MHz or 272fH≈4.25MHz and functions as a frequency discriminator. The output of oscillator 19 is applied to envelope curve detection circuit 20 to obtain the pulse flow featuring the fundamental wave of fH/2. The pulse flow is then applied to tank circuit 21 to extract only the fH/2 component, and the output level of the fH/2 component is converted into the direct wave through amplitude detection circuit 22. Then the color killer signals are generated when the DC level is less than the preset threshold level.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6677678A JPS54158129A (en) | 1978-06-05 | 1978-06-05 | Color killer detection circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6677678A JPS54158129A (en) | 1978-06-05 | 1978-06-05 | Color killer detection circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54158129A true JPS54158129A (en) | 1979-12-13 |
Family
ID=13325595
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6677678A Pending JPS54158129A (en) | 1978-06-05 | 1978-06-05 | Color killer detection circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54158129A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5755681A (en) * | 1980-09-21 | 1982-04-02 | Victor Co Of Japan Ltd | Secam signal generator |
JPS57136889A (en) * | 1981-02-18 | 1982-08-24 | Matsushita Electric Ind Co Ltd | Color killer circuit |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49129439A (en) * | 1973-04-10 | 1974-12-11 | ||
JPS5086225A (en) * | 1973-11-29 | 1975-07-11 |
-
1978
- 1978-06-05 JP JP6677678A patent/JPS54158129A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS49129439A (en) * | 1973-04-10 | 1974-12-11 | ||
JPS5086225A (en) * | 1973-11-29 | 1975-07-11 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5755681A (en) * | 1980-09-21 | 1982-04-02 | Victor Co Of Japan Ltd | Secam signal generator |
JPH0224077B2 (en) * | 1980-09-21 | 1990-05-28 | Victor Company Of Japan | |
JPS57136889A (en) * | 1981-02-18 | 1982-08-24 | Matsushita Electric Ind Co Ltd | Color killer circuit |
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