JPS54159125A - Correction circuit - Google Patents
Correction circuitInfo
- Publication number
- JPS54159125A JPS54159125A JP6853878A JP6853878A JPS54159125A JP S54159125 A JPS54159125 A JP S54159125A JP 6853878 A JP6853878 A JP 6853878A JP 6853878 A JP6853878 A JP 6853878A JP S54159125 A JPS54159125 A JP S54159125A
- Authority
- JP
- Japan
- Prior art keywords
- level
- error
- signal
- chroma signal
- carrier
- 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
- H04N9/00—Details of colour television systems
- H04N9/44—Colour synchronisation
- H04N9/47—Colour synchronisation for sequential signals
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Processing Of Color Television Signals (AREA)
Abstract
PURPOSE: To obtain faster speed for the correction time and to achieve stable correction against noise, by changing the detection level of the circuit correcting error corresponding to the level of chroma signal, and taking the reference level when the reception electric field level is greater and lowering it when the level is small.
CONSTITUTION: The chroma demodulation circuits 6B and 6R demodulate the color difference signals Sb and Sr from the carrier chroma signal of SECAM of PAL system. Further, if the carrier chroma signal or carrier signal fed to the circuits 6B and 6R is in error from the normal signal, this is corrected. That is, the detection level of the circuit 25 correcting error is changed corresponding to the level of the chroma signal Sc, and when the reception electric field level is greater, it is taken as the reference level and when it is small, the level is lowered. Thus, the time until the error is corrected is faster and the correction can stably be made against noise.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6853878A JPS54159125A (en) | 1978-06-07 | 1978-06-07 | Correction circuit |
FR7914600A FR2428364A1 (en) | 1978-06-07 | 1979-06-07 | Colour demodulator for video signals in SECAM system - has comparator rapidly correcting erroneous colour identification and restoring proper commutator phase |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6853878A JPS54159125A (en) | 1978-06-07 | 1978-06-07 | Correction circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS54159125A true JPS54159125A (en) | 1979-12-15 |
JPS6153911B2 JPS6153911B2 (en) | 1986-11-19 |
Family
ID=13376610
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6853878A Granted JPS54159125A (en) | 1978-06-07 | 1978-06-07 | Correction circuit |
Country Status (2)
Country | Link |
---|---|
JP (1) | JPS54159125A (en) |
FR (1) | FR2428364A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5539433A (en) * | 1978-09-13 | 1980-03-19 | Toshiba Corp | Identification signal detection circuit in secam system |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5829677B2 (en) * | 1975-07-25 | 1983-06-24 | ソニー株式会社 | Irofukuchiyou Cairo |
-
1978
- 1978-06-07 JP JP6853878A patent/JPS54159125A/en active Granted
-
1979
- 1979-06-07 FR FR7914600A patent/FR2428364A1/en active Granted
Also Published As
Publication number | Publication date |
---|---|
FR2428364A1 (en) | 1980-01-04 |
JPS6153911B2 (en) | 1986-11-19 |
FR2428364B1 (en) | 1983-02-25 |
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