JPS5547789A - Noise suppression circuit of pal system color encoder - Google Patents
Noise suppression circuit of pal system color encoderInfo
- Publication number
- JPS5547789A JPS5547789A JP12122078A JP12122078A JPS5547789A JP S5547789 A JPS5547789 A JP S5547789A JP 12122078 A JP12122078 A JP 12122078A JP 12122078 A JP12122078 A JP 12122078A JP S5547789 A JPS5547789 A JP S5547789A
- Authority
- JP
- Japan
- Prior art keywords
- chroma
- phase
- balance
- output
- noise suppression
- 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
- Processing Of Color Television Signals (AREA)
Abstract
PURPOSE: To suppress the noise component in chroma signal, by providing the comb type filter to each balance modulator output side of each chroma signal channel and synthesizing the both channels after noise suppression for chroma signals R-Y and B-Y respectively.
CONSTITUTION: The chroma signals R-Y and B-Y from the matrix circuit are given to the balance modulators BM3 and BM4 respectively. In BM3, the phase of the chroma signal R-Y is inverted every 1H and balance modulation of chrominance subcarrier SC is made and the output of BM3 is in-phase appearantly. Further, in BM4, the chroma subscrrier SC is in balance modulation with the chroma signal B-Y and the phase of the output is inverted every 1H. At the output of BM3 and BM4, the comb type filters CF1 and CF2 providing the delay circuits DL3 and DL4 having delay time of 1H are placed. Since the phase of R-Y given is the same at CF1, it can be added with R-Y immediately before with the adder AD.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12122078A JPS5857954B2 (en) | 1978-10-03 | 1978-10-03 | PAL color encoder noise suppression circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12122078A JPS5857954B2 (en) | 1978-10-03 | 1978-10-03 | PAL color encoder noise suppression circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5547789A true JPS5547789A (en) | 1980-04-04 |
JPS5857954B2 JPS5857954B2 (en) | 1983-12-22 |
Family
ID=14805853
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12122078A Expired JPS5857954B2 (en) | 1978-10-03 | 1978-10-03 | PAL color encoder noise suppression circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5857954B2 (en) |
-
1978
- 1978-10-03 JP JP12122078A patent/JPS5857954B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5857954B2 (en) | 1983-12-22 |
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