JPS5511678A - Noise reduction device - Google Patents
Noise reduction deviceInfo
- Publication number
- JPS5511678A JPS5511678A JP8494278A JP8494278A JPS5511678A JP S5511678 A JPS5511678 A JP S5511678A JP 8494278 A JP8494278 A JP 8494278A JP 8494278 A JP8494278 A JP 8494278A JP S5511678 A JPS5511678 A JP S5511678A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- signal
- value
- supplied
- absolute value
- 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
- 239000000203 mixture Substances 0.000 abstract 2
- 238000001514 detection method Methods 0.000 abstract 1
Landscapes
- Picture Signal Circuits (AREA)
Abstract
PURPOSE: To obtain a noise reduction device to ensure a high-quality picture by detecting the difference between the signal of the specified frame of the TV signal and the 1-frame preceding signal and then giving control after counting the number of signals whose absolute value are more than the set level.
CONSTITUTION: Difference signal M is obtained through detection circuit 3 between signal A of the present frame and signal B preceding by one frame, and the absolute value |M| is obtained through absolute value circuit 12. Value |M| is then supplied to mixture ratio generation circuit 13 to produce constant K as well as supplied to comparator 14 to be compared with set value D. In circuit 14, the absolute value larger than value D is supplied to counter circuit 15 where the units of |M| larger than D and counted. And the count output is supplied to mixer ratio control circuit 16 along with the output circuit 13. Circuit 16 reduces forcedly the value of K of mixture in case the output of circuit 13 is large on the screen featuring a big motion in order to lower the degree of improvement for S/N but with reduction given to the lowering of resolution. And in case the output of circuit 15 is small on the screen featuring a large still part, the improvement degree of S/N caused by K is increased in order to reduce the noise for a high picture quality.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8494278A JPS5511678A (en) | 1978-07-11 | 1978-07-11 | Noise reduction device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8494278A JPS5511678A (en) | 1978-07-11 | 1978-07-11 | Noise reduction device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5511678A true JPS5511678A (en) | 1980-01-26 |
| JPS6222312B2 JPS6222312B2 (en) | 1987-05-18 |
Family
ID=13844696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8494278A Granted JPS5511678A (en) | 1978-07-11 | 1978-07-11 | Noise reduction device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5511678A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS581383A (en) * | 1981-04-24 | 1983-01-06 | ゼネラル・エレクトリツク・カンパニイ | Device for reducing influence of noise in video television display |
| US4809069A (en) * | 1988-03-10 | 1989-02-28 | North American Philips Corporation | Multifunction memory for digital television |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5361226A (en) * | 1976-11-10 | 1978-06-01 | Cbs Inc | Device for reducing noise |
-
1978
- 1978-07-11 JP JP8494278A patent/JPS5511678A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5361226A (en) * | 1976-11-10 | 1978-06-01 | Cbs Inc | Device for reducing noise |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS581383A (en) * | 1981-04-24 | 1983-01-06 | ゼネラル・エレクトリツク・カンパニイ | Device for reducing influence of noise in video television display |
| US4809069A (en) * | 1988-03-10 | 1989-02-28 | North American Philips Corporation | Multifunction memory for digital television |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6222312B2 (en) | 1987-05-18 |
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