JPS6455971A - Noise reducing circuit - Google Patents
Noise reducing circuitInfo
- Publication number
- JPS6455971A JPS6455971A JP62213293A JP21329387A JPS6455971A JP S6455971 A JPS6455971 A JP S6455971A JP 62213293 A JP62213293 A JP 62213293A JP 21329387 A JP21329387 A JP 21329387A JP S6455971 A JPS6455971 A JP S6455971A
- Authority
- JP
- Japan
- Prior art keywords
- limitter
- subtractor
- coefficient
- noise reduction
- video signal
- 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
- Picture Signal Circuits (AREA)
- Television Signal Processing For Recording (AREA)
Abstract
PURPOSE:To obtain much noise reduction effect from a low frequency range even if an input video signal is of a small amplitude by providing a negative feedback circuit of a feedback coefficient usable from a limitter output to the input terminal of a high pass filter, to a conventional noise reduction circuit. CONSTITUTION:A coefficient unit 7 multiplies a high pass component Sd, in which a signal component more than a limited level outputted from a limitter 3 is removed, by a coefficient value K2, i.e., 0<=K2<=1/B. A subtractor 8 a high pass component K2.Sd which is level-adjusted in the coefficient unit 7 from the input video signal Si. The negative feedback circuit consists of the coefficient unit 7 and the subtractor 8. The output signal of the subtractor 8 is inputted to an HPF1. Since the value of a limitter gain L is enlarged as the amplitude of the input video signal Si becomes smaller, the characteristic of the frequency is considerably attenuated from low frequency to a high one. Thus, much noise reduction effect can be obtained.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62213293A JPS6455971A (en) | 1987-08-27 | 1987-08-27 | Noise reducing circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62213293A JPS6455971A (en) | 1987-08-27 | 1987-08-27 | Noise reducing circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6455971A true JPS6455971A (en) | 1989-03-02 |
Family
ID=16636721
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62213293A Pending JPS6455971A (en) | 1987-08-27 | 1987-08-27 | Noise reducing circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6455971A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5532027A (en) * | 1994-12-21 | 1996-07-02 | E. I. Du Pont De Nemours And Company | UV light treatment of clear coat to improve acid etch resistance |
-
1987
- 1987-08-27 JP JP62213293A patent/JPS6455971A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5532027A (en) * | 1994-12-21 | 1996-07-02 | E. I. Du Pont De Nemours And Company | UV light treatment of clear coat to improve acid etch resistance |
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