JPS5556775A - Noise eliminating circuit - Google Patents
Noise eliminating circuitInfo
- Publication number
- JPS5556775A JPS5556775A JP12970978A JP12970978A JPS5556775A JP S5556775 A JPS5556775 A JP S5556775A JP 12970978 A JP12970978 A JP 12970978A JP 12970978 A JP12970978 A JP 12970978A JP S5556775 A JPS5556775 A JP S5556775A
- Authority
- JP
- Japan
- Prior art keywords
- video signal
- filter
- time constant
- pass filter
- level
- 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
- Picture Signal Circuits (AREA)
- Tone Control, Compression And Expansion, Limiting Amplitude (AREA)
- Noise Elimination (AREA)
Abstract
PURPOSE: To decrease the waveform distortion and the residual noise by varying the time constant of the high-pass filter according to the scale of the signal amplitude.
CONSTITUTION: The high-band noise component of the video signal supplied to input terminal 1 is extracted by high-pass filter 2 and then limited under the fixed threshold level at limiter 3. And the noise component is eliminated from the video signal obtained by added to the original video signal in the opposite polarity at adder 4. Filter 2 consists of capacitor C and the primary differentiating circuit comprising variable impedance circuit 9 in which input resistance Rin varies according to the input signal level. When the level change of the video signal is large, the time constant of filter 2 is reduced.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12970978A JPS5556775A (en) | 1978-10-20 | 1978-10-20 | Noise eliminating circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12970978A JPS5556775A (en) | 1978-10-20 | 1978-10-20 | Noise eliminating circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5556775A true JPS5556775A (en) | 1980-04-25 |
JPS6222503B2 JPS6222503B2 (en) | 1987-05-18 |
Family
ID=15016255
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12970978A Granted JPS5556775A (en) | 1978-10-20 | 1978-10-20 | Noise eliminating circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5556775A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6219859U (en) * | 1985-07-17 | 1987-02-05 | ||
JPS62227278A (en) * | 1986-03-28 | 1987-10-06 | Sony Corp | Noise reduction circuit |
JP2015149677A (en) * | 2014-02-07 | 2015-08-20 | 株式会社リコー | High-pass filter circuit and bandpass filter circuit |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5338212A (en) * | 1976-08-30 | 1978-04-08 | Rca Corp | Noise attenuator |
-
1978
- 1978-10-20 JP JP12970978A patent/JPS5556775A/en active Granted
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5338212A (en) * | 1976-08-30 | 1978-04-08 | Rca Corp | Noise attenuator |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6219859U (en) * | 1985-07-17 | 1987-02-05 | ||
JPS62227278A (en) * | 1986-03-28 | 1987-10-06 | Sony Corp | Noise reduction circuit |
JP2015149677A (en) * | 2014-02-07 | 2015-08-20 | 株式会社リコー | High-pass filter circuit and bandpass filter circuit |
Also Published As
Publication number | Publication date |
---|---|
JPS6222503B2 (en) | 1987-05-18 |
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