JPS5592084A - Outline signal generation circuit - Google Patents
Outline signal generation circuitInfo
- Publication number
- JPS5592084A JPS5592084A JP16336078A JP16336078A JPS5592084A JP S5592084 A JPS5592084 A JP S5592084A JP 16336078 A JP16336078 A JP 16336078A JP 16336078 A JP16336078 A JP 16336078A JP S5592084 A JPS5592084 A JP S5592084A
- Authority
- JP
- Japan
- Prior art keywords
- noise components
- output
- level
- correction signal
- output terminal
- 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)
Abstract
PURPOSE: To improve the SN ratio of an outline correction signal by connecting an amplitude limiting amplifier having a negative feedback circuit to the output terminal which outputs the outline correction signal on a basis of the video signal from a TV camera unit, etc.
CONSTITUTION: An amplitude limiting amplifier having a negative feedback circuit consisting of transistor Q7, resistances R14∼R17, capacitors C2∼C4, and diodes D2 and D3 is connected to output terminal T2. This amplifier has a large gain and a low input impedance in the region of diodes D2 and D3 non-conduction and has a high impedance in the conduction region. Consequently, in respect to the output characteristic for differential inputs of transistors Q3 and Q4, no output appears when they are low-level, and an output appears when they are over a certain input level. As a result, the level of noise components can be made zero by selecting a proper constant as resistance R17 when the video signal including noise components is applied to input terminal T1, so that an outline correction signal of a good SN where noise components are compressed can be obtained from output terminal T2.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53163360A JPS5919665B2 (en) | 1978-12-29 | 1978-12-29 | Contour signal generation circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53163360A JPS5919665B2 (en) | 1978-12-29 | 1978-12-29 | Contour signal generation circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5592084A true JPS5592084A (en) | 1980-07-12 |
JPS5919665B2 JPS5919665B2 (en) | 1984-05-08 |
Family
ID=15772394
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP53163360A Expired JPS5919665B2 (en) | 1978-12-29 | 1978-12-29 | Contour signal generation circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5919665B2 (en) |
-
1978
- 1978-12-29 JP JP53163360A patent/JPS5919665B2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS5919665B2 (en) | 1984-05-08 |
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