JPS554745A - Video signal detection circuit - Google Patents
Video signal detection circuitInfo
- Publication number
- JPS554745A JPS554745A JP7741178A JP7741178A JPS554745A JP S554745 A JPS554745 A JP S554745A JP 7741178 A JP7741178 A JP 7741178A JP 7741178 A JP7741178 A JP 7741178A JP S554745 A JPS554745 A JP S554745A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- video signal
- components
- current proportional
- dependent
- 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
- 238000001514 detection method Methods 0.000 title abstract 4
- 230000001419 dependent effect Effects 0.000 abstract 3
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 abstract 2
- 230000000737 periodic effect Effects 0.000 abstract 1
Landscapes
- Television Receiver Circuits (AREA)
- Television Signal Processing For Recording (AREA)
Abstract
PURPOSE: To take out a detection voltage having no temperature drift dependent upon DC components by taking out only signal components by a differential amplifier which is formed by PNP transistors.
CONSTITUTION: A synchronizing negative-polarity video signal obtained by clamping the leading edge of a periodic signal is applied to the bases of the PNP transistors 17 and 18, and the voltage of the power source 5 having the same potential as the leading edge of the synchronizing signal is applied to the bases of the PNP transistors 16 and 19, and a collector current proportional to the magnitude of the synchronizing signal is flowed to the transistor 19 through the switch 4, which is turned on in a pedestal period by a gate pulse, and the resistance 15 in the pedestal period. Consequently, a current proportional to the video signal from a differential amplifier dependent upon the transistors 16, 17, 18 and 19 and a current proportional to the synchronizing signal are flowed to the resistance 15, and a detection voltage having no temperature drift dependent upon CD components is taken out from the peak detection circuit 3 by the addition current of them.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7741178A JPS554745A (en) | 1978-06-28 | 1978-06-28 | Video signal detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7741178A JPS554745A (en) | 1978-06-28 | 1978-06-28 | Video signal detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS554745A true JPS554745A (en) | 1980-01-14 |
| JPS6238906B2 JPS6238906B2 (en) | 1987-08-20 |
Family
ID=13633176
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7741178A Granted JPS554745A (en) | 1978-06-28 | 1978-06-28 | Video signal detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS554745A (en) |
-
1978
- 1978-06-28 JP JP7741178A patent/JPS554745A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6238906B2 (en) | 1987-08-20 |
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