JPS5711582A - Video amplifying circuit - Google Patents
Video amplifying circuitInfo
- Publication number
- JPS5711582A JPS5711582A JP8605580A JP8605580A JPS5711582A JP S5711582 A JPS5711582 A JP S5711582A JP 8605580 A JP8605580 A JP 8605580A JP 8605580 A JP8605580 A JP 8605580A JP S5711582 A JPS5711582 A JP S5711582A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- voltage
- output
- pulse
- trq1
- 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
- 230000003321 amplification Effects 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 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 1
- 238000003199 nucleic acid amplification method Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/14—Picture signal circuitry for video frequency region
- H04N5/148—Video amplifiers
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Transforming Light Signals Into Electric Signals (AREA)
- Picture Signal Circuits (AREA)
Abstract
PURPOSE:To achieve the video signal with a normal luminance level even with rapid variation of an average luminance level of objective, by holding the DC potential of pedestal of the video signal to a constant value even immediately before clamping, not to remove the DC component at demodulation and amplification. CONSTITUTION:A pulse generating circuit 10' transmits pulses corresponding to the blanking period of a pulse amplitude modulation PAM signal, and a speed-up circuit 23 make conductive a transistor TRQ1 of a sample hold circuit 22 in response to this pulse. Through the conduction of this TRQ1, the output of a DC voltage level conversion circuit 20 is sampled and stored in a capacitor C1. This stored voltage is applied to an error voltage detecting circuit 21 and compared with the reference voltage by a variable resistor VR. Thus, the circuit 21 gives the output difference to the circuit 20 to control the output at a terminal 31 of the circuit 20. Thus, the DC voltage level of a PAM signal applied to an LPF8 can be kept constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8605580A JPS5711582A (en) | 1980-06-25 | 1980-06-25 | Video amplifying circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8605580A JPS5711582A (en) | 1980-06-25 | 1980-06-25 | Video amplifying circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5711582A true JPS5711582A (en) | 1982-01-21 |
Family
ID=13875996
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8605580A Pending JPS5711582A (en) | 1980-06-25 | 1980-06-25 | Video amplifying circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5711582A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58153411A (en) * | 1982-02-19 | 1983-09-12 | エヌ・ベー・フイリツプス・フルーイランペンフアブリケン | Preamplifier |
-
1980
- 1980-06-25 JP JP8605580A patent/JPS5711582A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58153411A (en) * | 1982-02-19 | 1983-09-12 | エヌ・ベー・フイリツプス・フルーイランペンフアブリケン | Preamplifier |
| JPH0552706B2 (en) * | 1982-02-19 | 1993-08-06 | Philips Nv |
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