JPS5745779A - Video signal level detection circuit - Google Patents
Video signal level detection circuitInfo
- Publication number
- JPS5745779A JPS5745779A JP55121130A JP12113080A JPS5745779A JP S5745779 A JPS5745779 A JP S5745779A JP 55121130 A JP55121130 A JP 55121130A JP 12113080 A JP12113080 A JP 12113080A JP S5745779 A JPS5745779 A JP S5745779A
- Authority
- JP
- Japan
- Prior art keywords
- peak value
- input
- average value
- power supply
- 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
- 238000001514 detection method Methods 0.000 title abstract 2
- 239000003990 capacitor Substances 0.000 abstract 1
- 230000008878 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction 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
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Picture Signal Circuits (AREA)
Abstract
PURPOSE:To give the degree of freedom for the combination of a peak value form and average value form, by independently setting the peak value and the average value level, through the input of an input signal to a level detection circuit, respective voltage comparators which detect average value and peak value element. CONSTITUTION:A video signal having a blanking period of black level and pulse waveform of white level is inputted from an input terminal 1, and the signal is applied to the 1st and 2nd voltage comparators 6, 7 via a coupling capacitor 3. The input signal is compared at the comparator 6 with a comparison reference potential V0-V1 between the 1st comparison reference potential use power supply 8 and a bias power supply 5, and an output is developed when the average value of the input waveform reaches the V1. The input signal is compared at the comparator 7 with a comparison reference potential V0+V2 between the 2nd comparison reference potential use power supply 9 and the power supply 5, and an output is produced when a voltage subtracting the average value from the peak value of the input waveform reaches the V2, to independently set the peak value and the average level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55121130A JPS5745779A (en) | 1980-09-03 | 1980-09-03 | Video signal level detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55121130A JPS5745779A (en) | 1980-09-03 | 1980-09-03 | Video signal level detection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5745779A true JPS5745779A (en) | 1982-03-15 |
| JPH0153547B2 JPH0153547B2 (en) | 1989-11-14 |
Family
ID=14803611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55121130A Granted JPS5745779A (en) | 1980-09-03 | 1980-09-03 | Video signal level detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5745779A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03250978A (en) * | 1990-02-28 | 1991-11-08 | Victor Co Of Japan Ltd | Video signal level controller |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51114015A (en) * | 1975-04-01 | 1976-10-07 | Nippon Hoso Kyokai <Nhk> | Feedback clamp circuit |
-
1980
- 1980-09-03 JP JP55121130A patent/JPS5745779A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51114015A (en) * | 1975-04-01 | 1976-10-07 | Nippon Hoso Kyokai <Nhk> | Feedback clamp circuit |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03250978A (en) * | 1990-02-28 | 1991-11-08 | Victor Co Of Japan Ltd | Video signal level controller |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0153547B2 (en) | 1989-11-14 |
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