JPS5465013A - Video recorder-reproducer - Google Patents
Video recorder-reproducerInfo
- Publication number
- JPS5465013A JPS5465013A JP13072077A JP13072077A JPS5465013A JP S5465013 A JPS5465013 A JP S5465013A JP 13072077 A JP13072077 A JP 13072077A JP 13072077 A JP13072077 A JP 13072077A JP S5465013 A JPS5465013 A JP S5465013A
- Authority
- JP
- Japan
- Prior art keywords
- levels
- video signal
- amplifier
- level
- changes according
- 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
Landscapes
- Television Signal Processing For Recording (AREA)
Abstract
PURPOSE: To improve the S/N of the luminance level where noise is most conspicuous by providing a circuit whose gain changes according to the luminance levels of video.
CONSTITUTION: Input video signal 20 enters an amplifier 23 whose gain changes according to DC levels, by which the video signal 27 having S curve characteristics may be obtained. When the S curve characterisitc video signal 30 is inputted, it becomes video signal 32, which further enters an amplifier 33 whose gain changes according to DC levels. With this amplifier 33, the levels of the changing gains are high level 34a and low level 34b, and if the polarities of diodes 35, 36 and voltages are so selected that the gain of the amplifier 33 is small between both of these levels and that the gain increases at a level higher than 34a and a level lower than 34b, then the linear video signal 37 may be obtained.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13072077A JPS5465013A (en) | 1977-11-02 | 1977-11-02 | Video recorder-reproducer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13072077A JPS5465013A (en) | 1977-11-02 | 1977-11-02 | Video recorder-reproducer |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5465013A true JPS5465013A (en) | 1979-05-25 |
Family
ID=15041007
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13072077A Pending JPS5465013A (en) | 1977-11-02 | 1977-11-02 | Video recorder-reproducer |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5465013A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5760784A (en) * | 1980-09-27 | 1982-04-12 | Sony Corp | Recording and reproducing circuit for video signal |
-
1977
- 1977-11-02 JP JP13072077A patent/JPS5465013A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5760784A (en) * | 1980-09-27 | 1982-04-12 | Sony Corp | Recording and reproducing circuit for video signal |
JPH0342035B2 (en) * | 1980-09-27 | 1991-06-25 |
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