JPS5533365A - Direct current regeneration circuit - Google Patents
Direct current regeneration circuitInfo
- Publication number
- JPS5533365A JPS5533365A JP10599378A JP10599378A JPS5533365A JP S5533365 A JPS5533365 A JP S5533365A JP 10599378 A JP10599378 A JP 10599378A JP 10599378 A JP10599378 A JP 10599378A JP S5533365 A JPS5533365 A JP S5533365A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- component
- level
- video signal
- direct current
- 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
- Picture Signal Circuits (AREA)
Abstract
PURPOSE: To realize the DC regeneration with omission of the clamping capacitor by detecting differentially the DC component of the video signal which is lost in the transmission system and then piling the DC component on the video signal for the fixed period to perform the DC regeneration.
CONSTITUTION: Video signal Si obtained through the pickup element is supplied to preamplifier 1, and comparator 2 consisting of the differential amplifier and sampling hold circuit 3 are installed in series to the output of preamplifier 1. Then level Vi of signal Si of the black period is compared with level Vs of reference signal Ss. If level Vs is set to the black level (Vs = O) of signal So whose DC is regenerated, comparison output ΔV becomes equivalent to DC component ΔV of signal So which is lost in the transmission system. This DC component ΔV is supplied to the adder circuit comprising the differential amplifier and then added to signal Si, thus obtaining DC-regenerated video signal So.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10599378A JPS5533365A (en) | 1978-08-30 | 1978-08-30 | Direct current regeneration circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP10599378A JPS5533365A (en) | 1978-08-30 | 1978-08-30 | Direct current regeneration circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5533365A true JPS5533365A (en) | 1980-03-08 |
Family
ID=14422237
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP10599378A Pending JPS5533365A (en) | 1978-08-30 | 1978-08-30 | Direct current regeneration circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5533365A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5798080U (en) * | 1980-12-05 | 1982-06-16 | ||
US4998170A (en) * | 1988-11-19 | 1991-03-05 | Sanyo Electric Co., Ltd. | Direct current restorer |
-
1978
- 1978-08-30 JP JP10599378A patent/JPS5533365A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5798080U (en) * | 1980-12-05 | 1982-06-16 | ||
US4998170A (en) * | 1988-11-19 | 1991-03-05 | Sanyo Electric Co., Ltd. | Direct current restorer |
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