JPS625761U - - Google Patents
Info
- Publication number
- JPS625761U JPS625761U JP9534785U JP9534785U JPS625761U JP S625761 U JPS625761 U JP S625761U JP 9534785 U JP9534785 U JP 9534785U JP 9534785 U JP9534785 U JP 9534785U JP S625761 U JPS625761 U JP S625761U
- Authority
- JP
- Japan
- Prior art keywords
- low
- pass filter
- clamp circuit
- video signal
- during
- 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
- 230000001360 synchronised effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 1
Landscapes
- Picture Signal Circuits (AREA)
Description
第１図はこの考案の一実施例を示す回路図、第
２図は第１図の回路の信号波形図、第３図、第４
図は、第１図の回路の等価回路の例を示す図、第
５図は第３図、第４図の回路の周波数特性図、第
６図は従来のクランプ回路を示す図である。
２６……低域通過フイルタ及び制御回路、２７
，３０，３１，３３……抵抗、２８，２９……コ
ンデンサ、３２……ＦＥＴ、３５……クランプ回
路。
Fig. 1 is a circuit diagram showing an embodiment of this invention, Fig. 2 is a signal waveform diagram of the circuit of Fig. 1, Figs.
5 is a diagram showing an example of an equivalent circuit of the circuit shown in FIG. 1, FIG. 5 is a frequency characteristic diagram of the circuits shown in FIGS. 3 and 4, and FIG. 6 is a diagram showing a conventional clamp circuit. 26...Low pass filter and control circuit, 27
, 30, 31, 33...Resistor, 28, 29...Capacitor, 32...FET, 35...Clamp circuit.
Claims (1)
ルタと、この低域通過フイルタを同期期間に同期
したパルスで制御し、前記低域通過フイルタを前
記同期期間のみ遮断周波数が低くなり同期信号の
ノイズを除去し、他の期間は映像信号を通過させ
るのに充分な遮断周波数に切換える手段を具備し
たことを特徴とする映像クランプ回路。 A low-pass filter is connected to the front stage of the clamp circuit, and this low-pass filter is controlled by pulses synchronized with the synchronization period, and the cut-off frequency of the low-pass filter is lowered only during the synchronization period to reduce the noise of the synchronization signal. 1. A video clamp circuit comprising means for switching to a cutoff frequency sufficient to remove the video signal and pass the video signal during other periods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9534785U JPS625761U (en) | 1985-06-24 | 1985-06-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9534785U JPS625761U (en) | 1985-06-24 | 1985-06-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS625761U true JPS625761U (en) | 1987-01-14 |
Family
ID=30959775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9534785U Pending JPS625761U (en) | 1985-06-24 | 1985-06-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS625761U (en) |
-
1985
- 1985-06-24 JP JP9534785U patent/JPS625761U/ja active Pending
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