JPS63163069U - - Google Patents
Info
- Publication number
- JPS63163069U JPS63163069U JP5423787U JP5423787U JPS63163069U JP S63163069 U JPS63163069 U JP S63163069U JP 5423787 U JP5423787 U JP 5423787U JP 5423787 U JP5423787 U JP 5423787U JP S63163069 U JPS63163069 U JP S63163069U
- Authority
- JP
- Japan
- Prior art keywords
- level
- video signal
- composite video
- input
- sync chip
- 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
- 239000002131 composite material Substances 0.000 claims 2
- 238000001514 detection method Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Description
第１図は本考案の一実施例によるノイズキヤン
セル回路の構成を示す図、第２図は同実施例の動
作を説明するためのタイミングチヤート、第３図
は従来のノイズキヤンセル回路の構成を示す図、
第４図は第３図の動作を説明するためのタイミン
グチヤートである。
１１…ビデオ入力端子、１２…クランプ回路、
１３，１４…カレントミラー回路、１５…コンパ
レータ、１６，１７…オペアンプ、１８…ビデオ
出力端子。
FIG. 1 is a diagram showing the configuration of a noise canceling circuit according to an embodiment of the present invention, FIG. 2 is a timing chart for explaining the operation of the same embodiment, and FIG. 3 is a diagram showing the configuration of a conventional noise canceling circuit. figure,
FIG. 4 is a timing chart for explaining the operation of FIG. 3. 11...Video input terminal, 12...Clamp circuit,
13, 14... Current mirror circuit, 15... Comparator, 16, 17... Operational amplifier, 18... Video output terminal.
Claims (1)
ベルをクランプする手段と、上記シンク・チツプ
・レベルに対して予め設定されたレベル差以上の
入力がなされたことを検出する手段と、この手段
から検出信号が出力されている期間上記複合映像
信号を一定レベルに置換する手段とを具備したこ
とを特徴とするノイズキヤンセル回路。 means for clamping the sync chip level of the input composite video signal; means for detecting that an input is greater than a preset level difference with respect to the sync chip level; and detection from the means. A noise canceling circuit comprising means for replacing the composite video signal with a constant level while the signal is being output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5423787U JPS63163069U (en) | 1987-04-10 | 1987-04-10 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5423787U JPS63163069U (en) | 1987-04-10 | 1987-04-10 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63163069U true JPS63163069U (en) | 1988-10-25 |
Family
ID=30881042
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5423787U Pending JPS63163069U (en) | 1987-04-10 | 1987-04-10 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63163069U (en) |
-
1987
- 1987-04-10 JP JP5423787U patent/JPS63163069U/ja active Pending