JPS61189667U - - Google Patents
Info
- Publication number
- JPS61189667U JPS61189667U JP7368985U JP7368985U JPS61189667U JP S61189667 U JPS61189667 U JP S61189667U JP 7368985 U JP7368985 U JP 7368985U JP 7368985 U JP7368985 U JP 7368985U JP S61189667 U JPS61189667 U JP S61189667U
- Authority
- JP
- Japan
- Prior art keywords
- video
- section
- noise
- detection
- detection output
- 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
- 238000001514 detection method Methods 0.000 claims description 16
- 230000003321 amplification Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000003199 nucleic acid amplification method Methods 0.000 description 4
Landscapes
- Picture Signal Circuits (AREA)
Description
第１図は本考案に係る映像中間周波処理回路の
ブロツク図、第２図は第１図に示した２つの映像
増幅回路の具体的な回路図、第３図は従来の映像
中間周波処理回路のブロツク図、第４図は第３図
の動作説明用波形図、第５図は第３図に示した映
像増幅回路、黒ノイズ検出回路及びＡＧＣ検出回
路の具体的な回路図である。
３……映像検波回路、４……第１の映像増幅回
路、５……黒ノイズ検出回路、７……第２の映像
増幅回路。
Figure 1 is a block diagram of a video intermediate frequency processing circuit according to the present invention, Figure 2 is a specific circuit diagram of the two video amplification circuits shown in Figure 1, and Figure 3 is a conventional video intermediate frequency processing circuit. 4 is a waveform diagram for explaining the operation of FIG. 3, and FIG. 5 is a specific circuit diagram of the video amplification circuit, black noise detection circuit, and AGC detection circuit shown in FIG. 3. 3... Video detection circuit, 4... First video amplification circuit, 5... Black noise detection circuit, 7... Second video amplification circuit.
Claims (1)
る映像検波部と、 この映像検波部の映像検波出力中に混在したノ
イズが所定レベルを越えたときこれを検出するた
めのノイズ検出部と、 前記映像検波部の映像検波出力を増幅すると共
に前記ノイズ検出部からの検出信号を利用して前
記映像検波出力中のノイズに反転して加えノイズ
を減少した検波出力を得るための第１の映像増幅
部と、 前記映像検波部の映像検波出力を単に増幅して
出力するための第２の映像増幅部とを具備したこ
とを特徴とする映像中間周波処理回路。[Claims for Utility Model Registration] A video detection section that detects a video intermediate frequency signal to obtain a video detection output, and that detects when noise mixed in the video detection output of this video detection section exceeds a predetermined level. a noise detection section for amplifying the video detection output of the video detection section, and using the detection signal from the noise detection section, inverting and adding to the noise in the video detection output to generate a detection output with reduced noise. A video intermediate frequency processing circuit comprising: a first video amplifying section for simply amplifying and outputting the video detection output of the video detecting section;
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7368985U JPS61189667U (en) | 1985-05-17 | 1985-05-17 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7368985U JPS61189667U (en) | 1985-05-17 | 1985-05-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61189667U true JPS61189667U (en) | 1986-11-26 |
Family
ID=30613285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7368985U Pending JPS61189667U (en) | 1985-05-17 | 1985-05-17 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61189667U (en) |
-
1985
- 1985-05-17 JP JP7368985U patent/JPS61189667U/ja active Pending
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