JPH0270583U - - Google Patents
Info
- Publication number
- JPH0270583U JPH0270583U JP14923688U JP14923688U JPH0270583U JP H0270583 U JPH0270583 U JP H0270583U JP 14923688 U JP14923688 U JP 14923688U JP 14923688 U JP14923688 U JP 14923688U JP H0270583 U JPH0270583 U JP H0270583U
- Authority
- JP
- Japan
- Prior art keywords
- switching signal
- synchronous detectors
- signal generation
- pair
- intermediate frequency
- 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 5
- 230000001360 synchronised effect Effects 0.000 claims description 5
- 230000010355 oscillation Effects 0.000 claims description 2
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims 4
- 238000010586 diagram Methods 0.000 description 3
Description
第１図は本考案の映像検波装置の概略ブロツク
線図、第２図及び第３図は従来の映像検波装置の
概略ブロツク線図、第４図は第２図に示す映像検
波装置の動作を説明するための各部の信号波形図
である。
１，２……同期検波器、３……加算器、４……
共振回路、５……リミツタ回路、６……入力端子
、７……位相比較回路、８……電圧制御発振回路
、９……切換スイツチ部。
FIG. 1 is a schematic block diagram of the video detection device of the present invention, FIGS. 2 and 3 are schematic block diagrams of the conventional video detection device, and FIG. 4 shows the operation of the video detection device shown in FIG. It is a signal waveform diagram of each part for explanation. 1, 2...Synchronous detector, 3...Adder, 4...
Resonance circuit, 5... Limiter circuit, 6... Input terminal, 7... Phase comparison circuit, 8... Voltage controlled oscillation circuit, 9... Changeover switch section.
Claims (1)
ＡＭ変調された映像中間周波信号を入力すると共
に、これら同期検波器の出力を加算することによ
り映像信号を得るようになされた映像検波装置に
おいて、 共振回路及びリミツタ回路からなる第１スイツ
チング信号作成部と、位相比較回路及び電圧制御
発振回路からなるＰＬＬ方式の第２スイツチング
信号作成部とを備え、これら第１及び第２スイツ
チング信号作成部のそれぞれの入力には、ＡＭ変
調された前記映像中間周波信号が与えられると共
に、その各出力は、切換スイツチ部を介すること
によつて、チヤンネル切換後の一定期間は前記第
１スイツチング信号作成部からの出力が、その他
の期間は前記第２スイツチング信号作成部からの
出力が、前記一対の同期検波器のそれぞれに与え
られるようになされたことを特徴とする映像検波
装置。[Claims for Utility Model Registration] A video signal is obtained by inputting an AM-modulated video intermediate frequency signal to each of a pair of parallel-connected synchronous detectors and adding the outputs of these synchronous detectors. This video detection device includes a first switching signal generation section consisting of a resonant circuit and a limiter circuit, and a PLL type second switching signal generation section consisting of a phase comparator circuit and a voltage controlled oscillation circuit. The AM-modulated video intermediate frequency signal is given to each input of the two switching signal generating sections, and each output is sent to the above-mentioned intermediate frequency signal for a certain period of time after channel switching by passing through a changeover switch section. 1. An image detection device characterized in that an output from one switching signal generation unit is applied to each of the pair of synchronous detectors during other periods, and an output from the second switching signal generation unit is applied to each of the pair of synchronous detectors during other periods.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14923688U JPH0270583U (en) | 1988-11-15 | 1988-11-15 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14923688U JPH0270583U (en) | 1988-11-15 | 1988-11-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0270583U true JPH0270583U (en) | 1990-05-29 |
Family
ID=31421283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14923688U Pending JPH0270583U (en) | 1988-11-15 | 1988-11-15 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0270583U (en) |
-
1988
- 1988-11-15 JP JP14923688U patent/JPH0270583U/ja active Pending
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