JPH0398514U - - Google Patents
Info
- Publication number
- JPH0398514U JPH0398514U JP774790U JP774790U JPH0398514U JP H0398514 U JPH0398514 U JP H0398514U JP 774790 U JP774790 U JP 774790U JP 774790 U JP774790 U JP 774790U JP H0398514 U JPH0398514 U JP H0398514U
- Authority
- JP
- Japan
- Prior art keywords
- carrier wave
- video
- resonant circuit
- capacitor
- coil
- 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 8
- 239000003990 capacitor Substances 0.000 claims description 5
- 238000000605 extraction Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 3
Description
第１図はこの考案の一実施例による映像検波回
路の構成を示すブロツク図、第２図は同映像検波
回路の同調回路の周波数特性を示すグラフ、第３
図はこの考案の他の実施例の同調回路の構成を示
す回路図、第４図は従来の映像検波回路の構成を
示すブロツク図、第５図は同映像検波回路の同調
回路の周波数特性を示すグラフである。
３……第２中間周波増幅回路、５……振幅制限
増幅回路、６……乗算回路、１４……同調回路、
１４ａ……並列共振回路、１４ｂ……直列共振回
路、Ｌ１，Ｌ２……コイル、Ｃ１，Ｃ２……コン
デンサ。
FIG. 1 is a block diagram showing the configuration of a video detection circuit according to an embodiment of the invention, FIG. 2 is a graph showing the frequency characteristics of the tuning circuit of the video detection circuit, and FIG.
Figure 4 is a circuit diagram showing the configuration of a tuning circuit according to another embodiment of this invention, Figure 4 is a block diagram showing the configuration of a conventional video detection circuit, and Figure 5 shows the frequency characteristics of the tuning circuit of the video detection circuit. This is a graph showing. 3... Second intermediate frequency amplifier circuit, 5... Amplitude limiting amplifier circuit, 6... Multiplier circuit, 14... Tuning circuit,
14a...Parallel resonant circuit, 14b...Series resonant circuit, L1 , L2 ...Coil, C1 , C2 ...Capacitor.
Claims (1)
波信号から一定振幅の映像搬送波を抽出する抽出
手段と、前記抽出手段によつて抽出された映像搬
送波を前記映像中間周波信号に乗算する乗算手段
とを有する映像検波回路において、 前記抽出手段を構成する増幅回路の一対の平衡
出力端間に設けられ、前記映像搬送波に共振する
並列共振回路と、 前記平衡出力端間に設けられ、前記映像搬送波
と音声搬送波の中間の周波数に共振する直列共振
回路と、 を備えたことを特徴とする映像検波回路。 (2) 前記並列共振回路はコイルに第１のコンデ
ンサを並列接続して成り、前記直列共振回路は前
記コイルに第２のコンデンサを直列接続して成る
ことを特徴とする請求項１記載の映像検波回路。 (3) 前記並列共振回路は第１のコイルに第１の
コンデンサを並列接続して成り、前記直列共振回
路は第２のコイルに第２のコンデサを直列接続し
て成ることを特徴とする請求項１記載の映像検波
回路。[Claims for Utility Model Registration] (1) Extraction means for extracting a video carrier wave of a constant amplitude from a video intermediate frequency signal on which an audio intermediate frequency signal is superimposed; A video detection circuit comprising a multiplier for multiplying an intermediate frequency signal, comprising: a parallel resonant circuit provided between a pair of balanced output terminals of the amplifier circuit constituting the extraction means and resonating with the video carrier wave; and a parallel resonant circuit that resonates with the video carrier wave; A video detection circuit comprising: a series resonant circuit provided between the video carrier wave and the audio carrier wave and resonating at a frequency intermediate between the video carrier wave and the audio carrier wave. (2) The image according to claim 1, wherein the parallel resonant circuit is formed by connecting a first capacitor in parallel to a coil, and the series resonant circuit is formed by connecting a second capacitor in series to the coil. Detection circuit. (3) The parallel resonant circuit is formed by connecting a first capacitor in parallel to a first coil, and the series resonant circuit is formed by connecting a second capacitor in series to a second coil. The video detection circuit according to item 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP774790U JPH0398514U (en) | 1990-01-30 | 1990-01-30 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP774790U JPH0398514U (en) | 1990-01-30 | 1990-01-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0398514U true JPH0398514U (en) | 1991-10-14 |
Family
ID=31511399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP774790U Pending JPH0398514U (en) | 1990-01-30 | 1990-01-30 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0398514U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101477957B1 (en) * | 2014-06-03 | 2014-12-31 | 윤경일 | Apparatus for exercising trunk of human body |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5025135A (en) * | 1973-07-05 | 1975-03-17 | ||
| JPS5386116A (en) * | 1977-01-07 | 1978-07-29 | Hitachi Ltd | Video synchronous detector |
| JPS5636274A (en) * | 1979-08-29 | 1981-04-09 | Rca Corp | Television signal processor |
-
1990
- 1990-01-30 JP JP774790U patent/JPH0398514U/ja active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5025135A (en) * | 1973-07-05 | 1975-03-17 | ||
| JPS5386116A (en) * | 1977-01-07 | 1978-07-29 | Hitachi Ltd | Video synchronous detector |
| JPS5636274A (en) * | 1979-08-29 | 1981-04-09 | Rca Corp | Television signal processor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101477957B1 (en) * | 2014-06-03 | 2014-12-31 | 윤경일 | Apparatus for exercising trunk of human body |
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