JPS60108074U - Video intermediate frequency amplification circuit - Google Patents
Video intermediate frequency amplification circuitInfo
- Publication number
- JPS60108074U JPS60108074U JP19855783U JP19855783U JPS60108074U JP S60108074 U JPS60108074 U JP S60108074U JP 19855783 U JP19855783 U JP 19855783U JP 19855783 U JP19855783 U JP 19855783U JP S60108074 U JPS60108074 U JP S60108074U
- Authority
- JP
- Japan
- Prior art keywords
- video
- intermediate frequency
- band filter
- amplifier
- amplification circuit
- 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
- 230000003321 amplification Effects 0.000 title claims description 5
- 238000003199 nucleic acid amplification method Methods 0.000 title claims description 5
- 230000005684 electric field Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 238000010897 surface acoustic wave method Methods 0.000 description 1
Landscapes
- Television Receiver Circuits (AREA)
- Amplifiers (AREA)
- Noise Elimination (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
第１図は従来の映像中間周波増幅回路を示す回路図、第
２図は本考案の一実施例に係る映像中間周波増幅回路を
示す回路図、第３図はＡＧＣ電圧特性を示す特性図であ
る。
１・・・チューナ、４・・・弾性表面波フィルタ、４ｂ
・・・映像用出力電極部（映像用帯域フィルタ）、４Ｃ
・・・音声用出力電極部（音声用フィルタ）、６゜１０
９Ｒ４・・・負荷抵抗、８・・・映像増幅器、１２・・
・音声増幅器、２１・・・検出スイッチング手段、Ｒ１
−Ｒ３・・・抵抗、Ｑ□・・・トランジスタ、Ｑ２・・
・電界効果トランジスタ。Fig. 1 is a circuit diagram showing a conventional video intermediate frequency amplification circuit, Fig. 2 is a circuit diagram showing a video intermediate frequency amplification circuit according to an embodiment of the present invention, and Fig. 3 is a characteristic diagram showing AGC voltage characteristics. be. 1... Tuner, 4... Surface acoustic wave filter, 4b
...Video output electrode section (video bandpass filter), 4C
...Audio output electrode part (audio filter), 6°10
9R4...Load resistance, 8...Video amplifier, 12...
- Audio amplifier, 21... detection switching means, R1
-R3...Resistor, Q□...Transistor, Q2...
・Field effect transistor.
Claims (1)
力負荷抵抗を有する映像帯域フィルタおよび音声帯域フ
ィルタを挿入した映像中間周波増幅回路において、前記
映像増幅器と音声帯域フィルタとの間に接続され、前記
映像増幅器にて形成される入力電界レベルに応じた電圧
で前記音声帯域フィルタの出力負荷抵抗値を前記映像帯
域フィルタの出力負荷抵抗値に対して増減するように切
換える手段を設けたことを特徴とする映像中間周波増幅
回路。In a video intermediate frequency amplification circuit in which a video band filter and an audio band filter each having an output load resistance are inserted between a tuner and each video and audio amplifier, the video intermediate frequency amplifier circuit is connected between the video amplifier and the audio band filter, and is connected between the video amplifier and the audio band filter. The present invention is characterized by providing means for switching the output load resistance value of the audio band filter to increase or decrease with respect to the output load resistance value of the video band filter using a voltage corresponding to the input electric field level formed by the amplifier. Video intermediate frequency amplification circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19855783U JPS60108074U (en) | 1983-12-26 | 1983-12-26 | Video intermediate frequency amplification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19855783U JPS60108074U (en) | 1983-12-26 | 1983-12-26 | Video intermediate frequency amplification circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60108074U true JPS60108074U (en) | 1985-07-23 |
Family
ID=30757653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19855783U Pending JPS60108074U (en) | 1983-12-26 | 1983-12-26 | Video intermediate frequency amplification circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60108074U (en) |
-
1983
- 1983-12-26 JP JP19855783U patent/JPS60108074U/en active Pending
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