JPS62171275U - - Google Patents
Info
- Publication number
- JPS62171275U JPS62171275U JP5949986U JP5949986U JPS62171275U JP S62171275 U JPS62171275 U JP S62171275U JP 5949986 U JP5949986 U JP 5949986U JP 5949986 U JP5949986 U JP 5949986U JP S62171275 U JPS62171275 U JP S62171275U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- video detection
- output signal
- television audio
- audio demodulation
- 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 3
- 238000010586 diagram Methods 0.000 description 5
- 239000000919 ceramic Substances 0.000 description 1
Landscapes
- Television Receiver Circuits (AREA)
Description
第１図は本考案になるテレビジヨン音声復調回
路の一実施例を示すブロツク系統図、第２図Ａ，
Ｂは夫々第１図図示ブロツク系統中要部の回路図
、第３図Ａ，Ｂは夫々ＡＧＣ回路の特性を示す図
、第４図は本考案の一実施例を示す回路系統図、
第５図は従来のテレビジヨン音声復調回路の一例
を示すブロツク系統図である。
５……ＡＧＣ回路、５ａ……ＡＧＣコントロー
ル端子、１２……増幅器、１３……反転増幅器、
１４……集積回路（ＩＣ）、１５……ＮＰＮトラ
ンジスタ、１６，１７……タンク回路、１８……
セラミツクフイルタ、１９……同調回路、Ｒｃ…
…抵抗。
Fig. 1 is a block system diagram showing an embodiment of the television audio demodulation circuit according to the present invention, Fig. 2A,
B is a circuit diagram of the main part of the block system shown in FIG. 1, FIGS. 3A and B are diagrams showing the characteristics of the AGC circuit, respectively, and FIG. 4 is a circuit diagram showing an embodiment of the present invention.
FIG. 5 is a block diagram showing an example of a conventional television audio demodulation circuit. 5...AGC circuit, 5a...AGC control terminal, 12...Amplifier, 13...Inverting amplifier,
14... Integrated circuit (IC), 15... NPN transistor, 16, 17... Tank circuit, 18...
Ceramic filter, 19... Tuning circuit, Rc...
…resistance.
Claims (1)
回路において、映像検波回路より一定の映像検波
出力信号を取り出すためのＡＧＣ回路のゲインを
該映像検波出力信号に基づいて該ＡＧＣ回路の入
力中間周波信号の大振幅部分で低下させるべく制
御するよう構成してなるテレビジヨン音声復調回
路。 In an intercarrier type television audio demodulation circuit, the gain of the AGC circuit for extracting a constant video detection output signal from the video detection circuit is determined based on the video detection output signal in the large amplitude portion of the input intermediate frequency signal of the AGC circuit. 1. A television audio demodulation circuit configured to perform control so as to reduce the noise.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5949986U JPS62171275U (en) | 1986-04-18 | 1986-04-18 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5949986U JPS62171275U (en) | 1986-04-18 | 1986-04-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62171275U true JPS62171275U (en) | 1987-10-30 |
Family
ID=30891045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5949986U Pending JPS62171275U (en) | 1986-04-18 | 1986-04-18 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62171275U (en) |
-
1986
- 1986-04-18 JP JP5949986U patent/JPS62171275U/ja active Pending
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