JPS6448981U - - Google Patents
Info
- Publication number
- JPS6448981U JPS6448981U JP1987143607U JP14360787U JPS6448981U JP S6448981 U JPS6448981 U JP S6448981U JP 1987143607 U JP1987143607 U JP 1987143607U JP 14360787 U JP14360787 U JP 14360787U JP S6448981 U JPS6448981 U JP S6448981U
- Authority
- JP
- Japan
- Prior art keywords
- signal
- detection
- outputs
- intermediate frequency
- capacitor
- 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
- 239000003990 capacitor Substances 0.000 claims description 4
- 230000003321 amplification Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 238000009499 grossing Methods 0.000 claims description 2
- 230000007423 decrease Effects 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 3
Description
第１図はこの考案のＡＧＣ回路の１実施例の結
線図、第２図ａ〜ｃは正常な映像信号、スクラン
ブル信号化された映像信号、デスクランブル用の
パルス信号でＡＭ変調された音声中間周波数信号
それぞれの波形図、第３図は従来のＡＧＣ回路の
結線図である。
１……入力端子、２……増幅部、３……検波部
、４……出力端子、６……平滑フイルタ部、Ｃ３
……コンデンサ、Ｄ１，Ｄ２……ダイオード。
Figure 1 is a wiring diagram of one embodiment of the AGC circuit of this invention, and Figures 2 a to c are a normal video signal, a scrambled video signal, and an audio intermediate AM modulated with a descrambling pulse signal. The waveform diagram of each frequency signal and FIG. 3 is a wiring diagram of a conventional AGC circuit. 1...Input terminal, 2...Amplification section, 3...Detection section, 4...Output terminal, 6...Smoothing filter section, C3
...Capacitor, D1, D2...Diode.
Claims (1)
ル用のパルス信号でＡＭ変調された音声中間周波
数信号をＡＣＣ増幅してＡＭ検波出力するＡＧＣ
回路において、 制御信号のレベルに比例した利得で前記中間周
波数信号を増幅する増幅部と、 前記増幅部の出力信号をＡＭ検波し、前記中間
周波数信号のＡＭ検波信号を出力する検波部と、 前記出力信号の振幅の増減の逆に充放電される
積分用のコンデンサを有し、前記コンデンサの充
電レベルの前記制御信号を形成して出力する平滑
フイルタ部とを備え、 かつ、前記フイルタ部に、少なくとも前記出力
信号が所定レベル以上変動して減少したときにの
み前記コンデンサの充電路をオンする充電用のし
きい値手段を設けたＡＧＣ回路。[Claim for Utility Model Registration] An AGC installed in a television receiver that amplifies an audio intermediate frequency signal that has been AM modulated with a descrambling pulse signal by ACC and outputs an AM detection signal.
The circuit includes: an amplification section that amplifies the intermediate frequency signal with a gain proportional to the level of the control signal; a detection section that performs AM detection on the output signal of the amplification section and outputs an AM detection signal of the intermediate frequency signal; a smoothing filter section that has an integrating capacitor that is charged and discharged inversely to increases and decreases in the amplitude of the output signal, and that forms and outputs the control signal for the charge level of the capacitor, and the filter section includes: An AGC circuit comprising charging threshold means for turning on the charging path of the capacitor only when the output signal fluctuates and decreases by at least a predetermined level or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987143607U JPS6448981U (en) | 1987-09-19 | 1987-09-19 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987143607U JPS6448981U (en) | 1987-09-19 | 1987-09-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6448981U true JPS6448981U (en) | 1989-03-27 |
Family
ID=31410577
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987143607U Pending JPS6448981U (en) | 1987-09-19 | 1987-09-19 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6448981U (en) |
-
1987
- 1987-09-19 JP JP1987143607U patent/JPS6448981U/ja active Pending
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