JPS62164464U - - Google Patents
Info
- Publication number
- JPS62164464U JPS62164464U JP1986053208U JP5320886U JPS62164464U JP S62164464 U JPS62164464 U JP S62164464U JP 1986053208 U JP1986053208 U JP 1986053208U JP 5320886 U JP5320886 U JP 5320886U JP S62164464 U JPS62164464 U JP S62164464U
- Authority
- JP
- Japan
- Prior art keywords
- agc
- processing means
- input
- signal processing
- video signal
- 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.)
- Granted
Links
- 239000003990 capacitor Substances 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
Landscapes
- Television Receiver Circuits (AREA)
Description
第１図は本考案のＡＧＣ回路、第２図は一般に
用いられるＡＧＣ回路のブロツク図を示す。
７…ビデオ信号処理用ＩＣ、８…ＡＧＣ増幅器
、９…Ｅ―Ｅ増幅器、１０…ＡＧＣ検波器、１１
…ビデオ入力端子、１２…ビデオ出力端子、１３
…ＡＧＣ検波端子、１４…入力切換用ＩＣ、１５
…チユーナ入力端子、１６…外部入力端子、１９
…入力切換用ＩＣ、２０…充放電コンデンサ、２
１…直列コンデンサ、２２…スイツチングダイオ
ード、２３…切換スイツチ、２４…直流電源。
FIG. 1 shows a block diagram of an AGC circuit according to the present invention, and FIG. 2 shows a block diagram of a commonly used AGC circuit. 7...Video signal processing IC, 8...AGC amplifier, 9...EE amplifier, 10...AGC detector, 11
...Video input terminal, 12...Video output terminal, 13
...AGC detection terminal, 14...Input switching IC, 15
...Tuner input terminal, 16...External input terminal, 19
...Input switching IC, 20...Charge/discharge capacitor, 2
1... Series capacitor, 22... Switching diode, 23... Changeover switch, 24... DC power supply.
Claims (1)
を備えたビデオ信号処理手段と、チユーナ信号を
加えるチユーナ入力端子及び外部入力端子と前記
ビデオ信号処理手段との間に接続された入力切換
用のスイツチング素子と、前記ＡＧＣ検波器に接
続された充放電コンデンサと、前記スイツチング
素子の制御端子及び前記コンデンサと直流電源と
の間に接続された入力切換スイツチとより成り、
前記ビデオ信号処理手段の入力端が前記切換スイ
ツチの切換えにより無信号状態から有信号状態に
切換わつた際に前記ＡＧＣ増幅器が最大利得状態
になるのを防止することを特徴としたＡＧＣ回路
。 Video signal processing means including an AGC amplifier, an EE amplifier, and an AGC detector, a tuner input terminal to which a tuner signal is added, a switching element for input switching connected between an external input terminal and the video signal processing means. , a charge/discharge capacitor connected to the AGC detector, a control terminal of the switching element, and an input changeover switch connected between the capacitor and a DC power supply,
The AGC circuit is characterized in that the AGC amplifier is prevented from entering the maximum gain state when the input end of the video signal processing means is switched from a no-signal state to a signal state by switching the changeover switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986053208U JPH062372Y2 (en) | 1986-04-09 | 1986-04-09 | AGC circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1986053208U JPH062372Y2 (en) | 1986-04-09 | 1986-04-09 | AGC circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62164464U true JPS62164464U (en) | 1987-10-19 |
| JPH062372Y2 JPH062372Y2 (en) | 1994-01-19 |
Family
ID=30879057
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1986053208U Expired - Lifetime JPH062372Y2 (en) | 1986-04-09 | 1986-04-09 | AGC circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH062372Y2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4940803A (en) * | 1972-08-25 | 1974-04-17 | ||
| JPS58139773U (en) * | 1982-03-15 | 1983-09-20 | シャープ株式会社 | Signal switching device in television receivers |
-
1986
- 1986-04-09 JP JP1986053208U patent/JPH062372Y2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS4940803A (en) * | 1972-08-25 | 1974-04-17 | ||
| JPS58139773U (en) * | 1982-03-15 | 1983-09-20 | シャープ株式会社 | Signal switching device in television receivers |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH062372Y2 (en) | 1994-01-19 |
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