JPH0467875U - - Google Patents
Info
- Publication number
- JPH0467875U JPH0467875U JP11179690U JP11179690U JPH0467875U JP H0467875 U JPH0467875 U JP H0467875U JP 11179690 U JP11179690 U JP 11179690U JP 11179690 U JP11179690 U JP 11179690U JP H0467875 U JPH0467875 U JP H0467875U
- Authority
- JP
- Japan
- Prior art keywords
- video
- circuit
- converter
- current source
- constant current
- 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 12
- 239000003990 capacitor Substances 0.000 claims description 7
- 230000003321 amplification Effects 0.000 claims 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims 3
- 238000007599 discharging Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Television Receiver Circuits (AREA)
Description
第１図は、本考案の一実施例を示す回路図、第
２図は、従来のテレビジヨン受像機を示す回路図
、第３図イ乃至ハは、第２図の説明に供する為の
波形図、及び第４図は第１図の説明に供する為の
波形図である。
２……映像ＩＦ増幅回路、３……映像検波回路
、４……ノイズ除去回路、８……第２コンバレー
タ、９……ＡＧＣ検波用コンデンサ、１０……第
２定電流源、１２……第１定電流源、１４……第
１コンバレータ、１５……第３定電流源、１６…
…スイツチ。
Fig. 1 is a circuit diagram showing an embodiment of the present invention, Fig. 2 is a circuit diagram showing a conventional television receiver, and Fig. 3 A to C are waveforms for explaining Fig. 2. 1 and 4 are waveform diagrams for explaining FIG. 1. 2...Video IF amplifier circuit, 3...Video detection circuit, 4...Noise removal circuit, 8...Second converter, 9...AGC detection capacitor, 10...Second constant current source, 12...No. 1 constant current source, 14...first converter, 15...third constant current source, 16 ...
...Switch.
Claims (1)
する映像検波回路と、 該映像検波回路の検波出力信号中のノイズを除
去するノイズ除去回路と、 該ノイズ除去回路の出力映像信号と第１基準電
圧とを比較する第１コンバレータと、 前記映像検波回路の検波出力信号と第２基準電
圧とを比較する第２コンバレータと、 前記第１コンバレータの比較出力に応じてＡＧ
Ｃ検波用コンデンサを充電する第１の定電流源と
、 前記第１コンバレータの比較出力に応じて前記
ＡＧＣ検波用コンデンサを放電する第２の定電流
源と、 前記第２コンバレータの比較出力に応じて前記
ＡＧＣ検波用コンデンサを放電する第３の定電流
源と、 を備え、前記ＡＧＣ検波用コンデンサの充電電
圧に応じて前記映像ＩＦ増幅回路の利得を制御す
るようにしたことを特徴とするテレビジヨン受像
機。[Claims for Utility Model Registration] A video IF amplification circuit that amplifies a video IF signal, a video detection circuit that detects the output video IF signal of the video IF amplification circuit, and a video detection circuit that detects noise in the detected output signal of the video detection circuit. a first comparator that compares the output video signal of the noise removal circuit with a first reference voltage; and a second converter that compares the detected output signal of the video detection circuit with a second reference voltage. , AG according to the comparison output of the first converter.
a first constant current source that charges a C detection capacitor; a second constant current source that discharges the AGC detection capacitor according to the comparison output of the first converter; and a second constant current source that discharges the AGC detection capacitor according to the comparison output of the second converter. a third constant current source for discharging the AGC detection capacitor using the AGC detection capacitor, and controlling the gain of the video IF amplification circuit according to the charging voltage of the AGC detection capacitor. Jiyoung receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11179690U JPH0467875U (en) | 1990-10-24 | 1990-10-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11179690U JPH0467875U (en) | 1990-10-24 | 1990-10-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0467875U true JPH0467875U (en) | 1992-06-16 |
Family
ID=31859274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11179690U Pending JPH0467875U (en) | 1990-10-24 | 1990-10-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0467875U (en) |
-
1990
- 1990-10-24 JP JP11179690U patent/JPH0467875U/ja active Pending