JPS619962U - AGC circuit - Google Patents

AGC circuit

Info

Publication number
JPS619962U
JPS619962U JP1984093625U JP9362584U JPS619962U JP S619962 U JPS619962 U JP S619962U JP 1984093625 U JP1984093625 U JP 1984093625U JP 9362584 U JP9362584 U JP 9362584U JP S619962 U JPS619962 U JP S619962U
Authority
JP
Japan
Prior art keywords
signal
vits
level
agc circuit
decoded
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
Application number
JP1984093625U
Other languages
Japanese (ja)
Other versions
JPH024542Y2 (en
Inventor
興二 横山
Original Assignee
日本電気ホームエレクトロニクス株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 日本電気ホームエレクトロニクス株式会社 filed Critical 日本電気ホームエレクトロニクス株式会社
Priority to JP1984093625U priority Critical patent/JPS619962U/en
Publication of JPS619962U publication Critical patent/JPS619962U/en
Application granted granted Critical
Publication of JPH024542Y2 publication Critical patent/JPH024542Y2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Television Receiver Circuits (AREA)
  • Details Of Television Systems (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (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

【図面の簡単な説明】[Brief explanation of drawings]

第１図は本考案のＡＧＣ回路のブロック図。 第２図は各部の信号の波形図で、同図ａはテレビジヨン
信号、ｂは垂直同期分離信号、Ｃはゲートパルスである
。 第３図はＶＩＴＳ信号の波形図で、同図Ａ， Ｂはテレ
ビジョン信号に含まれいる波形の例、ＣはＢに示した波
形の信号をローパスフィルタに通した後の波形である。 第４図及び第５図は本考案のＡＧＣ回路の一部分を詳細
に示した回路図である。 １・・・・・・ビデオ信号入力端子、２・・・・・・ロ
ーバスフィルタ（ＬＰＦ）、３・・・・・・垂直同期分
離回路、４・・・・・・ゲートパルス発生回路、“５・
・・・・・ゲート回路、６・・・・・・ピーク検波回路
、７・・・・・・レベル比較器、８・・・・・・基準レ
ベル設定回路、９・・・・・・デコーダ、１０・・・・
・・可変減衰器、１１・・・・・・ビデオ信号出力端子
、１２・・・・・・レヘル検出器。FIG. 1 is a block diagram of the AGC circuit of the present invention. FIG. 2 is a waveform diagram of signals at various parts, in which a is a television signal, b is a vertical synchronization separation signal, and C is a gate pulse. FIG. 3 is a waveform diagram of the VITS signal, where A and B are examples of waveforms included in a television signal, and C is a waveform after the waveform signal shown in B is passed through a low-pass filter. 4 and 5 are circuit diagrams showing in detail a portion of the AGC circuit of the present invention. 1... Video signal input terminal, 2... Low-pass filter (LPF), 3... Vertical synchronization separation circuit, 4... Gate pulse generation circuit, “5・
...Gate circuit, 6 ...Peak detection circuit, 7 ...Level comparator, 8 ...Reference level setting circuit, 9 ...Decoder , 10...
...Variable attenuator, 11...Video signal output terminal, 12...Level detector.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] テレビジョン信号の垂直帰線期間に設けられたＶＩＴＳ
信号（ＶＩＴＳ ： Ｖｅｒｔｉｃａｌ Ｉｎｔｅｒ
ｖａｌ ＴｅｓｔＳｉｇｎａｌ ）を用いるＡＧＣ回
路であって、テレビジョン信号入力の大小を判定する判
定信号として上記ＶＩＴＳ信号が備える白レベルを用い
、この白レベルをレベル比較器で受像機内の基準信号と
レベル比較を行い、この比較出力信号をデコーダでデコ
ードし、デコード出力によって信号ラインに挿入した可
変減衰器の抵抗値を制御することにより出力の信号レベ
ルを一定にすることを特徴としたＡＧＣ回路。VITS installed during the vertical retrace period of television signals
Signal (VITS: Vertical Inter
val TestSignal), which uses the white level of the VITS signal as a judgment signal for determining the magnitude of the television signal input, and compares this white level with a reference signal in the receiver using a level comparator. The AGC circuit is characterized in that the comparison output signal is decoded by a decoder, and the decoded output controls the resistance value of a variable attenuator inserted into the signal line, thereby making the output signal level constant.
JP1984093625U 1984-06-22 1984-06-22 AGC circuit Granted JPS619962U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1984093625U JPS619962U (en) 1984-06-22 1984-06-22 AGC circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1984093625U JPS619962U (en) 1984-06-22 1984-06-22 AGC circuit

Publications (2)

Publication Number Publication Date
JPS619962U true JPS619962U (en) 1986-01-21
JPH024542Y2 JPH024542Y2 (en) 1990-02-02

Family

ID=30651471

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1984093625U Granted JPS619962U (en) 1984-06-22 1984-06-22 AGC circuit

Country Status (1)

Country Link
JP (1) JPS619962U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6465986A (en) * 1987-09-04 1989-03-13 Sharp Kk Agc circuit for television signal to high definition
JP2008005486A (en) * 2006-06-23 2008-01-10 Rgb Systems Inc Method and apparatus for automatic compensation of video signal loss from transmission over conductor

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5416919A (en) * 1977-07-08 1979-02-07 Hitachi Ltd Automaic gain control circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5416919A (en) * 1977-07-08 1979-02-07 Hitachi Ltd Automaic gain control circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6465986A (en) * 1987-09-04 1989-03-13 Sharp Kk Agc circuit for television signal to high definition
JP2008005486A (en) * 2006-06-23 2008-01-10 Rgb Systems Inc Method and apparatus for automatic compensation of video signal loss from transmission over conductor

Also Published As

Publication number Publication date
JPH024542Y2 (en) 1990-02-02

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