JPS5840979U

JPS5840979U - Image quality correction circuit

Info

Publication number: JPS5840979U
Application number: JP13408081U
Authority: JP
Inventors: 嶋野　収
Original assignee: 株式会社東芝
Priority date: 1981-09-09
Filing date: 1981-09-09
Publication date: 1983-03-17

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

[Brief explanation of the drawing]

第１図、第２図、第３図は従来の画質補正回路の異なる
例を示す回路図、第４図ａ、　　ｂは第２図の回路の動
作を説明する為の信号波形図、第５図ａ　”　ｃは第３
図の回路の動作を説明する為の信号波形図、第６図はこ
の考案に係る画質補正回路の一実施例を示す回路図、第
７図ａ〜ｅは第６図の動作を説明する為の信号波形図で
ある。１１・・・入力端子、１２〜１４・・・定電流源、１５
・・・可変抵抗器、１６・・・出力端子１、Ｑ１□〜Ｑ
２５・・・トランジスタ、Ｒ１１〜Ｒ３ｏ・・・抵Ｌ　
Ｃ１１，Ｃｌ２−・・コンデンサ、Ｄ、４．　Ｄ１□・
・・ダイオード。1, 2, and 3 are circuit diagrams showing different examples of conventional image quality correction circuits, FIGS. 4a and 4b are signal waveform diagrams for explaining the operation of the circuit in FIG. 2, and FIG. Figure a ” c is the third
FIG. 6 is a circuit diagram showing an embodiment of the image quality correction circuit according to the invention; FIGS. 7 a to e are signal waveform diagrams for explaining the operation of the circuit shown in FIG. FIG. 11... Input terminal, 12-14... Constant current source, 15
...Variable resistor, 16...Output terminal 1, Q1□~Q
25...Transistor, R11-R3o...Resistor L
C11, Cl2-... Capacitor, D, 4. D1□・
··diode.

Claims

[Scope of utility model registration request]

a first circuit means configured such that a waveform of a difference signal between an input signal and an output signal has a waveform substantially similar to a differential waveform of the input signal, and to which a luminance signal is supplied as an input signal; a second circuit means configured such that a waveform of a difference signal between the input signal and the input signal has a waveform substantially similar to a differential waveform of the input signal, and to which the output signal of the first circuit means is supplied as an input signal; a first difference signal generation means for obtaining a difference signal between the input signal and the output signal of the circuit means; a second difference signal generation means for obtaining a difference signal between the input signal and the output signal of the second circuit means; the output signal of the first circuit means;
, an adding means for adding a preshoot and an overshoot having the same amplitude and time width to the output signal of the first circuit means by appropriately adding the output signal of the second difference signal generating means; image quality correction comprising: amplitude level adjusting means capable of simultaneously changing the amplitude levels of the output signals of the first and second difference signal generating means that are added to the output signal of the first circuit means by the adding means; circuit.