JPS63200968U

JPS63200968U -

Info

Publication number: JPS63200968U
Application number: JP9211287U
Authority: JP
Priority date: 1987-06-17
Filing date: 1987-06-17
Publication date: 1988-12-23

Description

[Brief explanation of the drawing]

第１図は本考案になる画質調整回路の一実施例
を示す回路図、第２図はその一実施例を備えたビ
デオカメラのシステムブロツク図、第３図は従来
のアパーチヤ補償を行う画質調整回路の回路図で
ある。１……入力端子、２……出力端子、３……トリ
ガ信号入力端子、４……定電圧電源、５……撮像
素子、６……プロセス回路、７……画質調整回路
、８……色差信号回路、９……エンコーダ、１０
……ビデオ信号出力回路、１１……磁気記録再生
装置（ＶＴＲ）、１２……モニタ用テレビジヨン
装置（モニタＴＶ）、１３……トリガ信号発生器
、Ｃ_１，Ｃ_２……コンデンサ、Ｄ_１……ダイオー
ド、Ｌ_１……コイル、Ｑ_１〜Ｑ_４……ＮＰＮトラ
ンジスタ、Ｒ_１〜Ｒ_６……抵抗。 Fig. 1 is a circuit diagram showing an embodiment of the image quality adjustment circuit according to the present invention, Fig. 2 is a system block diagram of a video camera equipped with the embodiment, and Fig. 3 is a conventional image quality adjustment using aperture compensation. It is a circuit diagram of a circuit. 1... Input terminal, 2... Output terminal, 3... Trigger signal input terminal, 4... Constant voltage power supply, 5... Image sensor, 6... Process circuit, 7... Image quality adjustment circuit, 8... Color difference Signal circuit, 9...Encoder, 10
... Video signal output circuit, 11 ... Magnetic recording and reproducing device (VTR), 12 ... Monitor television device (monitor TV), 13 ... Trigger signal generator, C ₁ , C ₂ ... Capacitor, D ₁ ...diode, _L1 ...coil, _Q1 to _Q4 ...NPN transistor, _R1 to _R6 ...resistance.

Claims

[Claims for Utility Model Registration] The device consists of a first transistor into which a luminance signal is input and a coil is connected to the collector side, an internal resistance of this first transistor, and the coil; A first differentiation circuit that performs second differentiation, a second differentiation circuit that receives a first differentiation waveform signal from the first differentiation circuit and performs second differentiation, and a second differentiation circuit that performs second differentiation. a second transistor whose base is supplied with an emitter output signal of the first transistor; and a third transistor whose base is supplied with a trigger signal; A fourth transistor forms a differential amplification pair with the third transistor, has a collector connected to the coil, and has an emitter common to the third transistor connected to the collector of the first transistor; and a constant voltage source connected to the bases of each of the third and fourth transistors, and a differential amplifier circuit configured to control the first-order differential waveform signal in synchronization with the trigger signal. Image quality adjustment circuit.