適応形リンギング抑制装置

Adaptive ringing controller

Abstract

(57)【要約】 【目的】 入力信号の通過帯域のスペクトルをできるだ け減衰させず、精細度を保ちつつ、リンギングの発生を 抑制することができるようにする。 【構成】 リンギングの発生個所を検出するリンギング 検出回路3と、リンギング抑制回路2とを備え、リンギ ング検出回路3の検出結果にもとづいて、リンギング抑 制回路2の抑制量を制御する適応形リンギング抑制装置 において、リンギング抑制回路2として、入力信号の振 幅に応じて周波数特性が変化する振幅非線形特性のもの を使用する。
PURPOSE:To obtain the suppressing effect of a ringing by making a ringing control means to be non-linear, and to avoid the problem of the blurring of a boundary, or the thickness of a line. CONSTITUTION:In an adaptive ringing controller which is equipped with a ringing detecting circuit 3 which detects the part of the generation of a ringing, and a ringing control circuit 2, and which controls the suppressing amount of the ringing suppressing circuit 2 based on the detected result of the ringing detecting circuit 3, the circuit of an amplitude non-linear characteristic whose frequency characteristic is changed according the amplitude of an input signal is used as the ringing control circuit 2. Thus, when the ringing suppressing amount of the ringing detecting circuit 3 is large, the frequency characteristic which is flat or almost flat is obtained corresponding to the input signal whose amplitude is large, and the frequency characteristic of a smooth filter characteristic is obtained corresponding to the input signal whose amplitude is small. Also, when the ringing amount is small, the frequency characteristic which is flat or almost flat is obtained regardless of the size of the amplitude of the input signal.

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Patent Citations (1)

    Publication numberPublication dateAssigneeTitle
    JP-H02205176-AAugust 15, 1990Hitachi LtdRinging compensation circuit

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Cited By (7)

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    JP-2006115268-AApril 27, 2006Matsushita Electric Ind Co Ltd, 松下電器産業株式会社ブロックノイズ低減装置および画像表示装置
    JP-H0730777-AJanuary 31, 1995Nec Corp, 日本電気株式会社Ringing suppression circuit
    US-2014362288-A1December 11, 2014Stmicroelectronics Asia Pacific Pte., Ltd.System and process for image rescaling using adaptive interpolation kernal with sharpness and de-ringing control
    US-5940536-AAugust 17, 1999Matsushita Electric Industrial Co., Ltd.Ringing detector and filter
    US-8300707-B2October 30, 2012Panasonic CorporationBlock noise reduction device and image display device
    US-9276472-B2March 01, 2016Nlt Technologies, Ltd.DC/DC converter and display device including the same
    US-9390469-B2July 12, 2016Stmicroelectronics Asia Pacific Pte. Ltd.System and process for image rescaling using adaptive interpolation kernal with sharpness and de-ringing control