公开(公告)号：EP0966165B1

公开(公告)日：2006-05-17

申请号：EP99110983.6

申请日：1999-06-09

申请人： PIONEER ELECTRONIC CORPORATION

发明人： Ogawa, Shuji, c/o Pioneer Electronic Corp. ,  Kawaguchi, Hirofumi, c/o Pioneer Electronic Corp. ,  Kikuchi, Nozomu, c/o Pioneer Electronic Corp. ,  Usui, Junichi, c/o Pioneer Electronic Corp. ,  Takeda, Masayuki, c/o Pioneer Electronic Corp.

IPC分类号： H04N9/69

CPC分类号： H04N9/69 ,  G09G3/20 ,  G09G2320/0271

摘要： A video signal processing circuit in which nearly 100% of a largest possible dynamic range can be used, desired contrast is obtained, and desired brightness characteristics are obtained by an increasing in luminance of a screen. The circuit has an RGB amplifier which amplifies three primary color video signals R, G, and B by a predetermined gain and in which the gain is controlled by a gain control signal, A/D converters for converting analog three primary color video signals which are generated from the RGB amplifier into digital signals respectively, inverse gamma correcting circuits for effecting an inverse gamma correction to the three primary color digital video signals respectively, an OR circuit and a peak holding circuit for detecting peak levels of the analog three primary color signals, and a gain control signal generator for generating a gain control signal in accordance with the peak levels. When the peak levels are equal to or larger than a predetermined value, the gain control signal generator supplies the gain control signal to control the RGB amplifier so as to set the level of each of the three primary color digital video signals generated by the A/D converters at a peak value.

公开(公告)号：EP0966165A1

公开(公告)日：1999-12-22

申请号：EP99110983.6

申请日：1999-06-09

申请人： PIONEER ELECTRONIC CORPORATION

发明人： Ogawa, Shuji, c/o Pioneer Electronic Corp. ,  Kawaguchi, Hirofumi, c/o Pioneer Electronic Corp. ,  Kikuchi, Nozomu, c/o Pioneer Electronic Corp. ,  Usui, Junichi, c/o Pioneer Electronic Corp. ,  Takeda, Masayuki, c/o Pioneer Electronic Corp.

IPC分类号： H04N9/69

CPC分类号： H04N9/69 ,  G09G3/20 ,  G09G2320/0271

摘要： A video signal processing circuit in which nearly 100% of a largest possible dynamic range can be used, desired contrast is obtained, and desired brightness characteristics are obtained by an increasing in luminance of a screen. The circuit has an RGB amplifier which amplifies three primary color video signals R, G, and B by a predetermined gain and in which the gain is controlled by a gain control signal, A/D converters for converting analog three primary color video signals which are generated from the RGB amplifier into digital signals respectively, inverse gamma correcting circuits for effecting an inverse gamma correction to the three primary color digital video signals respectively, an OR circuit and a peak holding circuit for detecting peak levels of the analog three primary color signals, and a gain control signal generator for generating a gain control signal in accordance with the peak levels. When the peak levels are equal to or larger than a predetermined value, the gain control signal generator supplies the gain control signal to control the RGB amplifier so as to set the level of each of the three primary color digital video signals generated by the A/D converters at a peak value.

摘要翻译： 可以使用可能的最大动态范围的近100％的视频信号处理电路，获得期望的对比度，并且通过屏幕的亮度增加来获得期望的亮度特性。 电路具有RGB放大器，其将三原色视频信号R，G和B放大预定的增益，并且其中增益由增益控制信号控制，用于转换模拟三原色视频信号的A / D转换器 分别从RGB放大器产生的数字信号的反伽马校正电路，用于分别对三原色数字视频信号进行反伽马校正的反相伽马校正电路，用于检测模拟三原色信号的峰值电平的OR电路和峰值保持电路， 以及增益控制信号发生器，用于根据峰值电平产生增益控制信号。 当峰值电平等于或大于预定值时，增益控制信号发生器提供增益控制信号以控制RGB放大器，以便设置由A / D转换器生成的三个原色数字视频信号中的每一个的电平， D转换器处于峰值。