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公开(公告)号：EP1168851A3
公开(公告)日：2005-02-09
申请号：EP01305090.1
申请日：2001-06-12
CPC分类号： H04N9/72
摘要： An interface circuit 13 is provided for a display apparatus 3 such as a television. The display apparatus 3 comprises a video signal processing circuit 8 for processing a composite video signal to derive colour component signals having variable black and white levels; a linear amplifier 10 for amplifying the colour component signals; and a display device 4 such as a CRT driven by the output of the linear amplifier 10. The interface circuit 13 is provided to interface the colour component signals with a digital signal processor 14. The interface circuit 13 includes a modification circuit 22 arranged to perform a modification of voltage levels of the colour component signals and to output the modified colour component signals to the digital signal processor 14 via an A/D convertor 18. The interface circuit 13 further includes a remodification circuit 23 arranged to receive processed colour component signals supplied from the digital signal processor 14 via a D/A convertor 19 and to perform a modification of the processed colour component signals which is the inverse of the modification performed by the modification circuit 22. The modification and remodification circuits 22, 23 use calibration signals including the black and white levels of the colour component signals inserted in a predetermined period in the vertical blanking interval of the colour component signal. The interface circuit 13 reduces the resolution necessary in the A/D convertor 18.
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2.发明公开
公开(公告)号：EP1168851A2
公开(公告)日：2002-01-02
申请号：EP01305090.1
申请日：2001-06-12
IPC分类号： H04N9/64
CPC分类号： H04N9/72
摘要： An interface circuit 13 is provided for a display apparatus 3 such as a television. The display apparatus 3 comprises a video signal processing circuit 8 for processing a composite video signal to derive colour component signals having variable black and white levels; a linear amplifier 10 for amplifying the colour component signals; and a display device 4 such as a CRT driven by the output of the linear amplifier 10. The interface circuit 13 is provided to interface the colour component signals with a digital signal processor 14. The interface circuit 13 includes a modification circuit 22 arranged to perform a modification of voltage levels of the colour component signals and to output the modified colour component signals to the digital signal processor 14 via an A/D convertor 18. The interface circuit 13 further includes a remodification circuit 23 arranged to receive processed colour component signals supplied from the digital signal processor 14 via a D/A convertor 19 and to perform a modification of the processed colour component signals which is the inverse of the modification performed by the modification circuit 22. The modification and remodification circuits 22, 23 use calibration signals including the black and white levels of the colour component signals inserted in a predetermined period in the vertical blanking interval of the colour component signal. The interface circuit 13 reduces the resolution necessary in the A/D convertor 18.
摘要翻译： 为诸如电视机的显示装置3提供接口电路13。 显示装置3包括视频信号处理电路8，用于处理复合视频信号以导出具有可变的黑白电平的色分信号; 用于放大色分量信号的线性放大器10; 以及由线性放大器10的输出驱动的诸如CRT的显示装置4.接口电路13被提供以将颜色分量信号与数字信号处理器14进行接口。接口电路13包括修改电路22，其被配置为执行 修改颜色分量信号的电压电平，并经由A / D转换器18将经修改的颜色分量信号输出到数字信号处理器14.接口电路13还包括重新校正电路23，该再变换电路23被布置成接收所提供的经处理的颜色分量信号 通过D / A转换器19从数字信号处理器14输出，并对经过修改电路22执行的修改的倒数执行处理的色分量信号的修改。修改和重新修正电路22,23使用校准信号，包括 颜色分量信号的黑白电平以垂直方向的预定周期插入 彩色分量信号的消隐间隔。 接口电路13降低了A / D转换器18中所需的分辨率
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