公开(公告)号：US07423697B1

公开(公告)日：2008-09-09

申请号：US11015728

申请日：2004-12-16

申请人： Daniel Gudmundson ,  Ahsan Habib Chowdury ,  James A. Antone ,  Rahul Singh

发明人： Daniel Gudmundson ,  Ahsan Habib Chowdury ,  James A. Antone ,  Rahul Singh

IPC分类号： H04N7/18

CPC分类号： H04N5/165 ,  H04N5/18

摘要： A system in which drooping of the video levels due to leakage currents and proper DC bias level is addressed by providing a charge into the video signal to offset the leakage currents and to provide DC bias. To determine the leakage current level, measurements are made measuring the voltages of the syncs and the blanking intervals. To determine the DC bias, a measurement is made of the sync. Over a series of video lines these measurements are averaged. If the average is below the desired level, a charge is provided via a current source to the incoming signal. By having the current source provide charge during each video line, droop is reduced and the proper DC bias is provided.

摘要翻译： 通过向视频信号中提供电荷来补偿泄漏电流并提供DC偏压来解决由泄漏电流和适当的DC偏置电平引起的视频电平下降的系统。 为了确定泄漏电流电平，可以测量同步电压和消隐间隔。 为了确定直流偏置，测量同步。 通过一系列视频线对这些测量进行平均。 如果平均值低于所需的电平，则通过电流源向输入信号提供电荷。 通过使电流源在每个视频行期间提供电荷，降低下降并提供适当的DC偏压。