公开(公告)号：US07400362B1

公开(公告)日：2008-07-15

申请号：US11015756

申请日：2004-12-16

申请人： Daniel Gudmundson ,  Shyam Somayajula ,  Ahsan Habib Chowdhury ,  James A. Antone ,  Rahul Singh

发明人： Daniel Gudmundson ,  Shyam Somayajula ,  Ahsan Habib Chowdhury ,  James A. Antone ,  Rahul Singh

IPC分类号： H04N7/01 ,  G05F1/40

CPC分类号： H04N5/21

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。

公开(公告)号：US07355652B2

公开(公告)日：2008-04-08

申请号：US10964556

申请日：2004-10-13

申请人： Daniel Gudmondson ,  John L. Melanson ,  Rahul Singh ,  Ahsan Habib Chowdhury

发明人： Daniel Gudmondson ,  John L. Melanson ,  Rahul Singh ,  Ahsan Habib Chowdhury

IPC分类号： H03L7/00

CPC分类号： H03L7/06 ,  H03L7/0991 ,  H03L2207/50 ,  H04L7/005 ,  H04L7/0331 ,  H04N5/126

摘要： A video decoder in which the video source clock is generated entirely in the digital domain is disclosed herein. By creating a virtual version of the source clock in a numeric oscillator, the amount of noise in the system is substantially reduced. Furthermore, by transferring the digitized video signal, sampled with an asynchronous crystal clock, into the source clock domain, the accuracy of the brightness (amplitude) and color (phase) information can be greatly enhanced.

摘要翻译： 本文公开了视频源时钟完全在数字域中生成的视频解码器。 通过在数字振荡器中创建源时钟的虚拟版本，系统中的噪声量显着降低。 此外，通过将用异步晶体时钟采样的数字化视频信号传送到源时钟域，可以大大提高亮度（幅度）和颜色（相位）信息的精度。

公开(公告)号：US07339628B2

公开(公告)日：2008-03-04

申请号：US10964547

申请日：2004-10-13

申请人： Daniel Gudmondson ,  John L. Melanson ,  Rahul Singh ,  James A. Antone ,  Ahsan Habib Chowdhury ,  Krishnan Subramoniam

发明人： Daniel Gudmondson ,  John L. Melanson ,  Rahul Singh ,  James A. Antone ,  Ahsan Habib Chowdhury ,  Krishnan Subramoniam

IPC分类号： H03M1/12

CPC分类号： H04N5/4401 ,  H04N5/602 ,  H04N5/76 ,  H04N5/781 ,  H04N9/8042 ,  H04N11/20 ,  H04N21/4147 ,  H04N21/4305

摘要： Video decoder systems in which both the analog-to-digital converter and the composite decoder are driven by the stable sample clock, such as a crystal source. The outputs of the composite decoder are provided to a source rate converter, having an output that is provided to a digital output formatter. The digital output formatter is driven by the output clock, which may be locked to the source clock if desired. The output clock is developed by a clock generator which may be one of several different types, including a fractional N synthesizer, a direct digital synthesizer or a puncture clock.

摘要翻译： 视频解码器系统，其中模数转换器和复合解码器均由诸如晶体源的稳定采样时钟驱动。 复合解码器的输出被提供给源速率转换器，其具有提供给数字输出格式器的输出。 数字输出格式化器由输出时钟驱动，如果需要，可以将其锁定到源时钟。 输出时钟由时钟发生器开发，时钟发生器可以是几种不同类型之一，包括分数N合成器，直接数字合成器或穿孔时钟。