公开(公告)号：US20030108332A1

公开(公告)日：2003-06-12

申请号：US10291207

申请日：2002-11-08

Applicant: STMICROELECTRONICS S.A.

Inventor： Diego Coste ,  Herve Maffini

IPC: H04N005/95 ,  H04N005/08

CPC classification number: H04N5/05 ,  H04N5/126

Abstract: A system and method for detecting the nature of a video signal using a video synchronization circuit including a phase locked loop having a time constant is disclosed. The method includes calculating a horizontal phase difference between a predetermined first line of the video signal and a predetermined second line of the video signal, the predetermined first line and the predetermined second line bracketing a change of frame. If the horizontal phase difference is greater than a threshold, the video signal is deemed to be a video recorder signal. The method further includes adjusting the time constant of the phase locked loop of the video synchronization circuit according to the nature of the video signal, as determined in the calculating step.

Abstract translation: 公开了一种使用包括具有时间常数的锁相环的视频同步电路来检测视频信号的性质的系统和方法。 该方法包括计算视频信号的预定第一行和视频信号的预定第二行之间的水平相位差，预定第一行和预定第二行包围帧的改变。 如果水平相位差大于阈值，则视频信号被认为是录像机信号。 该方法还包括根据在计算步骤中确定的视频信号的性质来调整视频同步电路的锁相环的时间常数。

公开(公告)号：US20030081148A1

公开(公告)日：2003-05-01

申请号：US10283029

申请日：2002-10-29

Applicant: STMicroelectronics S.A.

Inventor： Diego Coste ,  Ilija Materic ,  Francois Besson ,  Herve Maffini

IPC: H04N005/08

CPC classification number: H04N5/10

Abstract: Successive values of a horizontal phase of a video signal are determined a predetermined integer number of video lines after the successive occurrences of vertical synchronization pulses. The successive values of a parity bit are updated according to the successive values of the horizontal phase. Indications on the parity of the fields are provided from the successive values of the parity bit.

Abstract translation: 在连续出现的垂直同步脉冲之后，视频信号的水平相位的连续值被确定为预定的整数个视频行。 根据水平相位的连续值更新奇偶校验位的连续值。 字段奇偶校验的指示是从奇偶校验位的连续值提供的。