公开(公告)号：US20030081149A1

公开(公告)日：2003-05-01

申请号：US10280737

申请日：2002-10-25

Applicant: STMicroelectronics S.A.

Inventor： Diego Coste

IPC: H03L007/00 ,  H04N009/475

CPC classification number: H04N5/10 ,  H04N5/126

Abstract: A synchronization process may include detecting successive horizontal synchronization pulses of a video signal, and a phase comparison between the successive detected pulses and the successive transitions of the reference signal for controlling the oscillator of the phase-locked loop. The detection of each horizontal synchronization pulse may include sampling the video signal, low-pass filtering the sampled signal, thresholding the filtered signal for leaving pulses having a level below a threshold. The synchronization process may also include selecting, as a function of predetermined selection criteria, from among the residual pulses within an observation window centered on a transition of the reference signal for the one which corresponds to the horizontal synchronization pulse.

Abstract translation: 同步过程可以包括检测视频信号的连续水平同步脉冲，以及连续检测到的脉冲之间的相位比较以及用于控制锁相环的振荡器的参考信号的连续转换。 每个水平同步脉冲的检测可以包括对视频信号进行采样，对采样的信号进行低通滤波，对经滤波的信号进行阈值处理，以留下具有低于阈值的电平的脉冲。 同步过程还可以包括根据对应于水平同步脉冲的参考信号的转变中心的观察窗内的残留脉冲中的，作为预定选择标准的函数来选择。

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。