公开(公告)号：US07176979B2

公开(公告)日：2007-02-13

申请号：US09905786

申请日：2001-07-13

申请人： Christian Willibald Böhm ,  Michael Patrick Daly ,  Kieran Heffernan

发明人： Christian Willibald Böhm ,  Michael Patrick Daly ,  Kieran Heffernan

IPC分类号： H04N5/10

CPC分类号： H04N5/10

摘要： A synchronization pulse detector includes an absolute value independent shape detector for processing samples of an input signal having a synchronization pulse and a plurality of non-synchronization pulses to determine whether such samples have a predetermined sequence. The predetermined sequence includes a first and second absolute value independent time-varying portions and a first and second absolute value independent non-time varying portions. One of the first and second absolute value independent time-varying portions having a positive slope and the other one of the first and second absolute value independent time-varying portions having a negative slope.

摘要翻译： 同步脉冲检测器包括用于处理具有同步脉冲和多个非同步脉冲的输入信号的样本的绝对值独立形状检测器，以确定这样的样本是否具有预定的序列。 预定序列包​​括第一和第二绝对值独立时变部分和第一和第二绝对值独立的非时变部分。 具有正斜率的第一和第二绝对值独立时变部分之一，第一和第二绝对值独立时变部分中的另一个具有负斜率。

公开(公告)号：US06271889B1

公开(公告)日：2001-08-07

申请号：US09262589

申请日：1999-03-04

申请人： Christian Willibald Böhm ,  Michael Patrick Daly ,  Kieran Heffernan

发明人： Christian Willibald Böhm ,  Michael Patrick Daly ,  Kieran Heffernan

IPC分类号： H04N510

CPC分类号： H04N5/10

摘要： A synchronization pulse detector for detecting a synchronization pulse within an input signal. The input signal has “level” portions (i.e., substantially non-time varying portions) and “transition” portions (i.e., substantially time varying portions). The pulse detector includes a pulse shape detector for determining each time the input signal has a sequence of a first “level” portion, followed by a first “transition” portion, followed by a second “level” portion, followed by a second “transition” portion followed by a third “level” portion, one of the first and second “transition” portions being positive and the other one of the first and second “transition” portions being negative. Each time such sequence is determined a pulse_shape detected pulse is produced. An evaluator is provided to reject invalid pulse_shape detected pulses. In one embodiment, the input signal is a video signal and the evaluator includes a time window for determining whether such shape_detected pulses are produced at a predetermined rate expected for the series of synchronization pulses. The evaluator includes a voltage window responsive to the produced shape_detected pulses and their associated values of the second “level” portions for determining whether one of such produced second “level” portions is substantially the same as or lower but not higher than the lowest DC value recorded during the time-equivalent of one line of video. The evaluator may include both the time window and the voltage window. The voltage window is mainly used to acquire an initial lock to an unknown and not yet clamped video signal.

摘要翻译： 一种用于检测输入信号内的同步脉冲的同步脉冲检测器。 输入信号具有“电平”部分（即，基本上非时变部分）和“转变”部分（即基本上时变部分）。 脉冲检测器包括脉冲形状检测器，用于每次输入信号具有第一“电平”部分的序列，随后是第一“转换”部分，随后是第二“电平”部分，随后进行第二“转换” “部分之后是第三”级“部分，第一和第二”转换“部分之一是正的，第一和第二”转换“部分中的另一个是负的。 每次确定这样的序列时，产生脉冲形状检测脉冲。 提供评估器来拒绝无效的pulse_shape检测脉冲。 在一个实施例中，输入信号是视频信号，并且评估器包括一个时间窗口，用于确定是否以针对该系列同步脉冲预期的预定速率产生这种形状检测脉冲。 评估器包括响应于产生的形状检测脉冲及其相关值的第二“电平”部分的电压窗口，用于确定这样产生的第二“电平”部分中的一个是基本上相同还是不高于最低DC值 在相当于一行视频的时间内记录。 评估器可以包括时间窗和电压窗。 电压窗口主要用于获取未知且尚未钳位的视频信号的初始锁定。