公开(公告)号：US6028586A

公开(公告)日：2000-02-22

申请号：US819922

申请日：1997-03-18

申请人： Philip Lawrence Swan ,  Edward George Callway ,  Biljana Dusan Simsic ,  Ivan Wong Yin Yang ,  David Ian James Glen

发明人： Philip Lawrence Swan ,  Edward George Callway ,  Biljana Dusan Simsic ,  Ivan Wong Yin Yang ,  David Ian James Glen

IPC分类号： G09G5/00 ,  G09G5/36

CPC分类号： G09G5/363 ,  G09G2340/0435

摘要： A method and apparatus for detecting differences between an image update rate and a display update rate and to provide a viable solution that produces minimal adverse visual effects is achieved by first detecting an image delineation from a stream of images. The image delineation is then used to determine the image update rate which is compared to the display update rate to produce a relationship between the two update rates. The relationship is then compared to a plurality of desired relationships to determine if it is sufficiently similar to one or more of the desired relationships. If it is, an image display pattern associated with the desired relationship is used. For example, if the relationship is sufficiently similar to the desired relationship of 1:1, then the image display pattern will be 1111 . . . In other words, the image display pattern would display each received image once. But, even though the relationship is sufficiently similar, the display update is adjusted, such that, over time, the relationship matches the desired relationship.

摘要翻译： 通过首先从图像流检测图像描绘来实现用于检测图像更新速率和显示更新率之间的差异并提供产生最小不利视觉效果的可行解决方案的方法和装置。 然后使用图像描绘来确定与显示更新率进行比较以产生两个更新率之间的关系的图像更新速率。 然后将该关系与多个期望的关系进行比较，以确定其是否与一个或多个期望的关系充分相似。 如果是，则使用与期望关系相关联的图像显示图案。 例如，如果关系足够类似于1：1的期望关系，则图像显示图案将为1111。 。 。 换句话说，图像显示图案将显示每个接收的图像一次。 但是，即使关系足够相似，显示更新被调整，使得随着时间的推移，关系匹配期望的关系。

公开(公告)号：US5977836A

公开(公告)日：1999-11-02

申请号：US876731

申请日：1997-06-16

申请人： Philip Lawrence Swan ,  David Ian James Glen

发明人： Philip Lawrence Swan ,  David Ian James Glen

IPC分类号： G09G3/20 ,  H03L7/18 ,  H03L7/183

CPC分类号： H03L7/18 ,  G09G3/20

摘要： A method and apparatus for controlling an output frequency of a phase locked loop is accomplished by determining a plurality of divider ratios which are based on an input frequency, parameters, and a desired output frequency. Each of the divider ratios is representative of a ratio between the output frequency and input frequency of the phase locked loop. Having determined the plurality of divider ratios, another determination is subsequently made to determine whether the plurality of divider ratios enable the phase locked loop to produce the output frequency within a given frequency tolerance, i.e., within an allowable error. The determination is based on whether changing the divider ratio from the one of the plurality of ratios to an adjacent ratio causes the output frequency to change more than the allowable error. If so, the plurality of ratios needs to be recalculated based on a change in the input frequency and/or one of the parameters. When the output frequency can be established within the allowable error (i.e., a change from one of the divider ratios to another one produced calculated output frequencies that are within the allowable error), the phase locked loop utilizes one of the plurality of ratios to establish the output frequency. The PLL may further utilize other ratios of the plurality of ratios to finely adjust the output frequency thereby effecting a change on the display update rate.

摘要翻译： 通过确定基于输入频率，参数和期望的输出频率的多个分频比来实现用于控制锁相环的输出频率的方法和装置。 每个分频比代表了锁相环的输出频率和输入频率之间的比率。 在确定了多个分频比之后，随后进行另一确定以确定多个分频比是否允许锁相环产生给定频率容差内的输出频率，即在允许误差范围内。 决定是基于将分频比从多个比率中的一个比改变为相邻比率是否使得输出频率变化大于可允许误差。 如果是这样，则需要基于输入频率的变化和/或其中一个参数来重新计算多个比率。 当输出频率可以在允许误差内建立时（即，从分频比之一到另一个产生计算出的输出频率在可允许误差之内），锁相环使用多个比率之一建立 输出频率。 PLL可以进一步利用多个比率的其他比率来精细地调整输出频率，从而实现显示更新率的改变。

公开(公告)号：US06194971B1

公开(公告)日：2001-02-27

申请号：US08840568

申请日：1997-04-21

申请人： David Ian James Glen ,  Hugh Hin-Poon Chow ,  Ray Chau ,  Philip Lawrence Swan

发明人： David Ian James Glen ,  Hugh Hin-Poon Chow ,  Ray Chau ,  Philip Lawrence Swan

IPC分类号： H03B2700

CPC分类号： H03L7/1974 ,  H03B27/00 ,  H03L7/081 ,  H03L7/0996 ,  H03L7/18

摘要： A method and apparatus for providing very small changes in the output oscillation of a controlled oscillation circuit, which may be used in a phase locked loop circuit, is accomplished by a phase-shifting controlled oscillator that includes an oscillation circuit and a selection circuit. The oscillation circuit generates a plurality of oscillations that are of approximately the same frequency and are approximately equally phase shifted from one another. The selection circuit is operably coupled to receive the plurality of oscillations and selects one of them to be the output oscillation based on a control signal. The very small change in the output oscillation occurs when the selection circuit, based on the control signal, selects another one of the oscillations to be the output oscillation. When the change happens, a single pulse is stretched by the phase difference between the “old” output oscillation and the “new” output oscillation.

摘要翻译： 用于在可锁定环路电路中使用的受控振荡电路的输出振荡提供极小变化的方法和装置由包含振荡电路和选择电路的相移控制振荡器来实现。 振荡电路产生大致相同频率并且彼此大致相等移位的多个振荡。 选择电路可操作地耦合以接收多个振荡，并且基于控制信号选择它们中的一个作为输出振荡。 当选择电路基于控制信号选择另一个振荡作为输出振荡时，产生非常小的输出振荡变化。 当发生变化时，单个脉冲被“旧”输出振荡和“新”输出振荡之间的相位差拉伸。