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Display synchronization method and video display terminal

A technology for video display and display synchronization. It is used in image communication, selective content distribution, electrical components, etc., and can solve problems such as inability to display video data synchronously and different clock frequencies.

Active Publication Date: 2018-06-29
HANGZHOU HIKVISION DIGITAL TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is easy to understand that even if the nominal frequency of the voltage-controlled frequency generating devices used by each video display terminal is the same, due to the influence of factory precision and other factors, the actual output frequency of each voltage-controlled frequency generating device will still have certain differences. Correspondingly, the clock frequency of each video display terminal is also different, and each video display terminal cannot synchronously display the received video data

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  • Display synchronization method and video display terminal
  • Display synchronization method and video display terminal
  • Display synchronization method and video display terminal

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Embodiment Construction

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0024] In order to solve the problems existing in the prior art, an embodiment of the present invention provides a display synchronization method and a video display terminal.

[0025] A method for synchronizing display and display provided by an embodiment of the present invention will firstly be described below.

[0026] It should be noted that, the display synchronization method provided by the embodiment of the present invention can be applied to slave vid...

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Abstract

The embodiment of the invention provides a display synchronization method and a video display terminal. The method comprises the following steps: receiving first frequency identification information;calculating a difference value between the first and second frequency identification information; determining a current target difference value based on S difference values once every S difference values are calculated; performing Kalman filtering on the current target difference value based on a stored filtering parameter group corresponding to the current target difference value so as to filterGaussian noise in the target difference value to obtain a current target difference value subjected to the filtering and a filtering parameter group corresponding to the next target difference value;storing the filtering parameter group corresponding to the next target difference value, and determining a corresponding target voltage according to the calibrated target difference value; and adjusting the own actual output frequency according to the determined target voltage. By adoption of the scheme, the clock frequency of video display terminals can be quickly adjusted to be consistent with that of a main video display terminal, so that the video display terminals can synchronously display the received video data.

Description

technical field [0001] The present invention relates to the technical field of video display, in particular to a display synchronization method and a video display terminal. Background technique [0002] In the field of video display technology, when video data from a front-end video source passes through a switch, the video data is often distributed to multiple video display terminals. It is desirable that the clock frequency of multiple video display terminals is the same, so as to ensure that each video display terminal can display the received video data synchronously. Generally speaking, the clock frequency of each video display terminal is generated based on its internal voltage-controlled frequency generating device. It is easy to understand that even if the nominal frequency of the voltage-controlled frequency generating devices used by each video display terminal is the same, due to the influence of factory precision and other factors, the actual output frequency o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N21/43H04N21/436
CPCH04N21/4302H04N21/4305H04N21/436
Inventor 王航徐宁文雯
Owner HANGZHOU HIKVISION DIGITAL TECH
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