Graphics card for smoothing the playing of video

Abstract

A graphics card for smoothing the playing of video includes a video capture engine for receiving a digital video signal, a memory connected to the video capture engine for storing the digital video signals captured by the video capture engine, a video display engine connected to memory for receiving digital video signals stored in the memory, and a clock generator connected to the video capture engine and the video display engine for providing the same clock to the video capture engine and the video display engine so as to synchronize the signal receiving rates of the video capture engine and the video display engine.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit of U.S. Provisional Application No. 60 / 481,801, filed Dec. 16, 2003, and included herein by reference.BACKGROUND OF INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a graphics card, and more particularly, to a graphics card for smoothing the playing of video. [0004] 2. Description of the Prior Art [0005] Please refer to FIG. 1. FIG. 1 is a diagram of a graphics card 100 according to the prior art. The graphics card 100 comprises a decoder 120 having a first clock generator 122. The graphics card 100 further comprises a video capture engine 130, a video process engine 150, a memory 140, a video display engine 160, a video process clock generator 152, a second clock generator 162, a TV encoder 110, a liquid crystal display (LCD) output interface 112, a cathode ray tube (CRT) output interface 114, and a plasma display panel (PDP) output interface 116. In the graphics car...

AI Technical Summary

Benefits of technology

[0006] For instance, in the ITU-R BT601 standard, the two clock generators 122 and 162 are set to generate clocks of 27 MHz, but the second clock generator 162 generates an output clock based on a reference clock instead of based on an output clock generated by the first clock generator 122. Thus, there is likely to be a frequency difference between the clocks generated by the two generators 122 and 162. Suppose that the clock generated by the first clock generator 122 is 27 MHz while the clock generated by the second clock generator 162 is 26.9 MHz. In this case, due to the frequency difference between the two clocks, the drop-frame phenomenon will arise after a long time, that is the playing of video will gradually become less smooth. On the other hand, if the clock generated by the first clock generator 122 is 27 MHz while the clock generated by the second clock generator 162 is 27.1 MHz, the speed of playing is faster than that of video input into the video capture engine 130. Therefore, the player might have to replay the same frame when the frequency difference between the first clock generator 122 and the second clock generator 162 accumulates to the time of playing one frame. No matter whether the drop-frame or the replaying problem arises, the playing of video is not smooth.

Problems solved by technology

No matter whether the drop-frame or the replaying problem arises, the playing of video is not smooth.

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