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Method and device for bridging different video formats

A video and bridging technology, used in the conversion of storage devices with different read and write speeds, cathode ray tube indicators, standard conversion, etc., can solve the problems of complex and unstable display output, etc.

Inactive Publication Date: 2004-04-07
MAGIC PIXEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This causes erratic display output
[0064] As you can see, this problem is very complex, that is, to bridge the input video format to the output video format in an economical way, while providing stable display output to a certain range of output devices

Method used

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  • Method and device for bridging different video formats
  • Method and device for bridging different video formats
  • Method and device for bridging different video formats

Examples

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Embodiment Construction

[0198] A detailed description of embodiments of the present invention will be provided below with reference to the drawings. figure 1 is a basic architectural diagram of a system including a video format bridge 10 according to the present invention. The system accepts input from a video source 11 characterized by virtual video frames 12 . The video source 11 has an input pixel clock Fid and outputs the input video stream with parameters iH, iV, iHDE, iVDE for a given input pixel clock Fid and input frame rate iFR.

[0199] A reference clock is supplied from line 13 to clock generator 14 . The reference clock pulse can be supplied by a quartz crystal oscillator, a common 14.318 MHz oscillator commonly used, or can be derived from the input pixel clock pulse Fid. In this example, the clock generator is implemented with a frequency divider with six-bit precision. Therefore, the clock frequency Fod of the output video stream is equal to the reference frequency Fref multiplied b...

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Abstract

The video format bridging device has no overflow and underflow and output frame rate matched with input frame rate ensured via several technological measures. The bridging device can settle residual line problem and input and output pulse frequency variation problem, and can regulate the ratio between the input and output line numbers each frame and ratio between the input and output pixel numbers each line within the output unit size. One single IC is provided for several technological aims, including enabling or disabling some specific bridging operation. The bridging logic produces serial output video signal flow in the output frame rate matching with the input frame rate, and the output frames have at least one frame with lines having different pixels and / or one set of several frame with different line numbers.

Description

technical field [0001] This invention relates to a method for bridging video signals from one format to another; in particular, it relates to the fabrication process and structure of integrated circuits used for this purpose. Background technique [0002] There is a current trend from raster scan CRT displays to pixel based displays like liquid crystal displays LCD monitors, plasma TVs and projection TVs. Pixel-based display devices have stringent timing specifications, usually more stringent than the cathode ray tubes (CRTs) commonly used in standard television and computer monitors. [0003] Conditions that must be met for successful bridging include forcing the input frame rate (frame rate) iFR to match the output frame rate oFR, and the fact that the buffers used during bridging do not overflow or underflow condition. Furthermore, it is also desired that the buffer used for bridging can be as small as possible, thereby saving individual chip area and construction cost....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/20G09G5/00G09G5/391H04N7/01
CPCH04N7/0105H04N7/01G09G5/391G09G5/008
Inventor 陈昌伦黄晓鸣魏盟修
Owner MAGIC PIXEL
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