Video and graphics system with video scaling

Abstract

A video and graphics system has a reduced memory mode in which video images are reduced in half in horizontal direction during decoding. The video and graphics system includes a video decoder for decoding MPEG-2 video data. The video images may not be downscaled in the horizontal direction when no bi-directionally predicted pictures are used. The video and graphics system may output an HDTV video while converting the HDTV video and providing as another output having an SDTV format or another HDTV format. The output having an SDTV format may be recorded using a video cassette recorder (VCR) while the HDTV video is being displayed.

What is claimed is:  
     
         1 . A system comprising: 
 an input for receiving HDTV video data;    a video decoder for decoding the HDTV video data to generate a first HDTV video having a first HDTV format; and    a scaler for converting the first HDTV video to generate a video having another format,    wherein the first HDTV video and the video having another format are provided, respectively, as first and second outputs concurrently.    
     
     
         2 . The system of  claim 1  wherein the video having another format is a second HDTV video having a second HDTV format.  
     
     
         3 . The system of  claim 1  wherein the video having another format is an SDTV video.  
     
     
         4 . The system of  claim 1  wherein the video having another format is stored in memory prior to being provided as the second output.  
     
     
         5 . The system of  claim 1  further comprising a graphics compositor for blending the first HDTV video with graphics to generate a blended HDTV video.  
     
     
         6 . The system of  claim 5  wherein the scaler converts the first HDTV video without the graphics to generate the video having another format.  
     
     
         7 . The system of  claim 5  wherein the scaler converts the blended HDTV video to generate the video having another format.  
     
     
         8 . The system of  claim 5  further comprising a multiplexer, and wherein the multiplexer is used to select between the HDTV video and the blended HDTV video to be scaled in the scaler.  
     
     
         9 . A method of providing an HDTV video and an SDTV video concurrently comprising the steps of: 
 receiving HDTV video data;    decoding the HDTV video data to generate the HDTV video; and    converting the HDTV video to generate the SDTV video,    wherein the HDTV video and the SDTV video are provided, respectively, as first and second outputs.    
     
     
         10 . The method of providing an HDTV video and an SDTV video concurrently of  claim 9  further comprising the step of storing the SDTV video in memory prior to providing it as the second output.  
     
     
         11 . The method of providing an HDTV video and an SDTV video concurrently of  claim 9  further comprising the step of blending the HDTV video with graphics to generate a blended HDTV video.  
     
     
         12 . The method of providing an HDTV video and an SDTV video concurrently of  claim 11  wherein the step of converting the HDTV video to generate the SDTV video comprises the step of converting the HDTV video without the graphics to generate the SDTV video.  
     
     
         13 . The method of providing an HDTV video and an SDTV video concurrently of  claim 11  wherein the step of converting the HDTV video to generate the SDTV video comprises the step of converting the blended HDTV video to generate the SDTV video.