Video and graphics system with video scaling

• US 20040212730A1
• Filed: 05/17/2004
• Published: 10/28/2004
• Est. Priority Date: 11/09/1998
• Status: Abandoned Application

• Current Assignee: Avago Technologies General IP PTE Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: MacInnis, Alexander G., Hsiun, Vivian, Tang, Chengfuh Jeffrey, Xie, Xiaodong
• Application Number:
  US10/847,425
• Publication Number:
  US 20040212730A1
• Time in Patent Office: Days
• US Class Current: 348/441
• CPC Class Codes: G06T 9/007 Transform coding, e.g. discrete cosine transform
• CPC Class Codes: G09G 2310/0224 Details of interlacing
• CPC Class Codes: G09G 2320/0247 Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
• CPC Class Codes: G09G 2340/02 Handling of images in compressed format, e.g. JPEG, MPEG
• CPC Class Codes: G09G 2340/0407 Resolution change, inclusive of the use of different resolutions for different screen areas
• CPC Class Codes: G09G 2340/10 Mixing of images, i.e. displayed pixel being the result of an operation, e.g. adding, on the corresponding input pixels
• CPC Class Codes: G09G 2340/125 wherein one of the images is motion video
• CPC Class Codes: G09G 2360/02 Graphics controller able to handle multiple formats, e.g. input or output formats
• CPC Class Codes: G09G 2360/121 using a cache memory
• CPC Class Codes: G09G 2360/125 using unified memory architecture [UMA]
• CPC Class Codes: G09G 2360/128 Frame memory using a Synchronous Dynamic RAM [SDRAM]
• CPC Class Codes: G09G 5/001 Arbitration of resources in a display system, e.g. control of access to frame buffer by video controller and/or main processor
• CPC Class Codes: G09G 5/02 characterised by the way in which colour is displayed details of colour display specific for CRTs G09G1/28; specific for flat matrix panels other than liquid crystal displays G09G3/2003; specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 5/024 using colour registers, e.g. to control background, foreground, surface filling G09G5/06 takes precedence
• CPC Class Codes: G09G 5/026 Control of mixing and/or overlay of colours in general G09G5/022 and G09G5/024 take precedence
• CPC Class Codes: G09G 5/06 using colour palettes, e.g. look-up tables
• CPC Class Codes: G09G 5/12 Synchronisation between the display unit and other units, e.g. other display units, video-disc players
• CPC Class Codes: G09G 5/14 Display of multiple viewports
• CPC Class Codes: G09G 5/28 for enhancement of character form, e.g. smoothing
• CPC Class Codes: G09G 5/346 for systems having a bit-mapped display memory
• CPC Class Codes: G09G 5/36 : characterised by the display of a graphic pattern, e.g. using an all-points-addressable [APA] memory
• CPC Class Codes: H04N 11/143 : Encoding means therefor H04N11/16 takes precedence
• CPC Class Codes: H04N 11/20 : Conversion of the manner in which the individual colour picture signal components are combined, e.g. conversion of colour television standards
• CPC Class Codes: H04N 21/426 : Internal components of the client ; Characteristics thereof H04N5/44 takes precedence
• CPC Class Codes: H04N 21/42653 : for processing graphics
• CPC Class Codes: H04N 21/42692 : for reading from or writing on a volatile storage medium, e.g. Random Access Memory [RAM]
• CPC Class Codes: H04N 21/4305 : Synchronising client clock from received content stream, e.g. locking decoder clock with encoder clock, extraction of the PCR packets arrangements for synchronising receiver with transmitter by comparing receiver clock with transmitter clock H04L7/0012; arrangements for synchronising receiver with transmitter wherein the receiver takes measures against momentary loss of synchronisation H04L7/0083
• CPC Class Codes: H04N 21/43074 : of additional data with content streams on the same device, e.g. of EPG data or interactive icon with a TV program
• CPC Class Codes: H04N 21/4316 : for displaying supplemental content in a region of the screen, e.g. an advertisement in a separate window
• CPC Class Codes: H04N 21/434 : Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream demultiplexing of data packets for data networks, e.g. RTP/UDP H04L65/00
• CPC Class Codes: H04N 21/4347 : Demultiplexing of several video streams
• CPC Class Codes: H04N 21/440218 : by transcoding between formats or standards, e.g. from MPEG-2 to MPEG-4 conversion of standards in analogue television systems H04N7/01
• CPC Class Codes: H04N 21/44029 : for generating different versions
• CPC Class Codes: H04N 5/14 : Picture signal circuitry for video frequency region cameras or camera modules comprising electronic image sensors, or control thereof H04N23/00
• CPC Class Codes: H04N 5/44504 : Circuit details of the additional information generator, e.g. details of the character or graphics signal generator, overlay mixing circuits
• CPC Class Codes: H04N 5/45 : Picture in picture , e.g. displaying simultaneously another television channel in a region of the screen
• CPC Class Codes: H04N 5/46 : for receiving on more than one standard at will deflecting circuits of multi-standard receivers H04N3/27
• CPC Class Codes: H04N 7/0135 : involving interpolation processes interpolation-based image scaling G06T3/4007; interpolation for video coding H04N19/587, H04N19/59
• CPC Class Codes: H04N 9/45 : Generation or recovery of colour sub-carriers
• CPC Class Codes: H04N 9/641 : Multi-purpose receivers, e.g. for auxiliary information H04N9/642 takes precedence

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.

Claims

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.