Method and system for implementing a video and graphics interface signaling protocol

• US 6,919,929 B1
• Filed: 03/29/2001
• Issued: 07/19/2005
• Est. Priority Date: 03/29/2001
• Status: Expired due to Fees

• Current Assignee: National Semiconductor Corporation (Texas Instruments, Inc.)
• Original Assignee: National Semiconductor Corporation (Texas Instruments, Inc.)
• Inventors: Shrivastava, Vikram, Iacobelli, Franco
• Primary Examiner(s): LEE, MICHAEL
• Application Number:
  US09/823,498
• Time in Patent Office: 1,573 Days
• Field of Search: H04/N00.9/74, 348/584, 348/589, 348/590, 348/600, 348/598, 348/564, 348/565, 348/588
• US Class Current: 348/589
• CPC Class Codes: G09G 2340/125 wherein one of the images is motion video
• CPC Class Codes: G09G 2352/00 Parallel handling of streams of display data
• 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: H04N 21/42653 for processing graphics
• 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 21/44004 involving video buffer management, e.g. video decoder buffer or video display buffer
• CPC Class Codes: H04N 21/8146 involving graphical data, e.g. 3D object, 2D graphics
• CPC Class Codes: H04N 5/04 Synchronising for television systems using pulse code modulation H04N7/56
• 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 9/641 Multi-purpose receivers, e.g. for auxiliary information H04N9/642 takes precedence

Abstract

A method and system for interfacing video and graphics data. Specifically, the present invention discloses a method and system for displaying video and graphics data of different formats and image frequencies onto the same display line. A master device that is continually streaming data of a first media type to a display at a certain image rate requests data from a source device one line at a time. The incoming line of data is sent to a FIFO buffer. A mixer associated with the master device then aligns the incoming data to the same format and image rate used for displaying the first media type. The incoming data is then displayed simultaneously on the same line with the data of the first media type. As viewed as an image, windows of video and/or graphics data are shown on a display.

Claims

1. In a multimedia system, a method of interfacing media, said method comprising the steps of:

displaying continuously a first media data type on a display having contiguous lines, said display having a line-to-line correspondence with said first media data type;

requesting from a source device a first line of data of a second media data type before a predetermined line of data of said first media data type is displayed;

receiving said first line of data into a single first-in-first-out (FIFO) buffer;

aligning said first line of data to said first media data type wherein said aligning comprises performing frame rate conversion;

mixing said first line of data with said predetermined line of data;

displaying said first line of data and said predetermined line of data concurrently on a predetermined line of said display without any interruption in the displaying of said first media data type; and

on a line by line basis repeating for a second line of data of said second media type.

2. The method as described in claim 1, comprising the further step of:

requesting on a line-by-line basis further lines of data of said second media data type, to be aligned to, mixed with, and displayed concurrently with said corresponding lines of data of said first media data type, before each of said corresponding lines of data of said first media data type are displayed.

3. The method as described in claim 1, comprising the further step of:

sending a retrace signal to said source device to indicate the beginning of an image to be shown on said display, said image to be taken from a group consisting essentially of;

a frame in the case of progressive mode; and

a field in the case of interlaced mode.

4. The method as described in claim 1, wherein said first media data type comprises video data and said second media data type comprises graphics data, said graphics data displayed in a resizable window.

5. The method as described in claim 1, wherein said first media data type comprises graphics data and said second media data type comprises video data, said video data displayed in a resizable window.

6. The method as described in claim 1, wherein said step of aligning comprises the further steps of:

matching frame rates in the case of progressive mode or field rates in the case of interlaced mode; and

converting data of said second media data type to the same format as data of said first media data type.

7. The method as described in claim 1, wherein said step of mixing comprises the further steps of:

overlaying said first line of data over said predetermined line of data; and

placing said first line of data within a window on said display.

8. The method as described in claim 1, wherein said step of mixing comprises the further steps of:

alpha blending said first line of data with said predetermined line of data; and

placing said first line of data within a window on said display.

9. In a multimedia system, a method of interfacing media types, comprising the steps of:

a) displaying continuously a first media data type on a display having contiguous lines in a progressive mode, said display having a line-to-line correspondence with said first media data type;

b) sending a retrace signal from said first device to a source device to indicate the beginning of an image to be shown on said display;

c) requesting from said source device on a line-by-line basis a line of data of a second media data type before a corresponding line of data of said first media data type is displayed, said line of data of a second media data type to be displayed in a resizable window of said display;

d) receiving said line of data of a second media data type;

e) aligning said line of data of a second media data type to said first media data type;

f) mixing said first line of data with said corresponding line of data;

g) displaying said line of data of a second media data type and said corresponding line of data of said first media data type concurrently on a predetermined line of said display without any interruption in the displaying of said first media data type; and

h) repeating steps c) through g) until said image is displayed; and

i) repeating steps a) through h).

10. The method as described in claim 9, wherein said image is to be taken from a group consisting essentially of:

a frame in the case of progressive mode; and

a field in the case of interlaced mode.

11. The method as described in claim 9, wherein said first media data type comprises video data and said second media data type comprises graphics data, said graphics data displayed in said window.

12. The method as described in claim 9, wherein said first media data type comprises graphics data and said second media data type comprises video data, said video data displayed in said window.

13. The method as described in claim 9, wherein said step of aligning comprises the further steps of:

matching frame rates in the case of progressive mode or field rates in the case of interlaced mode; and

converting data of said second media data type to the same format as data of said first media data type.

14. The method as described in claim 9, wherein said step of mixing comprises the further steps of:

overlaying said first line of data over said predetermined line of data; and

placing said first line of data within said window on said display.

15. The method as described in claim 9, wherein said step of mixing comprises the further steps of:

alpha blending said first line of data with said predetermined line of data; and

placing said first line of data within said window on said display.

16. The method as described in claim 9, wherein said display is taken from a list comprising essentially of:

SDTV;

HDTV;

VGA computer monitor;

CRTs; and

High Resolution Display.

17. A system comprising a processor, a memory unit, and a display screen wherein said memory contains instructions that when executed implement a method of interfacing media, said method comprising the steps of:

displaying continuously a first media data type on a display having contiguous lines, said display having a line-to-line correspondence with said first media data type;

requesting from a source device a first line of data of a second media data type before a predetermined line of data of said first media data type is displayed;

receiving said first line of data into a single first-in-first-out (FIFO) buffer;

aligning said first line of data to said first media data type wherein said aligning comprises performing frame rate conversion;

mixing said first line of data with said predetermined line of data;

displaying said first line of data and said predetermined line of data concurrently on a predetermined line of said display without any interruption in the displaying of said first media data type; and

on a line-by-line basis repeating for a second line of data of said second media type.

18. The method as described in claim 17, comprising the further step of:

requesting on a line-by-line basis further lines of data of said second media data type, to be aligned to, mixed with, and displayed concurrently with said corresponding lines of data of said first media data type, before each of said corresponding lines of data of said first media data type are displayed.

19. The method as described in claim 17, comprising the further step of:

sending a retrace signal to said source device to indicate the beginning of an image to be shown on said display, said image to be taken from a group consisting essentially of;

a frame in the case of progressive mode; and

a field in the case of interlaced mode.

20. The method as described in claim 17, wherein said first media data type comprises video data and said second media data type comprises graphics data, said graphics data displayed in a resizable window.

21. The method as described in claim 17, wherein said first media data type comprises graphics data and said second media data type comprises video data, said video data displayed in a resizable window.

22. The method as described in claim 17, wherein said step of aligning comprises the further steps of:

matching frame rates in the case of progressive mode or field rates in the case of interlaced mode; and

converting data of said second media data type to the same format as data of said first media data type.

23. The method as described in claim 17, wherein said step of mixing comprises the further steps of:

overlaying said first line of data over said predetermined line of data; and

placing said first line of data within a window on said display.

24. The method as described in claim 17, wherein said step of mixing comprises the further steps of:

alpha blending said first line of data with said predetermined line of data; and

placing said first line of data within a window on said display.