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1. (WO2007002771) METHOD AND SYSTEM FOR PROVIDING INSTANT REPLAY
Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters
WHAT IS CLAIMED IS:

1. A method for providing instant replay, the method comprising:
receiving a video stream and an audio stream;
playing a program in real time, wherein the program is rendered from the video and audio streams;
compressing the video stream and the audio stream using a video compression engine and an audio compression engine respectively;
storing information relating to the compressed video and audio streams and the video and audio compression engines in a sequence header;
multiplexing the compressed video and audio streams along with synchronization information to form a plurality of coded audio and video frames;
forming a plurality of media units, wherein each media unit includes at least one video frame and at least one or more corresponding audio frames, wherein each media unit includes a first video frame that is independently decodable, wherein each media unit is an independently decodable entity, and wherein the plurality of media units have a fixed duration;
storing the plurality of media units in a memory;
storing a plurality of starting addresses in a table, wherein each of the plurality of starting addresses corresponds to one of the plurality of media units;
retrieving the sequence header in response to receipt of an instant replay command;
selecting and configuring appropriate video and audio decompression engines based on the retrieved sequence header;
identifying an instant replay starting address from the table in response to receipt of the instant replay command;
retrieving one or more of the plurality of media units from the memory starting with the media unit associated with the instant replay starting address; and
demultiplexing the one or more retrieved media units into compressed video and audio data for respective delivery to the video and audio decompression engines.

2. The method of claim 1 wherein the memory is organized in a circular manner; and wherein when the memory is full, the oldest media unit stored in the memory is overwritten by the next media unit to be stored

3. The method of claim 2 wherein the table is organized in a circular manner similar to the memory; and
wherein when the oldest media unit stored in the memory is overwritten, the oldest starting address in the table is overwritten by the starting address corresponding to the next media unit to be stored in the memory.

4. The method of claim 1 wherein the number of media units to be retrieved pursuant to the instant replay command is configurable.

5. The method of claim I wherein the number of media units to be retrieved pursuant to the instant replay command depends on number of times an instant replay function key is pressed.

6. The method of claim I wherein the memory includes a dynamic random access memory.

7. The method of claim I wherein the memory includes removable media including one of a compact flash, a memory stick, a USB (universal serial bus) flash drive and a micro drive.

8. The method of claim I wherein the memory includes one of a hard disk or a semiconductor or magnetic media based randomly accessible storage device.

9. The method of claim I wherein the demultipleκed, compressed video and audio data are decompressed by the video and audio decompression engines and rendered into a portion of the program; and
wherein the portion is played back in a first display and the program is concurrently played in real time in a second display.

10. The method of claim 9 wherein the first display is a full screen and the second display is a picture-in-picture window.

1 1. The method of claim 9 wherein the portion and the program are toggled between the first and second displays.

- I •> - 12. The method of claim 1 wherein the one or more of the plurality of media units are retrieved from the memory in a linear manner.

13. The method of claim 1 wherein the video compression engine and the audio compression engine support either constant bit rate or variable bit rate.

14. The method of claim 1 wherein the fixed duration for the plurality of media units is roughly about one (1) second.

15. A method for providing instant replay, the method comprising:
receiving a compressed and multiplexed audio/video stream from a file stored in a memory;
demultiplexing the audio/video stream into a compressed audio stream and a compressed video stream;
forming a plurality of logical media units based on the compressed audio and video streams, wherein each logical media unit includes at least one video frame and at least one corresponding audio frames, wherein each logical media unit includes a first video frame that is independently decodable, wherein each logical media unit is an independently decodable entity, and wherein the plurality of logical media units have roughly the same duration;
storing timestamp information and a plurality of starting addresses in a table, wherein each of the plurality of starting addresses corresponds to one of the plurality of logical media units, and wherein the first video frame of each of the plurality of logical media units is associated with corresponding timestamp information;
forwarding the compressed audio and video streams respectively to an audio
decompression engine and a video decompression engine;
playing a program in real time, wherein the program is rendered from outputs generated respectively by the audio and video decompression engines;
identifying an instant replay starting address from the table in response to receipt of an instant replay command;
retrieving one or more of the plurality of logical media units from the memory starting with the logical media unit associated with the instant replay starting address; and demultiplexing the one or more retrieved logical media units into compressed video and audio data for respective delivery to the video and audio decompression engines.

16. The method of claim 15 wherein the number of logical media units to be retrieved pursuant to the instant replay command is configurable.

17. The method of claim 15 wherein the number of logical media units to be retrieved pursuant to the instant replay command depends on number of times an instant replay function key is pressed.

18. The method of claim 15 wherein the memory is a local or network storage device.

19. The method of claim 15 wherein the memory includes a dynamic random access memory.

20. The method of claim 15 wherein the memory includes removable media including one of a compact flash, a memory stick, a USB (universal serial bus) flash drive and a micro drive.

21. The method of claim 15 wherein the memory includes one of a hard disk or a semiconductor or magnetic media based randomly accessible storage device.

22. The method of claim 15 wherein the demultiplexed, compressed video and audio data are decompressed by the video and audio decompression engines and rendered.

23. The method of claim 15 wherein the method supports either constant bit rate or variable bit rate.

24. The method of claim 15 wherein the fixed duration for the plurality of logical media units is roughly about one (I) second