Reduced user response time during simultaneous playback and recording for recordable DVD
View Patent ↗A method and apparatus for controlling simultaneous recording and playing back of data onto a disc medium. In response to a user generated pause-resume command, the apparatus can firstly buffer in a writing buffer a plurality of video object units to be recorded onto a disc medium. In addition, the apparatus can selectively pause the buffering of additional video object units to the writing buffer to prevent the writing buffer from overflowing. Further, the apparatus can secondly buffer these additional video object units in a navigation pack buffer. In one arrangement, the size of the cells containing the video object units can be reduced thereby reducing the capacity requirements of the navigation pack buffer. Moreover, the apparatus can reduce the bit rate of the incoming bitstream containing the video object units. Alternatively, the navigation pack buffer and the writing buffer can be logically combined to form a single data storage medium.
1. A method for controlling simultaneous playing back and recording of data onto a disc medium, the method comprising the steps of:
storing in a writing buffer video object units intended for recordation on the disc medium;
supplying navigation pack data to said writing buffer from a navigation pack buffer;
responsive to a user-generated pause-resume command, firstly buffering a plurality of video object units in said writing buffer;
recording said plurality of video object units buffered in said writing buffer onto said disc medium;
selectively pausing the buffering step to prevent a data overflow of said writing buffer; and
during the pausing step, secondly buffering additional video object units in said navigation pack buffer to prevent loss of said additional video object units.
2. The method according to claim 1 , further comprising the step of recording said plurality of additional video object units secondly buffered in said navigation pack buffer onto said disc medium.
3. The method according to claim 2 , further comprising shrinking a size of one or more cells containing said plurality of video object units thereby reducing the capacity requirements of said navigation pack buffer.
4. The method according to claim 3 , further comprising lowering a bit rate of said video object units to prevent overflow of said writing buffer or said navigation pack buffer.
5. The method according to claim 1 wherein said writing buffer and said navigation pack buffer are provided as a single data storage medium.
6. The method according to claim 5 wherein said writing buffer and said navigation pack buffer are logically combined.
7. The method according to claim 1 further comprising the steps of:
buffering said firstly buffered plurality of video object units in a writing buffer; and,
buffering said secondly buffered additional video object units in a navigation pack buffer.
8. The method according to claim 2 further comprising the steps of:
buffering said firstly buffered plurality of video object units in a writing buffer; and,
buffering said secondly buffered additional video object units in a navigation pack buffer.
9. An apparatus for simultaneous playing back and recording of data onto a disc medium, comprising:
a writing buffer for firstly buffering a plurality of video object units to be recorded onto said disc medium, wherein said writing buffer responsive to a pause-resume command firstly buffers said plurality of video objects therein, said plurality of video objects to be recorded on said disc medium;
a navigation pack buffer supplying navigation pack data to said writing buffer for buffering video object units requiring future data address information;
control circuitry for selectively pausing the transfer of additional video object units to said writing buffer to prevent overflow of said writing buffer; and
excess memory contained in said navigation pack buffer secondly buffering said additional video object units to prevent loss of said additional video object units.
10. The apparatus according to claim 9 wherein said control circuitry resumes transfer of data from said navigation pack buffer to said writing buffer after resumption of a disc writing process.
11. The apparatus according to claim 10 wherein a size of one or more cells containing said plurality of video object units is reduced thereby reducing the capacity requirements of said navigation pack buffer.
12. The apparatus according to claim 11 wherein said control circuitry lowers a bit rate of said video object units to prevent overflow of said writing buffer.
13. The apparatus according to claim 11 wherein said writing buffer and said navigation pack buffer are provided as a single data storage medium.
14. The apparatus according to claim 13 wherein said writing buffer and said navigation pack buffer are logically combined.
15. The apparatus according to claim 9 wherein said writing buffer and said navigation pack buffer are provided as a single data storage medium.
16. The apparatus according to claim 15 wherein said writing buffer and said navigation pack buffer are logically combined.