Pulse or digital communications – Bandwidth reduction or expansion – Television or motion video signal
Reexamination Certificate
1999-02-18
2001-05-29
Le, Vu (Department: 2613)
Pulse or digital communications
Bandwidth reduction or expansion
Television or motion video signal
Reexamination Certificate
active
06240136
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a method of providing an access point into a stream of interframe-coded video data, and to an apparatus for carrying out the method.
In service-on-demand systems, real-time video data are encoded in a server and movie video data are encoded and stored in a video server in order to be transmitted to a customer on demand. The real-time video data and the movie video data are organized in frames which, strung together, give, for example, a live broadcast transmission and a video, respectively.
Because of the limited transmission capacity of the transmission medium, e.g., a broadband cable, and particularly of the cables in the access network, a compression of the real-time/movie video data is performed in the server/video server by interframe coding. To accomplish this, instead of the original frames, only the differences of the data of successive frames are encoded. A disadvantage of the transmission of interframe-coded video data is that no access can take place in a continuous video data stream, since this would require knowledge of the preceding frame.
From DE 38 31 277 A1 it is known to insert, from time to time, intraframe-coded video data into the interframe-coded video data stream. Intraframe coding utilizes the correlation of the video data within a single frame. Thus, intraframe-coded frames can be used as access points, since no information on preceding frames is necessary for these points. The bit rate of intraframe-coded video data, however, is substantially higher than the bit rate of interframe-coded video data. A disadvantage of this method is therefore that increased transmission capacity is needed to transmit a video.
SUMMARY OF THE INVENTION
It is an object of the invention to provide a method of enabling access to a video data stream which is formed exclusively from interframe-coded video data except for the starting frame, and to an apparatus for carrying out this method.
This object is attained by a method as claimed in claim
1
and by an apparatus as claimed in claim
3
.
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Alcatel
Le Vu
Sughrue Mion Zinn Macpeak & Seas, PLLC
LandOfFree
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