Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Reexamination Certificate
1999-11-08
2002-10-22
Boccio, Vincent (Department: 2615)
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
C386S349000, C386S349000, C386S349000
Reexamination Certificate
active
06470135
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method and apparatus for recording received digital data streams on a recording medium and creating and recording management information pertaining to the recorded digital data streams.
2. Description of the Related Art
In conventional analog television broadcast, video signals are transmitted over the air or through cables after being AM or FM modulated. With the recent advance of digital technologies such as digital image compression or digital modulation/demodulation, standardization for digital television broadcast is in rapid progress. Based upon the Moving Picture Experts Group (MPEG) format, satellite and cable broadcast industry also moves towards digital broadcast.
Digital broadcast offers several advantages that its analog counterpart cannot provide. For example, digital broadcast is capable of providing services with far more improved video/audio quality, transmitting several different programs within a fixed bandwidth, and offering enhanced compatibility with digital communication media or digital storage median
In digital broadcast, a plurality of programs encoded based upon the MPEG format are multiplexed into a transport stream before transmitted. The transmitted transport stream is received by a set top box at the receiver and demultiplexed into a plurality of programs. If a program is chosen from among the demultiplexed programs, the chosen program is decoded by a decoder in the set top box and original audio and video signals are retrieved. The retrieved audio and video signals can be presented by an A/V output apparatus such as a TV.
It is also possible to record the received digital broadcast signals on a storage medium instead of directly outputting the received broadcast signals to A/V output devices. The stored digital broadcast signals can be edited and retrieved afterwards. For example, a digital data stream received by a set top box can be stored in a streamer such as a digital video disk (DVD) recording apparatus after transmitted through communication interfaces like an IEEE-1394 serial bus. Later, the stored digital data stream can be edited and transmitted back to the set top box so that the stored original digital audio and video data can be presented.
For the above-mentioned systems, it is necessary to develop a method for recording a received digital data stream on a recording medium by partitioning the received data stream into minimum presentation units, each minimum presentation unit being a data decoding unit. Unless the recorded data stream maps to random-accessible minimum presentation units, the initial reproduction of the recorded stream after search operations may be imperfect.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a method and apparatus that records a received digital data stream by partitioning the received digital data stream into random-accessible data units.
A method for recording digital data streams in accordance with the present invention includes: (a) checking the existence of presentation entry point information for data discrete reproduction in a received digital transport stream of digital transport stream units, the presentation entry point information having been selectively inserted into the digital transport stream; (b) creating and recording information regarding the location of data section based upon the checked result, the data section being separated by the presentation entry point information; and (c) creating and recording indication information for a stream object containing groups of transport stream units, the indication information indicating whether the information regarding the location of data sections separated by the presentation entry point information exists or not.
Another method for recording digital data streams in accordance with the present invention includes: recording a received digital transport stream containing digital transport stream units by grouping the digital transport stream units into stream object units; and creating and recording information indicating whether presentation entry point information for data discrete reproduction is included in the created stream object units or not.
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Kang Ki Won
Kim Byung-jin
Seo Kang-Soo
Yoo Jea-Yong
Birch & Stewart Kolasch & Birch, LLP
Boccio Vincent
LG Electronics Inc.
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