Apparatus and method for injecting synchronized stream data in digital broadcasting environment

Abstract

An apparatus and method for injecting synchronized stream data into a Motion Picture Experts Group 2 (MPEG-2) video / audio transport stream for a digital data broadcasting service. The apparatus and method for injecting synchronized stream data calculate the injection time point of data access unit (DAU) that forms the synchronized stream data and injects DAU into the MPEG-2 video / audio transport stream based on the calculated injection time point so that the synchronized stream data could be presented smoothly in a receiver. The synchronized stream data injecting apparatus includes: an additional data storing unit, a synchronized stream data selection / establishment unit, a synchronized stream data analyzing unit, a transport stream analyzing unit, a synchronized stream data injection / management unit, a presentation time stamp re-stamping unit and a multiplexing unit.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001]This application is a Reissue of application Ser. No. 10 / 693,130 filed on Oct. 23, 2003, now U.S. Pat. No. 7,406,703 issued on Jul. 29, 2008, and claims the benefit of Korean Patent Application No. 10-2002-0065642 filed on Oct. 26, 2002, in the Korean Intellectual Property Office. The disclosures of application Ser. No. 10 / 693,130 and Korean Patent Application No. 10-2002-0065642 are incorporated herein by reference in their entirety.FIELD OF THE INVENTION[0002]The present invention relates to an apparatus and method for injecting synchronized stream data into a Moving Picture Experts Group 2 (MPEG-2) video / audio transport stream (TS) for a digital data broadcasting service.DESCRIPTION OF RELATED ART[0003]A digital broadcasting service has an advantage that diverse multimedia data could be transmitted along with video / audio data. The data that may be provided in a digital broadcasting service includes asynchronous data, synchronous data,...

AI Technical Summary

Benefits of technology

[0014]It is, therefore, an object of the present invention to provide an apparatus and method for injecting synchronized stream data for a digital data broadcasting service, the apparatus and method calculating an injection time point with respect to each data access unit (DAU) which forms synchronized stream data so that the synchronized stream data could be presented in a receiver smoothly, and injecting the DAU into a Moving Picture Experts Group 2 (MPEG-2) audio / video transport stream at the calculated injection time point.

Problems solved by technology

However, since the system model includes a function that a module encoding video / audio data into an MPEG-2 transport stream multiplexes additional data simultaneously, it has a problem that it is not compatible with conventional digital broadcasting apparatuses which multiplex video / audio data only.

In addition, since the system suggested by DIWG is for synchronized non-stream data, it has another problem that it could not provide a service of synchronized stream data.

However, the defined receiver buffer models may cause buffer overflow due to the other DAU existing in the buffer, when the DAU arrives in the receiver too quickly, and thus brings about data loss.

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