Appeal No. 2002-1045
Application 09/131,890
information in the received signal. A calculated DTS of the
current picture is generated by adding previous DTS to an offset.
The transferred DTS is checked with the calculated DTS to see if
there is an error in the transferred DTS. If no errors are
detected in the DTS, then the transferred DTS is determined to be
the DTS value of the current picture. If an error is determined,
the calculated DTS is used. By controlling the picture decoding
using the determined DTS value, the bit buffer does not underflow
or overflow and the decoded data is displayed naturally on a
screen.
Representative claim 1 is reproduced as follows:
1. A picture decoding synchronizing circuit, comprising:
a detector for detecting whether at least one of a
presentation time stamp (PTS) and a decoding time stamp (DTS)
which are transferred through an input bit stream is distorted by
an error, and outputting a detect signal;
a determiner for determining an actual DTS value using a
transferred PTS and DTS if no errors are detected from the
transferred PTS and DTS according to the detect signal, and
determining an approximated DTS value using the value obtained by
adding a DTS value of a previous picture to a predetermined
offset value, if an error is detected in at least one of said PTS
and said DTS; and
a decoder for decoding the input bit stream in units of a
picture, in synchronization with one of the actual DTS value and
the approximated DTS value.
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