Patent ID: 6377588
Filing Date: 2002-04-23
Classification: H04N

Abstract:
An apparatus for reducing a jitter of a program clock reference in a transport stream of a Moving Picture Experts Group (MPEG) signal transmitted over an Asynchronous Transfer Mode (ATM) system, which comprises:a first corrector for correcting PCR to PCRâˆ’(Tâˆ’&dgr;) if |PCRâˆ’STC|>Tâˆ’&dgr;âˆ’&Dgr; is true and (PCRâˆ’STC)>0; a second corrector for correcting PCR to PCR+(Tâˆ’&dgr;) if |PCRâˆ’STC|>Tâˆ’&dgr;âˆ’&Dgr; is true and (PCRâˆ’STC)<0; and a non-corrector for making no correction if |PCRâˆ’STC|>Tâˆ’&dgr;âˆ’&Dgr; is false, wherein the program clock reference received is represented by PCR, a system time clock at the time when the program clock reference is received is represented by STC, a period of a transport stream packet at an output terminal of an MPEG encoder is represented by T, a packet transmission time of the transport stream packet at an input terminal of the apparatus is represented by &dgr;, and a tolerable range is represented by &Dgr;.