FAST EXTRACTION OF PROGRAM SPECIFIC INFORMATION FROM MULTIPLE TRANSPORT STREAMS

摘要

A DIGITAL TV RECEIVER SUFFERS FROM LATENCY WHEN A CHANNEL CHANGE IS MADE TO A PROGRAM IN AN OTHER THAN THE CURRENTLY ACCESSED TRANSPORT STREAM (TS). THAT IS BECAUSE THE TRANSPORT DECODER (202) MUST FIRST ACQUIRE AND DECODE THE PROGRAM SPECIFIC INFORMATION (PSI) FROM THE TRANSPORT STREAM, SUCH AS THE PROGRAM ASSOCIATION TABLE AND PROGRAM MAP TABLE. IN ACCORDANCE WITH THE INVENTION, A PRE-DECODER (203) IS SUCCESSIVELY COUPLED TO THE OTHER TRANSPORT STREAMS THROUGH A CROSS BAR SWITCH (204) TO EXTRACT THE PSI FROM SAID OTHER STREAMS AND CREATE A MAP OF CHANNELS. ( FIG 2 )