Transcoder for a variable length coded data stream

摘要

The invention relates to a transcoder ( 100 ) for a variable length coded data stream such as an MPEG 2 coded data stream transcoder ( 100 ) comprises a receiver (101) which receives the variable length coded data stream. The receiver (101) is connected to a significance processor ( 107 ) that determines if a variable length coded coefficient is significant or less significant. The significance processor ( 107 ) is connected to a truncation processor ( 111 ) which truncates the less significant coefficients. The trancoder further comprises an encode processor ( 109 ) which generates a transcoded data stream from the original significant coefficients and the truncated less significant coefficients. All processing may be performed exclusively in the variable length code domain thereby providing a low complexity and high speed transcoder.