Method and circuit for reading code words having variable lengths out of a memory used for code words having fixed lengths of words

摘要

Known methods for reading code words having variable lengths out of a memory used for code words having fixed lengths of words comprising an input data buffer having a barrel-shifter downstream. Using a barrel shifter the signal flow is delayed, so that disadvantageously an additional data buffer is required at the output of the shifter. There is an unfavourable timing of the disclosed method and the expenditure for the circuit is relatively high.;In the invention the operations for shifting are divided in two steps separated each other in dimension and time. The first operation for shifting is processed using a combination of one or more multiplexer and memory blocks suitable for shifting code words having variable length and none of the operations for shifting is processed using a barrel-shifter.;The invention can be used especially in the decompression of data for transmitting multimedia information, above all based on the standards H.261, JPEG and MPEG.