A time function applied sample-by-sample to a block of audio samples before
A block of data in the coded bitstream containing the coded representation
of a number of data elements pertaining to the coded data that follow
the header in the bitstream.
For a given character distribution, by assigning short codes to frequently
occurring characters and longer codes to infrequently occurring characters,
Huffman's minimum redundancy encoding minimizes the average number of
bytes required to represent the characters in a text.
Static Huffman encoding uses a fixed set of codes,
based on a representative sample of data, for processing texts. Although
encoding is achieved in a single pass, the data on which the compression
is based may bear little resemblance to the actual text being compressed.
Dynamic Huffman encoding, on the other hand, reads
each text twice; once to determine the frequency distribution of the characters
in the text and once to encode the data. The codes used for compression
are computed on the basis of the statistics gathered during the first
pass with compressed texts being prefixed by a copy of the Huffman encoding
table for use with the decoding process.
By using a single-pass technique, where each character
is encoded on the basis of the preceding characters in a text, Gallager's
adaptive Huffman encoding avoids many of the problems associated with
either the static or dynamic method.
A serial combination of subband filterbank and MDCT.
© 1999-2000 Gabriel
Bouvigne for MP3'Tech - www.mp3tech.org