Method and apparatus for audio compression

A method for audio compression comprising:

• generating a plurality of non-uniform frequency subbands, each of the plurality of non-uniform frequency subbands including a set of one or more frequency coefficients, from an audio input signal;
• displacing those of the set of frequency coefficients at the boundary of each non-uniform frequency subband with zeros;
• separately normalizing the non-uniform frequency subbands, including the zeros;
• varying transform length applied to each of the plurality of non-uniform frequency subbands based on the detection of a sound attack within the plurality of non-uniform frequency subbands;
• and
• multiplexing the plurality of non-uniform frequency subbands.

A machine-readable medium having a set of instruction stored thereon, which when executed by a set of one or more processors causes the set of processors to perform the operations comprising:

• generating a plurality of frequency coefficients representing an audio signal;
• grouping the plurality of frequency coefficients into frequency ranges of non-uniform width;
• determining if a sound attack occurs in any one of the non-uniform width frequency ranges;
• and
• performing short transforms on those non-uniform frequency ranges that have a sound attack and long transforms on those non-uniform frequency ranges that do not have a sound attack.

A machine-readable medium having a set of instruction stored thereon, which when executed by a set of one or more processors causes the set of processors to perform the operations comprising:

• generating a plurality of non-uniform frequency subbands, each of the plurality of non-uniform frequency subbands including a set of one or more frequency coefficients, from an audio input signal;
• displacing those of the set of frequency coefficients at the boundary of each non-uniform frequency subband with zeros;
• separately normalizing the non-uniform frequency subbands, including the zeros;
• varying transform length applied to each of the plurality of non-uniform frequency subbands based on the detection of a sound attack within the plurality of non-uniform frequency subbands;
• and
• multiplexing the plurality of non-uniform frequency subbands.