Method and apparatus for audio compression

Details Method and apparatus for audio compression Method and apparatus for audio compression

2007-02-20

2007-02-20

Lerner, Martin (Department: 2626)

Data processing: speech signal processing, linguistics, language

Audio signal bandwidth compression or expansion

C704S200100, C704S205000, C704S501000

Reexamination Certificate

active

11078975

ABSTRACT:
A method and apparatus for audio compression receives an audio signal. Transform coding is applied to the audio signal to generate a sequence of transform frequency coefficients. The sequence of transform frequency coefficients is partitioned into a plurality of non-uniform width frequency ranges and then zero value frequency coefficients are inserted at the boundaries of the non-uniform width frequency ranges. As a result, certain of the transform frequency coefficients that represent high frequencies are dropped.

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