Patents Assigned to Digital Stream USA, Inc.
  • Method and apparatus for audio compression
    Publication number: 20040172239
    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.
    Type: Application
    Filed: March 3, 2003
    Publication date: September 2, 2004
    Applicant: Digital Stream USA, Inc.
    Inventors: Victor D. Kolesnik, Boris D. Kudryashov, Sergey Petrov, Evgeny Ovsyannikov, Boris Trojanovsky, Andrey Trofimov