Patents by Inventor Andrei Trofimov

Andrei Trofimov has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method and apparatus for audio compression
    Patent number: 7181404
    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: Grant
    Filed: March 11, 2005
    Date of Patent: February 20, 2007
    Assignee: XVD Corporation
    Inventors: Victor D. Kolesnik, Boris D. Kudryashov, Sergey Petrov, Evgeny Ovsyannikov, Boris Trojanovsky, Andrey Trofimov
  • Method and apparatus for audio compression
    Patent number: 6965859
    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: Grant
    Filed: March 3, 2003
    Date of Patent: November 15, 2005
    Assignee: XVD Corporation
    Inventors: Victor D. Kolesnik, Boris D. Kudryashov, Sergey Petrov, Evgeny Ovsyannikov, Boris Trojanovsky, Andrey Trofimov
  • Method and apparatus for audio compression
    Publication number: 20050159941
    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 11, 2005
    Publication date: July 21, 2005
    Inventors: Victor Kolesnik, Boris Kudryashov, Sergey Petrov, Evgeny Ovsyannikov, Boris Trojanovsky, Andrey Trofimov
  • 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
  • Method and apparatus for adaptive audio compression and decompression
    Patent number: 5832443
    Abstract: A method and apparatus for compression and decompression of an audio signal. In encoding an input audio signal, at least a portion of the audio signal is transformed into a set of coefficients. A set of binary vectors associated with the set of coefficients are generated for digitizing the transformed audio signal using a fixed rate adaptive quantization. Information based on the set of binary vectors is combinatorially encoded and output as a bit stream of encoded audio data. The encoded audio data may be stored, transmitted, and/or decoded.
    Type: Grant
    Filed: February 25, 1997
    Date of Patent: November 3, 1998
    Assignees: Alaris, Inc., G.T. Technology, Inc.
    Inventors: Victor D. Kolesnik, Irina Bocharova, Boris Kudryashov, Eugene Ovsyannikov, Andrei Trofimov, Boris Troyanovsky