Patents by Inventor Per Elstrand

Per Elstrand 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).

  • Audio signal encoding or decoding
    Patent number: 8073685
    Abstract: Encoding an audio signal is provided wherein the audio signal includes a first audio channel and a second audio channel, the encoding comprising subband filtering each of the first audio channel and the second audio channel in a complex modulated filterbank to provide a first plurality of subband signals for the first audio channel and a second plurality of subband signals for the second audio channel, downsampling each of the subband signals to provide a first plurality of downsampled subband signals and a second plurality of downsampled subband signals, further subband filtering at least one of the downsampled subband signals in a further filterbank in order to provide a plurality of sub-subband signals, deriving spatial parameters from the sub-subband signals and from those downsampled subband signals that are not further subband filtered, and deriving a single channel audio signal comprising derived subband signals derived from the first plurality of downsampled subband signals and the second plurality of
    Type: Grant
    Filed: March 4, 2009
    Date of Patent: December 6, 2011
    Assignees: Koninklijke Philips Electronics, N.V., Dolby International AB
    Inventors: Lars Falck Villemoes, Per Elstrand, Heiko Purnhagen, Erik Gosuinus Petrus Schuijers, Fransiscus Marinus Jozephus Bont
  • AUDIO SIGNAL ENCODING OR DECODING
    Publication number: 20090216544
    Abstract: Encoding an audio signal is provided wherein the audio signal includes a first audio channel and a second audio channel, the encoding comprising subband filtering each of the first audio channel and the second audio channel in a complex modulated filterbank to provide a first plurality of subband signals for the first audio channel and a second plurality of subband signals for the second audio channel, downsampling each of the subband signals to provide a first plurality of downsampled subband signals and a second plurality of downsampled subband signals, further subband filtering at least one of the downsampled subband signals in a further filterbank in order to provide a plurality of sub-subband signals, deriving spatial parameters from the sub-subband signals and from those downsampled subband signals that are not further subband filtered, and deriving a single channel audio signal comprising derived subband signals derived from the first plurality of downsampled subband signals and the second plurality of
    Type: Application
    Filed: March 4, 2009
    Publication date: August 27, 2009
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.
    Inventors: Lars Falck VILLEMOES, Per ELSTRAND, Heiko PURNHAGEN, Erik Gosuinus Petrus SCHUIJERS, Fransiscus Marinus Jozephus BONT