Patents by Inventor Eleni FOTOPOULOU

Eleni FOTOPOULOU 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).

  • Publication number: 20180366133
    Abstract: A downscaled version of an audio decoding procedure may more effectively and/or at improved compliance maintenance be achieved if the synthesis window used for downscaled audio decoding is a downsampled version of a reference synthesis window involved in the non-downscaled audio decoding procedure by downsampling by the downsampling factor by which the downsampled sampling rate and the original sampling rate deviate, and downsampled using a segmental interpolation in segments of 1/4 of the frame length.
    Type: Application
    Filed: December 15, 2017
    Publication date: December 20, 2018
    Inventors: Markus SCHNELL, Manfred LUTZKY, Eleni FOTOPOULOU, Konstantin SCHMIDT, Conrad BENNDORF, Adrian TOMASEK, Tobias ALBERT, Timon SEIDL
  • Publication number: 20180342252
    Abstract: An apparatus for encoding a multi-channel signal including at least two channels includes a time-spectral converter for converting sequences of blocks of sampling values of the at least two channels into a frequency domain representation having sequences of blocks of spectral values for the at least two channels; a multi-channel processor for applying a joint multi-channel processing to the sequences of blocks of spectral values to obtain at least one result sequence of blocks of spectral values including information related to the at least two channels; a spectral-time converter for converting the result sequence of blocks of spectral values into a time domain representation including an output sequence of blocks of sampling values; and a core encoder for encoding the output sequence of blocks of sampling values to obtain an encoded multi-channel signal.
    Type: Application
    Filed: July 13, 2018
    Publication date: November 29, 2018
    Inventors: Guillaume FUCHS, Emmanuel RAVELLI, Markus MULTRUS, Markus SCHNELL, Stefan DOEHLA, Martin DIETZ, Goran MARKOVIC, Eleni FOTOPOULOU, Stefan BAYER, Wolfgang JAEGERS
  • Publication number: 20180330740
    Abstract: An apparatus for encoding a first channel and a second channel of an audio input signal including two or more channels to obtain an encoded audio signal according to an embodiment includes a normalizer configured to determine a normalization value for the audio input signal depending on the first channel of the audio input signal and depending on the second channel of the audio input signal. Moreover, the apparatus includes an encoding unit configured to generate a processed audio signal having a first channel and a second channel. The encoding unit is configured to encode the processed audio signal to obtain the encoded audio signal.
    Type: Application
    Filed: July 20, 2018
    Publication date: November 15, 2018
    Inventors: Emmanuel Ravelli, Markus Schnell, Stefan Doehla, Wolfgang Jaegers, Martin Dietz, Christian Helmrich, Goran Markovic, Eleni Fotopoulou, Markus Multrus, Stefan Bayer, Guillaume Fuchs, Juergen Herre
  • Publication number: 20180322883
    Abstract: The apparatus for encoding a multi-channel signal having at least two channels, includes: a parameter determiner for determining a broadband alignment parameter and a plurality of narrowband alignment parameters from the multichannel signal; a signal aligner for aligning the at least two channels using the broadband alignment parameter and the plurality of narrowband alignment parameters to obtain aligned channels; a signal processor for calculating a mid-signal and a side signal using the aligned channels; a signal encoder for encoding the mid-signal to obtain an encoded mid-signal and for encoding the side signal to obtain an encoded side signal; and an output interface for generating an encoded multi-channel signal including the encoded mid-signal, the encoded side signal, information on the broadband alignment parameter and information on the plurality of narrowband alignment parameters.
    Type: Application
    Filed: July 12, 2018
    Publication date: November 8, 2018
    Inventors: Stefan BAYER, Eleni FOTOPOULOU, Markus MULTRUS, Guillaume FUCHS, Emmanuel RAVELLI, Markus SCHNELL, Stefan DOEHLA, Wolfgang JAEGERS, Martin DIETZ, Goran MARKOVIC
  • Publication number: 20180322884
    Abstract: An apparatus for estimating an inter-channel time difference between a first channel signal and a second channel signal, includes: a calculator for calculating a cross-correlation spectrum for a time block from the first channel signal in the time block and the second channel signal in the time block; a spectral characteristic estimator for estimating a characteristic of a spectrum of the first channel signal or the second channel signal for the time block; a smoothing filter for smoothing the cross-correlation spectrum over time using the spectral characteristic to obtain a smoothed cross-correlation spectrum; and a processor for processing the smoothed cross-correlation spectrum to obtain the inter-channel time difference.
    Type: Application
    Filed: July 13, 2018
    Publication date: November 8, 2018
    Inventors: Stefan BAYER, Eleni FOTOPOULOU, Markus MULTRUS, Guillaume FUCHS, Emmanuel RAVELLI, Markus SCHNELL, Stefan DOEHLA, Wolfgang JAEGERS, Martin DIETZ, Goran MARKOVIC
  • Publication number: 20180197552
    Abstract: An apparatus for encoding a multi-channel signal having at least two channels, has: a time-spectral converter for converting sequences of blocks of sample values of the at least two channels into a frequency domain representation having sequences of blocks of spectral values for the at least two channels, wherein a block of sampling values has an associated input sampling rate, and a block of spectral values of the sequences of blocks of spectral values has spectral values up to a maximum input frequency being related to the input sampling rate; a multi-channel processor to obtain at least one result sequence of blocks of spectral values having information related to the at least two channels; a spectral domain resampler to obtain a resampled sequence of blocks of spectral values; a spectral-time converter for converting the resampled sequence of blocks of spectral values into a time domain representation; and a core encoder for encoding the output sequence of blocks of sampling values to obtain an encoded mu
    Type: Application
    Filed: November 22, 2017
    Publication date: July 12, 2018
    Inventors: Guillaume FUCHS, Emmanuel RAVELLI, Markus MULTRUS, Markus SCHNELL, Stefan DOEHLA, Martin DIETZ, Goran MARKOVIC, Eleni FOTOPOULOU, Stefan BAYER, Wolfgang JAEGERS
  • Publication number: 20180144756
    Abstract: A codec allowing for switching between different coding modes is improved by, responsive to a switching instance, performing temporal smoothing and/or blending at a respective transition.
    Type: Application
    Filed: January 17, 2018
    Publication date: May 24, 2018
    Inventors: Martin DIETZ, Eleni FOTOPOULOU, Jérémie LECOMTE, Markus MULTRUS, Benjamin SCHUBERT
  • Patent number: 9934787
    Abstract: A codec allowing for switching between different coding modes is improved by, responsive to a switching instance, performing temporal smoothing and/or blending at a respective transition.
    Type: Grant
    Filed: July 29, 2015
    Date of Patent: April 3, 2018
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventors: Martin Dietz, Eleni Fotopoulou, Jérémie Lecomte, Markus Multrus, Benjamin Schubert
  • Patent number: 9536530
    Abstract: An information signal reconstructor is configured to reconstruct, using aliasing cancellation, an information signal from a lapped transform representation of the information signal including, for each of consecutive, overlapping regions of the information signal, a transform of a windowed version of the respective region, wherein the information signal reconstructor is configured to reconstruct the information signal at a sample rate which changes at a border between a preceding region and a succeeding region of the information signal.
    Type: Grant
    Filed: November 9, 2012
    Date of Patent: January 3, 2017
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventors: Markus Schnell, Ralf Geiger, Emmanuel Ravelli, Eleni Fotopoulou
  • Publication number: 20150332698
    Abstract: An apparatus for selecting one of a first encoding algorithm having a first characteristic and a second encoding algorithm having a second characteristic for encoding a portion of an audio signal to obtain an encoded version of the portion of the audio signal has a first estimator for estimating a first quality measure for the portion of the audio signal, which is associated with the first encoding algorithm, without actually encoding and decoding the portion of the audio signal using the first encoding algorithm. A second estimator is provided for estimating a second quality measure for the portion of the audio signal, which is associated with the second encoding algorithm, without actually encoding and decoding the portion of the audio signal using the second encoding algorithm. The apparatus has a controller for selecting the first or second encoding algorithms based on a comparison between the first and second quality measures.
    Type: Application
    Filed: July 29, 2015
    Publication date: November 19, 2015
    Inventors: Emmanuel RAVELLI, Stefan DOEHLA, Guillaume FUCHS, Eleni FOTOPOULOU, Christian HELMRICH
  • Publication number: 20150332693
    Abstract: A codec allowing for switching between different coding modes is improved by, responsive to a switching instance, performing temporal smoothing and/or blending at a respective transition.
    Type: Application
    Filed: July 29, 2015
    Publication date: November 19, 2015
    Inventors: Martin DIETZ, Eleni FOTOPOULOU, Jeremie LECOMTE, Markus MULTRUS, Benjamin SCHUBERT