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).

  • Patent number: 11341979
    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: Grant
    Filed: October 29, 2021
    Date of Patent: May 24, 2022
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventors: Markus Schnell, Manfred Lutzky, Eleni Fotopoulou, Konstantin Schmidt, Conrad Benndorf, Adrian Tomasek, Tobias Albert, Timon Seidl
  • Patent number: 11341978
    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 ¼ of the frame length.
    Type: Grant
    Filed: October 29, 2021
    Date of Patent: May 24, 2022
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventors: Markus Schnell, Manfred Lutzky, Eleni Fotopoulou, Konstantin Schmidt, Conrad Benndorf, Adrian Tomasek, Tobias Albert, Timon Seidl
  • Patent number: 11341980
    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 ¼ of the frame length.
    Type: Grant
    Filed: October 29, 2021
    Date of Patent: May 24, 2022
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventors: Markus Schnell, Manfred Lutzky, Eleni Fotopoulou, Konstantin Schmidt, Conrad Benndorf, Adrian Tomasek, Tobias Albert, Timon Seidl
  • Publication number: 20220108706
    Abstract: A multi-channel audio encoder for providing an encoded audio representation on the basis of an input audio representation is provided. The multi-channel audio encoder is configured to switch between a parametric multi-channel encoding of a plurality of channels and an individual encoding of a plurality of channels in dependence on characteristics of the input audio representation.
    Type: Application
    Filed: October 1, 2021
    Publication date: April 7, 2022
    Inventors: Emmanuel RAVELLI, Eleni FOTOPOULOU, Markus MULTRUS, Guillaume FUCHS
  • Publication number: 20220051683
    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: October 29, 2021
    Publication date: February 17, 2022
    Inventors: Markus SCHNELL, Manfred LUTZKY, Eleni FOTOPOULOU, Konstantin SCHMIDT, Conrad BENNDORF, Adrian TOMASEK, Tobias ALBERT, Timon SEIDL
  • Publication number: 20220051682
    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 ¼ of the frame length.
    Type: Application
    Filed: October 29, 2021
    Publication date: February 17, 2022
    Inventors: Markus SCHNELL, Manfred LUTZKY, Eleni FOTOPOULOU, Konstantin SCHMIDT, Conrad BENNDORF, Adrian TOMASEK, Tobias ALBERT, Timon SEIDL
  • Publication number: 20220051684
    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 ¼ of the frame length.
    Type: Application
    Filed: October 29, 2021
    Publication date: February 17, 2022
    Inventors: Markus SCHNELL, Manfred LUTZKY, Eleni FOTOPOULOU, Konstantin SCHMIDT, Conrad BENNDORF, Adrian TOMASEK, Tobias ALBERT, Timon SEIDL
  • Publication number: 20220036911
    Abstract: An apparatus for generating an output downmix representation from an input downmix representation, wherein at least a portion of the input downmix representation is in accordance with a first downmixing scheme, includes: an upmixer for upmixing at least the portion of the input downmix representation using an upmixing scheme corresponding to the first downmixing scheme to obtain at least one upmixed portion; and a downmixer for downmixing the at least one upmixed portion in accordance with a second downmixing scheme different from the first downmixing scheme.
    Type: Application
    Filed: October 14, 2021
    Publication date: February 3, 2022
    Inventors: Franz REUTELHUBER, Eleni FOTOPOULOU, Markus MULTRUS
  • Publication number: 20210375293
    Abstract: A downmixer for downmixing a multi-channel signal having at least two channels, includes: a weighting value estimator for estimating band-wise weighting values for the at least two channels; a spectral weighter for weighting spectral domain representations of the at least two channels using the band-wise weighting values; a converter for converting weighted spectral domain representations of the at least two channels into time representations of the at least two channels; and a mixer for mixing the time representations of the at least two channels to obtain a downmix signal.
    Type: Application
    Filed: August 12, 2021
    Publication date: December 2, 2021
    Inventors: Franz REUTELHUBER, Bernd EDLER, Eleni FOTOPOULOU, Markus MULTRUS, Pallavi MABEN, Sascha DISCH
  • Publication number: 20210335371
    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 ¼ of the frame length.
    Type: Application
    Filed: July 2, 2021
    Publication date: October 28, 2021
    Inventors: Markus SCHNELL, Manfred LUTZKY, Eleni FOTOPOULOU, Konstantin SCHMIDT, Conrad BENNDORF, Adrian TOMASEK, Tobias ALBERT, Timon SEIDL
  • Publication number: 20210256984
    Abstract: An apparatus for providing a processed audio signal representation on the basis of input audio signal representation configured to apply an un-windowing, in order to provide the processed audio signal representation on the basis of the input audio signal representation. The apparatus is configured to adapt the un-windowing in dependence on one or more signal characteristics and/or in dependence on one or more processing parameters used for a provision of the input audio signal representation.
    Type: Application
    Filed: May 5, 2021
    Publication date: August 19, 2021
    Inventors: Stefan BAYER, Pallavi MABEN, Emmanuel RAVELLI, Guillaume FUCHS, Eleni FOTOPOULOU, Markus MULTRUS
  • Publication number: 20210256983
    Abstract: An apparatus for providing a processed audio signal representation on the basis of input audio signal representation configured to apply an un-windowing, in order to provide the processed audio signal representation on the basis of the input audio signal representation. The apparatus is configured to adapt the un-windowing in dependence on one or more signal characteristics and/or in dependence on one or more processing parameters used for a provision of the input audio signal representation.
    Type: Application
    Filed: May 5, 2021
    Publication date: August 19, 2021
    Inventors: Stefan Bayer, Pallavi Maben, Emmanuel Ravelli, Guillaume Fuchs, Eleni Fotopoulou, Markus Multrus
  • Publication number: 20210256982
    Abstract: An apparatus for providing a processed audio signal representation on the basis of input audio signal representation configured to apply an un-windowing, in order to provide the processed audio signal representation on the basis of the input audio signal representation. The apparatus is configured to adapt the un-windowing in dependence on one or more signal characteristics and/or in dependence on one or more processing parameters used for a provision of the input audio signal representation.
    Type: Application
    Filed: May 4, 2021
    Publication date: August 19, 2021
    Inventors: Stefan BAYER, Pallavi MABEN, Emmanuel RAVELLI, Guillaume FUCHS, Eleni FOTOPOULOU, Markus MULTRUS
  • Patent number: 11062719
    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 ¼ of the frame length.
    Type: Grant
    Filed: August 23, 2019
    Date of Patent: July 13, 2021
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventors: Markus Schnell, Manfred Lutzky, Eleni Fotopoulou, Konstantin Schmidt, Conrad Benndorf, Adrian Tomasek, Tobias Albert, Timon Seidl
  • Publication number: 20210104249
    Abstract: A multisignal encoder for encoding at least three audio signals, including: a signal preprocessor for individually preprocessing each audio signal to obtain at least three preprocessed audio signals, wherein the preprocessing is performed so that a preprocessed audio signal is whitened with respect to the signal before preprocessing; an adaptive joint signal processor for performing a processing of the at least three preprocessed audio signals to obtain at least three jointly processed signals or at least two jointly processed signals and an unprocessed signal; a signal encoder for encoding each signal to obtain one or more encoded signals; and an output interface for transmitting or storing an encoded multisignal audio signal including the one or more encoded signals, side information relating to the preprocessing and side information relating to the processing.
    Type: Application
    Filed: December 17, 2020
    Publication date: April 8, 2021
    Inventors: Eleni FOTOPOULOU, Markus Multrus, Sascha Dick, Goran Markovic, Pallavi Maben, Srikanth Korse, Stefan Bayer, Sascha Disch, Jürgen Herre
  • Publication number: 20210098007
    Abstract: In multichannel audio coding, improved computational efficiency is achieved by computing comparison parameters for ITD compensation between any two channels in the frequency domain for a parametric audio encoder. This may mitigate negative effects on encoder parameter estimates.
    Type: Application
    Filed: December 15, 2020
    Publication date: April 1, 2021
    Inventors: Jan BÜTHE, Eleni FOTOPOULOU, Srikanth KORSE, Pallavi MABEN, Markus MULTRUS, Franz REUTELHUBER
  • Publication number: 20210065722
    Abstract: The invention refers to audio encoders, audio decoders, and audio encoding methods and audio decoding methods. In some examples, the invention refers to improved stereo coding. An encoder provides an encoded representation of an audio signal. The encoder applies a spectral whitening to a separate-channel representation of the input audio signal, to obtain a whitened separate-channel representation of the signal. The audio encoder applies a spectral whitening to a mid-side representation of the signal, to obtain a whitened mid-side representation of the signal. The audio encoder decides whether to encode the whitened separate-channel representation of the signal, to obtain the encoded representation of the signal, or to encode the whitened mid-side representation of the signal, to obtain the encoded representation of the signal.
    Type: Application
    Filed: August 28, 2020
    Publication date: March 4, 2021
    Inventors: Goran MARKOVIC, Sascha DICK, Eleni FOTOPOULOU, Stefan BAYER
  • Publication number: 20210012784
    Abstract: An apparatus for estimating an inter-channel time difference between a first channel signal and a second channel signal, includes a signal analyzer for estimating a signal characteristic of the first channel signal or the second channel signal or both signals or a signal derived from the first channel signal or the second channel signal; 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 weighter for weighting a smoothed or non-smoothed cross-correlation spectrum to obtain a weighted cross correlation spectrum using a first weighting procedure or using a second weighting procedure depending on a signal characteristic estimated by the signal analyzer, wherein the first weighting procedure is different from the second weighting procedure; and a processor for processing the weighted cross-correlation spectrum to obtain the inter-channel time difference.
    Type: Application
    Filed: September 29, 2020
    Publication date: January 14, 2021
    Inventors: Eleni FOTOPOULOU, Jan BÜTHE, Emmanuel RAVELLI, Pallavi MABEN, Martin DIETZ, Franz REUTELHUBER, Stefan DÖHLA, Srikanth KORSE
  • Patent number: 10861468
    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: Grant
    Filed: July 12, 2018
    Date of Patent: December 8, 2020
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventors: Stefan Bayer, Eleni Fotopoulou, Markus Multrus, Guillaume Fuchs, Emmanuel Ravelli, Markus Schnell, Stefan Doehla, Wolfgang Jaegers, Martin Dietz, Goran Markovic
  • Patent number: 10854211
    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: Grant
    Filed: April 4, 2019
    Date of Patent: December 1, 2020
    Assignee: Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V.
    Inventors: Guillaume Fuchs, Emmanuel Ravelli, Markus Multrus, Markus Schnell, Stefan Doehla, Martin Dietz, Goran Markovic, Eleni Fotopoulou, Stefan Bayer, Wolfgang Jaegers