Patents by Inventor Per Hedelin

Per Hedelin 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: 20230049495
    Abstract: Embodiments are directed to a companding method and system for reducing coding noise in an audio codec. A compression process reduces an original dynamic range of an initial audio signal through a compression process that divides the initial audio signal into a plurality of segments using a defined window shape, calculates a wideband gain in the frequency domain using a non-energy based average of frequency domain samples of the initial audio signal, and applies individual gain values to amplify segments of relatively low intensity and attenuate segments of relatively high intensity. The compressed audio signal is then expanded back to the substantially the original dynamic range that applies inverse gain values to amplify segments of relatively high intensity and attenuating segments of relatively low intensity. A QMF filterbank is used to analyze the initial audio signal to obtain a frequency domain representation.
    Type: Application
    Filed: August 18, 2022
    Publication date: February 16, 2023
    Applicants: DOLBY INTERNATIONAL AB, DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Per Hedelin, Arijit Biswas, Michael Schug, Vinay Melkote
  • Publication number: 20220277754
    Abstract: Described herein is a method of encoding an audio signal. The method comprises: generating a plurality of subband audio signals based on the audio signal; determining a spectral envelope of the audio signal; for each subband audio signal, determining autocorrelation information for the subband audio signal based on an autocorrelation function of the subband audio signal; and generating an encoded representation of the audio signal, the encoded representation comprising a representation of the spectral envelope of the audio signal and a representation of the autocorrelation information for the plurality of subband audio signals. Further described are methods of decoding the audio signal from the encoded representation, as well as corresponding encoders, decoders, computer programs, and computer-readable recording media.
    Type: Application
    Filed: August 18, 2020
    Publication date: September 1, 2022
    Applicant: Dolby International AB
    Inventors: Lars Villemoes, Heidi-Maria Lehtonen, Heiko Purnhagen, Per Hedelin
  • Patent number: 11423923
    Abstract: Embodiments are directed to a companding method and system for reducing coding noise in an audio codec. A compression process reduces an original dynamic range of an initial audio signal through a compression process that divides the initial audio signal into a plurality of segments using a defined window shape, calculates a wideband gain in the frequency domain using a non-energy based average of frequency domain samples of the initial audio signal, and applies individual gain values to amplify segments of relatively low intensity and attenuate segments of relatively high intensity. The compressed audio signal is then expanded back to the substantially the original dynamic range that applies inverse gain values to amplify segments of relatively high intensity and attenuating segments of relatively low intensity. A QMF filterbank is used to analyze the initial audio signal to obtain a frequency domain representation.
    Type: Grant
    Filed: June 3, 2020
    Date of Patent: August 23, 2022
    Assignees: DOLBY LABORATORIES LICENSING CORPORATION, DOLBY INTERNATIONAL AB
    Inventors: Per Hedelin, Arijit Biswas, Michael Schug, Vinay Melkote
  • Publication number: 20220180849
    Abstract: The present document relates to audio coding systems which make use of a harmonic transposition method for high frequency reconstruction (HFR), and to digital effect processors, e.g. so-called exciters, where generation of harmonic distortion adds brightness to the processed signal. In particular, a system configured to generate a high frequency component of a signal from a low frequency component of the signal is described. The system may comprise an analysis filter bank (501) configured to provide a set of analysis subband signals from the low frequency component of the signal; wherein the set of analysis subband signals comprises at least two analysis subband signals; wherein the analysis filter bank (501) has a frequency resolution of ?f.
    Type: Application
    Filed: December 13, 2021
    Publication date: June 9, 2022
    Applicant: Dolby International AB
    Inventors: Per EKSTRAND, Lars VILLEMOES, Per HEDELIN
  • Publication number: 20220044694
    Abstract: Described herein is a method of decoding an audio or speech signal, the method including the steps of: (a) receiving, by a decoder, a coded bitstream including the audio or speech signal and conditioning information; (b) providing, by a bitstream decoder, decoded conditioning information in a format associated with a first bitrate; (c) converting, by a converter, the decoded conditioning information from the format associated with the first bitrate to a format associated with a second bitrate; and (d) providing, by a generative neural network, a reconstruction of the audio or speech signal according to a probabilistic model conditioned by the conditioning information in the format associated with the second bitrate. Described are further an apparatus for decoding an audio or speech signal, a respective encoder, a system of the encoder and the apparatus for decoding an audio or speech signal as well as a respective computer program product.
    Type: Application
    Filed: October 29, 2019
    Publication date: February 10, 2022
    Applicant: Dolby International AB
    Inventors: Janusz Klejsa, Per Hedelin
  • Patent number: 11200874
    Abstract: The present document relates to audio coding systems which make use of a harmonic transposition method for high frequency reconstruction (HFR), and to digital effect processors, e.g. so-called exciters, where generation of harmonic distortion adds brightness to the processed signal. In particular, a system configured to generate a high frequency component of a signal from a low frequency component of the signal is described. The system may comprise an analysis filter bank (501) configured to provide a set of analysis subband signals from the low frequency component of the signal; wherein the set of analysis subband signals comprises at least two analysis subband signals; wherein the analysis filter bank (501) has a frequency resolution of ?f.
    Type: Grant
    Filed: May 18, 2020
    Date of Patent: December 14, 2021
    Assignee: Dolby International AB
    Inventors: Per Ekstrand, Lars Villemoes, Per Hedelin
  • Publication number: 20210366500
    Abstract: The present invention relates to audio coding systems which make use of a harmonic transposition method for high frequency reconstruction (HFR). A system and a method for generating a high frequency component of a signal from a low frequency component of the signal is described. The system comprises an analysis filter bank providing a plurality of analysis subband signals of the low frequency component of the signal. It also comprises a non-linear processing unit to generate a synthesis subband signal with a synthesis frequency by modifying the phase of a first and a second of the plurality of analysis subband signals and by combining the phase-modified analysis subband signals. Finally, it comprises a synthesis filter bank for generating the high frequency component of the signal from the synthesis subband signal.
    Type: Application
    Filed: June 3, 2021
    Publication date: November 25, 2021
    Applicant: Dolby International AB
    Inventors: Lars VILLEMOES, Per HEDELIN
  • Patent number: 11031025
    Abstract: The present invention relates to audio coding systems which make use of a harmonic transposition method for high frequency reconstruction (HFR). A system and a method for generating a high frequency component of a signal from a low frequency component of the signal is described. The system comprises an analysis filter bank providing a plurality of analysis subband signals of the low frequency component of the signal. It also comprises a non-linear processing unit to generate a synthesis subband signal with a synthesis frequency by modifying the phase of a first and a second of the plurality of analysis subband signals and by combining the phase-modified analysis subband signals. Finally, it comprises a synthesis filter bank for generating the high frequency component of the signal from the synthesis subband signal.
    Type: Grant
    Filed: March 5, 2020
    Date of Patent: June 8, 2021
    Assignee: Dolby International AB
    Inventors: Lars Villemoes, Per Hedelin
  • Publication number: 20200395031
    Abstract: Embodiments are directed to a companding method and system for reducing coding noise in an audio codec. A compression process reduces an original dynamic range of an initial audio signal through a compression process that divides the initial audio signal into a plurality of segments using a defined window shape, calculates a wideband gain in the frequency domain using a non-energy based average of frequency domain samples of the initial audio signal, and applies individual gain values to amplify segments of relatively low intensity and attenuate segments of relatively high intensity. The compressed audio signal is then expanded back to the substantially the original dynamic range that applies inverse gain values to amplify segments of relatively high intensity and attenuating segments of relatively low intensity. A QMF filterbank is used to analyze the initial audio signal to obtain a frequency domain representation.
    Type: Application
    Filed: June 3, 2020
    Publication date: December 17, 2020
    Applicants: DOLBY INTERNATIONAL AB, DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Per Hedelin, Arijit Biswas, Michael Schug, Vinay Melkote
  • Publication number: 20200349911
    Abstract: The present document relates to audio coding systems which make use of a harmonic transposition method for high frequency reconstruction (HFR), and to digital effect processors, e.g. so-called exciters, where generation of harmonic distortion adds brightness to the processed signal. In particular, a system configured to generate a high frequency component of a signal from a low frequency component of the signal is described. The system may comprise an analysis filter bank (501) configured to provide a set of analysis subband signals from the low frequency component of the signal; wherein the set of analysis subband signals comprises at least two analysis subband signals; wherein the analysis filter bank (501) has a frequency resolution of ?f.
    Type: Application
    Filed: May 18, 2020
    Publication date: November 5, 2020
    Applicant: Dolby International AB
    Inventors: Per EKSTRAND, Lars VILLEMOES, Per HEDELIN
  • Publication number: 20200273476
    Abstract: The present invention relates to audio coding systems which make use of a harmonic transposition method for high frequency reconstruction (HFR). A system and a method for generating a high frequency component of a signal from a low frequency component of the signal is described. The system comprises an analysis filter bank providing a plurality of analysis subband signals of the low frequency component of the signal. It also comprises a non-linear processing unit to generate a synthesis subband signal with a synthesis frequency by modifying the phase of a first and a second of the plurality of analysis subband signals and by combining the phase-modified analysis subband signals. Finally, it comprises a synthesis filter bank for generating the high frequency component of the signal from the synthesis subband signal.
    Type: Application
    Filed: March 5, 2020
    Publication date: August 27, 2020
    Applicant: Dolby International AB
    Inventors: Lars VILLEMOES, Per HEDELIN
  • Patent number: 10679639
    Abstract: Embodiments are directed to a companding method and system for reducing coding noise in an audio codec. A compression process reduces an original dynamic range of an initial audio signal through a compression process that divides the initial audio signal into a plurality of segments using a defined window shape, calculates a wideband gain in the frequency domain using a non-energy based average of frequency domain samples of the initial audio signal, and applies individual gain values to amplify segments of relatively low intensity and attenuate segments of relatively high intensity. The compressed audio signal is then expanded back to the substantially the original dynamic range that applies inverse gain values to amplify segments of relatively high intensity and attenuating segments of relatively low intensity. A QMF filterbank is used to analyze the initial audio signal to obtain a frequency domain representation.
    Type: Grant
    Filed: June 28, 2019
    Date of Patent: June 9, 2020
    Assignees: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Per Hedelin, Arijit Biswas, Michael Schug, Vinay Melkote
  • Patent number: 10657937
    Abstract: The present document relates to audio coding systems which make use of a harmonic transposition method for high frequency reconstruction (HFR), and to digital effect processors, e.g. so-called exciters, where generation of harmonic distortion adds brightness to the processed signal. In particular, a system configured to generate a high frequency component of a signal from a low frequency component of the signal is described. The system may comprise an analysis filter bank (501) configured to provide a set of analysis subband signals from the low frequency component of the signal; wherein the set of analysis subband signals comprises at least two analysis subband signals; wherein the analysis filter bank (501) has a frequency resolution of ?f.
    Type: Grant
    Filed: April 5, 2019
    Date of Patent: May 19, 2020
    Assignee: Dolby International AB
    Inventors: Per Ekstrand, Lars Villemoes, Per Hedelin
  • Publication number: 20200126574
    Abstract: The present document relates an audio encoding and decoding system (referred to as an audio codec system). In particular, the present document relates to a audio codec system which is particularly well suited for voice encoding/decoding. A transform-based speech encoder is configured to encode a speech signal into a bitstream is described. A speech decoder configured to decode audio signals from a bitstream is further described.
    Type: Application
    Filed: December 18, 2019
    Publication date: April 23, 2020
    Applicant: DOLBY INTERNATIONAL AB
    Inventors: Lars VILLEMOES, Janusz KLEJSA, Per HEDELIN
  • Patent number: 10586550
    Abstract: The present invention relates to audio coding systems which make use of a harmonic transposition method for high frequency reconstruction (HFR). A system and a method for generating a high frequency component of a signal from a low frequency component of the signal is described. The system comprises an analysis filter bank providing a plurality of analysis subband signals of the low frequency component of the signal. It also comprises a non-linear processing unit to generate a synthesis subband signal with a synthesis frequency by modifying the phase of a first and a second of the plurality of analysis subband signals and by combining the phase-modified analysis subband signals. Finally, it comprises a synthesis filter bank for generating the high frequency component of the signal from the synthesis subband signal.
    Type: Grant
    Filed: December 7, 2018
    Date of Patent: March 10, 2020
    Assignee: Dolby International AB
    Inventors: Lars Villemoes, Per Hedelin
  • Patent number: 10515647
    Abstract: Systems, methods, and storage media for audio processing adapted to voice encoding/decoding are disclosed. In some implementations, a system is adapted to determine prediction coefficients based on coefficient data included within a bitstream to determine quantized prediction coefficients, the coefficient data including one or more model parameters indicating at least one attribute of a signal model. The system inversely quantizes the quantized prediction coefficients to determine dequantized prediction coefficients. The system then determines multiple spectral energy values for multiple corresponding frequency bands based on the dequantized prediction coefficients.
    Type: Grant
    Filed: July 11, 2018
    Date of Patent: December 24, 2019
    Assignee: Dolby International AB
    Inventors: Lars Villemoes, Janusz Klejsa, Per Hedelin
  • Publication number: 20190325890
    Abstract: Embodiments are directed to a companding method and system for reducing coding noise in an audio codec. A compression process reduces an original dynamic range of an initial audio signal through a compression process that divides the initial audio signal into a plurality of segments using a defined window shape, calculates a wideband gain in the frequency domain using a non-energy based average of frequency domain samples of the initial audio signal, and applies individual gain values to amplify segments of relatively low intensity and attenuate segments of relatively high intensity. The compressed audio signal is then expanded back to the substantially the original dynamic range that applies inverse gain values to amplify segments of relatively high intensity and attenuating segments of relatively low intensity. A QMF filterbank is used to analyze the initial audio signal to obtain a frequency domain representation.
    Type: Application
    Filed: June 28, 2019
    Publication date: October 24, 2019
    Applicants: DOLBY INTERNATIONAL AB, DOLBY LABORATORIES LICENSING CORPORATION
    Inventors: Per Hedelin, Arijit Biswas, Michael Schug, Vinay Melkote
  • Patent number: 10373627
    Abstract: Embodiments are directed to a companding method and system for reducing coding noise in an audio codec. A compression process reduces an original dynamic range of an initial audio signal through a compression process that divides the initial audio signal into a plurality of segments using a defined window shape, calculates a wideband gain in the frequency domain using a non-energy based average of frequency domain samples of the initial audio signal, and applies individual gain values to amplify segments of relatively low intensity and attenuate segments of relatively high intensity. The compressed audio signal is then expanded back to the substantially the original dynamic range that applies inverse gain values to amplify segments of relatively high intensity and attenuating segments of relatively low intensity. A QMF filterbank is used to analyze the initial audio signal to obtain a frequency domain representation.
    Type: Grant
    Filed: March 8, 2018
    Date of Patent: August 6, 2019
    Assignees: Dolby Laboratories Licensing Corporation, Dolby International AB
    Inventors: Per Hedelin, Arijit Biswas, Michael Schug, Vinay Melkote
  • Publication number: 20190237052
    Abstract: The present document relates to audio coding systems which make use of a harmonic transposition method for high frequency reconstruction (HFR), and to digital effect processors, e.g. so-called exciters, where generation of harmonic distortion adds brightness to the processed signal. In particular, a system configured to generate a high frequency component of a signal from a low frequency component of the signal is described. The system may comprise an analysis filter bank (501) configured to provide a set of analysis subband signals from the low frequency component of the signal; wherein the set of analysis subband signals comprises at least two analysis subband signals; wherein the analysis filter bank (501) has a frequency resolution of ?f.
    Type: Application
    Filed: April 5, 2019
    Publication date: August 1, 2019
    Applicant: Dolby International AB
    Inventors: Per Ekstrand, Lars Villemoes, Per Hedelin
  • Patent number: 10311884
    Abstract: The present document relates an audio encoding and decoding system (referred to as an audio codec system). In particular, the present document relates to a transform-based audio codec system which is particularly well suited for voice encoding/decoding. A quantization unit configured to quantize a first coefficient of a block of coefficients is described. The block of coefficients comprises a plurality of coefficients for a plurality of corresponding frequency bins. The quantization unit is configured to provide a set of quantizers. The set of quantizers comprises a plurality of different quantizers associated with a plurality of different signal-to-noise ratios, referred to as SNR, respectively. The plurality of different quantizers includes a noise-filling quantizer; one or more dithered quantizers; and one or more un-dithered quantizers.
    Type: Grant
    Filed: March 22, 2018
    Date of Patent: June 4, 2019
    Assignee: Dolby International AB
    Inventors: Janusz Klejsa, Lars Villemoes, Per Hedelin