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    INTEGRATION OF HIGH FREQUENCY RECONSTRUCTION TECHNIQUES WITH REDUCED POST-PROCESSING DELAY
    2.
    发明申请
    INTEGRATION OF HIGH FREQUENCY RECONSTRUCTION TECHNIQUES WITH REDUCED POST-PROCESSING DELAY 有权

    公开(公告)号：US20250118314A1

    公开(公告)日：2025-04-10

    申请号：US18982303

    申请日：2024-12-16

    Applicant: DOLBY INTERNATIONAL AB

    Inventor： Kristofer KJOERLING ,  Lars VILLEMOES ,  Heiko PURNHAGEN ,  Per EKSTRAND

    IPC: G10L19/18 ,  G10L21/038

    Abstract: A method for decoding an encoded audio bitstream is disclosed. The method includes receiving the encoded audio bitstream and decoding the audio data to generate a decoded lowband audio signal. The method further includes extracting high frequency reconstruction metadata and filtering the decoded lowband audio signal with an analysis filterbank to generate a filtered lowband audio signal. The method also includes extracting a flag indicating whether either spectral translation or harmonic transposition is to be performed on the audio data and regenerating a highband portion of the audio signal using the filtered lowband audio signal and the high frequency reconstruction metadata in accordance with the flag. The high frequency regeneration is performed as a post-processing operation with a delay of 3010 samples per audio channel.

    MULTI-BAND DUCKING OF AUDIO SIGNALS
    3.
    发明公开
    MULTI-BAND DUCKING OF AUDIO SIGNALS 审中-公开

    公开(公告)号：US20240304196A1

    公开(公告)日：2024-09-12

    申请号：US18551134

    申请日：2022-04-01

    Applicant: Dolby Laboratories Licensing Corporation ,  DOLBY INTERNATIONAL AB

    Inventor： Rishabh TYAGI ,  Heiko PURNHAGEN

    IPC: G10L19/02 ,  G10L19/008

    CPC classification number: G10L19/0204 ,  G10L19/008

    Abstract: A method for multi-band ducking of audio signals is provided. In some implementations, the method involves receiving, at a decoder, an input audio signal, wherein the input audio signal is a downmixed audio signal. In some implementations, the method involves separating the input audio signal into a first set of frequency bands. In some implementations, the method involves determining a set of ducking gains, a ducking gain corresponding to a frequency band of the first set of frequency bands. In some implementations, the method involves generating a broadband decorrelated audio signal, wherein ducking gains of the set of ducking gains are applied to at least one of: 1) a second set of frequency bands prior to generating the at least one broadband decorrelated audio signal: or 2) a third set of frequency bands that separates the at least one broadband decorrelated audio signal.

    INTEGRATION OF HIGH FREQUENCY AUDIO RECONSTRUCTION TECHNIQUES
    4.
    发明公开
    INTEGRATION OF HIGH FREQUENCY AUDIO RECONSTRUCTION TECHNIQUES 审中-公开

    公开(公告)号：US20240087590A1

    公开(公告)日：2024-03-14

    申请号：US18508415

    申请日：2023-11-14

    Applicant: DOLBY INTERNATIONAL AB

    Inventor： Kristofer KJOERLING ,  Lars VILLEMOES ,  Heiko PURNHAGEN ,  Per EKSTRAND

    IPC: G10L21/0388 ,  G10L19/008 ,  G10L19/02 ,  H04S3/00

    CPC classification number: G10L21/0388 ,  G10L19/008 ,  G10L19/02 ,  H04S3/008

    Abstract: A method for decoding an encoded audio bitstream is disclosed. The method includes receiving the encoded audio bitstream and decoding the audio data to generate a decoded lowband audio signal. The method further includes extracting high frequency reconstruction metadata and filtering the decoded lowband audio signal with an analysis filterbank to generate a filtered lowband audio signal. The method also includes extracting a flag indicating whether either spectral translation or harmonic transposition is to be performed on the audio data and regenerating a highband portion of the audio signal using the filtered lowband audio signal and the high frequency reconstruction metadata in accordance with the flag. The high frequency regeneration is performed as a post-processing operation with a delay of 3010 samples per audio channel.

    PARAMETRIC RECONSTRUCTION OF AUDIO SIGNALS
    7.
    发明申请
    PARAMETRIC RECONSTRUCTION OF AUDIO SIGNALS 审中-公开

    公开(公告)号：US20200302943A1

    公开(公告)日：2020-09-24

    申请号：US16842212

    申请日：2020-04-07

    Applicant: DOLBY INTERNATIONAL AB

    Inventor： Lars VILLEMOES ,  Heidi-Maria LEHTONEN ,  Heiko PURNHAGEN ,  Toni HIRVONEN

    IPC: G10L19/16 ,  G10L19/26 ,  G10L19/008 ,  H04S5/00

    Abstract: An encoding system encodes an N-channel audio signal (X), wherein N≥3, as a single-channel downmix signal (Y) together with dry and wet upmix parameters ({tilde over (C)}, {tilde over (P)}). In a decoding system, a decorrelating section outputs, based on the downmix signal, an (N−1)-channel decorrelated signal (Z); a dry upmix section maps the downmix signal linearly in accordance with dry upmix coefficients (C) determined based on the dry upmix parameters; a wet upmix section populates an intermediate matrix based on the wet upmix parameters and knowing that the intermediate matrix belongs to a predefined matrix class, obtains wet upmix coefficients (P) by multiplying the intermediate matrix by a predefined matrix, and maps the decorrelated signal linearly in accordance with the wet upmix coefficients; and a combining section combines outputs from the upmix sections to obtain a reconstructed signal ({circumflex over (X)}) corresponding to the signal to be reconstructed.

    AUDIO DECODER FOR INTERLEAVING SIGNALS
    8.
    发明申请
    AUDIO DECODER FOR INTERLEAVING SIGNALS 审中-公开

    公开(公告)号：US20200098381A1

    公开(公告)日：2020-03-26

    申请号：US16593830

    申请日：2019-10-04

    Applicant: DOLBY INTERNATIONAL AB

    Inventor： Kristofer KJOERLING ,  Heiko PURNHAGEN ,  Harald MUNDT ,  Karl Jonas ROEDEN ,  Leif SEHLSTROM

    IPC: G10L19/20 ,  G10L19/008 ,  G10L25/18 ,  H04S3/00 ,  G10L19/02 ,  G10L19/16

    Abstract: A method for decoding an encoded audio bitstream in an audio processing system is disclosed. The method includes extracting from the encoded audio bitstream a first waveform-coded signal comprising spectral coefficients corresponding to frequencies up to a first cross-over frequency for a time frame and performing parametric decoding at a second cross-over frequency for the time frame to generate a reconstructed signal. The second cross-over frequency is above the first cross-over frequency and the parametric decoding uses reconstruction parameters derived from the encoded audio bitstream to generate the reconstructed signal. The method also includes extracting from the encoded audio bitstream a second waveform-coded signal comprising spectral coefficients corresponding to a subset of frequencies above the first cross-over frequency for the time frame and interleaving the second waveform-coded signal with the reconstructed signal to produce an interleaved signal for the time frame.

    METHODS AND DEVICES FOR JOINT MULTICHANNEL CODING
    9.
    发明申请
    METHODS AND DEVICES FOR JOINT MULTICHANNEL CODING 审中-公开

    公开(公告)号：US20200066282A1

    公开(公告)日：2020-02-27

    申请号：US16673042

    申请日：2019-11-04

    Applicant: Dolby International AB

    Inventor： Kristofer KJOERLING ,  Harald MUNDT ,  Heiko PURNHAGEN

    IPC: G10L19/008

    Abstract: Encoding and decoding devices for encoding the channels of an audio system having at least four channels are disclosed. The decoding device has a first stereo decoding component which subjects a first pair of input channels to a first stereo decoding, and a second stereo decoding component which subjects a second pair of input channels to a second stereo decoding. The results of the first and second stereo decoding components are crosswise coupled to a third and a fourth stereo decoding component which each performs stereo decoding on one channel resulting from the first stereo decoding component, and one channel resulting from the second stereo decoding component.

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