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    Backward-compatible integration of harmonic transposer for high frequency reconstruction of audio signals
    72.
    发明授权
    Backward-compatible integration of harmonic transposer for high frequency reconstruction of audio signals 有权

    公开(公告)号：US12175993B2

    公开(公告)日：2024-12-24

    申请号：US18677047

    申请日：2024-05-29

    Applicant: DOLBY INTERNATIONAL AB

    Inventor： Lars Villemoes ,  Heiko Purnhagen ,  Per Ekstrand

    IPC: G10L19/00 ,  G10L19/008 ,  G10L19/24 ,  G10L19/26

    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.

    Efficient combined harmonic transposition
    77.
    发明授权
    Efficient combined harmonic transposition 有权

    公开(公告)号：US11935508B2

    公开(公告)日：2024-03-19

    申请号：US18194414

    申请日：2023-03-31

    Applicant: DOLBY INTERNATIONAL AB

    Inventor： Per Ekstrand ,  Lars Villemoes ,  Per Hedelin

    IPC: G10L21/038 ,  G10H1/00 ,  G10H1/12 ,  G10L19/26 ,  G10L21/0388

    CPC classification number: G10H1/0091 ,  G10H1/125 ,  G10L19/265 ,  G10L21/038 ,  G10H2210/311 ,  G10L21/0388

    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 Δf. The system further comprises a nonlinear processing unit (502) configured to determine a set of synthesis subband signals from the set of analysis subband signals using a transposition order P; wherein the set of synthesis subband signals comprises a portion of the set of analysis subband signals phase shifted by an amount derived from the transposition order P; and a synthesis filter bank (504) configured to generate the high frequency component of the signal from the set of synthesis subband signals; wherein the synthesis filter bank (504) has a frequency resolution of FΔf; with F being a resolution factor, with F≥1; wherein the transposition order P is different from the resolution factor F.

    Integration of high frequency reconstruction techniques with reduced post-processing delay
    78.
    发明授权
    Integration of high frequency reconstruction techniques with reduced post-processing delay 有权

    公开(公告)号：US11908486B2

    公开(公告)日：2024-02-20

    申请号：US18157644

    申请日：2023-01-20

    Applicant: DOLBY INTERNATIONAL AB

    Inventor： Kristofer Kjoerling ,  Lars Villemoes ,  Heiko Purnhagen ,  Per Ekstrand

    IPC: G10L19/18 ,  G10L21/038

    CPC classification number: 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.

    Integration of high frequency audio reconstruction techniques
    79.
    发明授权
    Integration of high frequency audio reconstruction techniques 有权

    公开(公告)号：US11862185B2

    公开(公告)日：2024-01-02

    申请号：US18113418

    申请日：2023-02-23

    Applicant: Dolby International AB

    Inventor： Kristofer Kjoerling ,  Lars Villemoes ,  Heiko Purnhagen ,  Per Ekstrand

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

    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.

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