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    INTEGRATION OF HIGH FREQUENCY RECONSTRUCTION TECHNIQUES WITH REDUCED POST-PROCESSING DELAY
    1.
    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.

    OVERSAMPLING IN A COMBINED TRANSPOSER FILTERBANK
    2.
    发明公开
    OVERSAMPLING IN A COMBINED TRANSPOSER FILTERBANK 审中-公开

    公开(公告)号：US20240271217A1

    公开(公告)日：2024-08-15

    申请号：US18637814

    申请日：2024-04-17

    Applicant: Dolby International AB

    Inventor： Lars VILLEMOES ,  Per EKSTRAND

    IPC: C12Q1/6883 ,  G10L19/02 ,  G10L19/022 ,  G10L19/26 ,  G10L21/038

    CPC classification number: C12Q1/6883 ,  G10L19/0204 ,  G10L19/022 ,  G10L19/265 ,  G10L21/038 ,  C12Q2600/118 ,  C12Q2600/156

    Abstract: The present invention relates to coding of audio signals, and in particular to high frequency reconstruction methods including a frequency domain harmonic transposer. A system and 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 (501) comprising an analysis transformation unit (601) having a frequency resolution of Δf; and an analysis window (611) having a duration of DA; the analysis filter bank (501) being configured to provide a set of analysis subband signals from the low frequency component of the signal; a nonlinear processing unit (502, 650) configured to determine a set of synthesis subband signals based on a portion of the set of analysis subband signals, wherein the portion of the set of analysis subband signals is phase shifted by a transposition order T; and a synthesis filter bank (504) comprising a synthesis transformation unit (602) having a frequency resolution of QΔf; and a synthesis window (612) having a duration of DS; the synthesis filter bank (504) being configured to generate the high frequency component of the signal from the set of synthesis subband signals; wherein Q is a frequency resolution factor with Q≥1 and smaller than the transposition order T; and wherein the value of the product of the frequency resolution Δf and the duration DA of the analysis filter bank is selected based on the frequency resolution factor Q.

    INTEGRATION OF HIGH FREQUENCY AUDIO RECONSTRUCTION TECHNIQUES
    3.
    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.

    Harmonic Transposition in an Audio Coding Method and System
    5.
    发明申请
    Harmonic Transposition in an Audio Coding Method and System 有权

    公开(公告)号：US20210383817A1

    公开(公告)日：2021-12-09

    申请号：US17409592

    申请日：2021-08-23

    Applicant: Dolby International AB

    Inventor： Per EKSTRAND ,  Lars VILLEMOES

    IPC: G10L19/022 ,  G10L19/24 ,  G10L21/038 ,  G10L21/04 ,  G10L19/02

    Abstract: The present invention relates to transposing signals in time and/or frequency and in particular to coding of audio signals. More particular, the present invention relates to high frequency reconstruction (HFR) methods including a frequency domain harmonic transposer. A method and system for generating a transposed output signal from an input signal using a transposition factor T is described. The system comprises an analysis window of length La, extracting a frame of the input signal, and an analysis transformation unit of order M transforming the samples into M complex coefficients. M is a function of the transposition factor T. The system further comprises a nonlinear processing unit altering the phase of the complex coefficients by using the transposition factor T, a synthesis transformation unit of order M transforming the altered coefficients into M altered samples, and a synthesis window of length Ls, generating a frame of the output signal.

    Oversampling in a Combined Transposer Filter Bank
    6.
    发明申请
    Oversampling in a Combined Transposer Filter Bank 有权

    公开(公告)号：US20210269880A1

    公开(公告)日：2021-09-02

    申请号：US17201107

    申请日：2021-03-15

    Applicant: Dolby International AB

    Inventor： Lars VILLEMOES ,  Per EKSTRAND

    IPC: C12Q1/6883 ,  G10L21/038 ,  G10L19/26 ,  G10L19/02 ,  G10L19/022

    Abstract: The present invention relates to coding of audio signals, and in particular to high frequency reconstruction methods including a frequency domain harmonic transposer. A system and 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 (501) comprising an analysis transformation unit (601) having a frequency resolution of Δf; and an analysis window (611) having a duration of DA; the analysis filter bank (501) being configured to provide a set of analysis subband signals from the low frequency component of the signal; a nonlinear processing unit (502, 650) configured to determine a set of synthesis subband signals based on a portion of the set of analysis subband signals, wherein the portion of the set of analysis subband signals is phase shifted by a transposition order T; and a synthesis filter bank (504) comprising a synthesis transformation unit (602) having a frequency resolution of QΔf; and a synthesis window (612) having a duration of DS; the synthesis filter bank (504) being configured to generate the high frequency component of the signal from the set of synthesis subband signals; wherein Q is a frequency resolution factor with Q≥1 and smaller than the transposition order T; and wherein the value of the product of the frequency resolution Δf and the duration DA of the analysis filter bank is selected based on the frequency resolution factor Q.

    Frequency Band Table Design for High Frequency Reconstruction Algorithms
    8.
    发明申请
    Frequency Band Table Design for High Frequency Reconstruction Algorithms 有权
    高频重构算法的频带表设计

    公开(公告)号：US20160210970A1

    公开(公告)日：2016-07-21

    申请号：US14914524

    申请日：2014-08-11

    Applicant: DOLBY INTERNATIONAL AB

    Inventor： Per EKSTRAND ,  Kristofer KJOERLING

    IPC: G10L19/002 ,  G10L19/02

    CPC classification number: G10L19/002 ,  G10L19/0204 ,  G10L19/0208 ,  G10L21/0388 ,  G10L2019/0001

    Abstract: The present document relates to audio encoding and decoding. In particular, the present document relates to audio coding schemes which make use of high frequency reconstruction (HFR) methods. A system configured to determine a master scale factor band table of a highband signal (105) of an audio signal is described. The highband signal (105) is to be generated from a lowband signal (101) of the audio signal using a high frequency reconstruction (HFR) scheme. The master scale factor band table is indicative of a frequency resolution of a spectral envelope of the highband signal (105).

    Abstract translation: 本文件涉及音频编码和解码。 特别地，本文件涉及利用高频重构（HFR）方法的音频编码方案。 描述了被配置为确定音频信号的高频带信号（105）的主比例因子带表的系统。 高频信号（105）将使用高频重构（HFR）方案从音频信号的低频带信号（101）生成。 主比例因子带表表示高频信号（105）的频谱包络的​​频率分辨率。

    INTEGRATION OF HIGH FREQUENCY AUDIO RECONSTRUCTION TECHNIQUES
    9.
    发明申请
    INTEGRATION OF HIGH FREQUENCY AUDIO RECONSTRUCTION TECHNIQUES 有权

    公开(公告)号：US20250118325A1

    公开(公告)日：2025-04-10

    申请号：US18982152

    申请日：2024-12-16

    Applicant: DOLBY INTERNATIONAL AB

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

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

    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.

    OVERSAMPLING IN A COMBINED TRANSPOSER FILTERBANK
    10.
    发明公开
    OVERSAMPLING IN A COMBINED TRANSPOSER FILTERBANK 审中-公开

    公开(公告)号：US20240294987A1

    公开(公告)日：2024-09-05

    申请号：US18637832

    申请日：2024-04-17

    Applicant: Dolby International AB

    Inventor： Lars VILLEMOES ,  Per EKSTRAND

    IPC: C12Q1/6883 ,  G10L19/02 ,  G10L19/022 ,  G10L19/26 ,  G10L21/038

    CPC classification number: C12Q1/6883 ,  G10L19/0204 ,  G10L19/022 ,  G10L19/265 ,  G10L21/038 ,  C12Q2600/118 ,  C12Q2600/156

    Abstract: The present invention relates to coding of audio signals, and in particular to high frequency reconstruction methods including a frequency domain harmonic transposer. A system and 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 (501) comprising an analysis transformation unit (601) having a frequency resolution of Δf; and an analysis window (611) having a duration of DA; the analysis filter bank (501) being configured to provide a set of analysis subband signals from the low frequency component of the signal; a nonlinear processing unit (502, 650) configured to determine a set of synthesis subband signals based on a portion of the set of analysis subband signals, wherein the portion of the set of analysis subband signals is phase shifted by a transposition order T; and a synthesis filter bank (504) comprising a synthesis transformation unit (602) having a frequency resolution of QΔf; and a synthesis window (612) having a duration of DS; the synthesis filter bank (504) being configured to generate the high frequency component of the signal from the set of synthesis subband signals; wherein Q is a frequency resolution factor with Q≥1 and smaller than the transposition order T; and wherein the value of the product of the frequency resolution Δf and the duration DA of the analysis filter bank is selected based on the frequency resolution factor Q.

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