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    Apparatus and method applying adaptive spectral whitening in a high-frequency reconstruction coding system
    51.
    发明申请
    Apparatus and method applying adaptive spectral whitening in a high-frequency reconstruction coding system 有权
    在高频重建编码系统中应用自适应频谱白化的装置和方法

    公开(公告)号：US20060036432A1

    公开(公告)日：2006-02-16

    申请号：US11247176

    申请日：2005-10-12

    Applicant: Kristofer Kjorling ,  Per Ekstrand ,  Fredrik Henn ,  Lars Villemoes

    Inventor： Kristofer Kjorling ,  Per Ekstrand ,  Fredrik Henn ,  Lars Villemoes

    IPC: G10L11/04

    CPC classification number: G10L21/038

    Abstract: The present invention proposes a new method and a new apparatus for enhancement of audio source coding systems utilising high frequency reconstruction (HFR). It utilises adaptive filtering to reduce artifacts due to different tonal characteristics in different frequency ranges of an audio signal upon which HFR is performed. The present invention is applicable to both speech coding and natural audio coding systems.

    Abstract translation: 本发明提出了一种利用高频重构（HFR）来增强音频源编码系统的新方法和新装置。 它利用自适应滤波来减少因执行HFR的音频信号的不同频率范围内的不同音调特性引起的伪影。 本发明适用于语音编码和自然音频编码系统。

    Efficient combined harmonic transposition
    52.
    发明授权
    Efficient combined harmonic transposition 有权
    有效的组合谐波转置

    公开(公告)号：US08983852B2

    公开(公告)日：2015-03-17

    申请号：US13321910

    申请日：2010-05-25

    Applicant: Per Ekstrand ,  Lars Villemoes ,  Per Hedelin

    Inventor： Per Ekstrand ,  Lars Villemoes ,  Per Hedelin

    IPC: G10L19/00

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

    Abstract translation: 本文件涉及利用用于高频重构（HFR）的谐波转置方法的音频编码系统以及数字效果处理器，例如， 所谓的兴奋剂，其中谐波失真的产生增加处理信号的亮度。 尤其是; 描述了一种被配置为从信号的低频分量产生信号的高频分量的系统。该系统可以包括分析滤波器组（501），其被配置为提供来自所述信号的低频分量的一组分析子带信号 信号; 其中所述一组分析子带信号包括至少两个分析子带信号; 其中所述分析滤波器组具有频率分辨率＆Dgr; f，所述系统还包括非线性处理单元（502），其被配置为使用转置顺序P从所述一组分析子带信号中确定一组合成子带信号; 其中所述合成子带信号集合包括所述一组分析子带信号的一部分，所述分析子带信号的相位偏移量是从所述置换顺序P导出的量; 以及合成滤波器组（504），被配置为从所述合成子带信号的集合生成所述信号的高频分量; 其中所述合成滤波器组（504）具有F＆Dgr; f的频率分辨率; F为分辨率因子，F≥1; 其中转置次数P与分辨率因子F不同

    Method for determining inverse filter from critically banded impulse response data
    53.
    发明授权
    Method for determining inverse filter from critically banded impulse response data 有权
    用于从严格条带脉冲响应数据确定逆滤波器的方法

    公开(公告)号：US08761407B2

    公开(公告)日：2014-06-24

    申请号：US13145758

    申请日：2010-01-13

    Applicant: C Phillip Brown ,  Per Ekstrand ,  Alan Seefeldt

    Inventor： C Phillip Brown ,  Per Ekstrand ,  Alan Seefeldt

    IPC: H04R29/00 ,  H04N11/00

    CPC classification number: H04R29/001 ,  H04R3/04 ,  H04R2430/03

    Abstract: A method for determining an inverse filter for altering the frequency response of a loudspeaker so that with the inverse filter applied in the loudspeaker's signal path the inverse-filtered loudspeaker output has a target frequency response, and optionally also applying the inverse filter in the signal path, and a system configured (e.g., a general or special purpose processor programmed and configured) to determine an inverse filter. In some embodiments, the inverse filter corrects the magnitude of the loudspeaker's output. In other embodiments, the inverse filter corrects both the magnitude and phase of the loudspeaker's output. In some embodiments, the inverse filter is determined in the frequency domain by applying eigenfilter theory or minimizing a mean square error expression by solving a linear equation system.

    Abstract translation: 一种用于确定用于改变扬声器的频率响应的逆滤波器的方法，使得利用在扬声器信号路径中应用的反相滤波器，经滤波的扬声器输出具有目标频率响应，并且还可选地还在信号路径中应用逆滤波器 以及配置（例如，编程和配置的通用或专用处理器）以确定逆滤波器的系统。 在一些实施例中，逆滤波器校正扬声器输出的幅度。 在其他实施例中，逆滤波器校正扬声器的输出的幅度和相位。 在一些实施例中，通过应用特征滤波器理论或通过求解线性方程系统来最小化均方误差表达式，在频域中确定逆滤波器。

    APPARATUS AND METHOD FOR GENERATING A HIGH FREQUENCY AUDIO SIGNAL USING ADAPTIVE OVERSAMPLING
    54.
    发明申请
    APPARATUS AND METHOD FOR GENERATING A HIGH FREQUENCY AUDIO SIGNAL USING ADAPTIVE OVERSAMPLING 有权
    使用自适应超声波产生高频音频信号的装置和方法

    公开(公告)号：US20120281859A1

    公开(公告)日：2012-11-08

    申请号：US13503248

    申请日：2010-05-25

    Applicant: Lars Villemoes ,  Per Ekstrand ,  Sascha Disch ,  Frederik Nagel ,  Stephan Wilde

    Inventor： Lars Villemoes ,  Per Ekstrand ,  Sascha Disch ,  Frederik Nagel ,  Stephan Wilde

    IPC: H03G5/00

    CPC classification number: G10L21/038 ,  G10L19/025

    Abstract: An apparatus for generating a high frequency audio signal that includes an analyzer for analyzing an input signal to determine a transient information adaptively. Additionally a spectral converter is provided for converting the input signal into an input spectral representation. A spectral processor processes the input spectral representation to generate a processed spectral representation including values for higher frequencies than the input spectral representation. A time converter is configured for converting the processed spectral representation to a time representation, wherein the spectral converter or the time converter are controllable to perform a frequency domain oversampling for the first portion of the input signal having the transient information associated and to not perform the frequency domain oversampling for the second portion of the input signal not having the associated transient information.

    Abstract translation: 一种用于产生高频音频信号的装置，包括用于分析输入信号的分析器，以自适应地确定瞬时信息。 另外，提供了用于将输入信号转换为输入频谱表示的频谱转换器。 频谱处理器处理输入频谱表示以产生包括比输入频谱表示更高频率的值的经处理的频谱表示。 时间转换器被配置为将经处理的频谱表示转换为时间表示，其中频谱转换器或时间转换器是可控制的，以对具有相关联的瞬态信息的输入信号的第一部分执行频域过采样，并且不执行 输入信号的第二部分不具有相关联的瞬态信息的频域过采样。

    Efficient Combined Harmonic Transposition
    55.
    发明申请
    Efficient Combined Harmonic Transposition 有权
    有效的组合谐波转置

    公开(公告)号：US20120065983A1

    公开(公告)日：2012-03-15

    申请号：US13321910

    申请日：2010-05-25

    Applicant: Per Ekstrand ,  Lars Villemoes ,  Per Hedelin

    Inventor： Per Ekstrand ,  Lars Villemoes ,  Per Hedelin

    IPC: G10L19/00

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

    Abstract translation: 本文件涉及利用用于高频重构（HFR）的谐波转置方法的音频编码系统以及数字效果处理器，例如， 所谓的兴奋剂，其中谐波失真的产生增加处理信号的亮度。 尤其是; 描述了一种被配置为从信号的低频分量产生信号的高频分量的系统。该系统可以包括分析滤波器组（501），其被配置为提供来自所述信号的低频分量的一组分析子带信号 信号; 其中所述一组分析子带信号包括至少两个分析子带信号; 其中所述分析滤波器组具有频率分辨率＆Dgr; f，所述系统还包括非线性处理单元（502），其被配置为使用转置顺序P从所述一组分析子带信号中确定一组合成子带信号; 其中所述合成子带信号集合包括所述一组分析子带信号的一部分，所述分析子带信号的相位偏移量是从所述置换顺序P导出的量; 以及合成滤波器组（504），被配置为从所述合成子带信号的集合生成所述信号的高频分量; 其中所述合成滤波器组（504）具有F＆Dgr; f的频率分辨率; F为分辨率因子，F≥1; 其中转置次数P与分辨率因子F不同

    Partially Complex Modulated Filter Bank
    58.
    发明申请
    Partially Complex Modulated Filter Bank 有权
    部分复杂调制滤波器组

    公开(公告)号：US20110106541A1

    公开(公告)日：2011-05-05

    申请号：US12716739

    申请日：2010-03-03

    Applicant: Per Ekstrand ,  Lars Villemoes ,  Heiko Purnhagen

    Inventor： Per Ekstrand ,  Lars Villemoes ,  Heiko Purnhagen

    IPC: G10L19/00

    CPC classification number: G10L19/0208

    Abstract: An apparatus for processing a plurality of real-valued subband signals using a first real-valued subband signal and a second real-valued subband signal to provide at least a complex-valued subband signal comprises a multiband filter for providing an intermediate real-valued subband signal and a calculator for providing the complex-valued subband signal by combining a real-valued subband signal from the plurality of real-valued subband signals and the intermediate subband signal.

    Abstract translation: 一种用于使用第一实值子带信号和第二实值子带信号来处理多个实值子带信号以提供至少复值子带信号的装置包括多频带滤波器，用于提供中间实值子带 信号和用于通过组合来自多个实值子带信号和中间子带信号的实值子带信号来提供复值子带信号的计算器。

    Partially Complex Modulated Filter Bank
    59.
    发明申请
    Partially Complex Modulated Filter Bank 有权

    公开(公告)号：US20100169104A1

    公开(公告)日：2010-07-01

    申请号：US12716777

    申请日：2010-03-03

    Applicant: Per Ekstrand ,  Lars Villemoes ,  Heiko Purnhagen

    Inventor： Per Ekstrand ,  Lars Villemoes ,  Heiko Purnhagen

    IPC: G06F17/00

    CPC classification number: G10L19/008 ,  G10L19/0208

    Abstract: An apparatus for processing a plurality of real-valued subband signals using a first real-valued subband signal and a second real-valued subband signal to provide at least a complex-valued subband signal comprises a multiband filter for providing an intermediate real-valued subband signal and a calculator for providing the complex-valued subband signal by combining a real-valued subband signal from the plurality of real-valued subband signals and the intermediate subband signal.

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