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21. 发明授权

US08036880B2 Enhancing perceptual performance of SBR and related HFR coding methods by adaptive noise-floor addition and noise substitution limiting 有权
公开(公告)号：US08036880B2
公开(公告)日：2011-10-11
申请号：US12490969
申请日：2009-06-24
申请人： Lars G. Liljeryd , Kristofer Kjoerling , Per Ekstrand , Fredrik Henn
发明人： Lars G. Liljeryd , Kristofer Kjoerling , Per Ekstrand , Fredrik Henn
IPC分类号： G10L19/00
CPC分类号： G10L19/028 , G10L19/035 , G10L19/06 , G10L19/26 , G10L19/265 , G10L21/038 , G10L25/18
摘要： Methods and an apparatus for enhancement of source coding systems utilizing high frequency reconstruction (HFR) are introduced. The problem of insufficient noise contents is addressed in a reconstructed highband, by using Adaptive Noise-floor Addition. New methods are also introduced for enhanced performance by means of limiting unwanted noise, interpolation and smoothing of envelope adjustment amplification factors. The methods and apparatus used are applicable to both speech coding and natural audio coding systems.

22. 发明授权

US08543232B2 Spectral translation/folding in the subband domain 有权
标题翻译：频域翻译/折叠在子带域
公开(公告)号：US08543232B2
公开(公告)日：2013-09-24
申请号：US13460797
申请日：2012-04-30
申请人： Lars Liljeryd , Per Ekstrand , Fredrik Henn , Kristofer Kjoerling
发明人： Lars Liljeryd , Per Ekstrand , Fredrik Henn , Kristofer Kjoerling
IPC分类号： G06F17/00
CPC分类号： G10L19/0208 , G10L19/0017 , G10L19/0204 , G10L19/26 , G10L19/265 , G10L21/038
摘要： The present invention relates to a new method and apparatus for improvement of High Frequency Reconstruction (HFR) techniques using frequency translation or folding or a combination thereof. The proposed invention is applicable to audio source coding systems. This is accomplished by means of frequency translation in the frequency domain with spectral envelope adjustment in the same domain. The proposed invention offers a low-complexity HFR method useful in speech and natural audio coding applications.
摘要翻译：本发明涉及使用频率转换或折叠或其组合来改进高频重建（HFR）技术的新方法和装置。本发明适用于音频源编码系统。这是通过在频域中的频率转换并且在相同的域中进行频谱包络调整来实现的。所提出的发明提供了一种在语音和自然音频编码应用中有用的低复杂度HFR方法。

23. 发明授权

US07191121B2 Efficient spectral envelope coding using variable time/frequency resolution and time/frequency switching 有权
公开(公告)号：US07191121B2
公开(公告)日：2007-03-13
申请号：US11246284
申请日：2005-10-11
申请人： Lars Gustaf Liljeryd , Kristofer Kjörling , Per Ekstrand , Fredrik Henn
发明人： Lars Gustaf Liljeryd , Kristofer Kjörling , Per Ekstrand , Fredrik Henn
IPC分类号： G10L21/00
CPC分类号： G10L19/06 , G10L19/0208 , G10L19/022 , G10L19/035 , G10L21/038 , G10L25/18
摘要： The present invention provides a new method and an apparatus for spectral envelope encoding. The invention teaches how to perform and signal compactly a time/frequency mapping of the envelope representation, and further, encode the spectral envelope data efficiently using adaptive time/frequency directional coding. The method is applicable to both natural audio coding and speech coding systems and is especially suited for coders using SBR [WO 98/57436] or other high frequency reconstruction methods.

24. 发明授权

US07181389B2 Efficient spectral envelope coding using variable time/frequency resolution and time/frequency switching 有权
标题翻译：使用可变时间/频率分辨率和时间/频率切换的有效频谱包络编码
公开(公告)号：US07181389B2
公开(公告)日：2007-02-20
申请号：US11246283
申请日：2005-10-11
申请人： Lars Gustaf Liljeryd , Kristofer Kjörling , Per Ekstrand , Fredrik Henn
发明人： Lars Gustaf Liljeryd , Kristofer Kjörling , Per Ekstrand , Fredrik Henn
IPC分类号： G10L21/00
CPC分类号： G10L19/06 , G10L19/0208 , G10L19/022 , G10L19/035 , G10L21/038 , G10L25/18
摘要： The present invention provides a new method and an apparatus for spectral envelope encoding. The invention teaches how to perform and signal compactly a time/frequency mapping of the envelope representation, and further, encode the spectral envelope data efficiently using adaptive time/frequency directional coding. The method is applicable to both natural audio coding and speech coding systems and is especially suited for coders using SBR [WO 98/57436] or other high frequency reconstruction methods.
摘要翻译：本发明提供了一种用于频谱包络编码的新方法和装置。本发明教导了如何执行和紧凑地发送包络表示的时间/频率映射，并且还使用自适应时间/频率方向编码有效地对频谱包络数据进行编码。该方法适用于自然音频编码和语音编码系统，并且特别适用于使用SBR [WO 98/57436]或其他高频重建方法的编码器。

25. 发明授权

US08036881B2 Enhancing perceptual performance of SBR and related HFR coding methods by adaptive noise-floor addition and noise substitution limiting 有权
标题翻译：通过自适应噪声底板加法和噪声替换限制来增强SBR和相关HFR编码方法的感知性能
公开(公告)号：US08036881B2
公开(公告)日：2011-10-11
申请号：US12490990
申请日：2009-06-24
申请人： Lars G. Liljeryd , Kristofer Kjoerling , Per Ekstrand , Fredrik Henn
发明人： Lars G. Liljeryd , Kristofer Kjoerling , Per Ekstrand , Fredrik Henn
IPC分类号： G10L19/00
CPC分类号： G10L19/028 , G10L19/035 , G10L19/06 , G10L19/26 , G10L19/265 , G10L21/038 , G10L25/18
摘要： Methods and an apparatus for enhancement of source coding systems utilizing high frequency reconstruction (HFR) are introduced. The problem of insufficient noise contents is addressed in a reconstructed highband, by using Adaptive Noise-floor Addition. New methods are also introduced for enhanced performance by means of limiting unwanted noise, interpolation and smoothing of envelope adjustment amplification factors. The methods and apparatus used are applicable to both speech coding and natural audio coding systems.
摘要翻译：引入了利用高频重建（HFR）来增强源编码系统的方法和装置。通过使用自适应噪声层加法，在重构的高频带中解决噪声含量不足的问题。还引入了新的方法，通过限制不需要的噪声，包络调整放大因子的内插和平滑来增强性能。所使用的方法和装置适用于语音编码和自然音频编码系统。

26. 发明申请

US20090319280A1 Enhancing Perceptual Performance of SBR and Related HFR Coding Methods by Adaptive Noise-Floor Addition and Noise Substitution Limiting 有权
标题翻译：通过自适应噪声增加和噪声替代限制提高SBR和相关HFR编码方法的感知性能
公开(公告)号：US20090319280A1
公开(公告)日：2009-12-24
申请号：US12491001
申请日：2009-06-24
申请人： Lars G. Liljeryd , Kristofer Kjoerling , Per Ekstrand , Fredrik Henn
发明人： Lars G. Liljeryd , Kristofer Kjoerling , Per Ekstrand , Fredrik Henn
IPC分类号： G10L21/00
CPC分类号： G10L19/028 , G10L19/035 , G10L19/06 , G10L19/26 , G10L19/265 , G10L21/038 , G10L25/18
摘要： Methods and an apparatus for enhancement of source coding systems utilizing high frequency reconstruction (HFR) are introduced. The problem of insufficient noise contents is addressed in a reconstructed highband, by using Adaptive Noise-floor Addition. New methods are also introduced for enhanced performance by means of limiting unwanted noise, interpolation and smoothing of envelope adjustment amplification factors. The methods and apparatus used are applicable to both speech coding and natural audio coding systems.
摘要翻译：引入了利用高频重建（HFR）来增强源编码系统的方法和装置。通过使用自适应噪声层加法，在重构的高频带中解决噪声含量不足的问题。还引入了新的方法，通过限制不需要的噪声，包络调整放大因子的内插和平滑来增强性能。所使用的方法和装置适用于语音编码和自然音频编码系统。

27. 发明申请

US20090319259A1 Enhancing Perceptual Performance of SBR and Related HFR Coding Methods by Adaptive Noise-Floor Addition and Noise Substitution Limiting 有权
公开(公告)号：US20090319259A1
公开(公告)日：2009-12-24
申请号：US12490969
申请日：2009-06-24
申请人： Lars G. Liljeryd , Kristofer Kjoerling , Per Ekstrand , Fredrik Henn
发明人： Lars G. Liljeryd , Kristofer Kjoerling , Per Ekstrand , Fredrik Henn
IPC分类号： G10L19/00
CPC分类号： G10L19/028 , G10L19/035 , G10L19/06 , G10L19/26 , G10L19/265 , G10L21/038 , G10L25/18
摘要： Methods and an apparatus for enhancement of source coding systems utilizing high frequency reconstruction (HFR) are introduced. The problem of insufficient noise contents is addressed in a reconstructed highband, by using Adaptive Noise-floor Addition. New methods are also introduced for enhanced performance by means of limiting unwanted noise, interpolation and smoothing of envelope adjustment amplification factors. The methods and apparatus used are applicable to both speech coding and natural audio coding systems.

28. 发明授权

US09159337B2 Apparatus and method for generating a high frequency audio signal using adaptive oversampling 有权
标题翻译：使用自适应过采样来生成高频音频信号的装置和方法
公开(公告)号：US09159337B2
公开(公告)日：2015-10-13
申请号：US13503248
申请日：2010-05-25
申请人： Lars Villemoes , Per Ekstrand , Sascha Disch , Frederik Nagel , Stephan Wilde
发明人： Lars Villemoes , Per Ekstrand , Sascha Disch , Frederik Nagel , Stephan Wilde
IPC分类号： H04R3/04 , G10L21/038 , G10L19/025
CPC分类号： G10L21/038 , G10L19/025
摘要： 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.
摘要翻译：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。

29. 发明授权

US08886346B2 Oversampling in a combined transposer filter bank 有权
标题翻译：组合式转换器滤波器组中的过采样
公开(公告)号：US08886346B2
公开(公告)日：2014-11-11
申请号：US13499893
申请日：2010-05-25
申请人： Lars Villemoes , Per Ekstrand
发明人： Lars Villemoes , Per Ekstrand
IPC分类号： G06F17/00 , G10L21/038
CPC分类号： G10L21/038 , G10L19/0204 , G10L19/022 , G10L19/265
摘要： 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.
摘要翻译：本发明涉及音频信号的编码，特别涉及包括频域谐波转移器的高频重构方法。描述了用于从信号的低频分量产生信号的高频分量的系统和方法。该系统包括分析滤波器组（501），其包括频率分辨率为＆Dgr; f的分析变换单元（601）和具有DA持续时间的分析窗口（611）; 所述分析滤波器组（501）被配置为从所述信号的低频分量提供一组分析子带信号; 非线性处理单元（502,650），被配置为基于所述一组分析子带信号来确定一组合成子带信号，其中所述一组分析子带信号的所述部分被相移一个换位阶数T; f）具有频率分辨率为Q＆Dgr; f的合成变换单元（602）的合成滤波器组（504）和具有持续时间Ds的合成窗口（612）; 所述合成滤波器组（504）被配置为从所述一组合成子带信号中产生所述信号的高频分量; 其中Q是具有Q≥1且小于置换次数T的频率分辨率因子; 并且其中基于频率分辨率因子Q选择频率分辨率＆Dgr; f的乘积值和分析滤波器组的持续时间DA。

30. 发明授权

US08443026B2 Partially complex modulated filter bank 有权
标题翻译：部分复杂调制滤波器组
公开(公告)号：US08443026B2
公开(公告)日：2013-05-14
申请号：US12687801
申请日：2010-01-14
申请人： Per Ekstrand , Lars Villemoes , Heiko Purnhagen
发明人： Per Ekstrand , Lars Villemoes , Heiko Purnhagen
IPC分类号： G06F17/10
CPC分类号： G10L19/008 , G10L19/0208
摘要： 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.
摘要翻译：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。

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