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    Audio signal decoder, audio signal encoder, method for decoding an audio signal, method for encoding an audio signal and computer program using a pitch-dependent adaptation of a coding context
    1.
    发明授权
    Audio signal decoder, audio signal encoder, method for decoding an audio signal, method for encoding an audio signal and computer program using a pitch-dependent adaptation of a coding context 有权
    音频信号解码器，音频信号编码器，用于解码音频信号的方法，用于对音频信号进行编码的方法和使用编码上下文的音调依赖性调整的计算机程序

    公开(公告)号：US09524726B2

    公开(公告)日：2016-12-20

    申请号：US13608980

    申请日：2012-09-10

    申请人： Stefan Bayer ,  Tom Baeckstroem ,  Ralf Geiger ,  Bernd Edler ,  Sascha Disch ,  Lars Villemoes

    发明人： Stefan Bayer ,  Tom Baeckstroem ,  Ralf Geiger ,  Bernd Edler ,  Sascha Disch ,  Lars Villemoes

    IPC分类号： G10L19/14 ,  G10L19/022 ,  G10L19/02 ,  G10L25/90

    CPC分类号： G10L19/022 ,  G10L19/0212 ,  G10L25/90

    摘要： An audio signal decoder includes a context-based spectral value decoder configured to decode a codeword describing one or more spectral values or at least a portion of a number representation thereof in dependence on a context state. The audio signal decoder also includes a context state determinator configured to determine a current context state in dependence on one or more previously decoded spectral values and a time warping frequency-domain-to-time-domain converter configured to provide a time-warped time-domain representation of a given audio frame on the basis of a set of decoded spectral values provided by the context-based spectral value decoder and in dependence on the time warp information. The context-state determinator is configured to adapt the determination of the context state to a change of a fundamental frequency between subsequent audio frames. An audio signal encoder applies a comparable concept.

    摘要翻译： 音频信号解码器包括基于上下文的频谱值解码器，其被配置为根据上下文状态来解码描述一个或多个频谱值的码字或其数字表示的至少一部分。 音频信号解码器还包括上下文状态确定器，其被配置为根据一个或多个先前解码的频谱值确定当前上下文状态，以及时间扭曲频域 - 时域转换器，被配置为提供时间扭曲的时域 - 基于由基于上下文的频谱值解码器提供的解码频谱值的集合并且依赖于时间扭曲信息，给定音频帧的域表示。 上下文状态确定器被配置为使上下文状态的确定适应随后的音频帧之间的基频的改变。 音频信号编码器应用可比较的概念。

    Cross product enhanced harmonic transposition
    3.
    发明授权
    Cross product enhanced harmonic transposition 有权
    交叉乘积增强谐波转置

    公开(公告)号：US08818541B2

    公开(公告)日：2014-08-26

    申请号：US13144346

    申请日：2010-01-15

    申请人： Lars Villemoes ,  Per Hedelin

    发明人： Lars Villemoes ,  Per Hedelin

    IPC分类号： G10L19/02 ,  G10L21/0388

    CPC分类号： G10L19/265 ,  G10L19/02 ,  G10L21/0388

    摘要： The present invention relates to audio coding systems which make use of a harmonic transposition method for high frequency reconstruction (HFR). A system and a 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 providing a plurality of analysis subband signals of the low frequency component of the signal. It also comprises a non-linear processing unit to generate a synthesis subband signal with a synthesis frequency by modifying the phase of a first and a second of the plurality of analysis subband signals and by combining the phase-modified analysis subband signals. Finally, it comprises a synthesis filter bank for generating the high frequency component of the signal from the synthesis subband signal.

    摘要翻译： 本发明涉及利用高频重构（HFR）的谐波转置方法的音频编码系统。 描述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。 该系统包括提供信号的低频分量的多个分析子带信号的分析滤波器组。 它还包括非线性处理单元，用于通过修改多个分析子带信号中的第一和第二分析子相位的相位并通过组合相位修正的分析子带信号来产生具有合成频率的合成子带信号。 最后，它包括一个合成滤波器组，用于从合成子带信号产生信号的高频分量。

    AUDIO SIGNAL DECODER, AUDIO SIGNAL ENCODER, METHODS AND COMPUTER PROGRAM USING A SAMPLING RATE DEPENDENT TIME-WARP CONTOUR ENCODING
    7.
    发明申请
    AUDIO SIGNAL DECODER, AUDIO SIGNAL ENCODER, METHODS AND COMPUTER PROGRAM USING A SAMPLING RATE DEPENDENT TIME-WARP CONTOUR ENCODING 有权
    音频信号解码器，音频信号编码器，使用采样速率的方法和计算机程序依赖于时间波形编码

    公开(公告)号：US20130073296A1

    公开(公告)日：2013-03-21

    申请号：US13604869

    申请日：2012-09-06

    申请人： Stefan Bayer ,  Tom Baeckstroem ,  Ralf Reiger ,  Bernd Edler ,  Sascha Disch ,  Lars Villemoes

    发明人： Stefan Bayer ,  Tom Baeckstroem ,  Ralf Reiger ,  Bernd Edler ,  Sascha Disch ,  Lars Villemoes

    IPC分类号： G10L19/00

    CPC分类号： G10L19/022 ,  G10L19/0212 ,  G10L25/90

    摘要： An audio signal decoder configured to provide a decoded audio signal representation on the basis of an encoded audio signal representation including a sampling frequency information, an encoded time warp information and an encoded spectrum representation includes a time warp calculator and a warp decoder. The time warp calculator is configured to adapt a mapping rule for mapping codewords of the encoded time warp information onto decoded time warp values describing the decoded time warp information in dependence on the sampling frequency information. The warp decoder is configured to provide the decoded audio signal representation on the basis of the encoded spectrum representation and in dependence on the decoded time warp information.

    摘要翻译： 音频信号解码器被配置为基于包括采样频率信息，编码时间扭曲信息和编码频谱表示的编码音频信号表示来提供解码音频信号表示，包括时间扭曲计算器和扭曲解码器。 时间扭曲计算器被配置成适应用于将编码的时间扭曲信息的码字映射到根据采样频率信息描述解码的时间扭曲信息的解码的时间扭曲值的映射规则。 翘曲解码器被配置为基于编码的频谱表示并且依赖于解码的时间扭曲信息来提供解码的音频信号表示。