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    An apparatus and a method for encoding an audio signal
    2.
    发明公开
    An apparatus and a method for encoding an audio signal 有权
    装置和方法，用于编码的声音信号，

    公开(公告)号：EP2352147A3

    公开(公告)日：2012-05-30

    申请号：EP11162255.1

    申请日：2009-06-23

    申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

    发明人： Neuendorf, Max ,  Krämer, Ulrich ,  Grill, Bernhard ,  Multrus, Markus ,  Popp, Harald ,  Rettelbach, Nikolaus ,  Nagel, Frederik ,  Lohwasser, Markus ,  Gayer, Marc ,  Jander, Manuel ,  Bacigalupo, Virgilio

    IPC分类号： G10L19/14 ,  G10L21/02

    CPC分类号： G10L21/038 ,  G10L19/008 ,  G10L19/0212 ,  G10L19/022 ,  G10L19/20 ,  G10L21/04

    摘要： An apparatus for decoding (100) an encoded audio signal (102), the encoded audio signal (102) comprising a first portion (104a) encoded in accordance with a first encoding algorithm, a second portion (104b) encoded in accordance with a second encoding algorithm, BWE parameters (106) for the first portion (104a) and the second portion (104b) and a coding mode information (108) indicating a first decoding algorithm or a second decoding algorithm, comprises a first decoder (110a), a second decoder (110b), a BWE module (130) and a controller (140). The first decoder (110a) decodes the first portion (104a) in accordance with the first decoding algorithm for a first time portion of the encoded signal (102) to obtain a first decoded signal (114a). The second decoder (110b) decodes the second portion (104b) in accordance with the second decoding algorithm for a second time portion of the encoded signal (102) to obtain a second decoded signal (114b). The BWE module (130) has a controllable crossover frequency (fx) and is configured for performing a bandwidth extension algorithm using the first decoded signal (114a) and the BWE parameters (106) for the first portion (104b), and for performing a bandwidth extension algorithm using the second decoded signal (114b) and the bandwidth extension parameter (106) for the second portion (104b). The controller (140) controls the crossover frequency (fx) for the BWE module (130) in accordance with the coding mode information (108).

    Low bitrate audio encoding/decoding scheme having cascaded switches
    4.
    发明公开
    Low bitrate audio encoding/decoding scheme having cascaded switches 审中-公开
    Audiokodierungs- / Audiodekodierungsschema geringer Bitrate mit kaskadierten Schaltvorrichtungen

    公开(公告)号：EP2144230A1

    公开(公告)日：2010-01-13

    申请号：EP09002271.6

    申请日：2009-02-18

    申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. ,  Voiceage Corporation

    发明人： Grill, Bernhard ,  Lefebvre, Roch ,  Bessette, Bruno ,  Lapierre, Jimmy ,  Gournay, Philippe ,  Salami, Redwan ,  Bayer, Stefan ,  Fuchs, Guillaume ,  Geyersberger, Stefan ,  Geiger, Ralf ,  Hilpert, Johannes ,  Krämer, Ulrich ,  Lecomte, Jeremie ,  Multrus, Markus ,  Neuendorf, Max ,  Popp, Harald ,  Rettelbach, Nikolaus

    IPC分类号： G10L19/14

    CPC分类号： G10L19/008 ,  G10L19/0017 ,  G10L19/0212 ,  G10L19/173 ,  G10L19/18 ,  G10L2019/0008

    摘要： An audio encoder comprises a first information sink oriented encoding branch such as a spectral domain encoding branch, a second information source or SNR oriented encoding branch such as an LPC-domain encoding branch, and a switch for switching between the first encoding branch and the second encoding branch, wherein the second encoding branch comprises a converter into a specific domain different from the spectral domain such as an LPC analysis stage generating an excitation signal, and wherein the second encoding branch furthermore comprises a specific domain coding branch such as LPC domain processing branch, and a specific spectral domain coding branch such as LPC spectral domain processing branch, and an additional switch for switching between the specific domain coding branch and the specific spectral domain coding branch. An audio decoder comprises a first domain decoder such as a spectral domain decoding branch, a second domain decoder such as an LPC domain decoding branch for decoding a signal such as an excitation signal in the second domain, and a third domain decoder such as an LPC-spectral decoder branch and two cascaded switches for switching between the decoders.

    摘要翻译： 音频编码器包括：第一信息宿定向编码分支，例如频域编码分支，第二信息源或SNR定向编码分支，诸如LPC域编码分支，以及用于在第一编码分支与第二编码分支之间进行切换的开关 编码分支，其中所述第二编码分支包括转换器到不同于所述频域的特定域，例如产生激励信号的LPC分析阶段，并且其中所述第二编码分支还包括特定域编码分支，诸如LPC域处理分支 ，以及诸如LPC频域处理分支的特定频域编码分支，以及用于在特定编码分支和特定频域编码分支之间切换的附加开关。 音频解码器包括诸如频域解码分支的第一域解码器，用于对诸如第二域中的激励信号的信号进行解码的LPC域解码分支的第二域解码器，以及诸如LPC 光谱解码器分支和两个级联开关，用于在解码器之间切换。

    Audio encoder, audio decoder and audio processor having a dynamically variable warping characteristic
    5.
    发明公开
    Audio encoder, audio decoder and audio processor having a dynamically variable warping characteristic 审中-公开
    音频编码器，音频解码器和具有动态可变翘曲特性的音频处理器

    公开(公告)号：EP1990799A1

    公开(公告)日：2008-11-12

    申请号：EP08014723.4

    申请日：2006-06-30

    申请人： Fraunhofer-Gesellschaft zur Förderung der Angewandten Forschung e.V.

    发明人： Wabnik, Stefan ,  Schuller, Gerald ,  Herre, Jürgen ,  Grill, Bernhard ,  Multrus, Markus ,  Bayer, Stefan ,  Krämer, Ulrich ,  Hirschfeld, Jens

    IPC分类号： G10L19/00

    CPC分类号： G10L19/20 ,  G10L19/265

    摘要： An audio encoder, an audio decoder or an audio processor includes a filter for generating a filtered audio signal, the filter having a variable warping characteristic, the characteristic being controllable in response to a time-varying control signal, the control signal indicating a small or no warping characteristic or a comparatively high warping characteristic. Furthermore, a controller is connected for providing the time-varying control signal, which depends on the audio signal. The filtered audio signal can be introduced to an encoding processor having different encoding algorithms, one of which is a coding algorithm adapted to a specific signal pattern. Alternatively, the filter is a post-filter receiving a decoded audio signal.

    摘要翻译： 音频编码器，音频解码器或音频处理器包括用于生成滤波音频信号的滤波器，该滤波器具有可变翘曲特性，该特性响应于时变控制信号是可控制的，该控制信号指示小的或 无翘曲特性或相对较高的翘曲特性。 此外，控制器被连接用于提供取决于音频信号的时变控制信号。 滤波后的音频信号可以被引入到具有不同编码算法的编码处理器，其中之一是适用于特定信号模式的编码算法。 或者，滤波器是接收解码音频信号的后置滤波器。

    An apparatus and a method for encoding an audio signal
    7.
    发明公开
    An apparatus and a method for encoding an audio signal 有权
    Vorrichtung und Verfahren zur Kodierung eines Tonsignals

    公开(公告)号：EP2352147A2

    公开(公告)日：2011-08-03

    申请号：EP11162255.1

    申请日：2009-06-23

    申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

    发明人： Neuendorf, Max ,  Krämer, Ulrich ,  Grill, Bernhard ,  Multrus, Markus ,  Popp, Harald ,  Rettelbach, Nikolaus ,  Nagel, Frederik ,  Lohwasser, Markus ,  Gayer, Marc ,  Jander, Manuel ,  Bacigalupo, Virgilio

    IPC分类号： G10L19/14 ,  G10L21/02 ,  G10L19/00

    CPC分类号： G10L21/038 ,  G10L19/008 ,  G10L19/0212 ,  G10L19/022 ,  G10L19/20 ,  G10L21/04

    摘要： An apparatus for decoding (100) an encoded audio signal (102), the encoded audio signal (102) comprising a first portion (104a) encoded in accordance with a first encoding algorithm, a second portion (104b) encoded in accordance with a second encoding algorithm, BWE parameters (106) for the first portion (104a) and the second portion (104b) and a coding mode information (108) indicating a first decoding algorithm or a second decoding algorithm, comprises a first decoder (110a), a second decoder (110b), a BWE module (130) and a controller (140). The first decoder (110a) decodes the first portion (104a) in accordance with the first decoding algorithm for a first time portion of the encoded signal (102) to obtain a first decoded signal (114a). The second decoder (110b) decodes the second portion (104b) in accordance with the second decoding algorithm for a second time portion of the encoded signal (102) to obtain a second decoded signal (114b). The BWE module (130) has a controllable crossover frequency (fx) and is configured for performing a bandwidth extension algorithm using the first decoded signal (114a) and the BWE parameters (106) for the first portion (104b), and for performing a bandwidth extension algorithm using the second decoded signal (114b) and the bandwidth extension parameter (106) for the second portion (104b). The controller (140) controls the crossover frequency (fx) for the BWE module (130) in accordance with the coding mode information (108).

    摘要翻译： 一种用于解码（100）编码音频信号（102）的装置，所述编码音频信号（102）包括根据第一编码算法编码的第一部分（104a），根据第二编码算法编码的第二部分（104b） 编码算法，用于第一部分（104a）和第二部分（104b）的BWE参数（106）和指示第一解码算法或第二解码算法的编码模式信息（108）包括第一解码器（110a）， 第二解码器（110b），BWE模块（130）和控制器（140）。 第一解码器（110a）根据编码信号（102）的第一时间部分的第一解码算法对第一部分（104a）进行解码，以获得第一解码信号（114a）。 第二解码器（110b）根据第二解码算法对编码信号（102）的第二时间部分解码第二部分（104b），以获得第二解码信号（114b）。 BWE模块（130）具有可控的交叉频率（fx），并且被配置为使用第一部分（104b）的第一解码信号（114a）和BWE参数（106）来执行带宽扩展算法，并且用于执行 使用第二解码信号（114b）的带宽扩展算法和用于第二部分（104b）的带宽扩展参数（106）。 控制器（140）根据编码模式信息（108）控制BWE模块（130）的交叉频率（fx）。