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    • 4. 发明申请
    • MIXING OF INPUT DATA STREAMS AND GENERATION OF AN OUTPUT DATA STREAM THEREFROM
    • 输入数据流的混合和其输出数据流的生成
    • WO2009109374A2
    • 2009-09-11
    • PCT/EP2009/001534
    • 2009-03-04
    • FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.SCHNELL, MarkusLUTZKY, ManfredMULTRUS, Markus
    • SCHNELL, MarkusLUTZKY, ManfredMULTRUS, Markus
    • G10L19/00
    • G10L21/038G10L19/008G10L19/265
    • An apparatus (500) for mixing a plurality of input data streams (510) is described, wherein the input data streams (510) each comprise a frame (540) of audio data in the spectral domain, a frame (540) of an input data stream (510) comprising spectral information for a plurality of spectral components. The apparatus comprises a processing unit (520) adapted to compare the frames (540) of the plurality of input data streams (510). The processing unit (520) is further adapted to determine, based on the comparison, for a spectral component of an output frame (550) of an output data stream (530), exactly one input data stream (510) of the plurality of input data streams (510). The processing unit (520) is further adapted to generate the output data stream (530) by copying at least a part of an information of a corresponding spectral component of the frame of the determined data stream (510) to describe the spectral component of the output frame (550) of the output data stream (530). Further or alternatively, the control value of the frames (540) of the first input data stream (510-1) and the second input data stream (510-2) may be compared to yield a comparison result and, if the comparison result is positive, the output data stream (530) comprising an output frame (550) may be generated such that the output frame (550) comprises a control value equal to that of the first and second input data streams (510) and payload data derived from the payload data of the frames of the first and second input data streams by processing the audio data in the spectral domain.
    • 描述了用于混合多个输入数据流(510)的装置(500),其中输入数据流(510)各自包括频谱域中的音频数据的帧(540),输入的帧(540) 数据流(510)包括用于多个频谱分量的频谱信息。 该装置包括适于比较多个输入数据流(510)的帧(540)的处理单元(520)。 处理单元(520)还适于基于比较确定对于输出数据流(530)的输出帧(550)的频谱分量,多个输入的恰好一个输入数据流(510) 数据流(510)。 处理单元(520)还适于通过复制所确定的数据流(510)的帧的对应频谱分量的信息的至少一部分来生成输出数据流(530),以描述所确定的数据流的频谱分量 输出数据流(530)的输出帧(550)。 进一步或替代地,可以比较第一输入数据流(510-1)和第二输入数据流(510-2)的帧(540)的控制值以产生比较结果,并且如果比较结果为 可以生成包括输出帧(550)的输出数据流(530),使得输出帧(550)包括等于第一和第二输入数据流(510)的控制值和从 通过处理频谱域中的音频数据来输出第一和第二输入数据流的帧的有效载荷数据。
    • 6. 发明申请
    • APPARATUS FOR MIXING A PLURALITY OF INPUT DATA STREAMS
    • 混合输入数据流的大量设备
    • WO2009109373A2
    • 2009-09-11
    • PCT/EP2009/001533
    • 2009-03-04
    • FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.SCHNELL, MarkusLUTZKY, ManfredMULTRUS, Markus
    • SCHNELL, MarkusLUTZKY, ManfredMULTRUS, Markus
    • G10L19/00
    • G10L21/038G10L19/008G10L19/265
    • An apparatus (500) according to an embodiment of the present invention for mixing a first frame (540-1) of a first input data stream (510-1) and a second frame (540-2) of a second input data stream (510-2) comprises a processing unit (520) adapted to generate an output frame (550), wherein the output frame (550) comprises output spectral data describing a lower part of an output spectrum up to an output cross-over frequency, and wherein the output frame further comprises output SBR-data describing a higher part of the output spectrum above the output cross-over frequency by way of energy-related values in an output time/frequency grid resolution. The processing unit (520) is further adapted such that the output spectral data corresponding to frequencies below a minimum value of cross-over frequencies of the first frame, the second frame and the output cross-over frequency is generated in a spectral domain and the output SBR-data corresponding to frequencies above a maximum value of cross-over frequencies of the first and second frames and the output cross-over frequency is processed in a SBR-domain.
    • 根据本发明实施例的装置(500),用于将第一输入数据流(510-1)的第一帧(540-1)和第二输入数据流的第二帧(540-2) 510-2)包括适于产生输出帧(550)的处理单元(520),其中所述输出帧(550)包括描述直到输出交叉频率的输出频谱的较低部分的输出频谱数据,以及 其中输出帧还包括通过输出时间/频率网格分辨率中的能量相关值来描述在输出交叉频率之上的输出频谱的较高部分的输出SBR数据。 处理单元(520)还适于使得对应于低于第一帧,第二帧和输出交叉频率的交叉频率的最小值的频率的输出频谱数据在频域中生成,并且 对应于高于第一和第二帧的交叉频率的最大值的频率的输出SBR数据和输出交叉频率在SBR域中被处理。
    • 8. 发明申请
    • AUDIO SIGNAL ENCODER, AUDIO SIGNAL DECODER, METHOD FOR PROVIDING AN ENCODED REPRESENTATION OF AN AUDIO CONTENT, METHOD FOR PROVIDING A DECODED REPRESENTATION OF AN AUDIO CONTENT AND COMPUTER PROGRAM FOR USE IN LOW DELAY APPLICATIONS
    • 音频信号编码器,音频信号解码器,用于提供音频内容的编码表示的方法,用于提供音频内容的解码表示的方法和用于低延迟应用的计算机程序
    • WO2011048118A1
    • 2011-04-28
    • PCT/EP2010/065753
    • 2010-10-19
    • FRAUNHOFER GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.GEIGER, RalfSCHNELL, MarkusLECOMTE, JérémieSCHMIDT, KonstantinFUCHS, GuillaumeRETTELBACH, Nikolaus
    • GEIGER, RalfSCHNELL, MarkusLECOMTE, JérémieSCHMIDT, KonstantinFUCHS, GuillaumeRETTELBACH, Nikolaus
    • G10L19/02G10L19/04G10L19/14
    • G10L19/0212G10L19/022G10L19/20
    • An audio signal encoder (100) comprises a transform-domain path (12) configured to obtain a set of spectral coefficients (124) and noise-shaping information (126) on the basis of a time-domain representation (122) of a portion of the audio content to be encoded in a transform-domain mode. The transform-domain path comprises a time-domain-to-frequency-domain converter (130) configured to window a time-domain representation of the audio content, or a pre-processed version thereof, to obtain a windowed representation of the audio content, and to apply a time-domain-to-frequency-domain conversion, to derive a set of spectral coefficients from the windowed time-domain representation of the audio content. The audio signal decoder comprises a CELP path (140) configured to obtain an code-excitation information (144) and a linear-prediction-domain parameter information (146) on the basis of a portion of the audio content to be encoded in a CELP mode. The time-domain-to-frequency-domain converter (136) is configured to apply a predetermined asymmetric analysis window (520) for a windowing of a current portion of the audio content to be encoded in the transform-domain mode and following a portion of the audio content encoded in the transform-domain mode both if the current portion of the audio content is followed by a subsequent portion of the audio content to be encoded in the transform-domain mode and if the current portion of the audio content is followed by a subsequent portion of the audio content to be encoded in the CELP mode. The audio signal encoder is configured to selectively provide an aliasing cancellation information (164) if the current portion of the audio content is followed by a subsequent portion of the audio content to be encoded in the CELP mode.
    • 音频信号编码器(100)包括变换域路径(12),其经配置以基于部分的时域表示(122)获得一组频谱系数(124)和噪声整形信息(126) 要以变换域模式编码的音频内容。 变换域路径包括被配置为对音频内容的时域表示或其预处理版本进行窗口化的时域 - 频域转换器(130),以获得音频内容的窗口化表示 并且应用时域到频域转换,从音频内容的加窗时域表示中导出一组频谱系数。 音频信号解码器包括CELP路径(140),其被配置为基于要在CELP中编码的音频内容的一部分来获得码激励信息(144)和线性预测域参数信息(146) 模式。 时域 - 频域转换器(136)被配置为对预定的非对称分析窗口(520)应用于在变换域模式中对要编码的音频内容的当前部分的加窗,并且遵循一部分 如果音频内容的当前部分后面是要以变换域模式编码的音频内容的后续部分,并且如果跟随音频内容的当前部分,则以变换域模式编码的音频内容 通过CELP模式中要编码的音频内容的后续部分。 音频信号编码器被配置为如果音频内容的当前部分跟随着要以CELP模式编码的音频内容的后续部分,则选择性地提供混叠消除信息(164)。
    • 9. 发明申请
    • INFORMATION SIGNAL REPRESENTATION USING LAPPED TRANSFORM
    • 使用快速变换的信息信号表示
    • WO2012110478A1
    • 2012-08-23
    • PCT/EP2012/052458
    • 2012-02-14
    • FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.SCHNELL, MarkusGEIGER, RalfRAVELLI, EmmanuelFOTOPOULOU, Eleni
    • SCHNELL, MarkusGEIGER, RalfRAVELLI, EmmanuelFOTOPOULOU, Eleni
    • G10L19/02
    • G10L19/00G10K11/16G10L19/005G10L19/012G10L19/0212G10L19/025G10L19/03G10L19/04G10L19/107G10L19/12G10L19/22G10L19/26G10L21/0216G10L25/06G10L25/78
    • An information signal reconstructor is configured to reconstruct, using aliasing cancellation, an information signal from a lapped transform representation of the information signal comprising, for each of consecutive, overlapping regions of the information signal, a transform of a windowed version of the respective region, wherein the information signal reconstructor is configured to reconstruct the information signal at a sample rate which changes at a border (82) between a preceding region (84) and a succeeding region (86) of the information signal. The information signal reconstructor comprises a retransformer (70) configured to apply a retransformation on the transform (94) of the windowed version of the preceding region (84) so as to obtain a retransform (96) for the preceding region (84), and apply a retransformation on the transform of the windowed version of the succeeding region (86) so as to obtain a retransform (100) for the succeeding region (86), wherein the retransform (96) for the preceding region (84) and the retransform (106) for the succeeding region (86) overlap at an aliasing cancellation portion (102) at the border (82) between the preceding and succeeding regions; a resampler (72) configured to resample, by interpolation, the retransform (96) for preceding region (84) and/or the retransform (100) for the succeeding region (86) at the aliasing cancellation portion (102 )according to a sample rate change at the border (82); and a combiner (74) configured to perform aliasing cancellation between the retransforms (96, 100) for the preceding and succeeding regions (84, 86) as obtained by the resampling at the aliasing cancellation portion (102).
    • 信息信号重建器被配置为使用混叠消除来重建来自信息信号的重叠变换表示的信息信号,所述信息信号包括对于信息信号的连续重叠区域中的每一个,对相应区域的窗口版本进行变换, 其中所述信息信号重建器被配置为以在所述信息信号的先前区域(84)和后续区域(86)之间的边界(82)处改变的采样率来重构所述信息信号。 信息信号重构器包括重构器(70),被配置为对先前区域(84)的加窗版本的变换(94)应用重新变换,以获得用于前一区域(84)的再转换(96),以及 对后续区域(86)的加窗版本的变换应用重新形成,以获得后续区域(86)的再次转换(100),其中用于前一区域(84)的再转换(96)和重新形式 用于后续区域(86)的(106)在前后区域之间的边界(82)的混叠消除部分(102)处重叠; 重新采样器(72),被配置为根据样本对在先前区域(84)和/或后面区域(86)处的别名取消部分(102)进行内插重新采样,重新取样(96) 边境率(82); 以及组合器(74),被配置为在通过所述混叠消除部分(102)处的重采样获得的前后区域(84,86)的所述再次转换(96,100)之间执行混叠消除。