公开(公告)号：EP3025328A1

公开(公告)日：2016-06-01

申请号：EP14739160.1

申请日：2014-07-15

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

发明人： DISCH, Sascha ,  NAGEL, Frederik ,  GEIGER, Ralf ,  THOSHKAHNA, Balaji Nagendran ,  SCHMIDT, Konstantin ,  BAYER, Stefan ,  NEUKAM, Christian ,  EDLER, Bernd ,  HELMRICH, Christian

IPC分类号： G10L19/008 ,  G10L21/038 ,  G10L19/18 ,  G10L19/02

CPC分类号： G10L19/008 ,  G10L19/02 ,  G10L19/0204 ,  G10L19/0208 ,  G10L19/0212 ,  G10L19/022 ,  G10L19/025 ,  G10L19/03 ,  G10L19/032 ,  G10L19/06 ,  G10L21/0388 ,  G10L25/06 ,  H04S1/007

摘要： Apparatus for decoding an encoded audio signal comprising an encoded core signal (1), comprising: a core decoder (1400) for decoding the encoded core signal (1401) to obtain a decoded core signal; a tile generator (1404) for generating one or more spectral tiles having frequencies not included in the decoded core signal using a spectral portion of the decoded core signal; and a cross-over filter (1406) for spectrally cross-over filtering the decoded core signal and a first frequency tile having frequencies extending from a gap filling frequency (309) to an upper border frequency or for spectrally cross-over filtering a first frequency tile and a second frequency tile.

公开(公告)号：EP3017448A1

公开(公告)日：2016-05-11

申请号：EP14739811.9

申请日：2014-07-15

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

发明人： DISCH, Sascha ,  GEIGER, Ralf ,  HELMRICH, Christian ,  NAGEL, Frederik ,  NEUKAM, Christian ,  SCHMIDT, Konstantin ,  FISCHER, Michael

IPC分类号： G10L21/038 ,  G10L19/028

摘要： Apparatus for decoding an encoded audio signal comprising an encoded core signal (1), comprising: a core decoder (1400) for decoding the encoded core signal (1401) to obtain a decoded core signal; a tile generator (1404) for generating one or more spectral tiles having frequencies not included in the decoded core signal using a spectral portion of the decoded core signal; and a cross-over filter (1406) for spectrally cross-over filtering the decoded core signal and a first frequency tile having frequencies extending from a gap filling frequency (309) to an upper border frequency or for spectrally cross-over filtering a first frequency tile and a second frequency tile.

摘要翻译： 一种用于包括编码信号的核心的编码音频信号的解码（1），包括：用于对编码核心信号（1401），以获得经解码的核心信号进行解码的核心解码器（1400）; 图块生成器（1404），用于产生具有不包括在核心使用解码核心信号的频谱部分的解码信号的频率的一个或多个光谱的瓷砖; 和交叉过滤器（1406）用于光谱交叉滤波解码核心信号和具有频率从间隙延伸的上边界频率或用于光谱交叉滤波的第一频率填充频率（309）到第一频率瓦片 瓦片和第二频率块。

公开(公告)号：EP2959481A1

公开(公告)日：2015-12-30

申请号：EP14706528.8

申请日：2014-02-20

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

发明人： HELMRICH, Christian ,  LECOMTE, Jérémie ,  MARKOVIC, Goran ,  SCHNELL, Markus ,  EDLER, Bernd ,  REUSCHL, Stefan

IPC分类号： G10L19/025

CPC分类号： G10L19/025 ,  G10L19/0212 ,  G10L19/022 ,  H04N19/172 ,  H04N19/176 ,  H04N19/44

摘要： An apparatus for generating an encoded signal, comprises: a window sequence controller (808) for generating a window sequence information (809) for windowing an audio or image signal, the window sequence information indicating a first window (1500) for generating a first frame of spectral values, a second window function (1502) and at least one third window function (1503) for generating a second frame of spectral values, wherein the first window function (1500), the second window function (1502) and the one or more third window functions overlap within a multi-overlap region (1300); a preprocessor (802) for windowing (902) a second block of samples corresponding to the second window function and the at least one third window functions using an auxiliary window function (1 100) to obtain a second block of windowed samples, and for preprocessing (904) the second block of windowed samples using a folding-in operation of a portion of the second block overlapping with a first block into the multi-overlap portion (1300) to obtain a preprocessed second block of windowed samples having a modified multi-overlap portion; a spectrum converter (804) for applying an aliasing-introducing transform (906) to the first block of samples using the first window function to obtain the first frame of spectral values, for applying the aliasing introducing transform to a first portion of the preprocessed second block of windowed samples using the second window function to obtain a first portion of spectral samples of a second frame and for applying the aliasing introducing transform to a second portion of the preprocessed second block of windowed samples using the one or more third window functions (1503) to obtain a second portion of spectral samples of the second frame; and a processor (806) for processing the first frame and the second frame to obtain encoded frames of the audio or image signal.

摘要翻译： 为编码信号的生成的装置，包括：用于产生一个窗口序列信息用于音频或图像信号的窗口的窗口序列控制器，所述窗序列信息，其指示第一窗口，用于产生频谱值的第一帧，第二窗函数，并在 用于产生频谱值的第二帧，所述worin第一窗函数，所述第二窗口函数和一个或多个第三窗函数的多重叠区域内重叠至少一个第三窗函数; 加窗相应于第二窗口函数的样本的第二块，并使用辅助窗函数的获得加窗采样的第二块中，频谱转换器，用于施加到混叠引入变换至少一个第三窗口函数的预处理器; 以及用于处理所述第一帧和所述第二帧中的处理器来获取编码的音频或图象信号的帧。

公开(公告)号：EP2951826A1

公开(公告)日：2015-12-09

申请号：EP14702224.8

申请日：2014-01-28

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

发明人： DISCH, Sascha ,  GEIGER, Ralf ,  HELMRICH, Christian ,  MULTRUS, Markus ,  SCHMIDT, Konstantin

IPC分类号： G10L21/038

CPC分类号： G10L19/12 ,  G10L19/0204 ,  G10L19/032 ,  G10L19/06 ,  G10L21/038 ,  G10L21/0388 ,  G10L25/18 ,  G10L2019/0012 ,  G10L2019/0016

摘要： An apparatus for generating a frequency enhancement signal (130), comprises: a signal generator (200) for generating an enhancement signal from a core signal (120), the enhancement signal comprising an enhancement frequency range not included in the core signal, wherein a time portion of the enhancement signal comprises subband signals for a plurality of subbands; a synthesis filterbank (300) for generating the frequency enhanced signal (140) using the enhancement signal (130), wherein the signal generator (200) is configured for performing an energy limitation in order to make sure that the frequency enhanced signal (140) obtained by the synthesis filterbank (300) is so that an energy of a higher band is, at the most, equal to an energy in a lower band or is greater than an energy of a higher band, at the most, by a predefined threshold.

摘要翻译： 用于产生频率增强信号的装置，包括：用于在增强信号从核心信号产生一个信号发生器，所述增强信号上不包含在核心信号增强的频率范围，包括worin增强信号的一时间部分包括子带信号 用于子带的多元性; 用于使用所述增强信号产生的频率增强信号，worin信号发生器的合成滤波器组被配置为以使surethat由合成滤波器组获得的所以没有在能量较高频段是频增强信号执行能量限制的 ，至多等于在能量在较低的皮带或比在较高的频带的能量大，至多，由预定义的阈值。

公开(公告)号：EP2939235A1

公开(公告)日：2015-11-04

申请号：EP14701558.0

申请日：2014-01-28

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

发明人： DIETZ, Martin ,  FUCHS, Guillaume ,  HELMRICH, Christian ,  MARKOVIC, Goran

IPC分类号： G10L19/035 ,  G10L19/02 ,  G10L25/03

CPC分类号： G10L19/035 ,  G10H1/06 ,  G10H2210/561 ,  G10L19/0212 ,  G10L25/03 ,  G10L25/18 ,  G10L25/21 ,  G10L25/45

摘要： The invention provides an audio encoder for encoding an audio signal (AS) so as to produce therefrom an encoded signal (ES), the audio encoder (1) comprising: a framing device (2) configured to extract frames (F) from the audio signal (AS); a quantizer (3) configured to map spectral lines (SL
1-32 ) of a spectrum signal (SPS) derived from the frame (F) of the audio signal (AS) to quantization indices (I
0 , I
1 ), wherein the quantizer (3) has a dead-zone (DZ), in which the input spectral lines (SL) are mapped to quantization index zero (I
0 ); and a control device (4) configured to modify the dead-zone (DZ); wherein the control device (4) comprises a tonality calculating device (5) configured to calculate at least one tonality indicating value (TI
5.32 ) for at least one spectrum line (SL
1-32 ) or for at least one group of spectral lines (SL
1-32 ), wherein the control device (4) is configured to modify the dead-zone (DZ) for the at least one spectrum line (SL
1-32 ) or the at least one group of spectrum lines (SL
1-32 ) depending on the respective tonality indicating value (TI
5-32 ).

公开(公告)号：EP2904612A1

公开(公告)日：2015-08-12

申请号：EP13742646.6

申请日：2013-07-31

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

发明人： BÄCKSTRÖM, Tom ,  MULTRUS, Markus ,  FUCHS, Guillaume ,  HELMRICH, Christian ,  DIETZ, Martin

IPC分类号： G10L19/107

CPC分类号： G10L19/038 ,  G10L19/107 ,  G10L2019/0001

摘要： An apparatus for encoding a speech signal by determining a codebook vector of a speech coding algorithm is provided. The apparatus includes a matrix determiner for determining an autocorrelation matrix R, and a codebook vector determiner for determining the codebook vector depending on the autocorrelation matrix R. The matrix determiner is configured to determine the autocorrelation matrix R by determining vector coefficients of a vector r, wherein the autocorrelation matrix R includes a plurality of rows and a plurality of columns, wherein the vector r indicates one of the columns or one of the rows of the autocorrelation matrix R, wherein R(i, j)=r(|i−j|), wherein R(i, j) indicates the coefficients of the autocorrelation matrix R, wherein i is a first index indicating one of a plurality of rows of the autocorrelation matrix R, and wherein j is a second index indicating one of the plurality of columns of the autocorrelation matrix R.

公开(公告)号：EP2545549B1

公开(公告)日：2014-10-01

申请号：EP11707660.4

申请日：2011-03-08

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

发明人： HELMRICH, Christian ,  GEIGER, Ralf

IPC分类号： G10L19/022 ,  G10L25/45

CPC分类号： H03M7/30 ,  G06F17/10 ,  G10L19/0212 ,  G10L19/022 ,  G10L25/45

摘要： A signal processor for providing a processed version of an input signal in dependence on the input signal comprises a windower configured to window a portion of the input signal, or of a pre-processed version thereof, in dependence on a signal processing window described by signal processing window values for a plurality of window value index values, in order to obtain the processed version of the input signal. The signal processor also comprises a window provider for providing the signal processing window values for a plurality of window value index values in dependence on one or more window shape parameters.

公开(公告)号：EP2375409A1

公开(公告)日：2011-10-12

申请号：EP10169432.1

申请日：2010-07-13

申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. ,  Dolby International AB

发明人： PURNHAGEN, Heiko ,  CARLSSON, Pontus ,  VILLEMOES, Lars ,  ROBILLARD, Julien ,  NEUSINGER, Matthias ,  HELMRICH, Christian ,  HILPERT, Johannes ,  RETTELBACH, Nikolaus ,  DISCH, Sascha ,  EDLER, Bernd

IPC分类号： G10L19/00 ,  G10L19/04

CPC分类号： G10L19/04 ,  G10L19/008

摘要： An audio encoder and an audio decoder are based on a combination of two audio channels (201, 202) to obtain a first combination signal (204) as a mid signal and a residual signal (205) which can be derived using a predicted side signal derived from the mid signal. The first combination signal and the prediction residual signal are encoded (209) and written (212) into a data stream (213) together with the prediction information (206) derived by an optimizer (207) based on an optimization target (208). A decoder uses the prediction residual signal, the first combination signal and the prediction information to derive a decoded first channel signal and a decoded second channel signal. In an encoder example or in a decoder example, a real-to-imaginary transform can be applied for estimating the imaginary part of the spectrum of the first combination signal. For calculating the prediction signal used in the derivation of the prediction residual signal, the real-valued first combination signal is multiplied by a real portion of the complex prediction information and the estimated imaginary part of the first combination signal is multiplied by an imaginary portion of the complex prediction information.

摘要翻译： 到音频解码器的音频编码器，并且基于两个音频信道的组合（201,202），以获得第一组合信号（204）作为一个中间信号和其可以使用预测的侧信号导出的残差信号（205） 从中间信号导出。 第一组合信号和所述预测残差信号进行编码（209）和写入（212）成数据流（213），在优化目标（208）的基础上通过在优化器（207）导出的所述预测信息（206）连接在一起。 解码器使用所述预测残差信号，第一组合信号和预测信息来导出经解码的第一声道信号和解码的第二信道信号。 在编码器实施例中或在解码器实施例中，实部 - 虚数变换可以应用用于估计所述第一组合信号的频谱的虚部。 用于计算预测残留信号的导出中使用的预测信号，该实值的第一组合信号，乘以的复预测信息和所述第一组合信号的估算虚部实数部分在虚部被-乘以 复杂的预测信息。

公开(公告)号：EP4453932A1

公开(公告)日：2024-10-30

申请号：EP22838901.1

申请日：2022-12-23

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

发明人： HELMRICH, Christian ,  FOTOPOULOU, Eleni ,  FÜG, Richard ,  MARKOVIC, Goran ,  MULTRUS, Markus ,  REUTELHUBER, Franz

IPC分类号： G10L19/02 ,  G10L19/18 ,  G10L19/22 ,  G10L21/038

公开(公告)号：EP4369337A2

公开(公告)日：2024-05-15

申请号：EP24165597.6

申请日：2014-07-15

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

发明人： Dick, Sascha ,  HELMRICH, Christian ,  Hölzer, Andreas

IPC分类号： G10L19/03

CPC分类号： G10L19/03 ,  G10L19/022 ,  G10L19/008 ,  G10L19/028

摘要： A frequency-domain audio codec is provided with the ability to additionally support a certain transform length in a backward-compatible manner, by the following: the frequency-domain coefficients of a respective frame are transmitted in an interleaved manner irrespective of the signalization signaling for the frames as to which transform length actually applies, and additionally the frequency-domain coefficient extraction and the scale factor extraction operate independent from the signalization. By this measure, old-fashioned frequency-domain audio coders/decoders, insensitive for the signalization, would be able to nevertheless operate without faults and with reproducing a reasonable quality. Concurrently, frequency-domain audio coders/decoders able to support the additional transform length would offer even better quality despite the backward compatibility. As far as coding efficiency penalties due to the coding of the frequency domain coefficients in a manner transparent for older decoders are concerned, same are of comparatively minor nature due to the interleaving.