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1. 发明授权

US07003448B1 Method and device for error concealment in an encoded audio-signal and method and device for decoding an encoded audio signal 有权
标题翻译：用于编码音频信号中的错误隐藏的方法和装置，以及用于对编码的音频信号进行解码的方法和装置
公开(公告)号：US07003448B1
公开(公告)日：2006-02-21
申请号：US09980534
申请日：2000-04-12
申请人： Pierre Lauber , Martin Dietz , Juergen Herre , Reinhold Boehm , Ralph Sperschneider , Daniel Homm
发明人： Pierre Lauber , Martin Dietz , Juergen Herre , Reinhold Boehm , Ralph Sperschneider , Daniel Homm
IPC分类号： G10L19/00
CPC分类号： G10L19/005
摘要： In a method for concealing an error in an encoded audio signal a set of spectral coefficients is subdivided into at least two sub-bands (14), whereupon the sub-bands are subjected to a re-verse transform (16). A specific prediction is performed (18) for each quasi time signal of a sub-band to obtain an estimated temporal representation for a sub-band of a set of spectral coefficients following the current set. A forward transform (20) of the time signal of each sub-band provides estimated spectral coefficients which can be used (28) instead of erroneous spectral coefficients of a following set of spectral coefficients, e.g. in order to conceal transmission errors. Transforming at the sub-band level provides independence from transform characteristics such as block length, window type and MDCT algorithm while at the same time preserving spectral processing for error concealment. Thus the spectral characteristics of audio signals can also be taken into account during error concealment.
摘要翻译：在用于隐藏编码音频信号中的错误的方法中，一组频谱系数被细分为至少两个子带（14），于是子带经受逆变换（16）。对于子带的每个准时间信号执行特定的预测（18），以获得在当前集合之后的一组频谱系数的子带的估计时间表示。每个子带的时间信号的正向变换（20）提供可以使用的估计的频谱系数（28），而不是以下的频谱系数集合的错误频谱系数，例如。以掩盖传输错误。在子带级变换提供独立于诸如块长度，窗口类型和MDCT算法的变换特征，同时保留用于错误隐藏的频谱处理。因此，在错误隐藏期间也可以考虑音频信号的频谱特性。

2. 发明授权

US07103554B1 Method and device for generating a data flow from variable-length code words and a method and device for reading a data flow from variable-length code words 有权
标题翻译：用于从可变长度码字生成数据流的方法和装置以及用于从可变长度码字读取数据流的方法和装置
公开(公告)号：US07103554B1
公开(公告)日：2006-09-05
申请号：US09914114
申请日：2000-01-17
申请人： Ralph Sperschneider , Martin Dietz , Pierre Lauber , Michael Schug
发明人： Ralph Sperschneider , Martin Dietz , Pierre Lauber , Michael Schug
IPC分类号： G10L19/00 , H04N11/04 , H04N5/91
CPC分类号： H03M7/42
摘要： In a method for producing a data stream of code words of variable lengths which are divided up into a plurality of sets of code words, wherein a raster having segments is specified for the data stream, wherein two adjacent raster points define a segment, code words of the first sets are written into the data stream starting at raster points. Subsequently, code words of the second set are written into the data stream pursuant to a predetermined assignment rule, wherein each code word of the second set is assigned to a different segment. Entire code words or parts of code words which cannot be written according to their assignment, are stored and entered into the data stream in further attempts, wherein the assignment by a predetermined regulation is changed from attempt to attempt. This procedure is analogously repeated for any further set which may be present. Thus, the ends of code words of the second set are decoupled from the starts of following code words of the second set, since the corresponding code words of a set are written segment by segment, which results in a reduction of error propagation.
摘要翻译：在一种用于产生被划分成多组代码字的可变长度的码字的数据流的方法中，其中为数据流指定了具有段的光栅，其中两个相邻的光栅点定义了段，代码字的第一组被写入从光栅点开始的数据流。随后，根据预定的分配规则将第二组的代码字写入数据流，其中第二组的每个代码字被分配给不同的段。根据其分配不能写入的整个码字或代码字的部分被进一步尝试存储并输入到数据流中，其中通过预定调节的分配从尝试改变为尝试。对于可能存在的任何另外的集合，类似地重复该过程。因此，第二组的码字的末端与第二组的后续代码字的开始分离，因为一组的相应代码字逐段写入，这导致误差传播的减少。

3. 发明授权

US06975254B1 Methods and devices for coding or decoding an audio signal or bit stream 有权
标题翻译：用于对音频信号或位流进行编码或解码的方法和装置
公开(公告)号：US06975254B1
公开(公告)日：2005-12-13
申请号：US09869401
申请日：1998-12-28
申请人： Ralph Sperschneider , Martin Dietz , Andreas Ehret , Karlheinz Brandenburg , Heinz Gerhaeuser , Ali Nowbakht-Irani , Pierre Lauber , Roland Bitto
发明人： Ralph Sperschneider , Martin Dietz , Andreas Ehret , Karlheinz Brandenburg , Heinz Gerhaeuser , Ali Nowbakht-Irani , Pierre Lauber , Roland Bitto
IPC分类号： G10L19/02 , G10L19/032 , H03M7/00 , H03M7/30 , H03M7/40 , H03M13/35 , H04B1/66 , H04H20/00
CPC分类号： G10L19/032 , G10L19/0212 , H03M7/40 , H03M13/35 , H04B1/662
摘要： In a method for coding an audio signal to obtain a coded bit stream, discrete-time samples of the audio signal are transformed into the frequency domain to obtain spectral values. The spectral values are coded with a code table having a limited number of code words of different lengths to obtain spectral values coded by code words, the length of a code word assigned to a spectral value being that much shorter the higher the probability of occurrence of the spectral value is. A raster is then specified for the coded bit stream, the raster having equidistant raster points and the distance between the raster points depending on the code table(s) used. In order to obtain error-tolerant Huffman coding, priority code words, which represent particular spectral values which are psychoacoustically more important than other spectral values, are so arranged in the raster that the start of each priority code word coincides with a raster point.
摘要翻译：在用于编码音频信号以获得编码比特流的方法中，音频信号的离散时间采样被变换到频域以获得频谱值。频谱值用具有不同长度的有限数量的码字的码表编码，以获得由码字编码的频谱值，分配给频谱值的码字的长度远短于发生概率的频率值光谱值为。然后为编码比特流指定光栅，光栅具有等距的光栅点，并且根据所使用的代码表，光栅点之间的距离。为了获得容错霍夫曼编码，代表在心理学上比其他频谱值更重要的特定频谱值的优先码字被布置在光栅中，每个优先码字的开始与光栅点重合。

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