公开(公告)号：US06441755B1

公开(公告)日：2002-08-27

申请号：US09786614

申请日：2001-05-07

申请人： Martin Dietz ,  Ali Nowbakht-Irani ,  Ralph Sperschneider ,  Oliver Kunz

发明人： Martin Dietz ,  Ali Nowbakht-Irani ,  Ralph Sperschneider ,  Oliver Kunz

IPC分类号： H03M700

CPC分类号： H03M7/40

摘要： A method and a device for entropy encoding and associated decoding make use of a code consisting on the one hand of a code table with reversible code words (12) and comprising on the other hand an escape region for information words to be coded which are located outside the region (14) defined by said code table. Said region can be selected in such a way that a major part of the information words is coded with symmetrical code words by the code table. On the one hand, it is thus possible to carry out, in addition to forward decoding, also backward decoding (24) and on the other hand, use of reversible code words allows for rapid recognition of errors in a code word stream transmitted over a non-ideal channel.

摘要翻译： 用于熵编码和相关解码的方法和装置利用一方面由具有可逆码字（12）的码表组成的码，另一方面，包括位于所要被编码的信息字的转义区域 在由所述代码表定义的区域（14）之外。 所述区域可以以这样一种方式进行选择，使得主要部分的信息字通过码表用对称码字编码。 一方面，除了正向解码之外，还可以进行反向解码（24），另一方面，可逆的代码字的使用允许快速识别通过 非理想渠道

公开(公告)号：US20080232213A1

公开(公告)日：2008-09-25

申请号：US10597320

申请日：2005-01-24

申请人： Johannes Wilhelmus Maria Bergmans ,  Albert Hendrik Jan Immink ,  Jamal Riani ,  Willem Marie Julia Marcel Coene ,  Steven Jena-Marie Lucie Van Beneden ,  Massimo Ciacci ,  Ali Nowbakht Irani

发明人： Johannes Wilhelmus Maria Bergmans ,  Albert Hendrik Jan Immink ,  Jamal Riani ,  Willem Marie Julia Marcel Coene ,  Steven Jena-Marie Lucie Van Beneden ,  Massimo Ciacci ,  Ali Nowbakht Irani

IPC分类号： G11B5/58

CPC分类号： G11B20/10046 ,  G11B20/10 ,  G11B20/10009 ,  G11B20/18 ,  G11B2020/1275 ,  G11B2020/1288 ,  G11B2020/1863 ,  H03M13/41 ,  H03M13/6331

摘要： On existing DVD and CD players a control loop is required for the adaptation and timing recovery. For Two-Dimensional Optical Storage such a control loop has drawbacks because PRML detection in the form of a stripe-wise Viterbi detector is used. Such a detector introduces an increasing detection delay when going from the outer rows towards the center of the broad spiral. A feedback loop is arranged to determining an error signal from a first area of the data block where the first area is that area where the error signal can be determined within the shortest period of time. This reduces the duration of the detection step and thus increases the stability of the control loop.

摘要翻译： 在现有的DVD和CD播放机上，适配和定时恢复需要一个控制环路。 对于二维光学存储，这样的控制回路具有缺点，因为使用了带状维特比检测器形式的PRML检测。 这种检测器在从外排朝向宽螺旋的中心时引入增加的检测延迟。 反馈环路被布置成从数据块的第一区域确定误差信号，其中第一区域是可以在最短时间内确定误差信号的区域。 这减少了检测步骤的持续时间，从而增加了控制回路的稳定性。

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。