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1. 发明公开

EP2131590A1 Method and apparatus for generating or cutting or changing a frame based bit stream format file including at least one header section, and a corresponding data structure 审中-公开
标题翻译：用于生产或用于切割或改变具有至少一个头部和相应的数据结构基于帧的比特流格式文件的方法和装置
公开(公告)号：EP2131590A1
公开(公告)日：2009-12-09
申请号：EP08157417.0
申请日：2008-06-02
申请人： Deutsche Thomson OHG
发明人： Kordon, Sven , Jax, Peter , Boehm, Johannes
IPC分类号： H04N7/24 , G11B20/10 , H04L29/06
CPC分类号： G11B20/10527 , G11B20/00181 , G11B20/1262 , G11B2020/00021 , G11B2020/00057
摘要： In frame-based bit stream formats the data required for decoding a current frame are usually stored within the data section for that frame. One exception is the mp3 bit stream where data for a current frame is stored in previous frames. If the decoder did not receive the required previous frame, decoding of the current mp3 frame is skipped. The invention can be applied for such bit streams, in an archival mode, a streaming mode and a sample-exact cutting of an archival mode. In the streaming and cutting modes, new headers are established. The number of frames required for initialising the decoder status is signalised in the header, as well as a consistency check value in the streaming mode. These frames are used for decoder initialisation but not for decoding samples or coefficients. For a sample-exact cutting, for the frame at which the cut shall occur, the number of samples or coefficients to be muted is also indicated in the header. The invention can be applied for the hd3 audio file format for lossless extension of an mp3 bit stream.
摘要翻译：在基于帧的比特流格式的当前帧进行解码所需的数据被该帧的数据部分内存储的一般。一个例外是，其中用于当前帧的数据存储在先前帧中的mp3比特流。如果解码器没有接收到所需的先前帧，当前的mp3帧的解码被跳过。本发明可以以存档的方式，流传输模式和存档方式的采样精确截而施用的用于搜索位流。在流媒体和切割模式，新的头被建立。用于初始化解码器状态所需的帧的数目在报头中，以及在所述流传输模式进行一致性检查的值灯号。这些帧用于解码器初始化，但不用于解码采样或系数。因此，对于一个采样精确截除，对于帧中的哪个切不应出现，样品或要被静音系数的数目在报头中指示。本发明可以应用于用于mp3比特流的无损扩展的HD3音频文件格式。

2. 发明公开

EP2099027A1 Method and apparatus for transforming between different filter bank domains 审中-公开
标题翻译： Verfahren und Vorrichtung zur Umwandlung zwischen verschiedenenFilterbankdomänen
公开(公告)号：EP2099027A1
公开(公告)日：2009-09-09
申请号：EP08102308.7
申请日：2008-03-05
申请人： Deutsche Thomson OHG
发明人： Jax, Peter , Kordon, Sven
IPC分类号： G10L19/14 , H04N7/26
CPC分类号： G10L19/173 , G10L19/0204 , G10L19/0212
摘要： Filter banks may have different structures and different individual output signal domains. Often a translation between different filter bank domains is desirable. Usually, mapping matrices are used that however vary over frequency. This requires a significant amount of lookup tables. A method for transforming first data frames of a first filter bank domain (D S ) to second data frames of a different second filter bank domain (D T ), comprises steps of transcoding sub-bands (mp3(m-1),mp3(m),mp3(m+1)) of the first filter bank domain (D S ) into sub-bands (psdo(m-1), psdo(m),psdo(m+1)) of an intermediate domain (D i ) that corresponds to said second filter bank domain but has warped phase, and transcoding the sub-bands (psdo(m-1), psdo(m), psdo(m+1)) of the intermediate domain (D i ) to sub-bands (MDCT(m-1),MDCT(m),MDCT(m+1)) of the second filter bank domain (D T ), wherein a phase correction (SSC,PCp,PC, PCn) is performed on the sub-bands of the intermediate domain (D i ).
摘要翻译：滤波器组可以具有不同的结构和不同的各个输出信号域。通常，不同滤波器组域之间的转换是期望的。通常，使用映射矩阵，然而随频率而变化。这需要大量的查找表。一种用于将第一滤波器组域（DS）的第一数据帧转换为不同的第二滤波器组域（DT）的第二数据帧的方法包括以下步骤：对子带（mp3（m-1），mp3（m），第一滤波器组域（DS）的mp3（m + 1））变为中间域（D i）的子带（psdo（m-1），psdo（m），psdo（m + 1）对应于所述第二滤波器组域，但是具有翘曲相位，并将中间域（D i）的子带（psdo（m-1），psdo（m），psdo（m + 1））转码为子带（DT）的MDCT（m-1），MDCT（m），MDCT（m + 1）），其中对子带执行相位校正（SSC，PCp，PC，PCn）的中间结构域（D i）。

3. 发明公开

EP2146343A1 Method and apparatus for synchronizing highly compressed enhancement layer data 审中-公开
标题翻译：对于高度压缩的增强层数据的同步的方法和装置
公开(公告)号：EP2146343A1
公开(公告)日：2010-01-20
申请号：EP08160549.5
申请日：2008-07-16
申请人： Deutsche Thomson OHG
发明人： Jax, Peter , Kordon, Sven
IPC分类号： G10L19/14 , H04N7/52
CPC分类号： H04N19/00951 , H04N19/30 , H04N19/91
摘要： Multimedia application data formats often use data packets and may contain packetized hierarchical layers with a base layer (BL) and one or more enhancement layers (EL). Packets that comprise variable length coded data typically provide padding bits, which can be used for adding checksum information. The checksum information refers to both, the decoded base layer and decoded enhancement layer packet data, and is used for detecting synchronization loss between the layers. Though the packets provide different individual amounts of padding bits, this variable amount of bits per packet is sufficient for adding checksum information for synchronization related purposes. This allows e.g. out-of-sync detection even if the enhancement layer encoding provides no overhead information for synchronization, in particular no packet headers and no packet synchronization words.

4. 发明公开

EP2015293A1 Method and apparatus for encoding and decoding an audio signal using adaptively switched temporal resolution in the spectral domain 审中-公开
标题翻译：用于编码和解码音频信号的方法和装置在自适应地切换在谱域的时间分辨率
公开(公告)号：EP2015293A1
公开(公告)日：2009-01-14
申请号：EP07110289.1
申请日：2007-06-14
申请人： Deutsche Thomson OHG
发明人： Boehm, Johannes , Kordon, Sven
IPC分类号： G10L19/02 , G10L19/14
CPC分类号： G10L19/0212 , G10L19/022
摘要： Perceptual audio codecs make use of filter banks and MDCT in order to achieve a compact representation of the audio signal, by removing redundancy and irrelevancy from the original audio signal. During quasi-stationary parts of the audio signal a high frequency resolution of the filter bank is advantageous in order to achieve a high coding gain, but this high frequency resolution is coupled to a coarse temporal resolution that becomes a problem during transient signal parts by producing audible pre-echo effects. The invention achieves improved coding/decoding quality by applying on top of the output of a first filter bank a second non-uniform filter bank, i.e. a cascaded MDCT. The inventive codec uses switching to an additional extension filter bank (or multi-resolution filter bank) in order to re-group the time-frequency representation during transient or fast changing audio signal sections. By applying a corresponding switching control, pre-echo effects are avoided and a high coding gain and a low coding delay are achieved.
摘要翻译：感知音频编解码器制作为了实现音频信号的紧凑表示，通过从原始音频信号消除冗余和不相干使用滤波器组和MDCT的。在音频的准稳态部分信号的滤波器组的高频率分辨率是为了实现高的编码增益是有利的，但这样高的频率分辨率被耦合到一个粗时间分辨率确实变为期间通过产生瞬变信号部分中的问题可听预回声效应。本发明通过应用上的第一滤波器组的输出端的第二非均匀滤波器组，即顶实现了改进的编码/解码质量级联MDCT。根据本发明的编解码器，以重新分组在瞬态或几乎改变音频信号段的时频表示采用开关上附加扩展滤波器组（或多分辨率滤波器组）。通过施加相应的开关控制，避免了预回波效应和高的编码增益和低编码延迟来实现的。

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