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1. 发明授权

US06424939B1 Method for coding an audio signal 有权
标题翻译：音频信号编码方法
公开(公告)号：US06424939B1
公开(公告)日：2002-07-23
申请号：US09402684
申请日：1999-10-06
申请人： Jürgen Herre , Uwe Gbur , Andreas Ehret , Martin Dietz , Bodo Teichmann , Oliver Kunz , Karlheinz Brandenburg , Heinz Gerhauser
发明人： Jürgen Herre , Uwe Gbur , Andreas Ehret , Martin Dietz , Bodo Teichmann , Oliver Kunz , Karlheinz Brandenburg , Heinz Gerhauser
IPC分类号： G10L1900
CPC分类号： H04B1/665 , G10L19/028
摘要： A method for coding or decoding an audio signal combines the advantages of TNS processing and noise substitution. A time-discrete audio signal is initially transformed to the frequency domain in order to obtain spectral values of the temporal audio signal. Subsequently, a prediction of the spectral values in relation to frequency is carried out in order to obtain spectral residual values. Within the spectral residual values, areas are detected encompassing spectral residual values with noise properties. The spectral residual values in the noise areas are noise-substituted, whereupon information concerning the noise areas and noise substitution is incorporated into side information pertaining to a coded audio signal. Thus, considerable bit savings in case of transient signals can be achieved.
摘要翻译：用于对音频信号进行编码或解码的方法结合了TNS处理和噪声替换的优点。时间离散音频信号最初被变换到频域以获得时间音频信号的频谱值。随后，进行与频率相关的频谱值的预测，以获得谱残差值。在光谱残差值内，检测到包含具有噪声特性的光谱残差值的区域。噪声区域中的频谱残差值被噪声替代，因此关于噪声区域和噪声替换的信息被并入与编码音频信号有关的侧面信息中。因此，可以实现在瞬态信号的情况下相当可观的位节省。

2. 发明授权

US06766293B1 Method for signalling a noise substitution during audio signal coding 有权
标题翻译：在音频信号编码期间用信号通知噪声替换的方法
公开(公告)号：US06766293B1
公开(公告)日：2004-07-20
申请号：US09367775
申请日：1999-08-18
申请人： Jürgen Herre , Uwe Gbur , Andreas Ehret , Martin Dietz , Bodo Teichmann , Oliver Kunz , Karlheinz Brandenburg , Heinz Gerhäuser
发明人： Jürgen Herre , Uwe Gbur , Andreas Ehret , Martin Dietz , Bodo Teichmann , Oliver Kunz , Karlheinz Brandenburg , Heinz Gerhäuser
IPC分类号： G10L2102
CPC分类号： G10L19/028 , H04B1/665
摘要： In a method for signalling a noise substitution when coding an audio signal, the time-domain audio signal is first transformed into the frequency domain to obtain spectral values. The spectral values are subsequently grouped together to form groups of spectral values. On the basis of a detection establishing whether a group of spectral values is a noisy group or not, a codebook is allocated to a non-noisy or tonal group by means of a codebook number for redundancy coding of the same. If a group is noisy, an additional codebook number which does not refer to a codebook is allocated to it in order to signal that this group is noisy and therefore does not have to be redundancy coded. By signalling noise substitution by means of a Huffman codebook number for noisy groups of spectral values, which are e.g. sections made up of scale factor bands which do not have to be redundancy coded, an opportunity is provided to indicate the presence of a noise substitution in a scale factor band in the bit stream syntax of the MPEG-2 Advanced Audio Coding (AAC) Standard without having to interfere with the basic coding structure and without having to meddle with the structure of the existing bit stream syntax.
摘要翻译：在对音频信号编码时用于发信号通知的方法中，首先将时域音频信号变换成频域以获得频谱值。光谱值随后被分组在一起以形成光谱值组。基于确定一组频谱值是否为噪声组的检测，通过用于冗余编码的码本号将码本分配给非噪声或色调组。如果组噪声，则分配不附加码本的附加码本号，以便发信号通知该组噪声，因此不必进行冗余编码。通过用于噪声组的频谱值的霍夫曼码本号对信号进行信号替换，由不必冗余编码的比例因子带组成的部分提供了一种机会，以指示在MPEG-2高级音频编码（AAC）标准的比特流语法中的比例因子频带中存在噪声替换而不必干扰基本编码结构，而不必介入现有比特流语法的结构。

3. 发明授权

US06771777B1 Process for coding and decoding stereophonic spectral values 有权
标题翻译：立体声频谱值的编码和解码过程
公开(公告)号：US06771777B1
公开(公告)日：2004-08-03
申请号：US09214656
申请日：1999-05-28
申请人： Uwe Gbur , Martin Dietz , Bodo Teichmann , Karlheinz Brandenburg , Heinz Gerhauser , Jürgen Herre , James Johnston
发明人： Uwe Gbur , Martin Dietz , Bodo Teichmann , Karlheinz Brandenburg , Heinz Gerhauser , Jürgen Herre , James Johnston
IPC分类号： H04H500
CPC分类号： H04S1/007
摘要： A method of coding stereo audio spectral values first carries out grouping of those values in scale factor bands, with which scale factors are associated. Sections are formed next, each comprising at least one scale factor band. The spectral values are coded within at least one section with a code book assigned to the section, out of a plurality of code books each with a code book number assigned to it, the number of the code book used being transmitted as side information to the coded stereo audio spectral values. At least one additional code book number is provided, which does not refer to a code book but shows information relevant to the section to which it is assigned. A method of decoding stereo audio spectral values which are partly coded by the intensity stereo process and which have side information uses the relevant information, showing the additional code book numbers, to cancel the existing coding of the stereo audio spectral values.
摘要翻译：对立体声音频频谱值进行编码的方法首先对与比例因子相关联的比例因子频带中的那些值进行分组。接下来形成切片，每个部分包括至少一个比例因子带。频谱值在至少一个部分内被编码，其中分配有代码簿的部分，在分配有代码簿编号的多个代码簿中，使用的代码簿的编号作为辅助信息被发送到编码立体声音频频谱值。提供至少一个附加的代码簿编号，其不涉及代码簿，但是显示与其被分配的部分相关的信息。解码由强度立体声处理部分地编码并且具有侧面信息的立体声音频频谱值的方法使用显示附加码本号码的相关信息来取消立体声音频频谱值的现有编码。

4. 发明授权

US06341165B1 Coding and decoding of audio signals by using intensity stereo and prediction processes 有权
标题翻译：通过使用强度立体声和预测过程对音频信号进行编码和解码
公开(公告)号：US06341165B1
公开(公告)日：2002-01-22
申请号：US09214655
申请日：1999-05-28
申请人： Uwe Gbur , Martin Dietz , Karlheinz Brandenburg , Heinz Gerhauser , Jürgen Herre , Schuyler Quackenbush
发明人： Uwe Gbur , Martin Dietz , Karlheinz Brandenburg , Heinz Gerhauser , Jürgen Herre , Schuyler Quackenbush
IPC分类号： H04R500
CPC分类号： H04B1/665 , G10L19/008 , G10L19/04 , H04B1/667 , H04B14/068 , H04S1/007 , H04S3/00
摘要： In the coding and decoding of stereo audio spectral values both the intensity stereo process and prediction are used in order to achieve high data compression. If intensity stereo coding is active in one section of scale factor bands, the prediction for the right channel in that range is deactivated, whereby the results of the prediction are not used to form the coded stereo audio spectral values. To allow further adaptation of the prediction for the right channel, the predictor of the right channel is fed with stereo audio spectral values for the channel, which again are intensity stereo decoded.
摘要翻译：在立体声音频频谱值的编码和解码中，使用强度立体声处理和预测来实现高数据压缩。如果强度立体声编码在比例因子频带的一个部分中有效，则该范围内的右声道的预测被去激活，由此预测结果不用于形成编码的立体声音频频谱值。为了允许对右声道的预测的进一步调整，右声道的预测器被馈送用于声道的立体声音频频谱值，其再次是强度立体声解码。

5. 发明授权

US5848391A Method subband of coding and decoding audio signals using variable length windows 失效
标题翻译：使用可变长度窗口对音频信号进行编码和解码的方法子带
公开(公告)号：US5848391A
公开(公告)日：1998-12-08
申请号：US678666
申请日：1996-07-11
申请人： Marina Bosi , Grant Davidson , Charles Robinson , Martin Dietz , Uwe Gbur , Oliver Kunz , Karlheinz Brandenburg
发明人： Marina Bosi , Grant Davidson , Charles Robinson , Martin Dietz , Uwe Gbur , Oliver Kunz , Karlheinz Brandenburg
IPC分类号： G10L19/02 , H04B1/66 , G10L5/00
CPC分类号： G10L19/022 , H04B1/665
摘要： A method of encoding time-discrete audio signals comprises the steps of weighting the time-discrete audio signal by means of window functions overlapping each other so as to form blocks, the window functions producing blocks of a first length for signals varying weakly with time and blocks of a second length for signals varying strongly with time. A start window sequence is selected for the transition from windowing with blocks of the first length to windowing with blocks of the second length, whereas a stop window sequence is selected for the opposite transition. The start window sequence is selected from at least two different start window sequences having different lengths, whereas the stop window sequence is selected from at least two different stop window sequences having different lengths. A method of decoding blocks of encoded audio signals selects a suitable inverse transformation as well as a suitable synthesis window as a reaction to side information associated with each block.
摘要翻译：对时间离散音频信号进行编码的方法包括以下步骤：通过彼此重叠的窗口函数对时间离散音频信号进行加权，以形成块，窗口函数产生用于随时间变化的信号的第一长度的块，对于随时间强烈变化的信号的第二长度的块。选择起始窗口序列，用于从具有第一长度的块的窗口到具有第二长度的块的窗口的转换，而针对相反的转换选择停止窗口序列。起始窗口序列从具有不同长度的至少两个不同的开始窗口序列中选择，而停止窗口序列从具有不同长度的至少两个不同的停止窗口序列中选择。对编码音频信号的块进行解码的方法选择合适的逆变换以及合适的合成窗口作为与每个块相关联的侧信息的反应。

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