公开(公告)号：US06502069B1

公开(公告)日：2002-12-31

申请号：US09530001

申请日：2000-04-20

申请人： Bernhard Grill ,  Jürgen Herre ,  Bodo Teichmann ,  Karlheinz Brandenburg ,  Heinz Gerhauser

发明人： Bernhard Grill ,  Jürgen Herre ,  Bodo Teichmann ,  Karlheinz Brandenburg ,  Heinz Gerhauser

IPC分类号： G10L1912

CPC分类号： H04B1/665 ,  H04B14/046

摘要： The present invention permits a combination of a scalable audio coder with the TNS technique. In a method for coding time signals sampled in a first sampling rate, second time signals are first generated whose sampling rate is smaller than the first sampling rate. The second time signals are then coded according to a first coding algorithm and written into a bit stream. The coded second time signals are, however, decoded again, and, like the first time signals, transformed into the frequency domain. From a spectral representation of the first time signals, TNS prediction coefficients are calculated. The transformed output signal of the coder/decoder with the first coding algorithm, like the spectral representation of the first time signal, undergoes a prediction over the frequency to obtain residual spectral values for both signals, though only the prediction coefficients calculated on the basis of the first time signals are used. These two signals are evaluated against each other. The evaluated residual spectral values are then coded by means of a second coding algorithm to obtain coded evaluated residual spectral values, which, together with the side information containing the calculated prediction coefficients, are written into the bit stream.

摘要翻译： 本发明允许可扩展音频编码器与TNS技术的组合。 在对以第一采样率采样的时间信号进行编码的方法中，首先生成采样率小于第一采样率的第二时间信号。 然后根据第一编码算法对第二时间信号进行编码并写入比特流。 然而，编码的第二时间信号被再次解码，并且像第一次信号一样被转换成频域。 根据第一时间信号的频谱表示，计算TNS预测系数。 使用第一编码算法的编码器/解码器的变换输出信号，如第一时间信号的频谱表示，对频率进行预测，以获得两个信号的残差频谱值，尽管仅基于 第一次使用信号。 这两个信号被相互评估。 然后通过第二编码算法对所评估的残差频谱值进行编码，以获得编码的估计残差频谱值，其与包含计算的预测系数的边信息一起写入比特流。

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。

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。

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。

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。

公开(公告)号：US06629078B1

公开(公告)日：2003-09-30

申请号：US09445894

申请日：1999-12-13

申请人： Bernhard Grill ,  Bodo Teichmann ,  Karlheinz Brandenburg

发明人： Bernhard Grill ,  Bodo Teichmann ,  Karlheinz Brandenburg

IPC分类号： H04S100

CPC分类号： G10L19/24 ,  G10L19/008 ,  G10L19/0212 ,  H04S1/007

摘要： A method of coding a time-discrete stereo signal, the stereo signal having a first and a second channel, permits scalable stereo coding. At first, a mono signal is formed from the stereo signal, which is then coded, whereupon the coded mono signal is transmitted to a bit stream. Thereafter, the coded mono singal is decoded again, whereupon stereo information is formed on the basis of the coded/decoded mono signal and the first and second channels, with such stereo information being coded and being also written into the bit stream in order to obtain a bit stream comprising a complete coded monolayer as well as a layer with coded stereo information.

摘要翻译： 一种编码时分离立体声信号的方法，具有第一和第二声道的立体声信号允许可缩放的立体声编码。 首先，从立体声信号形成单声道信号，然后将其编码，由此编码的单声道信号被发送到比特流。 此后，再次对编码的单声道进行解码，由此基于编码/解码的单声道信号和第一和第二声道形成立体声信息，这些立体声信息被编码并且也被写入比特流，以便获得 包括完整编码单层的比特流以及具有编码的立体声信息的层。

公开(公告)号：US06826525B2

公开(公告)日：2004-11-30

申请号：US10183139

申请日：2002-06-25

申请人： Johannes Hilpert ,  Jürgen Herre ,  Bernhard Grill ,  Rainer Buchta ,  Karlheinz Brandenburg ,  Heinz Gerhäuser

发明人： Johannes Hilpert ,  Jürgen Herre ,  Bernhard Grill ,  Rainer Buchta ,  Karlheinz Brandenburg ,  Heinz Gerhäuser

IPC分类号： G10L1900

CPC分类号： H04B1/665

摘要： A method for detecting a transient in a discrete-time audio signal is performed completely in the time domain and includes the step of segmenting the discrete-time audio signal so as to generate consecutive segments of the same length with unfiltered discrete-time audio signals xs(T−1). The discrete-time audio signal in a current segment is subsequently filtered. Then either the energy of the filtered discrete-time audio signal in the current segment can be compared with the energy of the filtered discrete-time audio signal in a preceding segment or a current relationship between the energy of the filtered discrete-time audio signal in the current segment and the energy of the unfiltered discrete-time audio signal in the current segment can be formed and this current relationship compared with a preceding corresponding relationship. On the basis of the one and/or the other of these comparisons it is detected whether a transient is present in the discrete-time audio signal.

摘要翻译： 用于检测离散时间音频信号中的瞬态的方法在时域中完全执行，并且包括分段离散时间音频信号以便生成具有未滤波的离散时间音频信号xs的相同长度的连续片段的步骤 （T-1）。 随后过滤当前片段中的离散时间音频信号。 然后可以将当前段中滤波的离散时间音频信号的能量与前一段中滤波的离散时间音频信号的能量或滤波后的离散时间音频信号的能量之间的当前关系进行比较 可以形成当前段的当前段和未过滤离散时间音频信号的能量，并将该当前关系与先前的对应关系进行比较。 基于这些比较中的一个和/或另一个，检测离散时间音频信号中是否存在瞬态。

公开(公告)号：US5918203A

公开(公告)日：1999-06-29

申请号：US894844

申请日：1997-08-13

申请人： Jurgen Herre ,  Ernst Eberlein ,  Bernhard Grill ,  Karlheinz Brandenburg ,  Heinz Gerhauser

发明人： Jurgen Herre ,  Ernst Eberlein ,  Bernhard Grill ,  Karlheinz Brandenburg ,  Heinz Gerhauser

IPC分类号： G01H3/08 ,  G10L19/00 ,  H03G5/00 ,  H04R3/04 ,  G10L3/00

CPC分类号： H03G5/005

摘要： The tonality of an audio signal is determined by a method which includes the steps of blockwise frequency transforming a digital input signal x(n) to create a real positive-value representation X(k) of the input signal, where k designates the index of a frequency line, and determining the tonality T of the signal component for the frequency line k according to the following equation: ##EQU1## where F.sub.1 is the filter function of a first digital filter with a first, differentiating characteristic, F.sub.2 is the filter function of a second digital filter with a second, flat or integrating characteristic or with a characteristic which is less strongly differentiating than the first characteristic, and d.sub.1 and d.sub.2 are integer constants which, depending on the filter parameters, are so chosen that the delays of the filters are compensated for in each case.

摘要翻译： PCT No.PCT / EP96 / 00550 Sec。 371日期1997年8月13日 102（e）日期1997年8月13日PCT 1996年2月9日PCT公布。 WO96 / 25649 PCT出版物 日期1996年8月22日音频信号的音调由包括对数字输入信号x（n）进行块状频率变换以产生输入信号的实数正值表示X（k）的步骤的方法确定，其中 k表示频率线的索引，并且根据以下等式确定频率线k的信号分量的音调T：其中F1是具有第一微分特性的第一数字滤波器的滤波器函数，F2是 第二数字滤波器的滤波器功能具有第二，平坦或积分特性或具有与第一特性不太强区别的特性，d1和d2是整数常数，其根据滤波器参数被选择为使得延迟 在每种情况下补偿滤波器。

公开(公告)号：US06453282B1

公开(公告)日：2002-09-17

申请号：US09424596

申请日：1999-11-24

申请人： Johannes Hilpert ,  Jürgen Herre ,  Bernhard Grill ,  Rainer Buchta ,  Karlheinz Brandenburg ,  Heinz Gerhäuser

发明人： Johannes Hilpert ,  Jürgen Herre ,  Bernhard Grill ,  Rainer Buchta ,  Karlheinz Brandenburg ,  Heinz Gerhäuser

IPC分类号： G10L1900

CPC分类号： H04B1/665

摘要： A method for detecting a transient in a discrete-time audio signal is performed completely in the time domain and includes the step of segmenting the discrete-time audio signal as to generate consecutive segments of the same length with unfiltered discrete-time audio signals. The discrete-time audio signal in a current segment is filtered. Either the energy of the filtered discrete-time audio signal in the current segment is compared with the energy of the filtered discrete-time audio signal in a preceding segment or a current relationship between the energy of the filtered discrete-time audio signal in the current segment and the energy of the unfiltered discrete-time audio signal in the current segment is formed and this current relationship compared with a preceding corresponding relationship. Whether a transient is present in the discrete-time audio signal is detected using one and/or the other of these comparisons.

摘要翻译： 用于检测离散时间音频信号中的瞬态的方法在时域中完全执行，并且包括分段离散时间音频信号以生成具有未滤波离散时间音频信号的相同长度的连续片段的步骤。 当前片段中的离散时间音频信号被过滤。 将当前片段中滤波的离散时间音频信号的能量与先前片段中滤波的离散时间音频信号的能量或电流中滤波后的离散时间音频信号的能量之间的当前关系进行比较 形成当前段中未经滤波的离散时间音频信号的能量，并将该当前关系与先前的对应关系进行比较。 使用这些比较中的一个和/或另一个来检测离散时间音频信号中是否存在瞬态。

公开(公告)号：US5014318A

公开(公告)日：1991-05-07

申请号：US439394

申请日：1989-10-25

申请人： Hartmut Schott ,  Dieter Seitzer ,  Heinz Gerhauser ,  Karlheinz Brandenburg ,  Ernst Eberlein ,  Stefan Krageloh ,  Rolf Kapust ,  Harald Popp

发明人： Hartmut Schott ,  Dieter Seitzer ,  Heinz Gerhauser ,  Karlheinz Brandenburg ,  Ernst Eberlein ,  Stefan Krageloh ,  Rolf Kapust ,  Harald Popp

IPC分类号： G10L11/00 ,  G10L21/02 ,  G11B20/18 ,  H04B14/04 ,  H04H20/88

CPC分类号： H04H20/88 ,  H04B14/04

摘要： Disclosed is an apparatus for checking audio signal processing systems. The apparatus has the following features:the apparatus is provided with a first input connection, to which the input signal of the audio processing system to be checked is transmitted, a second input connection, to which the output signal of said system is transmitted, and a signal processor.said signal processor ascertains the signal delay time of said system to be checked by means of correlating said signals received at said two input connections,said signal processor always composes the difference signal from said signal received at said first input connection during a specific time span and said signal received at said second input connection, lagging by the signal delay time,said signal processor ascertains the spectral composition of said signal received at said first input connection during said specific time span and of said respective difference signal,said signal processor ascertains the hearing threshold of the human ear from said spectral composition and compares the ascertained hearing threshold with the respective difference signal.

摘要翻译： PCT No.PCT / DE89 / 00110 Sec。 371日期：1989年10月25日 102（e）日期1989年10月25日PCT提交1989年2月25日PCT公布。 公开号WO89 / 08357 日期为1989年9月8日。公开是用于检查音频信号处理系统的装置。 该装置具有以下特征：该装置具有第一输入连接，待检查的音频处理系统的输入信号被发送到该第一输入连接，传输所述系统的输出信号的第二输入连接;以及 信号处理器。 所述信号处理器通过将在所述两个输入连接处接收到的所述信号相关来确定要检查的所述系统的信号延迟时间，所述信号处理器总是在特定时间跨度期间组合来自在所述第一输入连接处接收的所述信号的差信号， 所述信号在所述第二输入连接处被接收，滞后于所述信号延迟时间，所述信号处理器确定在所述特定时间跨度期间在所述第一输入连接处接收到的所述信号的频谱组成以及所述各个差分信号，所述信号处理器确定听觉 阈值，并将所确定的听力阈值与相应的差分信号进行比较。