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1. 发明申请

WO9910886A3 METHOD AND DEVICE FOR DETECTING A TRANSIENT IN A DISCRETE-TIME AUDIOSIGNAL 审中-公开
标题翻译：方法和装置用于记录攻击在时间离散音频信号
公开(公告)号：WO9910886A3
公开(公告)日：1999-06-10
申请号：PCT/EP9803603
申请日：1998-06-15
申请人： FRAUNHOFER GES FORSCHUNG , HILPERT JOHANNES , HERRE JUERGEN , GRILL BERNHARD , BUCHTA RAINER , BRANDENBURG KARLHEINZ , GERHAEUSER HEINZ
发明人： HILPERT JOHANNES , HERRE JUERGEN , GRILL BERNHARD , BUCHTA RAINER , BRANDENBURG KARLHEINZ , GERHAEUSER HEINZ
IPC分类号： H04B1/66
CPC分类号： H04B1/665
摘要： The invention relates to a method for detecting a transient in a discrete-time audiosignal (x(k)) which is carried out entirely in the time domain. Said method comprises a step in which the discrete-time audiosignal is segmented so as generate consecutive segments of identical length with unfiltered discrete-time audiosignals (xs(T), xs(T-1), xs(T-2), ...), after which the discrete-time audiosignal (xs(T)) in a current segment is filtered. Thereafter there are two options: either the energy (Ef(T)) of the filtered discrete-time audiosignal (Ys(T)) in the current segment can be compared with the energy (Ef(T-1)) of the filtered discrete-time audiosignal (Ys(T-1)) in a preceding segment, or a current relationship can be generated between the energy (Ef(T)) of the filtered discrete-time audiosignal (Ys(T)) in the current segment and the energy (Eu(T)) of the unfiltered discrete-time audiosignal (Xs(T)) in the current segment and said current relationship compared with a corresponding preceding relationship. On the basis of the one comparison and/or the other comparison it is determined whether a transient is present in the discrete-time audiosignal.
摘要翻译：在离散时间检测音频信号中的止挡（X（k））的一种方法，在时域中完全进行，并且包括分割所述离散时间的音频信号以与未滤波的离散时间的音频信号（XS（T），XS相同长度的连续片段的步骤（T 生产1），XS（T-2）...）。然后在当前段离散时间的音频信号（XS（T））进行过滤。现在，无论是在与能量当前段的能量滤波的离散时间的音频信号的（EF（T））（YS（T））（EF（T-1））在经滤波的离散时间的音频信号（YS（T-1））的先前片段进行比较时，或者它可以是在当前段中的能量滤波的离散时间的音频信号的（EF（T））（YS（T））和能量未滤波的离散时间的音频信号的（EU（T））（XS（之间的电流关系 T））形成在当前段和该电流关系与前面的对应关系进行比较。上的比较和/或其它比较的基础上它检测到停止是否存在于离散时间的音频信号。

2. 发明申请

WO1997038497A1 PROCESS FOR ENCODING AN AUDIO SIGNAL DIGITALISED AT A LOW SAMPLING FREQUENCY 审中-公开
标题翻译：方法编码具有低采样数字化音频信号
公开(公告)号：WO1997038497A1
公开(公告)日：1997-10-16
申请号：PCT/EP1997000792
申请日：1997-02-19
申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V. , KUNZ, Oliver , DIETZ, Martin , BUCHTA, Rainer , ZELLER, Jürgen , BRANDENBURG, Karlheinz , SIELER, Martin , GERHÄUSER, Heinz
发明人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
IPC分类号： H04B01/66
CPC分类号： H04B1/665
摘要： The invention relates to a process for encoding an audio signal digitalised at a low sampling frequency. A plurality of adjacent frequency lines of the digitalised audio signal, which are co-ordinated with a scale factor band, are encoded with the same scale factor. Adjacent scale factor bands forms a region within which all scale factors are encoded with an identical bit number in each case which is determined according to the largest scale factor of the region. The frequency lines of at least the top region of scale factor bands are encoded with the scale factor O. No scale factor is encoded for the at least top region.
摘要翻译：在用于在每种情况下一个低采样率的多个被分配给一个比例因子频带的数字化音频信号，以相同的比例因子编码的相邻的频率的行编码的数字化音频信号的方法; 其中，相邻的比例因子频带形成的区域被编码在其内的所有换算系数每一个都具有相同比特数，这是根据该区域的最大比例因子来确定。至少比例因子频带的最上部区域被编码以比例因子第0的频率线没有比例因子编码的至少最上部区域。

3. 发明申请

WO1994003895A1 METHOD OF TRANSMITTING DIGITAL DATA WITHOUT FIXED COUPLING BETWEEN THE CLOCK FREQUENCIES AND THE TRANSMISSION FREQUENCY 审中-公开
标题翻译：法的输数字数据之间没有时钟频率和传输速率固定耦合
公开(公告)号：WO1994003895A1
公开(公告)日：1994-02-17
申请号：PCT/DE1993000611
申请日：1993-07-06
申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ... , EBERLEIN, Ernst , KRÄGELOH, Stefan , POPP, Harald , HUPP, Jürgen , SCHERL, Christian , KEYHL, Michael , BUCHTA, Rainer , SEITZER, Dieter
发明人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ...
IPC分类号： G11B20/10
CPC分类号： H04J3/062 , H04L7/005 , H04L7/02
摘要： Described is a method of transmitting digital data, in particular audio data, the method calling for the data to be compressed and encoded in an encoder and then transmitted in encoded form, and subsequently decompressed and decoded in a decoder. In prior art methods, the data are passed at an input clock frequency from a signal source into the encoder and fed at an output clock frequency from the decoder to a signal receiver, the input and output clock frequencies being synchronized. The method proposed avoids the need for this synchronization and is thus significantly more flexible in use. The output clock frequency is generated by a controllable oscillator independently of the input clock frequency. The oscillator is controlled as a function of the internal processing status of the decoder, e.g. in dependence on the loading level of the internal data buffer. In another embodiment of the invention, the oscillator is controlled as a function of the difference between the amount of data arriving in the decoder and the amount being output by the decoder, the amount of data arriving in the decoder being determined from the transmission frequency and the mean data rate.

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