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    A METHOD OF CODING AND DECODING AUDIO SIGNALS
    1.
    发明授权
    A METHOD OF CODING AND DECODING AUDIO SIGNALS 失效
    方法用于编码和解码音频信号

    公开(公告)号：EP0910900B1

    公开(公告)日：2002-10-16

    申请号：EP96939886.6

    申请日：1996-11-21

    申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V. ,  Dolby Laboratories Incorporated

    发明人： DIETZ, Martin ,  GBUR, Uwe ,  KUNZ, Oliver ,  BRANDENBURG, Karlheinz ,  BOSI, Marina ,  DAVIDSON, Grant ,  ROBINSON, Charles

    IPC分类号： H04B1/66

    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.

    A METHOD OF CODING AND DECODING AUDIO SIGNALS
    2.
    发明公开
    A METHOD OF CODING AND DECODING AUDIO SIGNALS 失效
    方法用于编码和解码音频信号

    公开(公告)号：EP0910900A1

    公开(公告)日：1999-04-28

    申请号：EP96939886.0

    申请日：1996-11-21

    申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V. ,  Dolby Laboratories Incorporated

    发明人： DIETZ, Martin ,  GBUR, Uwe ,  KUNZ, Oliver ,  BRANDENBURG, Karlheinz ,  BOSI, Marina ,  DAVIDSON, Grant ,  ROBINSON, Charles

    IPC分类号： G10L19 ,  H04B1

    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.

    EINRICHTUNG ZUR ÜBERPRÜFUNG VON SYSTEMEN ZUR VERARBEITUNG VON AUDIOSIGNALEN
    6.
    发明授权
    EINRICHTUNG ZUR ÜBERPRÜFUNG VON SYSTEMEN ZUR VERARBEITUNG VON AUDIOSIGNALEN 失效
    监听声学信号处理系统的装置

    公开(公告)号：EP0362315B1

    公开(公告)日：1992-12-23

    申请号：EP89902498.8

    申请日：1989-02-25

    申请人： FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.

    发明人： SCHOTT, Hartmut ,  SEITZER, Dieter ,  GERHAUSER, Heinz ,  BRANDENBURG, Karlheinz ,  EBERLEIN, Ernst ,  KRÄGELOH, Stefan ,  KAPUST, Rolf ,  POPP, Harald

    IPC分类号： H04B14/04

    CPC分类号： H04H20/88 ,  H04B14/04

    摘要： The device described has the following features: the device has a first input terminal to which is applied the input signal of the acoustic signal processing system to be monitored, a second input terminal to which is applied the output signal of the system, and a signal processor. The signal processor calculates, by correlation between the two signals present at the two input terminals, the signal delay time of the system to be monitored. The signal processor continuously produces the difference signal from the signal present for a given time interval at the first input terminal and the signal present later at the second input terminal after the signal delay time. The signal processor calculates the spectral composition of the signal present at the first input terminal during the given time interval and the corresponding difference signal. The signal processor calculates the threashold of hearing of a human ear from the spectral composition of the signal present at the first input terminal and compares it with the corresponding difference signal.

    VERFAHREN UND VORRICHTUNG ZUM ERZEUGEN EINES DATENSTROMS UND VERFAHREN UND VORRICHTUNG ZUM ABSPIELEN EINES DATENSTROMS
    8.
    发明授权
    VERFAHREN UND VORRICHTUNG ZUM ERZEUGEN EINES DATENSTROMS UND VERFAHREN UND VORRICHTUNG ZUM ABSPIELEN EINES DATENSTROMS 有权
    方法和设备，用于生成数据流的方法和设备用于播放数据流

    公开(公告)号：EP1151561B1

    公开(公告)日：2004-04-28

    申请号：EP99963548.5

    申请日：1999-12-15

    申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

    发明人： RUMP, Niels ,  KOLLER, Jürgen ,  BRANDENBURG, Karlheinz

    IPC分类号： H04H1/00 ,  H04N7/16

    CPC分类号： H04N7/163 ,  H04H60/14 ,  H04H60/73 ,  H04N21/23476

    摘要： The invention relates to a method for generating a second data stream from a first data stream containing a first start block and a first user data block comprising user data. According to said method the first start block is extracted (116) from the first data stream. Next the second start block for the second data stream is generated (118), after which at least a part of the first start block, which part contains information making it possible to trace the origins of the user data, is integrated (120) into the second start block. Finally the second user data block containing the same user data is generated (122) so that a complete second data stream can be obtained. The method provided for by the invention allows for the device-specific encoding of user data, makes it possible to obtain a flexible device-specific copy for other devices of a user and, notably, provides complete references as to the origins of a copy, which in turn permits effective copyright protection.

    VERFAHREN UND VORRICHTUNG ZUM ERZEUGEN EINES VERSCHLÜSSELTEN NUTZDATENSTROMS UND VERFAHREN UND VORRICHTUNG ZUM ENTSCHLÜSSELN EINES VERSCHLÜSSELTEN NUTZDATENSTROMS
    9.
    发明授权
    VERFAHREN UND VORRICHTUNG ZUM ERZEUGEN EINES VERSCHLÜSSELTEN NUTZDATENSTROMS UND VERFAHREN UND VORRICHTUNG ZUM ENTSCHLÜSSELN EINES VERSCHLÜSSELTEN NUTZDATENSTROMS 有权
    的方法和设备，用于生成解密加密的用户数据流加密的用户数据流AND METHOD AND APPARATUS

    公开(公告)号：EP1133849B1

    公开(公告)日：2002-06-12

    申请号：EP99965472.6

    申请日：1999-12-15

    申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

    发明人： RUMP, Niels ,  KOLLER, Jürgen ,  BRANDENBURG, Karlheinz

    IPC分类号： H04L9/00 ,  H04N7/167

    CPC分类号： H04N7/1675 ,  H04N21/2347 ,  H04N21/26613 ,  H04N21/4405 ,  H04N21/8355

    摘要： The invention relates to a method for generating an encoded user data stream which contains a start block and a block containing encoded user data. According to said method a user data code is generated for a user data coding algorithm for encoding user data (102). To obtain the block containing encoded user data of the user data stream, the user data are encoded (104) by means of the user data code and user data coding algorithm generated. A part of the user data stream is processed (106) so as to derive information which characterizes that part of the user data stream. This information is combined with the user data by means of an invertible logic operation (108) so that a base value is obtained. The base value is encoded by means of a code consisting of two different codes and using an asymmetrical encoding method (110), the two different codes being the public or private code for the asymmetrical encoding method. An output value is obtained which is an encoded version of the user data code and the output value is then entered into the start block so that the user data stream is completed (112). Unauthorized changes to the start block or the user data themselves result in automatic destruction of the user data.

    摘要翻译： 在用于在加密的有效载荷的方法的数据流产生包含报头和包含加密有效载荷数据的块的方法，生成用于加密的有效载荷数据的有效载荷数据的加密算法的有效载荷数据密钥。 所述有效载荷数据是使用所生成的有效载荷的数据密钥和有效载荷数据的加密算法，以获得含有有效载荷数据流的加密的净荷数据的块加密。 有效载荷数据流的一部分进行处理，以推导出信息标识所述有效载荷数据流的一部分。 的信息与通过可逆逻辑连接的装置中的有效载荷数据连接，以获得一个基本值。 该基本值是使用的两个键通过在非对称加密方法是从海誓山盟不同密钥最后加密，则两个不同的密钥作为公共和私有密钥分别对非对称加密方法来获得在输出值为的加密版本 有效载荷数据密钥。 输出值最终输入到报头以完成有效载荷流。 数据本身，其被未被授权的报头和有效载荷的改变，导致对所述有效载荷数据的自动破坏。