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    VERFAHREN ZUM CODIEREN MEHRERER AUDIOSIGNALE
    45.
    发明公开
    VERFAHREN ZUM CODIEREN MEHRERER AUDIOSIGNALE 失效
    方法用于编码多个音频信号

    公开(公告)号：EP0750811A1

    公开(公告)日：1997-01-02

    申请号：EP95907637.0

    申请日：1995-02-02

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

    发明人： HERRE, Jürgen ,  GRILL, Bernhard ,  EBERLEIN, Ernst ,  BRANDENBURG, Karlheinz ,  SEITZER, Dieter

    IPC分类号： H04S5 ,  H03M7 ,  H04B14 ,  H04H20 ,  H04S3

    CPC分类号： H04H20/88 ,  H04S3/02

    摘要： In a process for coding a plurality of audio signals, the left and right-hand basic channels and the central channel are formed into a jointly coded signal by joint stereo coding which is decoded to provide simulated decoded signals. The simulated decoded signals and two surround channels are formed by matrixing by means of a compatibility matrix into compatible signals which are suitable for decoding using existing decoders. To prevent audible interference on account of the high energy contents of the compatible signals which would occur if joint stereo coding and decoding were first performed before matrixing, the compatible signals or the simulated decoded signals dynamically weighted by means of a dynamic correction factor in such a way that the energy of the compatible signals approaches that of signals which would be obtained by the direct matrixing of the two basic channels and the central and surround channels.

    VERFAHREN ZUR DATENREDUKTIOIN BEI DER SPEICHERUNG UND/ODER ÜBERTRAGUNG DIGITALER AUDIOSIGNALE FÜR STUDIOANWENDUNGEN MIT PERCEPTIVER CODIERUNG UND CODE VARIABLER LÄNGE
    47.
    发明公开
    VERFAHREN ZUR DATENREDUKTIOIN BEI DER SPEICHERUNG UND/ODER ÜBERTRAGUNG DIGITALER AUDIOSIGNALE FÜR STUDIOANWENDUNGEN MIT PERCEPTIVER CODIERUNG UND CODE VARIABLER LÄNGE 失效
    过程对于存储DATENREDUKTIOIN和/或数字音频信号演播室传输与应用程序PERCEPTIVER编码和可变长度代码。

    公开(公告)号：EP0632940A1

    公开(公告)日：1995-01-11

    申请号：EP93905148.0

    申请日：1993-02-25

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

    发明人： BRANDENBURG, Karl-Heinz ,  HERRE, Jürgen ,  SEITZER, Dieter

    IPC分类号： G10L19 ,  G10L11 ,  H03M7 ,  H04B14 ,  H04H20

    CPC分类号： H04H20/95 ,  H03M7/42

    摘要： A data compression process is disclosed for the storage and/or transmission of digital audio signals. Known processes, such as ASPEC, allow high quality music to be transmitted in a data stream that contains less than 10 % of the information contained in the data stream used in a CD. Known compression processes do not measure up, however, to the requirements of the professional studio technology, as the subsequent processing of the audio signals that takes place in the studio leads to audible disturbances. The disclosed process is insensitive to subsequent processing, such as tandem coding, mixing or fading. To achieve this insensitivity, the transposition of the audio signal from the time domain to the frequency domain is carried out with perfect reconstruction by means of a filter bank, the psychoacoustic masking effect is utilised to an essentially less extent, and a cascade multidimensional Huffman code is used for coding variable word lengths. This process allows audio signals destined to be used in studio technology to be transmitted at a data rate of 192 kbit/sec per channel.