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    VORRICHTUNG UND VERFAHREN ZUM UNTERDRÜCKEN EINER RÜCKKOPPLUNG
    1.
    发明授权
    VORRICHTUNG UND VERFAHREN ZUM UNTERDRÜCKEN EINER RÜCKKOPPLUNG 有权
    DEVICE AND METHOD FOR抑制反馈

    公开(公告)号：EP1518441B1

    公开(公告)日：2006-01-04

    申请号：EP03811364.3

    申请日：2003-11-06

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

    发明人： SPORER, Thomas ,  NEUBAUER, Christian

    IPC分类号： H04R3/02 ,  H04R25/00

    CPC分类号： H04R25/453 ,  H04R3/02

    摘要： The invention relates to a device for suppressing a feedback in an environment containing a microphone (10) and a loudspeaker (13), comprising a device (20), for embedding a test signal in a loudspeaker signal, a microphone signal, or a modified microphone signal, preferably using a psychoacoustic marking threshold by means of a pseudo-noise test signal, a device (50) for determining a property of a transmission path in the environment between the loudspeaker (13) and the microphone (10), using the embedded test signal and the microphone signal, a filter (40), for filtering the loudspeaker signal, to give a filtered loudspeaker signal, whereby the filter may be adjusted with regard to the filter characteristics thereof by the determining device (50) to match the same to the properties of the transmission path and a device (30) for subtracting the filtered loudspeaker signal from the microphone signal to give a modified microphone signal in which the feedback as a result of the loudspeaker is reduced. The feedback suppression concept achieves an effective feedback suppression without a loss in audio quality in particular without detracting from the artistic work of an artist.

    VORRICHTUNG UND VERFAHREN ZUM EINBETTEN EINES WASSERZEICHENS IN EIN AUDIOSIGNAL
    4.
    发明授权
    VORRICHTUNG UND VERFAHREN ZUM EINBETTEN EINES WASSERZEICHENS IN EIN AUDIOSIGNAL 有权
    装置和方法嵌入水印的音频信号

    公开(公告)号：EP1382038B1

    公开(公告)日：2005-06-29

    申请号：EP02740586.9

    申请日：2002-05-10

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

    发明人： HERRE, Jürgen ,  KULESSA, Ralph ,  NEUBAUER, Christian ,  SIEBENHAAR, Frank

    IPC分类号： G11B20/00

    CPC分类号： G10L19/018 ,  G10L19/02

    摘要： The invention relates to a method for embedding a watermark in an audio signal, according to which a spectral representation of the audio signal and a spectral representation of the watermark signal are first determined (14, 16). The spectral representation of the watermark signal is then processed, based on a psychoacoustic masking threshold (24) of the audio signal (22). The processed watermark signal is combined with the audio signal (18), to obtain an audio signal furnished with a watermark. The spectral representation of the watermark signal is processed iteratively in the following way: a predetermined watermark initial value (26) is first selected; the interference that has been introduced into the spectral representation by the predetermined watermark initial value after a quantization of the spectral representation of the audio signal, is determined (28). If the interference introduced by the watermark initial value is greater than the predetermined interference threshold (32), the watermark initial value is then modified until said interference introduced into the spectral representation of the audio signal by a modified watermark initial value after quantization, is less than or equal to the predetermined interference threshold. The modified watermark initial value that is obtained at the end of the iteration is used as a processed watermark signal to be combined with the audio signal. It is therefore no longer possible to weaken or remove a watermark by quantization. The invention provides complete control over the energy of the watermark, in order to ensure that a watermark is embedded into an audio signal with either the best possible degree of detectability or the best possible audio quality.

    VORRICHTUNG UND VERFAHREN ZUM BESTIMMEN EINER IMPULSANTWORT UND VORRICHTUNG UND VERFAHREN ZUM VORFUEHREN EINES AUDIOSTUECKS
    8.
    发明授权
    VORRICHTUNG UND VERFAHREN ZUM BESTIMMEN EINER IMPULSANTWORT UND VORRICHTUNG UND VERFAHREN ZUM VORFUEHREN EINES AUDIOSTUECKS 有权
    VORRICHTUNG UND VERFAHREN ZUM BESTIMMEN EINER IMPULSANTWORT UND VORRICHUNG UND VERFAHREN ZUM VORFUEHREN EINES AUDIOSTUECKS

    公开(公告)号：EP1514450B1

    公开(公告)日：2005-12-07

    申请号：EP03775317.5

    申请日：2003-11-06

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

    发明人： SPORER, Thomas ,  NEUBAUER, Christian

    IPC分类号： H04S7/00

    CPC分类号： H04S7/30 ,  H04R29/007 ,  H04S2420/13

    摘要： The invention relates to a device, which is provided for determining a pulse response in an environment, inside of which a loudspeaker (10) and a microphone (12) are placed, and which operates while using an audio signal. A device (20) for effecting the spectral coloring of a test signal, which is preferably a pseudo noise signal, operates while using a psychoacoustic masking threshold of the audio signal in order to obtain a colored test signal that is embedded in the audio signal in order to obtain a measurement signal that can be fed to the loudspeaker (10). A device (30, 32) for determining the pulse response preferably carries out a cross-correlation of a reaction signal, which is received from the environment via the microphone, and of the test signal or of the colored test signal. This enables a pulse response of an environment to be determined even while playing an audio piece in order to provide an optimal description of the environment for a wavefield synthesis.

    摘要翻译： 本发明涉及一种设备，其用于确定扬声器（10）和麦克风（12）放置在其内部并且在使用音频信号的同时操作的环境中的脉冲响应。 用于实现测试信号（其优选为伪噪声信号）的光谱着色的设备（20）在使用音频信号的心理声学掩蔽阈值的同时操作，以便获得嵌入在音频信号中的彩色测试信号， 以获得可以馈送到扬声器（10）的测量信号。 用于确定脉冲响应的设备（30,32）优选地执行经由麦克风从环境接收的反应信号与测试信号或彩色测试信号的互相关。 这使得即使在播放音频片段时也能够确定环境的脉冲响应，以便为波场合成提供最佳环境描述。

    VERFAHREN UND VORRICHTUNG ZUM EINBRINGEN VON INFORMATIONEN IN EINEN DATENSTROM SOWIE VERFAHREN UND VORRICHTUNG ZUM CODIEREN EINES AUDIOSIGNALS
    9.
    发明授权
    VERFAHREN UND VORRICHTUNG ZUM EINBRINGEN VON INFORMATIONEN IN EINEN DATENSTROM SOWIE VERFAHREN UND VORRICHTUNG ZUM CODIEREN EINES AUDIOSIGNALS 有权
    方法和设备中引入数据流的方法和设备信息以音频信号编码

    公开(公告)号：EP1212857B1

    公开(公告)日：2003-03-12

    申请号：EP00969432.4

    申请日：2000-10-05

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

    发明人： NEUBAUER, Christian ,  HERRE, Jürgen ,  BRANDENBURG, Karlheinz ,  ALLAMANCHE, Eric

    IPC分类号： H04H1/00 ,  H04B1/66

    CPC分类号： H04H20/31 ,  G10L19/018 ,  G10L19/02 ,  H04B1/707

    摘要： An inventive method for introducing information into a data stream including data about spectral values representing a short-term spectrum of an audio signal first performs a processing of the data stream to obtain the spectral values of the short-term spectrum of the audio signal. Apart from that, the information to be introduced are combined with a spread sequence to obtain a spread information signal, whereupon a spectral representation of the spread information is generated which will then be weighted with an established psychoacoustic maskable noise energy to generate a weighted information signal, wherein the energy of the introduced information is substantially equal to or below the psychoacoustic masking threshold. The weighted information signal and the spectral values of the short-term spectrum of the audio signal will then be summed and afterwards processed again to obtain a processed data stream including both audio information and information to be introduced. By the fact that the information to be introduced are introduced into the data stream without changing to the time domain, the block rastering underlying the short-term spectrum will not be touched, so that introducing a watermark will not lead to tandem encoding effects.