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    • 21. 发明申请
    • APPARATUS AND METHOD FOR CONSTRUCTING A MULTI-CHANNEL OUTPUT SIGNAL OR FOR GENERATING A DOWNMIX SIGNAL
    • 用于构造多通道输出信号或产生下行信号的装置和方法
    • WO2005069274A1
    • 2005-07-28
    • PCT/EP2005/000408
    • 2005-01-17
    • FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.AGERE SYSTEMS INC.HERRE, JürgenFALLER, Christof
    • HERRE, JürgenFALLER, Christof
    • G10L19/00
    • G10L19/008H04S3/02H04S2420/03
    • The apparatus for constructing a multi-channel output signal using an input signal and parametric side information, the input signal including the first input channel and the second input channel derived from an original multi-channel signal, and the parametric side information describing interrelations between channels of the multi-channel original signal uses base channels for synthesizing (324) first and second output channels on one side of an assumed listener position, which are different from each other. The base channels are different from each other because of a coherence measure. Coherence between the base channels (for example the left and the left surround reconstructed channel) is reduced by calculating (322) a base channel for one of those channels by a combination of the input channels, the combination being determined by the coherence measure. Thus, a high subjective quality of the reconstruction can be obtained because of an approximated original front/back coherence.
    • 用于使用输入信号和参数侧信息构造多通道输出信号的装置,包括从原始多通道信号导出的第一输入通道和第二输入通道的输入信号以及描述通道之间的相互关系的参数侧信息 多通道原始信号使用基本通道来合成(324)彼此不同的假定收听者位置一侧的第一和第二输出声道。 由于一致性测量,基本通道彼此不同。 通过通过输入通道的组合计算(322)这些通道中的一个通道的基本通道来减小基本通道(例如左和左环绕重构通道)之间的相干性,该组合由相干性测量确定。 因此,由于近似的原始前/后相干性,可以获得重建的高主观质量。
    • 27. 发明申请
    • AUDIO SIGNAL DECORRELATOR
    • 音频信号装饰
    • WO2007118583A1
    • 2007-10-25
    • PCT/EP2007/002759
    • 2007-03-28
    • FRAUNHOFER-GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.HERRE, JürgenBUCHNER, Herbert
    • HERRE, JürgenBUCHNER, Herbert
    • H04M9/08G10L19/00
    • H04M9/08
    • An audio signal decorrelator (100) for deriving an output audio signal (170) from an input audio signal (112) comprises a frequency analyzer (110) for extracting a first partial signal (120) and a second partial signal (122) from the input audio signal, the first partial signal being descriptive of an audio content in a first audio frequency range, the second partial signal being descriptive of an audio content in a second audio frequency range, the first audio frequency range having higher frequencies compared to the second audio frequency range. The audio signal decorrelator further comprises a partial signal modifier (140) for modifying the first partial signal, to obtain a first processed partial signal (150), and the second partial signal, to obtain a second processed partial signal (152), so that a modulation amplitude of a time variant phase shift or time variant delay applied to the first partial signal is higher than a modulation amplitude of a time variant phase shift or a time variant delay applied to the second partial signal, or for modifying only the first partial signal, so that a time variant phase shift or a time variant delay is applied to the first partial signal. The audio signal decorrelator further comprises a signal combiner (160) for combining the first processed partial signal and the second processed partial signal, or for combining the first processed partial signal and the second partial signal, to obtain an output audio signal (170). The audio signal decorrelator allows for an efficient decorrelation of audio signals, which is adapted to the human auditory perception.
    • 用于从输入音频信号(112)导出输出音频信号(170)的音频信号解相关器(100)包括用于从第一部分信号(120)提取第一部分信号(120)和第二部分信号(122)的频率分析器(110) 输入音频信号,所述第一部分信号描述第一音频频率范围内的音频内容,所述第二部分信号描述第二音频频率范围内的音频内容,所述第一音频频率范围具有比所述第二音频频率更高的频率 音频范围。 音频信号解相关器还包括用于修改第一部分信号,获得第一处理部分信号(150)和第二部分信号的部分信号修改器(140),以获得第二处理部分信号(152),使得 施加到第一部分信号的时变相移或时变延迟的调制幅度高于施加到第二部分信号的时变相移或时变延迟的调制幅度,或者仅修改第一部分信号 信号,使得时变相移或时变延迟被施加到第一部分信号。 音频信号解相关器还包括用于组合第一处理部分信号和第二处理部分信号或用于组合第一处理部分信号和第二部分信号的信号组合器(160),以获得输出音频信号(170)。 音频信号解相关器允许音频信号的有效去相关,其适应于人的听觉感知。