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    • 3. 发明申请
    • AUDIO SIGNAL DECORRELATOR, MULTI CHANNEL AUDIO SIGNAL PROCESSOR, AUDIO SIGNAL PROCESSOR, METHOD FOR DERIVING AN OUTPUT AUDIO SIGNAL FROM AN INPUT AUDIO SIGNAL AND COMPUTER PROGRAM
    • 音频信号解码器,多声道音频信号处理器,音频信号处理器,用于从输入音频信号和计算机程序传送输出音频信号的方法
    • US20090304198A1
    • 2009-12-10
    • US12296698
    • 2007-03-28
    • Jürgen HerreHerbert Buchner
    • Jürgen HerreHerbert Buchner
    • H04B3/20
    • H04M9/082G10L19/008G10L2021/02082
    • An audio signal decorrelator for deriving an output audio signal from an input audio signal has a frequency analyzer for extracting from the input audio signal a first partial signal descriptive of an audio content in a first audio frequency range and a second partial signal descriptive of an audio content in a second audio frequency range having higher frequencies compared to the second audio frequency range. A partial signal modifier for modifies the first and second partial signals, to obtain first and second processed partial signals, so that a modulation amplitude of a time variant phase shift or time variant delay applied to the first partial signal is higher than that applied to the second partial signal, or for modifying only the first partial signal. A signal combiner combines the first and second processed partial signals, or combines the first processed partial signal and the second partial signal, to obtain an output audio signal.
    • 用于从输入音频信号导出输出音频信号的音频信号解相关器具有频率分析器,用于从输入音频信号中提取描述第一音频频率范围内的音频内容的第一部分信号和描述音频的第二部分信号 与第二音频范围相比具有较高频率的第二音频频率范围内的内容。 一种部分信号修改器,用于修改第一和第二部分信号,以获得第一和第二处理的部分信号,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一部分信号的调制幅度 第二部分信号,或仅用于修改第一部分信号。 信号组合器组合第一和第二处理的部分信号,或组合第一处理部分信号和第二部分信号,以获得输出音频信号。
    • 4. 发明授权
    • Method for signalling a noise substitution during audio signal coding
    • 在音频信号编码期间用信号通知噪声替换的方法
    • US06766293B1
    • 2004-07-20
    • US09367775
    • 1999-08-18
    • Jürgen HerreUwe GburAndreas EhretMartin DietzBodo TeichmannOliver KunzKarlheinz BrandenburgHeinz Gerhäuser
    • Jürgen HerreUwe GburAndreas EhretMartin DietzBodo TeichmannOliver KunzKarlheinz BrandenburgHeinz Gerhäuser
    • G10L2102
    • G10L19/028H04B1/665
    • In a method for signalling a noise substitution when coding an audio signal, the time-domain audio signal is first transformed into the frequency domain to obtain spectral values. The spectral values are subsequently grouped together to form groups of spectral values. On the basis of a detection establishing whether a group of spectral values is a noisy group or not, a codebook is allocated to a non-noisy or tonal group by means of a codebook number for redundancy coding of the same. If a group is noisy, an additional codebook number which does not refer to a codebook is allocated to it in order to signal that this group is noisy and therefore does not have to be redundancy coded. By signalling noise substitution by means of a Huffman codebook number for noisy groups of spectral values, which are e.g. sections made up of scale factor bands which do not have to be redundancy coded, an opportunity is provided to indicate the presence of a noise substitution in a scale factor band in the bit stream syntax of the MPEG-2 Advanced Audio Coding (AAC) Standard without having to interfere with the basic coding structure and without having to meddle with the structure of the existing bit stream syntax.
    • 在对音频信号编码时用于发信号通知的方法中,首先将时域音频信号变换成频域以获得频谱值​​。 光谱值随后被分组在一起以形成光谱值组。 基于确定一组频谱值是否为噪声组的检测,通过用于冗余编码的码本号将码本分配给非噪声或色调组。 如果组噪声,则分配不附加码本的附加码本号,以便发信号通知该组噪声,因此不必进行冗余编码。 通过用于噪声组的频谱值的霍夫曼码本号对信号进行信号替换, 由不必冗余编码的比例因子带组成的部分提供了一种机会,以指示在MPEG-2高级音频编码(AAC)标准的比特流语法中的比例因子频带中存在噪声替换 而不必干扰基本编码结构,而不必介入现有比特流语法的结构。
    • 8. 发明授权
    • Apparatus for analyzing an audio signal with regard to rhythm information of the audio signal by using an autocorrelation function
    • 用于通过使用自相关函数来分析关于音频信号的节奏信息的音频信号的装置
    • US07012183B2
    • 2006-03-14
    • US10713691
    • 2003-11-14
    • Jürgen HerreJan RohdenChristian UhleMarkus Cremer
    • Jürgen HerreJan RohdenChristian UhleMarkus Cremer
    • G10H1/40
    • G10L19/0208G10H1/40G10H2210/076G10H2250/135G10L25/06G10L25/90
    • An apparatus for analyzing an audio signal with regard to rhythm information of the audio signal by using an autocorrelation function comprises a filter bank for separating the audio signal into at least two sub-band signals. The sub-band signals are examined with regard to periodicities by an autocorrelation function, to obtain rhythm raw-information for the at least two sub-band signals. To reduce or eliminate the ambiguities of the autocorrelation function for periodical signals, the rhythm raw-information is postprocessed to obtain post-processed rhythm raw-information for the sub-band signal. The rhythm information of the audio signal is established based on the postprocessed rhythm raw-information. By the sub-band-wise ACF postprocessing, ACF ambiguities are already eliminated where they originate, and rhythm portions are added at double tempi, which an autocorrelation function processing does normally not provide, so that, as a result, a more robust determination of the rhythm information of the audio signal arises.
    • 用于通过使用自相关函数来分析关于音频信号的节奏信息的音频信号的装置包括用于将音频信号分离成至少两个子带信号的滤波器组。 通过自相关函数检查子带信号的周期性,以获得用于至少两个子带信号的节奏原始信息。 为了减少或消除周期信号的自相关函数的不确定性,后处理节奏原始信息以获得用于子带信号的后处理节奏原始信息。 基于后处理的节奏原始信息建立音频信号的节奏信息。 通过子带式ACF后处理,ACF模糊度已经被消除,它们起源,并且节奏部分以双重温度被添加,自相关函数处理通常不提供,因此,结果是更稳健地确定 音频信号的节奏信息出现。
    • 10. 发明授权
    • Audio signal decorrelator, multi channel audio signal processor, audio signal processor, method for deriving an output audio signal from an input audio signal and computer program
    • 音频信号去相关器,多通道音频信号处理器,音频信号处理器,用于从输入音频信号和计算机程序中导出输出音频信号的方法
    • US08538037B2
    • 2013-09-17
    • US12296698
    • 2007-03-28
    • Jürgen HerreHerbert Buchner
    • Jürgen HerreHerbert Buchner
    • H04B15/00H04M9/08H04M1/00H04M1/38
    • H04M9/082G10L19/008G10L2021/02082
    • An audio signal decorrelator for deriving an output audio signal from an input audio signal has a frequency analyzer for extracting from the input audio signal a first partial signal descriptive of an audio content in a first audio frequency range and a second partial signal descriptive of an audio content in a second audio frequency range having higher frequencies compared to the second audio frequency range. A partial signal modifier modifies the first and second partial signals, to obtain first and second processed partial signals, so that a modulation amplitude of a time variant phase shift or time variant delay applied to the first partial signal is higher than that applied to the second partial signal, or for modifying only the first partial signal. A signal combiner combines the first and second processed partial signals, or combines the first processed partial signal and the second partial signal, to obtain an output audio signal.
    • 用于从输入音频信号导出输出音频信号的音频信号解相关器具有频率分析器,用于从输入音频信号中提取描述第一音频频率范围内的音频内容的第一部分信号和描述音频的第二部分信号 与第二音频范围相比具有较高频率的第二音频频率范围内的内容。 部分信号修改器修改第一和第二部分信号,以获得第一和第二处理的部分信号,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调制幅度 部分信号,或仅修改第一部分信号。 信号组合器组合第一和第二处理的部分信号,或组合第一处理部分信号和第二部分信号,以获得输出音频信号。