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    • 6. 发明申请
    • PREDICTIVE ENCODING OF A MULTI CHANNEL SIGNAL
    • 多通道信号的预测编码
    • WO2006126115A2
    • 2006-11-30
    • PCT/IB2006/051445
    • 2006-05-09
    • KONINKLIJKE PHILIPS ELECTRONICS N.V.DEN BRINKER, Albertus, C.BISWAS, Arijit
    • DEN BRINKER, Albertus, C.BISWAS, Arijit
    • G10L19/00G10L19/008G10L19/06
    • G10L19/008G10L19/06
    • A multi channel encoder (100) comprises a multi channel linear predictive analyzer (105) for linear predictive coding of a multi channel signal. A prediction controller (101) comprises a prediction parameter generator (301) which generates linear prediction coding parameter matrices for the multi channel signal which are then mapped to reflection matrices. The reflection matrices may specifically be normalized backward or forward reflection matrices. The reflection matrices are encoded by a reflection parameter encoder (305) and combined with other encoded data in a multiplexer (109) to generate encoded data for the multi channel signal. The reflection parameter encoder (305) may specifically decompose the reflection matrices using an Eigenvalue decomposition or a singular value decomposition and the resulting data may be quantized for transmission. A decoder (200) receives the encoded data and obtains the prediction parameters by performing the inverse operation.
    • 多通道编码器(100)包括用于多通道信号的线性预测编码的多通道线性预测分析器(105)。 预测控制器(101)包括预测参数生成器(301),该预测参数生成器生成多信道信号的线性预测编码参数矩阵,然后映射到反射矩阵。 反射矩阵可以具体地是归一化的反向或正向反射矩阵。 反射矩阵由反射参数编码器(305)编码并与多路复用器(109)中的其它编码数据组合以产生用于多通道信号的编码数据。 反射参数编码器(305)可以使用特征值分解或奇异值分解来具体地分解反射矩阵,并且可以量化所得到的数据以进行传输。 解码器(200)接收编码数据并通过执行逆运算来获得预测参数。
    • 7. 发明申请
    • FORENSIC DETECTION OF PARAMETRIC AUDIO CODING SCHEMES
    • 参考音频编码方案的审查
    • WO2012158333A1
    • 2012-11-22
    • PCT/US2012/035785
    • 2012-04-30
    • DOLBY LABORATORIES LICENSING CORPORATIONDOLBY INTERNATIONAL ABMUNDT, Harald, H.BISWAS, ArijitRADHAKRISHNAN, Regunathan
    • MUNDT, Harald, H.BISWAS, ArijitRADHAKRISHNAN, Regunathan
    • G10L19/00G10L21/02
    • G10L19/00G10L19/008G10L21/02G10L21/038G10L25/03
    • The present document relates to audio forensics, notably the blind detection of traces of parametric audio encoding / decoding. In particular, the present document relates to the detection of parametric frequency extension audio coding, such as spectral band replication (SBR) or spectral extension (SPX), from uncompressed waveforms such as PCM (pulse code modulation) encoded waveforms. A method for detecting frequency extension coding history in a time domain audio signal is described. The method may comprise transforming the time domain audio signal into a frequency domain, thereby generating a plurality of subband signals in a corresponding plurality of subbands comprising low and high frequency subbands; determining a degree of relationship between subband signals in the low frequency subbands and subband signals in the high frequency subbands; wherein the degree of relationship is determined based on the plurality of subband signals; and determining frequency extension coding history if the degree of relationship is greater than a relationship threshold.
    • 本文件涉及音频取证,特别是盲目检测参数音频编码/解码的痕迹。 特别地,本文件涉及从诸如PCM(脉冲编码调制)编码波形的未压缩波形检测参数频率扩展音频编码,例如频谱带复制(SBR)或频谱扩展(SPX)。 描述了用于检测时域音频信号中的频率扩展编码历史的方法。 该方法可以包括将时域音频信号变换成频域,从而在包括低频和高频子带的相应多个子带中产生多个子带信号; 确定低频子带中的子带信号与高频子带中的子带信号之间的关系程度; 其中所述关系度基于所述多个子带信号来确定; 以及如果所述关系度大于关系阈值,则确定频率扩展编码历史。
    • 9. 发明申请
    • COMPLEXITY SCALABLE PERCEPTUAL TEMPO ESTIMATION
    • 复杂可伸缩的概率估计
    • WO2011051279A1
    • 2011-05-05
    • PCT/EP2010/066151
    • 2010-10-26
    • DOLBY INTERNATIONAL ABBISWAS, ArijitHOLLOSI, DaniloSCHUG, Michael
    • BISWAS, ArijitHOLLOSI, DaniloSCHUG, Michael
    • G10H1/40
    • G10H1/40G10H2210/076G10H2230/015G10H2240/075
    • The present document relates to methods and systems for estimating the tempo of a media signal, such as audio or combined video/audio signal. In particular, the document relates to the estimation of tempo perceived by human listeners, as well as to methods and systems for tempo estimation at scalable computational complexity. A method and system for extracting tempo information of an audio signal from an encoded bit-stream of the audio signal comprising spectral band replication data is described. The method comprises the steps of determining a payload quantity associated with the amount of spectral band replication data comprised in the encoded bit-stream for a time interval of the audio signal; repeating the determining step for successive time intervals of the encoded bit- stream of the audio signal, thereby determining a sequence of payload quantities; identifying a periodicity in the sequence of payload quantities; and extracting tempo information of the audio signal from the identified periodicity.
    • 本文件涉及用于估计媒体信号(诸如音频或组合视频/音频信号)的速度的方法和系统。 特别地,该文件涉及人类听众感知的节奏的估计,以及用于以可缩放的计算复杂度进行速度估计的方法和系统。 描述用于从包括频谱带复制数据的音频信号的编码比特流中提取音频信号的速度信息的方法和系统。 该方法包括以下步骤:在音频信号的时间间隔中确定与包含在编码比特流中的频谱带复制数据量相关联的有效载荷数量; 重复该音频信号的编码比特流的连续时间间隔的确定步骤,从而确定有效载荷量的序列; 识别有效载荷数量序列中的周期; 以及从所识别的周期中提取音频信号的速度信息。