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    • 12. 发明授权
    • Method, apparatus, and medium for detecting frequency extension coding in the coding history of an audio signal
    • 用于在音频信号的编码历史中检测频率扩展编码的方法,装置和介质
    • US09117440B2
    • 2015-08-25
    • US14116113
    • 2012-04-30
    • Harald H. MundtArijit BiswasRegunathan Radhakrishnan
    • Harald H. MundtArijit BiswasRegunathan Radhakrishnan
    • G10L19/00G10L21/02G10L25/03G10L19/008G10L21/038
    • 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。
    • 15. 发明申请
    • Method and System for Encoding Audio Data with Adaptive Low Frequency Compensation
    • 用自适应低频补偿编码音频数据的方法和系统
    • US20130179175A1
    • 2013-07-11
    • US13588890
    • 2012-08-17
    • Arijit BiswasVinay MelkoteMichael SchugGrant A. DavidsonMark S. Vinton
    • Arijit BiswasVinay MelkoteMichael SchugGrant A. DavidsonMark S. Vinton
    • G10L19/00
    • G10L19/028G10L19/0204G10L19/032G10L19/265
    • A method for determining mantissa bit allocation of frequency domain audio data to be encoded, including by performing adaptive low frequency compensation on each frequency band of a set of low frequency bands of the data. The low frequency compensation includes steps of: performing tonality detection on the audio data to generate compensation control data indicative of whether each frequency band in the set has prominent tonal content; and performing low frequency compensation on each frequency band in the set having prominent tonal content, including by correcting a preliminary masking value for each frequency band having prominent tonal content, but not performing low frequency compensation on the audio data in any other frequency band in the set. Other aspects are audio encoding methods including such tonality detection and low frequency compensation steps, and a system configured to perform any embodiment of the inventive method.
    • 一种用于确定要编码的频域音频数据的尾数位分配的方法,包括通过对数据的一组低频带的每个频带执行自适应低频补偿。 低频补偿包括以下步骤:对音频数据执行音调检测,以产生指示该组中的每个频带是否具有突出的音调内容的补偿控制数据; 并且对具有突出音调内容的集合中的每个频带执行低频补偿,包括通过校正具有突出音调内容的每个频带的初步屏蔽值,但不对低频补偿中的任何其他频带中的音频数据执行低频补偿 组。 其他方面是包括这种音调检测和低频补偿步骤的音频编码方法,以及被配置为执行本发明方法的任何实施例的系统。
    • 20. 发明申请
    • PREDICTIVE ENCODING OF A MULTI CHANNEL SIGNAL
    • 多通道信号的预测编码
    • US20090281798A1
    • 2009-11-12
    • US11915004
    • 2006-05-09
    • Albertus Cornelis Den BrinkerArijit Biswas
    • Albertus Cornelis Den BrinkerArijit Biswas
    • G10L19/04
    • 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。