CN1599983A - 用于检测谱的量化的方法 - Google Patents

用于检测谱的量化的方法 Download PDF

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CN1599983A
CN1599983A CNA02824110XA CN02824110A CN1599983A CN 1599983 A CN1599983 A CN 1599983A CN A02824110X A CNA02824110X A CN A02824110XA CN 02824110 A CN02824110 A CN 02824110A CN 1599983 A CN1599983 A CN 1599983A
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spectrum
sorted
amplitude
value
frequency domain
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CN1599983B (zh
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彼得·耶奥格·鲍姆
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Thomson Licensing SAS
International Digital Madison Patent Holding SAS
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/66Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for reducing bandwidth of signals; for improving efficiency of transmission
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/66Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for reducing bandwidth of signals; for improving efficiency of transmission
    • H04B1/665Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for reducing bandwidth of signals; for improving efficiency of transmission using psychoacoustic properties of the ear, e.g. masking effect

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)

Abstract

本发明包括已经根据心理声学原理压缩的音频数据的量化谱的获取。该谱可以借助于分类后(取对数后)的幅度大小的差别来识别。本发明的所要解决的问题是找到针对谱的量化度的灵敏指示符的基础。该计算的结果针对量化谱示出了:在相同量化等级的幅度处的几个较小值、以及在其中幅度已经达到较高的量化等级的位置处的明显峰值,而未量化的谱典型地类似于噪声。

Description

用于检测谱的量化的方法
技术领域
本发明涉及一种音频编码和再次编码的方法。
背景技术
按照符合心理声学原理的压缩方式来传送音频数据,并由接收机对该音频数据进行解码。对这些符合心理声学原理的解码后的数据重新压缩将造成质量的损失。如果可以检测并重用原始压缩的参数,则可以忽略这样的损失,例如,见EP-A-0746913。
用于检测这些针对使用谱的编解码器的这些参数的方法是利用不同参数的谱测试类计算。如果分析的参数(变换起始、窗类型、谱长度)与编解码器参数匹配,则所述的谱具有量化的外观。由于编解码器和分析计算的计算不精确性或不同的计算精度,量化后的谱看起来具有些微的噪声,即,相同量化等级的幅度将不具有相同的大小。
难度在于:谱是否具有“量化特性”,从而可以针对其对谱量化的影响,分析谱的不同参数。
由于压缩伴随着特定谱线的消失(参考在Herre,Jürgen;Michael Schug:Analysis of Decompressed Audio-The″InverseDecoder″,第109次AES会议,Los Angeles,2000年),对这些谱线进行计算,所述谱线小于阈值。
发明内容
本发明包括已经根据心理声学原理压缩的音频数据的量化谱的获取。该谱可以借助于分类后的(和取对数后的)幅度大小的差别来识别。
本发明的所要解决的问题是找到针对谱的量化度的灵敏指示符的基础。量化谱的结果示出了在相同量化等级的幅度处的几个较小值、以及在其中幅度已经达到较高的量化等级的位置处的明显峰值,而未量化的谱典型地类似于噪声。
该问题由权利要求1中所公开的方法来解决。
原则上,本发明的方法适合于串联编解码器(tandem codecs)(解码-编码)。本发明还用在利用未知编解码器进行的逆向工程的过程中。
在各个从属权利要求中公开了本发明的优选的附加实施例。
附图说明
参考附图来描述本发明的典型实施例,在附图中,
图1示出了解码后的音频信号的量化谱;
图2示出了未量化谱的幅度;
图3示出了分类后的图1)中的幅度;
图4示出了分类后的图2)中的幅度;
图5示出了从图3)中的差分后的分类谱;
图6示出了从图4)中的差分后的分类谱;
图7示出了检测器的简单方框图。
具体实施方式
图1示出了解码后的信号的量化谱的幅度。分析的参数(变换起始、窗类型、谱长度)与编解码器的参数匹配,因此,所述谱具有量化的外观。
与图1相比,图2示出了未量化的谱的幅度。因此,这些参数不与编解码器的参数匹配。
图3示出了从图1中的分类幅度,而图4示出了从图2中的未量化谱的分类幅度。
图5示出了从图3中的差分后的分类谱;而图6示出了从图4中的未量化谱的差分后的分类谱。
图5和6的比较将清楚地示出量化谱(图5)和非量化谱(图6)之间的差别。
下一个步骤是计算这些谱中的标量,这些标量将用作针对量化的指示符。
本发明将结合逆向编码器一起使用。通常,必须针对另一传输对编码和解码后的音频信号进行第二次编码。如果在第二编码器中的编码器参数与第一编码器中的编码器参数相同,则可以使编解码器的人为因素最小。逆向编码器设法获取这些参数。在这种情况下,如果谱看起来受到量化,则必须对其进行确定,这可以借助于本发明来实现。
逆向编码器的另一用途,因此也是本发明的另一用途在于再设计编解码器,以认证在知识产权领域的侵权。
图7示出了本发明的简单方框图。本发明的目的将时域抽样转换到频域,然后对频域中的幅度进行分类,之后,可选地对这些分类后的幅度取对数,并且最后评估分类后的谱值,例如,差分和检测第一峰值。

Claims (7)

1.一种检测谱的量化的方法,
其特征在于:指示符基于分类后的谱的绝对值,其中包括以下步骤:
将解码后的信号的时间抽样转换为频域(1);
对频域中的幅度进行分类(2);
作为选择,对分类后的幅度取对数(3);
评估分类后的谱(4)。
2.根据权利要求1所述的方法,其特征在于:对谱值取对数。
3.根据权利要求1或2所述的方法,其特征在于:对分类的谱值的幅度进行差分。
4.根据权利要求1到3之一所述的方法,其特征在于:由窗对所述值进行加权。
5.根据权利要求3或4所述的方法,其特征在于:指示符是第一峰值的位置和/或高度的函数。
6.根据权利要求3或4所述的方法,其特征在于:指示符是倍增的分类后的谱和移位一条线的分类后的谱的和。
7.一种检测谱量化的设备,
其特征在于:指示符基于分类后的谱绝对值,包括:
用于通过例如MDCT或FFT将时域抽样转换到频域的装置(1);
用于对频域中的幅度进行分类的装置(2);
用于对分类后的幅度取对数的可选的装置(3);
用于评估分类后的谱值,例如,差分和检测第一峰值的装置(4)。
CN02824110XA 2001-12-06 2002-11-23 用于检测谱的量化的方法和设备 Expired - Fee Related CN1599983B (zh)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP01250431A EP1318611A1 (en) 2001-12-06 2001-12-06 Method for retrieving a sensitive criterion for quantized spectra detection
EP01250431.2 2001-12-06
PCT/EP2002/013188 WO2003049306A1 (en) 2001-12-06 2002-11-23 Method for detecting the quantization of spectra

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CN1599983B CN1599983B (zh) 2010-04-14

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EP (2) EP1318611A1 (zh)
JP (1) JP2005512137A (zh)
KR (1) KR100977961B1 (zh)
CN (1) CN1599983B (zh)
AU (1) AU2002356717A1 (zh)
DE (1) DE60203543T2 (zh)
WO (1) WO2003049306A1 (zh)

Cited By (2)

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CN101772805B (zh) * 2007-06-07 2013-02-27 三星电子株式会社 正弦音频编码的方法和装置及正弦音频解码的方法和装置
CN101689369B (zh) * 2007-04-12 2013-03-06 三星电子株式会社 用于编码和解码分音的幅度的方法和装置

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US7536302B2 (en) * 2004-07-13 2009-05-19 Industrial Technology Research Institute Method, process and device for coding audio signals
KR20090008611A (ko) * 2007-07-18 2009-01-22 삼성전자주식회사 오디오 신호의 인코딩 방법 및 장치
TWI800092B (zh) * 2010-12-03 2023-04-21 美商杜比實驗室特許公司 音頻解碼裝置、音頻解碼方法及音頻編碼方法
US9311923B2 (en) * 2011-05-19 2016-04-12 Dolby Laboratories Licensing Corporation Adaptive audio processing based on forensic detection of media processing history
JP5714180B2 (ja) * 2011-05-19 2015-05-07 ドルビー ラボラトリーズ ライセンシング コーポレイション パラメトリックオーディオコーディング方式の鑑識検出
US10733998B2 (en) 2017-10-25 2020-08-04 The Nielsen Company (Us), Llc Methods, apparatus and articles of manufacture to identify sources of network streaming services
US10629213B2 (en) 2017-10-25 2020-04-21 The Nielsen Company (Us), Llc Methods and apparatus to perform windowed sliding transforms
US10726852B2 (en) 2018-02-19 2020-07-28 The Nielsen Company (Us), Llc Methods and apparatus to perform windowed sliding transforms
US11049507B2 (en) 2017-10-25 2021-06-29 Gracenote, Inc. Methods, apparatus, and articles of manufacture to identify sources of network streaming services

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US5341457A (en) * 1988-12-30 1994-08-23 At&T Bell Laboratories Perceptual coding of audio signals
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CN101689369B (zh) * 2007-04-12 2013-03-06 三星电子株式会社 用于编码和解码分音的幅度的方法和装置
CN101772805B (zh) * 2007-06-07 2013-02-27 三星电子株式会社 正弦音频编码的方法和装置及正弦音频解码的方法和装置

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EP1461871A1 (en) 2004-09-29
DE60203543T2 (de) 2005-09-15
KR100977961B1 (ko) 2010-08-24
EP1318611A1 (en) 2003-06-11
WO2003049306A1 (en) 2003-06-12
JP2005512137A (ja) 2005-04-28
US20050015241A1 (en) 2005-01-20
CN1599983B (zh) 2010-04-14
DE60203543D1 (de) 2005-05-04
US7318023B2 (en) 2008-01-08
KR20050058262A (ko) 2005-06-16
EP1461871B1 (en) 2005-03-30
AU2002356717A1 (en) 2003-06-17

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