CN1308949C - 具有自适应噪声整形调制的音频信号处理系统 - Google Patents
具有自适应噪声整形调制的音频信号处理系统 Download PDFInfo
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Abstract
提供音频信号处理技术,该处理技术包括通过噪声整形调制(7)将音频信号转换(5)为数字信号,以一个预定的采样率将数字信号压缩编码(3)为压缩的数字信号,以及提供压缩的数字信号,其中响应至少一个参数(P)自适应地进行噪声整形调制。
Description
本发明涉及音频信号处理技术,例如,用于记录或传送,本处理技术包括如下步骤:通过噪声整形调制将音频信号转换为数字信号,以一个预定的采样率将数字信号压缩编码为一个压缩的数字信号,以及提供压缩的数字信号。
国际专利申请WO98/16014公开了一个用于音频信号数据压缩的数据压缩装置。此数据压缩装置包括一个用于接收音频信号的输入终端,一个1—比特A/D转换器用于音频信号的A/D转换以获得一个比特流信号,一个无损耗编码器用于在比特流信号上实现一个无损数据压缩步骤以获得一个数据压缩的比特流信号,以及一个输出终端用于提供压缩的数据比特流信号。另外,还公开了包括数据压缩装置的记录装置和传送装置。另外,还公开了用于将由数据压缩装置提供的压缩数据比特流信号进行数据扩展的数据扩展装置,以及一个包括包括数据扩展装置的再生装置和接收器装置。
本发明的目的是提供有效的压缩。为此,本发明提供一种信号处理方法和设备以及一种在独立权利要求中定义的用于记录或者传送的装置。实施例定义在从属权利要求中。
按照本发明的第一方面,噪声整形调制是响应于至少一个参数而自适应的。本发明基于认识到通过使噪声整形调制自适应,可以使编码器的压缩增益被影响。这是因为在噪声整形调制中的一个变化影响了音频信号中的相关。更高相关性的信号被更好的预测,因此可以更好地被压缩。本发明的这个方面对于用于直接流数字(DSD)信号,举例来说存储在超级音频激光唱盘(SACD),编码的无损耗编码器是特别有利的。
通过在噪声整形调制中使用自适应西格玛—德尔塔(∑-Δ,sigma-delta)调制,通过动态范围上做一定的让步可以获得压缩增益的增加。收听测试证实了SACD记录媒体的巨大的动态范围在感觉上显得不重要,因为举例来说动态范围从105dB到95dB的减小很难被察觉。尤其是在高信号电平,由于通常的掩蔽效应使得听众对于动态范围的轻微减少是不敏感的。试验显示存在几种方式,通过它们西格玛—德尔塔调制器的结构可被修改或者改变以提供来自编码算法的较高的压缩增益,例如使用较低阶的西格玛—德尔塔调制器和或在调制器高频噪声中创建结构。
在本发明的一个优选实施例中,音频信号到数字信号的转变包括按照自适应噪声整形调制(举例来说就是西格玛—德尔塔调制)的音频信号的低通滤波。因此,但是对于某种程度的由于来自低通滤波的带宽限制所引起的信号质量降低的代价来说,可获得压缩增益进一步增加。
输入音频信号可作为模拟信号提供,其中自适应西格玛—德尔塔调制作为噪声整形调制的一部分而实施,其中音频信号转换成例如由DSD信号格式描述的1—比特比特流信号的数字信号。
音频信号也可以作为例如一个1—比特比特流信号的数字信号用于转换,上述转换可通过以一定速率对一个模拟音频信号进行初始附加采样而获得,该速率是用于压缩编码的预定采样率的一个倍数。结合上述优选实施例,低通滤波和噪声整形调制因此可以包括1—比特比特流信号到预定采样速率的下行采样。因此按照44.1kHz采样频率的64倍的预定采样率,附加采样可以在采样频率的256倍速率实现。在该采样等级可以实现任何信号处理。
接下来本发明将参考附图被进一步介绍,其中附图1和附图2是按照本发明的信号处理装置的两个可选择实施例的简化框图,
附图3到5是表示相应于音频信号的一个参数,实现西格玛—德尔塔调制和/或低通滤波的可选择方式的框图,
附图6是用于附图1和2中可选结构中任何一个的第五阶西格玛—德尔塔调制器的简化拓扑结构图,
附图7是表示用于不同阶的西格玛—德尔塔调制器的压缩增益的图表,
附图8是表示在高频范围给西格玛—德尔塔调制器增加一个额外极点所产生效果的图表,以及
附图9是表示压缩增益和信号功率在所选择的音频信号的频带中的关系的图表。
在附图1的图中一个模拟输入音频信号提供给包括噪声音频调制器2的转换器1,一个数字信号由该转换器被提供给编码器3。典型的该调制器2可以是以比特流信号形式提供数字信号的西格玛—德尔塔调制器,例如该信号可以是DSD格式的1—比特比特流信号。
典型的,无损耗编码器3具有合成帧结构,其中通过该结构输入信号提供给它,合成帧结构分裂成一些小部分使编码器开发音频信号的短期伪稳定特性,同时西格玛—德尔塔调制器1量化错误的伪稳定特性和预测,例如通过线性FIR滤波器4,在编码之前尽可能消除连续信源采样之间的相关性或者冗余度,它可在不同程度熵编码形式中实现,例如使用类Huffman编码算法或者算术编码。
因此,编码器3提供所示的可以以应用于记录在例如SACD盘记录载体上记录的压缩数字信号,但是也可以用于通过传输媒质进行传输。
附图1中所示的结构中,按照本发明的实施例,通过相应于参数P而对西格玛—德尔塔调制器1进行修改或改变将会增加由编码器2提供的压缩的无损耗编码信号的压缩增益。按照本发明,对于西格玛—德尔塔调制器的结构的变化或者改变,例如使用一个较低阶调制器或者在调制器的高频噪声中创建结构,从下面的描述中,几个可用的方法将变得清楚。
在附图2中可选择的结构,一个数字音频输入信号在提供给无损耗编码器3之前提供给转换器5。转换器5包括一个低通滤波器6,通过它输入信号的带宽被限制,举例来说,达到与DSD格式的规定带宽一致的100kHz或者甚至到由自适应西格玛—德尔塔调制器7所规定的50kHz。虽然并不绝对必要,但低通滤波器7也更适于响应音频信号的至少一个参数而自适应,它最好是相同的,但是也可以与用于西格玛—德尔塔调制器7的变化或修改的信号参数不同。在简单实施例中,如果低通滤波器7是自适应的,那么西格玛—德尔塔调制器可以是非自适应的。
在转换器5中,低通滤波器6和自适应西格玛—德尔塔调制器7的结合提供用于数字输入信号的再量化。如附图2中所示的信号处理装置可包括多个持续预处理模块5以获得压缩增益的期望增加。
在转换器5中的低通滤波器6举例来说,是第七阶IIRChesbyshev类型1滤波器,通常由一个或多个如附图2中所示的预处理阶段所获得的压缩增益增加比附图1中所示的结构要高,然而由于带宽限制将导致信号质量的降低。
显然,附图2中所示的一个或多个转换器5也可用在附图1中所示的调制器1和解码器2之间。
自适应西格玛—德尔塔调制器1或7可以是第三、第五或第七阶,提供如附图7中图表所示的范围从用于第三阶调制器的3.7倍或更高直到用于第七阶调制器的2.3倍或者更低的压缩增益。然而应该强调的是通常较低阶调制器的使用,由于在声频带上较低的动态范围将导致音频质量的降低。
按照本发明的一个实施例,为了将压缩增益的增加限制为所需要的无损耗编码信号的一部分,调制器2中的西格玛—德尔塔调制响应于音频信号的至少一个参数P改变或者修改。这典型地是在高信号电平,其中由编码器3提供的压缩通常会降低。如附图3中所示,这可通过集成有信号电平检测器10的反馈环装置9来实现。换句话说,如附图4中所示的适应包括一个响应于从编码器3中的预测滤波器4所获得的数据的控制装置11,如附图5中所示从信号功率提取器和相关器12所获得的一个控制信号将在下面进一步解释。
附图6中的图表显示一个用于附图1-5中的任何一种结构的第五阶西格玛—德尔塔调制器的优选拓扑结构。图示的拓扑结构基于多重谐振器结构,其中在谐振器R1,R2,…R5的反馈环中的系数c1,c2…c5决定环路滤波器的极点(或者噪声传输函数的零点)。图示的拓扑结构用于第五阶调制器,相同的拓扑结构只需通过添加另一个谐振器结构就可用于第七阶调制器。
如上所述,附图7显示一个作为用于10kHz音频正弦波信号的振幅swa的一个函数表示用于不同西格玛—德尔塔调制器阶的压缩增益cg的图表,图解说明需要以声频带中的量化噪声增加为代价所获得的用于较低阶调制器的压缩增益的增加。
在调制器的通常的设计中,极点通常被放置在声频带中,按照本发明所优选的另一个实施例,然而如附图8中作为用于第五级西格玛—德尔塔调制器的极点位置pp的一个函数的不同信号压缩增益的图形表示中所示的,具有至少一个位于声频带外的极点来在西格玛—德尔塔频谱的另外的几乎平的高频部分产生附加结构。
在西格玛—德尔塔调制器标准设计中,典型的极点放置在8.7,15.7和19.5kHz处,其中按照本发明,最后的极点最好从20kHz区域移到较高频率。如图表中所示,200kHz周围的极点分布可以导致一个更坏的压缩增益,因为该极点位置太接近于调制器从第五阶到第一阶运转状态的点,由此调制器变得几乎不稳定。
另一方面,300kHz或者更高处周围的极点位置将导致压缩增益的显著增加。这可通过信号噪声性能的轻微降低而实现,对于适合的调制器这是可以接受的,因为额外的噪声在人耳较不敏感的频率波段的高端引入。
极点位置从20kHz区域到较高频率的转移会受到给现有的调制器结构增加单独的额外带通滤波器(例如平行于低通环路滤波器)的影响。通过使用第二阶的巴特沃斯带通滤波器作为这样一个平行的滤波器,可以实现压缩增益的显著增长,同时导致调制器对于较大的输入保持稳定,并且在声频带中的信噪比性能相对于不变的调制器实际上保持不变。
按照本发明如附图5中所示的用于自适应西格玛—德尔塔调制器和/或在预处理设备中的自适应低通滤波器的另一个方法,提供可以存储在例如SACD盘的记录媒体上的大量数据的估计,并且使用该估计用于西格玛—德尔塔调制器和/或低通滤波器的自适应控制。
理论上,为了提供该估计,可选择它确定只用于(例如随机)所选的音乐记录的子集的压缩增益,并且使用该估计作为用于对整段音乐的平均增益指示。
然而实际上音乐的典型片段具有一个带有显著短期相关性的非常宽的增益有效区域,一段音乐中非常小的一部分用于通过具有期望精度的该方法获得估计。由于该操作不可避免的所需的大量计算,该方法不能认为是一个可接收的可行的解决方法。
按照本发明在DSD格式比特流信号的信号功率之间的相关和压缩增益被用于提供所期望的估计。
调查已论证在音频信号频带,举例来说,上至20kHz,由于作为信号功率函数的用于压缩增益的非常平坦的响应曲线,它的自相关非常弱,通过转移到在正常可听见范围上的频率波段,举例来说,从20到50kHz,可观察到一个来自如附图9中所示的图表中表示的非常陡峭的响应曲线的完全可用的相关。初步的有限试验显示了以这种方式可获得精度在1%以内的估计。
应该注意上述的实施例是示例性的而不是限制发明,本领域的技术人员可以设计多种可替代的实施例而不背离附加权利要求的范围。在权利要求中位于括号之间的任何参考标记不应被解释为对权利要求的限制。单词‘包括’不排除那些列在权利要求中的其它部件或者步骤。本发明可通过包含多个分离元件的硬件装置而实现,也可通过恰当编程的计算机而实现。在装置权利要求列举了多个装置,这些装置中的一些可通过一个和同类的硬件体现。在彼此不同的从属权利中描述某些方法这一事实不代表这些方法的合并不能产生有益效果。
Claims (12)
1.一种音频信号处理方法,该法包括以下步骤:
通过噪声整形调制将音频信号转换为数字信号,该噪声整形调制响应至少一个参数而进行自适应,
以一个预定的采样率将数字信号压缩编码为一个压缩的数字信号,以及
提供压缩的数字信号,
该方法的特征在于所述转换步骤包括在所述自适应噪声整形调制之前对所述音频信号进行低通滤波。
2.按权利要求1所述的方法,其中所述低通滤波响应于至少一个参数自适应。
3.按权利要求2所述的方法,其中所述自适应噪声整形调制和/或所述自适应低通滤波由反馈控制来控制,所述至少一个参数包括从所述数字信号获得的信号电平。
4.按权利要求1所述的方法,其中自适应噪声整形调制包括先于非自适应的西格玛-德尔塔调制的自适应低通滤波。
5.按权利要求1所述的方法,其中所述压缩编码包括所述数字信号的线性预测滤波,其中所述至少一个参数基于从所述预测滤波获得的数据。
6.按权利要求1所述的方法,其中所述至少一个参数包括在所述数字信号的一个选择频率波段中的一个信号功率。
7.按权利要求6所述的方法,其中所选择的频率波段高于20kHz。
8.按权利要求1所述的方法,其中自适应噪声整形调制包括具有至少一个高于20kHz的极点的自适应西格玛-德尔塔调制。
9.按权利要求8所述的方法,其中所述极点位于从300kHz或者更高开始的高频范围中。
10.按权利要求1所述的方法,其中自适应噪声整形调制是一种多重谐振器结构,该结构具有一个作为与低通滤波器平行的带通滤波器的环路滤波器。
11.一种用于处理音频信号的设备,该设备包括:
用于通过噪声整形调制将音频信号转换为数字信号的装置,该噪声整形调制响应至少一个参数而进行自适应,
用于以一个预定的采样率将数字信号压缩编码为一个压缩的数字信号的装置,以及
用于提供压缩的数字信号的装置,
该设备的特征在于所述用于转换的装置包括在所述自适应噪声整形调制之前对所述音频信号进行低通滤波的低通滤波器。
12.一种用于传输或记录音频信号的设备,该设备包括:
获得音频信号的一个输入单元,
如权利要求11中所述的一个音频信号处理设备,其用于处理该音频信号以获得一个被处理的音频信号,
一个用于输出所述被处理的音频信号的输出单元。
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US20020163455A1 (en) | 2002-11-07 |
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US20040230427A1 (en) | 2004-11-18 |
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