An iterated rational filter bank for audio coding

T. Blu
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引用次数: 21

Abstract

This paper proposes a regular third-of-an-octave filter bank for high fidelity audio coding. The originality here is twofold: first, the filter bank is an iterated orthonormal rational filter bank for which the generating filters have been designed so that its outputs closely approximate a wavelet transform. This is different from the known coding algorithms which all use an integer filter bank, and most often a uniform one; second, the masking procedure itself is modelized with the help of a wavelet transform unlike the classical procedure in which a short time spectrum is computed and which gives rise to unwanted preecho effects. The masking procedure is then made equivalent to a quantization procedure. A simple non-optimized algorithm has been worked out in order to show the benefits of such a structure, especially in terms of preecho (which is perceptually inaudible), and the disadvantages, especially as far as delay is concerned.
一种用于音频编码的迭代理性滤波器组
本文提出了一种用于高保真音频编码的规则三倍频倍滤波器组。这里的独创性有两个方面:首先,滤波器组是一个迭代的正交有理滤波器组,其生成滤波器被设计成其输出非常接近小波变换。这与已知的编码算法不同,这些算法都使用整数滤波器组,而且通常是统一的一个;其次,掩蔽过程本身是在小波变换的帮助下建模的,而不像经典过程那样计算短时间谱,从而产生不必要的前回波效应。然后使掩蔽过程等效于量化过程。为了显示这种结构的优点,特别是在前回波(感知上听不到)方面,以及缺点,特别是在延迟方面,我们设计了一个简单的非优化算法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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