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首页> 外文会议>Thirty-Fifth Annual Conference on Information Sciences and Systems Vol.2, Mar 21-23, 2001, Baltimore, Maryland >The Nonuniform Modulated Complex Lapped Transform and its Application to Audio Coding
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The Nonuniform Modulated Complex Lapped Transform and its Application to Audio Coding

机译：非均匀调制复重叠变换及其在音频编码中的应用

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摘要

This paper introduces a nonuniform modulated complex lapped transform (NMCLT) as a two-stage extension of the modulated complex lapped transform (MCLT). The NMCLT is a new nonuniform oversampled filter bank with a better combination of time- and frequency-domain localization than previous designs. Adaptive nonuniform sub-band decompositions can be easily generated by varying the number of coefficients brought to the second stage on a frame-by-frame basis. The NMCLT is ideally suited for processing wideband signals such as audio, with reduced time-spreading artifacts. We thus design a scalable audio coder using the NMCLT. Masking functions for different critical Bark bands are first calculated directly from the NMCLT coefficients as perceptual weights and arithmetic coding is then used to compress bit slices of the weighted NMCLT coefficients to generate a perceptually scalable audio bitstream. The loss in coding performance due to oversampling is offset by limiting the amount of redundancy in the transform and exploiting the correlations among the NMCLT basis functions. Experiments show that our new coder outperforms a coder with the modulated lapped transform (MLT) both objectively and subjectively.
机译：本文介绍了非均匀调制复杂重叠变换（NMCLT）作为调制复杂重叠变换（MCLT）的两阶段扩展。 NMCLT是一种新的非均匀过采样滤波器组，比以前的设计具有更好的时域和频域本地化组合。通过逐帧改变带到第二级的系数的数量，可以轻松地生成自适应非均匀子带分解。 NMCLT非常适合处理诸如音频之类的宽带信号，并减少了时间扩散伪影。因此，我们使用NMCLT设计了可扩展的音频编码器。首先直接从NMCLT系数作为感知权重来计算不同关键Bark频带的屏蔽函数，然后使用算术编码来压缩加权NMCLT系数的位片，以生成可感知缩放的音频比特流。通过限制转换中的冗余量并利用NMCLT基函数之间的相关性，可以弥补由于过采样而导致的编码性能损失。实验表明，我们的新编码器在客观和主观上都优于采用调制重叠变换（MLT）的编码器。

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