宽带音频可扩展小波编码的感知零树

A. Aggarwal, V. Cuperman, K. Rose, A. Gersho
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引用次数: 8

摘要

本文介绍了一种宽带音频信号可扩展编码的新算法。该技术基于感知零树方法对双正交小波变换系数进行量化。计算小波系数的初始零树估计,然后根据感知阈值对系数进行标量量化。每帧的小波分解和编码参数的选择是根据信源的特征,采用速率失真准则。编码器的可扩展性是由于树形结构,它可以随着比特率的降低而优雅地降级。初步主观测试表明,每个样本的平均比特率在1.5到2.5比特之间,质量接近透明。
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Perceptual zerotrees for scalable wavelet coding of wideband audio
This paper introduces a new algorithm for scalable coding of wideband audio signals. The technique is based on quantization of bi-orthogonal wavelet transformed coefficients using a perceptual zerotree method. An initial zerotree estimate of the wavelet coefficients is computed, followed by scalar quantization of the coefficients according to perceptual thresholds. The choice of wavelet decomposition and encoding parameters for each frame is adapted to the source characteristics employing a rate distortion criterion. The scalability of the coder is due to the tree structure, which enables graceful degradation with decrease in bit rate. Preliminary subjective tests indicate near-transparent quality for average bit rates in the range of 1.5 to 2.5 bits per sample.
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