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首页> 外文期刊>Circuits Systems and Signal Processing >PERCEPTUAL AUDIO CODING USING SINUSOIDAL/OPTIMUM WAVELET REPRESENTATION
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PERCEPTUAL AUDIO CODING USING SINUSOIDAL/OPTIMUM WAVELET REPRESENTATION

机译:使用正弦/最优小波表示的感知音频编码

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摘要

A perceptual audio coder, in which each audio segment is adaptively analyzed using either a sinusoidal or an optimum wavelet basis according to the time-varying characteristics of the audio signals, has been constructed. The basis optimization is achieved by a novel switched filter bank scheme, which switches between a uniform filter bank structure (discrete cosine transform) and a non-uniform filter bank structure (discrete wavelet transform). A major artifact of the International ISO/Moving Pictures Experts Group (MPEG) audio coding standard (MPEG-I layers 1 and 2) known as pre-echo distortion which uses a uniform filter bank structure for audio signal analysis, is almost eliminated in the proposed coder. A perceptual masking model implemented using a high-resolution wavelet packet filter bank with 27 subbands, closely mimicking the critical bands of the human auditory system, is employed in this audio coder. The resulting scheme is a variable bit-rate audio coder, which provides compression ratios comparable to MPEG-I layers 1 and 2 with almost transparent quality.
机译:已经构造了一种感知音频编码器,其中,根据音频信号的时变特性,使用正弦或最优小波基础自适应地分析每个音频段。基础优化是通过一种新颖的开关滤波器组方案实现的,该方案在均匀滤波器组结构(离散余弦变换)和非均匀滤波器组结构(离散小波变换)之间切换。国际标准化组织/运动图片专家组(MPEG)音频编码标准(MPEG-1层1和2)的一个主要伪像,即预回波失真,它使用统一的滤波器组结构进行音频信号分析,在此过程中几乎被消除了。建议的编码器。在此音频编码器中采用了感知掩盖模型,该模型使用具有27个子带的高分辨率小波包过滤器库实现,该子带非常类似于人类听觉系统的关键频带。产生的方案是可变比特率音频编码器,它提供的压缩率几乎与MPEG-1层1和2相当,具有几乎透明的质量。

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