摘要
近年来,感知音频编码已成为音频数据压缩中的一项重要技术并在不同类型的多媒体中广泛应用。MPEG-2/4中新加入的时域噪声整形(TNS)技术通过使用线性预测编码来减少频率场中的量化噪声对主观声音质量评价的影响。本文的主要内容包括了MPEG-4 AAC系统的基本结构,时域噪声整形(TNS)原理,线性预测(LPC)在时域噪声整形(TNS)中的应用及TNS模块的软件实现这四个部分。
Perceptual audio coding has become an important technology for different types of multimedia service these years. Temporal Noise Shaping( TNS) technique represents a rather novel concept in perceptual audio coding has been used in MPEG-2/4 to reduce quantized noise in frequency field. In this paper,the basic structure of MPEG-4 AAC system,the principle of TNS module,the application of LPC in TNS and software implementation these four parts of content will be introduced.
引文
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