摘要： 介绍了一种针对低采样率音频信号的压缩方案。该方案通过混合滤波器组分解音频信号,并根据心理声学原理给不同的子带分配不同的比特数和量化阶距,最后还利用了哈夫曼编码技术对量化后数据进行编码。实验证明,这种基于Mp3框架的低采样率音频压缩方案能够对低至8kHz采样率的音频信号达到20kbps的压缩效果。
关键词:
低采样率,
Mp3,
子带编码,
音频压缩
Abstract: A scheme of low-frequency sampled audio compression is proposed here. Audio signal is divided into 8 subbands by hybrid filterbanks, and different numbers of bits and quantizers are allocated to different subbands based on result of psychoacoustic analysis. At last, samples after being quantized are coded with Huffman codes. By using Mp3 compress frame, this scheme can provide perceptually lossless compression of 20kbps with 8kHz sampled audio signal.
中图分类号:
付中华,王大炜,赵荣椿,谢磊. 一种基于Mp3框架的低采样率音频压缩方案[J]. , 2003, 29(19): 156-158.
FU Zhonghua, WANG Dawei, ZHAO Rongchun, XIE Lei. A Scheme of Low-frequency Sampled Audio Compression Based on Mp3 Frame[J]. , 2003, 29(19): 156-158.