MPEG Layer III音频解码器中图形均衡器的设计与DSP实现

Design and DSP Implementation of Graphic Equalizer for MPEG Layer III Audio Decoder

文章基于MPEGLayerIII码流的特点,在其解码过程中嵌入软件实现的10段图形均衡器。首先在PC机上仿真和定点化,然后在MPEGLayerIII的单片16位定点DSP程序中实现了该均衡器。实验结果表明文中设计的均衡器具有良好的音频品质。其算法简单易行,可同时应用于MP3解码软件和MP3播放器的均衡器设计。

In this paper,a10-band graphic equalizer is designed and embedded in the MPEG Layer III bit streams.Both float-point and fixed-point algorithm simulations are made under PC platform.The equalizer is also implemented within the MP3decoder firmware of a single-chip16bit fixed-point DSP.Experiments show that the designed equalizer provides perfect audio quality.The proposed algorithm is easy and can be utilized in the equalizer design of both soft-ware MP3decoder and MP3player.