中文摘要：

为了提高MP3播放器的播放质量，增强音响效果，对播放器的音频滤波电路进行了优化设计。提出了利用电磁兼容理论中的滤波技术，设计了MP3播放器的有源音频滤波电路，并对滤波电路的性能进行了分析，实现了滤波电路设计的优化。理论分析和实验结果表明：该MP3播放器有源音频滤波电路，既能提升高音效果，又能抑制高频噪声，实现了MP3播放器整体性能的提高。在不增加滤波器复杂程度和成本的基础上，实现了滤波电路设计的优化，改善了滤波性能。因此，该有源滤波电路可广泛应用于MP3播放器及高速数模转换芯片和D类放大器等音频设备。

英文摘要：

In order to improve the playback quality of MP3 player and enhance acoustics,it is necessary to optimize the audio filter circuit of players. The filtering techniques in theory of electromagnetic compatibility were used to design the audio filter circuit of MP3 player, the capability of filter circuit was analyed, and it was achieved to optimize design filtering circuit. The theoretical analysis and experimental results show that the MP3 player active audio filter circuit can both enhance treble effect, or suppress high-frequency noise, and has achieved improving the MP3 player＇s overall performance. Therefore, the active filter circuit can be widely used in MP3 player, and high-speed digital-analog conversion chips and class D amplifiers and other audio equipment.