Abstract: The quality of voice is an important design request of embedded voice device, especially in MP3, MP4, PDA and mobile telephone. If there is noise it will influence their timbre. This paper analyzes the defects when using the hardware methods to eliminate noise, researches how to use software methods to reduce, prevent and eliminate noise, and gives the design of the software program. The essential functions that should be involved in noise cancellation driver are analyzed. The design is proved to be correct and effective by the successful result.

Key words: noise, thread, bias voltage

摘要： 在MP3、MP4、PDA、手机等智能音频设备中，音质是衡量其性能最重要的标准之一，但在播放或录音时的噪音会严重影响其音质效果。该文分析以硬件方法消除“POP”噪声的弊端，研究使用软件来降低、避免和消除噪声的方法，介绍软件的设计方案，结合Windows CE平台给出程序的实现。该设计方案经过大量项目的实践和改进，具有设计灵活、节省成本和应用效果良好等优点。

关键词: 噪声, 线程, 偏置电压

CLC Number: 

• TP368.2