正弦波形生成器，直接写到文件，可以用goldwave等软件进行播放。只要修改c文件里的宏，可以生成任意频率的正弦波。silentecho作品。-sine-generator, the paper wrote directly, you can use software such as goldwave player. As long as amended c documents in the macros, can generate the sine wave frequency. Silent