用VB编写的程序，演示出AM调制前后和解调后的波形之间的关系-using VB program, the demo out before and after the AM modulation and demodulation of the relationship between waveforms

邮件提交程序，VB 6.0 设计，可自动识别邮件地址及内容，数据库在Excel 表格中-EMAIL SUBMIT SYSTEM Designed by VB6.0 Database in Excel Form