利用号码双频表，利用傅里叶变换，实现由电话按键音，识别电话号码功能。需要自己录一段电话按键音。运行mainprocess自动输出识别号码。 (Dual-use table numbers, Fourier transform, achieved by touch-tone telephone, phone number identification function. It needs its own record a touch-tone phone. Mainprocess run automatically output identification number.)