TAPI (1 4 )控件的特性如下：打外线电话,接听或拒绝内线电话,呼叫ID检测,DTMF音频,从电话记录或向电话回放WA(The features of the TAPI (14) control are as follows: making outside calls, answering or rejecting internal calls, calling ID detection, DTMF audio, playing back WA from phone records or

Goertzel算法是DTMF信号检测的核心,它利用二极点的IIR滤波器计算离散傅立叶变换值,快速有效的提取输入信号的频谱(Goertzel algorithm is the core of DTMF signal detection. It uses the two-pole IIR filter to calculate the discrete Fourier transform value, and extracts the spectrum of input signal quickl

生成语音信号，DTMF信号，每一位数字对应有个高频一个低频两者相加合成为一个语音信号(Generating Speech Signal, DTMF)

Arduino Library for Sandbox Electronics [SLD-000022] WT2000 MP3 Audio Shield with DTMF Support