This application report describes the implementation of a dual-tone multiple frequency (DTMF) tone generator and detector. The author provides some theoretical background on the algorithms used for tone generation and detection, and documents the a

HT9200A-B双音多频DTMF信号发生器，作者：QQ 64134703 ，欢迎咨询-HT9200A-B dual tone multi-frequency DTMF signal generator, the author: QQ 64134703, welcomed the Advisory

DTMF（双音多频）信号的产生和检测 1、程序分两部分，前半部分为DTMF 产生，后半部分为DTMF 检测。 2、DTMF 产生中用数组in设定键值，数组长度为16，范围0~15，可人工改写； 3、数组xr为产生的行频信号，长度为102，32位浮点型； 数组xc为产生的列频信号，长度为102，32位浮点型； 数组x为产生的双音频信号，长度102点，32位浮点型； 4、数组z为DTMF检测中能量模板 ，以完成按键的行位置及列位置检测； 6、变量outkeycol

DTMF tone signal generator by PIC16C5x assembly language. This program uses and external R2R ladder network to generate complete DTMF dial tones used for telphone dialing.-DTMF tone signal generator by PIC16C5x assembly language. This program uses a