这是电信语音聊天设备的源码，包括DTMF收号、语音提示、帐号管理等功能，开发环境为万利仿真开发环境。-This is the voice chat telecommunications equipment source, including the resumption DTMF, voice instructions, account management and other functions, the development environment for the benefit 10,0

模拟双音多频(DTMF)拨号系统的MATLAB仿真,形象画出了每个数字键所代表产生的波形