双音多频（DTMF）的超级详细推导及实现文档+MATLAB源码，是学习数字信号处理的经典-Dual tone multi-frequency (DTMF) is derived in detail and implementation of super-documents+ MATLAB source code, is to learn the classic digital signal processing

The present project aims to develop a DTMF (Dual Tone Multi Frequency) Encoder-Decoder using loopback technical and graphical interface to be developed by Labview program. The signal processing and the application code will be using TMS320C6713i card