DTMF signal encoder and decoder design and simulation ABSTRACT
DTMF (dual tone multiple frequency) encoding is to use the synthesis of two single-tone sounds to indicate a number or symbol. DTMF decoding is to use a particular method or algorithm to recognize the synthesis of two single-tone sound, and extract information which contained within the numbers, or symbols. DTMF signal encoding and decoding has become a very mature technology, that follows the technical specification ITU Q.23. Relative to the pulse dialing, DTMF dialing method has the advantage of high rate, and applies during a call without introducing significant interference. DTMF tone encoding techniques include the occurrence and synthesis of two-tone ; DTMF decoding techniques include dual-tone detection, tone transceiver separation of synchronization and identification .Understanding and solving these technical problems has universal significance for designing in general communications equipment and systems. On the analyzing result of some of the existing DTMF signal encoding, we has advanced a new DTMF signal encoding and decoding algorithm respectively in the paper. The result of simulation analysis on Ti TMS320C64XX DSP shows that the new DTMF signal encoding and decoding algorithm are simple and easy to realize, possess high coding efficiency, high rate to run,and decoding error rate very low , have practical application value.
Keywords: DTMF Signal Encoding DTMF Signal Decoding TMS320C64XX DSP Application
