This system is controlled by a single-chip microcomputer and FPGA, and consists of a DTMF signal synthesis module and a DTMF signal recognition module. The synthesis of DTMF signals is based on direct digital frequency synthesis technology (DDFS). According to the key value pressed, a dual-frequency digital signal is synthesized inside the FPGA and output through a D/A converter. The recognition of DTMF signals is based on the Goertzel algorithm, which calculates the amplitude of 8 frequency points to determine the key value. After testing, this system can meet the requirements of DTMF signal synthesis and recognition.
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