FPGA-based dual-tone multi-frequency signal generator

The present utility model relates to an FPGA-based dual-tone multi-frequency signal generator. The generator comprises an adding device and two signal processing modules, the adding device and the two signal processing modules are realized on one FPGA, each signal processing module is respectively composed of a frequency control register, a phase accumulator, an ROM for storing waveform data, and an output module, and output ends of the two output modules are all connected with the adding device. Digital logic of the FPGA-based dual-tone multi-frequency signal generator is only realized in one FPGA, the circuit board area is reduced, the board plate reliability is enhanced, and the failure rate is reduced. The generator is low in costs, high in integrated level, easy to debug, good in reliability and good in transplantability.