DTMF RECEIVER

摘要

The dual tone multi frequency (DTMF) tone signal receiver is for detecting a DTMF tone signal from an input audio signal by using a digital signal processor core. The receiver includes a PCM codec(10) for sampling DTMF signal, a serial to parallel converter(20) for converting serial PCM data into parallel data, a TSAC(30) for generating number of time slots, a memory(80) for storing assembly algorithm, a DSP core(70) for detecting DTMF signal from the PCM data by using Goertzl algorithm stored in the memory(80), an interrupt controller(40) for sending time slot data generated by the TSA(130) to the DSP core(70), and an I/O decoder(50) for interfacing the DSP core and peripheral equipments.