An improvement of MIPS rate in detection of DTMF signals of 64 subscribers using GOERTZEL´s algorithm

Detecting DTMF signals through efficient methods is important to develop telecommunication equipments. In this study, we propose detection of DTMF signals for 64 subscribers by XC56309PV100 (MOTOROLA) simultaneously. Generally, DTMF signals are created on switch-board of telephone with the combination of two frequency groups. There are various methods for detecting DTMF signals such as using GOERTZEL algorithm which is used for Discrete Fourier Transform (DFT). According to this research, different ports of ESSI, HOST interface and also suitable modes have been used to detect the tones. In conclusion, we achieved appropriate improvement by using techniques to find out the MIPS rate which is equal to 3.