Signal detection and analysis of DTMF receiver with quick Fourier transform

The economical method for the signals detection of dual-tone multifrequency (DTMF) receiver is an important factor when developing cost-effective telecommunication equipment. Each channel of the digital switching system has independently a DTMF receiver, and it informs the detected signal to processors. The DTMF receiver uses DFT, FFT and Goertzel´s algorithm for signal detection. In this work, a new method for performance evaluation and analysis for multifrequency (DTMF) receiver using QFT (quick Fourier transform) algorithm is proposed. The symmetric properties of the QFT basic function method has better performance on the less memory consumption and real time processing ability compared with conventional FFT, DFT and Goertzel algorithm in the calculation of the number of floating-point operations. As shown in the experimental results, it also demonstrates that the QFT algorithm consumes less memory and process the task at the real-time.