A new single tone detection algorithm

In the paper, the multi-correlation algorithm and the quadrate-carrier structure (MCA-QCS) are proposed to detect the single tone. The detection output with band-active response is achieved. The bandwidth and the carrier frequency of the band-active function can be easily set in the MCA-QCS. The computation requirement is dramatic low and the frequency response is superior to the other algorithm, such as Goertzel algorithm, single-correlation algorithm, IIR filter, and FIR filter. Average two multiplies and two adders are needed for each sample only. The experiment result of DTMF detection for telephone line is analyzed. Those results confirm that the performance on computation and frequency response for the new algorithm is superior to Goertzel algorithm.