DTMF DETECTOR USING DSP CHIP

摘要

1. The technical field to which the invention described in the claims belongs:;DTMF detector;2. Technical challenges to be solved by the invention:;Provides DTMF detector for real time processing of multi-channel DTMF signal using single DSP chip and its implementation method;3. Summary of Solution to Invention;The DTMF detector of the present invention is implemented in a DSP chip, and comprises a PCM extension means for converting PCM data into linear data, and a plurality of correlators, and each of the linear data and a plurality of preset reference signals and their correlations. Correlator means for detecting a plurality of power values for the frequency band of the DTMF signal, total power detection means for detecting the total power value of the linear data, and output powers of the low frequency correlator among the correlators of the correlator means. A low frequency peak power detection means for detecting a low frequency peak power value as an input, a high frequency peak power detection means for detecting a high frequency peak power value by inputting output powers of a high frequency band correlator among correlators of the correlator means, and the total power value Determining whether the input data is the DTMF signal by comparing the low frequency peak power value and the high frequency peak power value Configure by means.;4. Important uses of the invention;Numeric data detection of paging system