frequency response - How to cancel this noise to find numbers of DTMF tones? - Signal Processing Stack Exchange
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frequency - Why do push button telephones use dual-tone for signalling? - Electrical Engineering Stack Exchange
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GitHub - MeowLucian/DTMF_Detector: Using Matlab to simulate Dual-Tone Multi- Frequency (DTMF) of telephone
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Figure 1 from 60-channel dual tone multi-frequency signaling receiver based on Goertzel algorithm on single 100MIPS TMS320C54 DSP platform | Semantic Scholar
Dual Tone Multi-Frequency signal generation and testing - YouTube
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