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frequency response - How to cancel this noise to find numbers of DTMF tones? - Signal Processing 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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16 Tone DTMF Generator Keypad 1234567890*#ABCD, 1750Hz tone burst, and CTCSS functionality:Amazon.com:Appstore for Android
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