Taidacent DTMF Decoder/Encoder Full Form Dial Tone Generator Dual Tone Multi-Frequency Audio Decoding Digital Display: Amazon.com: Industrial & Scientific
Table 2 from Dual Tone Multi Frequency (DTMF) signal generation and detection using MATLAB software | Semantic Scholar
DTMF Decoder / Encoder
LM 567 IC Touch-Tone Decoder – Simple Circuit Diagram