How to Interface MT8870 DTMF with 8051 microcontroller
Introduction DTMF (Dual Tone Multi-Frequency) is a signaling technique in telecommunications that uses a combination of two pure tone frequencies (sine waves) to generate dial tones in telephones. When a key is pressed, a pair of tones—one low and one high frequency—is sent. There are 8 unique frequencies: 4 in a lower range and 4 …
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