Advantages of mt8870 decoder compared to other decoders
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$$$${{{{{{{{{{. The MT8870D/MT8870D-1 is a complete DTMF receiver integrating both the bandsplit filter and digital decoder functions. The filter section uses switched capacitor techniques for high and low group filters; the decoderuses digital counting techniques to detect and decode all 16 DTMF tone-pairs into a 4-bit code. }}}}}}}$$$$$$$$
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- DTMF (Dual Tone Multi-Frequency) signaling is used for telecommunication signaling over telephone line in the voice frequency band between communication devices (telephone, mobile).
- It is a set of eight audio frequencies transmitted/received in pairs to represent 16 different signals.
- The Telephone keypad is 4x4 or 4x3 matrix of push buttons in which rows represents lower frequency component and columns represents higher frequency component which is mapped as follows.
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