DTFM signal generation and detection (2)
DTMF detector implementation
1 Dual audio frequency information acquisition algorithm: Goertzel algorithm
Introduction to Goertzel algorithm
2 Judgment method
Signal strength is greater than THR-SIG
Dual-tone signal (row, column) power difference: THR-TWIREV ~ THR-TWISTD
THR-ROWREL, THR-COLREL greater than the adjacent two-tone signal strength
Second harmonic intensity is less than THR-ROW2nd, THR-COL2nd
3 program flow
1 Dual audio frequency information acquisition algorithm: Goertzel algorithm
2 Judgment method
3 program flow
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