DSPLab for Delphi | |
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DTMF demo DTMF means Dual Tone Modulation Frequency. This systems is intended to transmit keys pressed on a keyboard through an audio channel such as a telephone line or a radio connection. For each pressed key two audio frequencies are emitted: one (higher) corresponds to the column in which the key is in, and the other (lower) corresponds to the row. This encoding handles a maximum of 4 rows and 4 columns, that means 16 keys (from 0 to 9, *, #, and from A to D). The DTMF demo shows how to decode the DTMF-frequencies
using TdspFFT component. download sources
(zip, ~6K)
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Copyright © 2006 Eugen Tarasov |