This encoding handles a maximum of 4 rows by 4 columns, that means 16 keys (from 0 to 9, *, #, and from A to D). Every time a key is pressed two audio frequencies are transmitted: one corresponds to the column in which the key is in, and the other one corresponds to the row. This systems is intended to transmit keys pressed on a keyboard through an audio channel such as a telephone line or a radio connection. But even on the air the DTMF encoding is widely used, for example, for the tone squelch.ĭTMF means Dual Tone Modulation Frequency. The DTMF encoding system has become very common in telephones where it has replaced the old pulse dialer. Click here below to download the datasheets of DTMF Decoder ICs.
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |