LOW COST DATA TRANSMISSION WITH DTMF FOR MOBILE RADIOS
Original Publication Date: 1995-Mar-01
Included in the Prior Art Database: 2002-Mar-25
To transmit short numeric or alphanumeric mes- coupling to the standard microphone. sages use a standard DTMF terminal (e.g. German PTT, price less 300.-DM) with the possibility to con- The DTMF message will be displayed on any nect direct to the microphone-port or by acoustic radio with a DTMF decoder display.