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Data using DTMF over GSM voice systems

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mitesh

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data transmission over gsm voice channel

I want circuit schematic and source code for sending data over GSM voice and on any wireless voice gadgets
 

sending data over gsm voice

Best bet is to hook a 2400/9600 bps type of modem chip to the PCM anlog I/O
 

data over voice channel

hi ..

from concept of gsm the gsm voice channel is designed to carry voice. The codec is optimized for human voice. The transfer characteristic is very poor for data transmission. Even 1k2 is almost impossible to modulate to voice channel with reasonable ber. If you want small amount you can use dtmf sequences with suitable hardware. Be carefull of voice characteristic of each phone. Each phone has an different charakteristric of equalization.

later

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