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How can I transmit and recieve digital data from voice channel in GSM system?

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mahdithdn

mahdithdn

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hi,
How can i transmit and recieve digital data from voice channel in GSM system?
in other word I want to design a modem for voice channel in GSM system.

I have encoding and syntesis protocol for voice transmitnion and simulate in but i have never been able to transmit digital data with 3 Kbps and 10e-4 BER from it.

please help me.
thanks
 

Re: voice channel in GSM

Which encoding and synthesis protocols are used in such applications and how are they implemented?
 

voice channel in GSM

Enhanced Full Rate (EFR) speech transcoding. Refered to ETSI EN 300 726 v8.0.1
I can not undestand how it is work really.
I want a solution without caring about what is in this black box but i want to convert my digital data to quasi voice signal in transmetter and vice versa in reciever.
thanks
 

Re: voice channel in GSM

Hi

Use AT command to open the voice channel and connect your modem to the audio channel

Also using the AT command alow you to control other paramter regarding the voice channel like Audio gain or speaker volume

I do that on the Sony-Ericson cell modem and it work fine

remember to cerfully design the audio channel other wise GSM noise will degrade your audio quality

If you found my answer useful, click on the button that says Helped me. ( NO points will be taken from you! )


All the best

Bobi
 

    mahdithdn

    mahdithdn

    Points: 2
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Re: voice channel in GSM

Could someone explain how this modem can be designed in detail
 

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