Siemens S35 to the sound map as “GSM gateway” - echo?

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Hello!
I hope that perhaps someone can help me here with a little notion of audio engineering .
I intend to attach, an old S35-Handy with a tinkered adapter to the sound map of an old computer, in order to then obtain over it discussions in the GSM net.

It folds already completely well so far, however I fight for the moment with a problem and do not know no more, how I am to get ahead thereby.

The caller on the Internet side hears his own voice in the quiet echo. From where does this echo come and as gets I it away?

I had before also still another problem with a feedback, could which be eliminated however, when I had a little better from each other isolated the wires. Could the echo have a similar cause? Can the clay/tone “jump over” from a wire in the others or a short-circuit the clay/tone, which comes from the loudspeaker connection directly again into the microphone connection feeds?

Did someone tinker already times successfully such a cable?

Sebastian

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Hello,

Quotation:

Quotation of SebastianBonn Can “jump over” the clay/tone from a wire in the others

Yes. The phenomenon is called “cross modulation”. That does not have to be however necessarily your problem. During so short lines and the quite small achievements it is even rather improbable.

Quotation:

Quotation of SebastianBonn from the loudspeaker connection comes directly again into the microphone connection feed?

That does not have to take place necessarily on electronic level. That simply the acoustic waves from the loudspeaker again in the micro is the most frequent cause for echo comes. Often happens with Headsets, because micro and loudspeakers are spatially close there together and in the same housing are. In addition, with a normal loudspeaker and a micro at the PC that will happen.

The probably only possibility, which you have, is it, to reduce the volume of the expenditure so far that the echo on the opposite side no more than is not felt disturbing.

Many greetings

Franc