phone line using tones only

[glebka11]

Hey
I want to build this project, that will allow me to connect a microphone to the speaker of the regular telephone and speaker to the mic of the telephone, and then connect the other end to a regular modem.

Basicly:

TELEPHONE -> Speaker | > mic --------|-----some circuit----MODEM
****************Mic | > speaker---|

I understand that there might be a lot of vocal breaks due to autside factors, but i will put some noise protectors.

I really need this to be build, so please, any idea will be appreciated!

 

[Nigel Goodwin]

Hey
I want to build this project, that will allow me to connect a microphone to the speaker of the regular telephone and speaker to the mic of the telephone, and then connect the other end to a regular modem.

Basicly:

TELEPHONE -> Speaker | > mic --------|-----some circuit----MODEM
****************Mic | > speaker---|

I understand that there might be a lot of vocal breaks due to autside factors, but i will put some noise protectors.

I really need this to be build, so please, any idea will be appreciated!

Acoustic modems were extremely common in the past, however the BIG problem is their reliability - they only work well at very low speeds. I've not seen any since the 300 and 1200 baud days - I presume you are wanting modern speeds?.

 

[glebka11]

As the matter of fact, i don't care about the speed, as the connection will be used for temprorary SSH and telnet sessions (only some text will be transfered).

This is veryimportant for me.

 

[Nigel Goodwin]

As the matter of fact, i don't care about the speed, as the connection will be used for temprorary SSH and telnet sessions (only some text will be transfered).

This is veryimportant for me.

I had an acoustic modem at home somewhere, from a Commodore 64, I'll see if I can find it - it might have been thrown away by now though.

 

[glebka11]

Thanks!

If you won't have any luck finding it, a circuit or ideas would be great.

 

[glebka11]

no reply?

 

[Nigel Goodwin]

I've just checked, no sign of it, it must have gone in the bin!. Why do you want to do this?, it's not been done for a great many years (1970's?) - and it didn't work very well then!.

 

[glebka11]

Basicly, i need it to be able to get SSH/Telnet controll over my PC on public phones temprorary (assuming i have a laptop).

Do you or anyone else know how to build something like this?

If a driver is a problem, i am not learning Driver Development in c++ for nothing!