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1200 baud data transfer over audio passband of cellphone. Is that possible?

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sv3ora:

--- Quote from: jhpadjustable on November 14, 2019, 08:48:12 pm ---Holding the channel open with DTMF! Fine business! :clap:

Have you verified with a proper demodulator yet? What sort of bit error rates are you getting?

--- End quote ---

No, read the last paragraph at the page. The tone seems ok to my ear (not distorted) compared to the original, but hey not tested yet. To do this I will have to built the actual modems. But first I want to see if it is valid in other countries. Can you do this simple test for me?

amyk:
You can get software that will act as a modem to decode those files. In fact, that's how these work: https://en.wikipedia.org/wiki/Softmodem

Tony_G:
Saw this thread come up and I wondered if anyone has done TCP over SMS and the first thing to pop up is a software patent

https://patents.google.com/patent/US8099115B2/en

What would the world do without them....

TonyG

sv3ora:

--- Quote from: Tony_G on November 15, 2019, 01:14:43 am ---Saw this thread come up and I wondered if anyone has done TCP over SMS and the first thing to pop up is a software patent

https://patents.google.com/patent/US8099115B2/en

What would the world do without them....

TonyG

--- End quote ---

I remember I have seen a girl presenting it but I did not find it very useful as sms costs 30 cents per sms where I live and these are short bursts of data.

sv3ora:

--- Quote from: amyk on November 15, 2019, 01:00:29 am ---You can get software that will act as a modem to decode those files. In fact, that's how these work: https://en.wikipedia.org/wiki/Softmodem

--- End quote ---

Yes I've already used the MixW in packet mode. In fact this is how I generated the audio files. The problem is that I need to build another audio cable to connect the other set of PC/mobile, which I haven't done yet, but eventually I will do.

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