Serial over Audio IN/Audio OUT support from audio jack.

[pankajrana]

With respect to the SABRE platform's Audio interface, "Serial over Audio IN/Audio OUT support" is possible through the Audio Jack?

Can this feature be implemented only through software or are any hardware changes required ?

[igorpadykov · Accepted solution]

Hi Pankaj

yes this may be performed using telephony modem algorithms.

Very simply put, for example using amplitude modulation:

Snd 1000KHz sinusoid  with amplitude "0" - means digital "0".

Send 1000KHz sinusoid  with max. amplitude "0xff" - means digital "1".

On receiving side one needs to decode it in software.

Other more complicated methods FM modulations (such as 2400Hz - "1",

1200Hz - "0") one can read in V22 and other telephony modem specs.

Best regards

chip

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[pankajrana]

hi,

Thanks for the reply.

If this Audio jack has only Audio Out support and not the Audio In , still Serial Tx - Rx communication is possible ?

[igorpadykov]

Surely. :smileyhappy:

"An expert will always state the obvious."

[Murphy's laws]