Moteino sending Audio?

[JRoode35]

Hello All, I was wondering if it is possible to send and receive live audio data (two Moteino's acting like a wireless microphone system) I did a search and I couldn't find anything on the forum. I was wondering if anyone has tried this?

Thank You
Justin

[emjay]

Not and  stay within the usage rules of the lower ISM bands. Have a look at ESP8266 - you can stream away licence free at 2.1 GHz

[JRoode35]

I didn't think it was allowed the reason I asked is I still own a "900Mhz" cordless phone I always assumed it was around 915Mhz but I don't have a way to verify that, I do know it is part 15 compliant. I guess the only way to get around it would be to record the audio to an sd card and send the file in pieces over the time allowed for transmission.

Thank You for your response

[Felix]

I also wanted to build something like that and after a little research, like @emjay stated, live streaming is not really permitted on these radios to keep within the limitations.
If you can afford latency and perhaps greatly reduce the quality (phone quality?) and also use a spread spectrum to transmit on multiple channels, then it might be possible.

[perky]

I also wanted to build something like that and after a little research, like @emjay stated, live streaming is not really permitted on these radios to keep within the limitations.
If you can afford latency and perhaps greatly reduce the quality (phone quality?) and also use a spread spectrum to transmit on multiple channels, then it might be possible.

I agree, using frequency hopping is going to be necessary with 915MHz. You would need to add redundancy into your packets to cope with dropped packets, and you'd only be able to send low bandwidth audio like voice due to the transmit speed limitations. I don't think that would violate FCC regulations (unless it explictly doesn't allow audio, but I don't know of such a restriction). Certainly 868MHz is a no-go due to the duty cycle limit I think.

[Felix]

I think in such a scenario lossless audio is acceptable, assuming this is not HI-Q music streaming, bluetooth would be much better for that. Wifi even better with more range.