Hello all.
I am looking to stream audio over cellular. It is a mono channel and will not be compressed. Bandwidth of signal is ~12kHz. Can someone tell me if it is possible to do this with the BRN404X? It looks like I could but I am not sure if Particle restricts the amount of incoming data. My follow up question is ....Is for proof of concept does anyone have a good site I could push the data to post Particle reception to test the audio out?
Thank you
Hi, what are you planning to do with the audio?
If you really mean 12 kHz maximum frequency, the sample rate would need to be 24000 samples per second. Samples must be at least 8 bit, and preferably 16 bit. This is far beyond the data rate of the Particle LTE Cat M1 cellular devices, irrespective of the cost, which would be prohibitive.
@rickkas7 ...thank you for your reply.
Technical:
could you explain more to this please? Fs = 24kHz at 16 bits = 384kbps and CAT-M1 can stream 1Mbps. Would a 5khz max frequency work? Is this a overhead data issue? If so can you give me a rough number of overhead?
Cost:
Is the 100K/month block for free trial posted on Particle pricing considered 100kbits?
The problem is not the bandwidth of LTE Cat M1, but the amount of data that be processed by the modem and overhead of the rest of the system. It's designed for less than a few kilobytes per second maximum.
The 100K data operations is the number of publish, subscribe, function, or variables requests, per device, per month. A publish is limited to 1024 bytes of UTF-8 text, and at most once per second. This would not be sufficient for any streaming audio use case.
Hi,
in case you needed to process the audio, and could do so on board, you could check:
Or if your use case allows, you could use a Photon 2 as well:
Docs:
Best,
This topic was automatically closed 182 days after the last reply. New replies are no longer allowed.