Re: LF: Microphone via WLAN (WiFi) ?

[wolf_dl4yhf <dl4yhf@freenet.de>]

Am 08.03.2014 21:11, schrieb Stefan Schäfer:
> Hello Mauro, Clemens, Graham,
>
> Your examples are in principle what i need but in these systems, the 
> dynamic range is much to low, maybe 40...50 dB. Some years ago i 
> played arround with some Bluetooth headset, which has a microphone 
> input of course. But the results were very poor.
> Also, the backgound noise reduction is an unwanted feature here, as 
> well as an AGC.
> I think, i the todays world, it should be "easy" to combine a SMD ADC 
> (those from the cheap soundcards) with a SMD WLAN IC (those from the 
> cheap USB WLAN adapters, giving some 10 mW to some 100 mW output 
> power). But i don't know anything about the communication between 
> these 2 ICs, protocols, configuration, etc. etc.
The problem is, you will need a microcontroller which runs an embedded 
TCP stack (because that's what a WLAN is for), and the interface is USB 
you will also need an USB host protocol stack, and for the soundcard 
side, you will.... guess the rest. It's not just an ADC, it's much more 
to this. You will quickly end up using something like an Raspberry Pi 
just as the "bridge" in between, and the power budget is exceeded by 
many 10 dBs...
Using one of those 'HiFi-headphones' with digital interface seems to be 
one of the few options to get it going quickly. Still you may be 
disappointed if you really need 100 dB of dynamic range.
73,
  Wolf .