Re: Controlling and reading a usb radio

[Peter S. <pe...@st...>]

Deron wrote:
> Indeed, it shows:
> 
>   1 [Radio          ]: USB-Audio - ALERT FM Radio
>                        Axentia Technologies AB ALERT FM Radio at 
> usb-0000:00:1a.1-1, full speed
> 
> I realize this may be beyond the knowledge of this list, but I'll
> explain anyway. I'm just looking for the pcm audio stream (be it 
> 16bit, 2 channel or whatever) so that my code can look for the   
> audio tones that precede the EAS (the Emergency Alert System used
> in Canada and the US to broadcast severe weather warnings and other
> emergency notifications) and act accordingly. So opening a
> device/pipe is perfectly acceptable.
..
> I'm guessing I need to look into ALSA?

Yes. You will find a large number of programs which work with audio
input on Linux systems.

A simple capture example is:
http://equalarea.com/paul/alsa-audio.html#captureex

Depending on what analysis you need to perform to match the emergency
audio signature there may also exist many helpful tools and libraries
already. Since it's radio I expect you'll want to have a bit of fuzz.


//Peter