Re: [Discuss-gnuradio] Re: FUNCube dongle

[Moeller]

On 24.02.2011 15:46, Patrick Strasser wrote:
> Just like every USB sound interface it does not matter where the signal
> comes, where it is going and how things behind the interface work. It
> makes no difference to your application if you connect a converter via
> cable to your sound interface in your computer or if you have the sound
> interface built into your converter.

But I think it's a big difference in signal quality.
There's no IQ imbalance due to L/R audio channel differences,
no disturbed analog audio frequency response between dongle and PC.
And I suppose in audio you have a spectral gap in the audio bass/LF region,
a gap near the baseband center frequency. This is far more than just a single
FFT bin (DC offset) in direct conversion receivers.

> If it implements the USB Audio Class, its a USB Audio device. A headset
> works the same. That's the nice thing about abstract interfaces.

Yes, I think it's a nice abstract interface.
Do you know the theoretical limits for the sample rate?
Can it fill the full USB bandwidth or does it only accept
"standard audio" sample rates?

Moeller