On Mon, Dec 14, 2015 at 09:09:16AM -0800, Len Ovens wrote: > The "dedicated ADC" says a lot as the average Audio ADC that runs at > even 192k or higher still has analog ciruitry BW limited to around > 20K. I would imagine for this use, 12 bits at 96000hz with analog > circuitry that is bandwidthed from around 10k to 50k might work > better than an "Audio card". Depends on how it works. Just like DA converters can be upsampling, an AD converter could actually sample at a much higher rate than the nominal one and then downsample digitally - for the same reason as the DA: it allows to use a simpler analog antialising filter. With such an architecture, switching to 96 kHz would provide the full, near FS/2, bandwidth even if that isn't very useful for audio. > I am not sure how much the bit depth > affects this process but do know that the noise floor of an off air > signal is not anywhere near 96db below any peak signal. No, but you can have a very low level signal which you want to demodulate very near (in frequency) to a high level unwanted signal. In other words, you need high dynamic range *before* the demodulator, even if the demodulated signal can have a low S/N ratio. High linear dynamic range is one of the things you pay for with the more expensive receivers. Ciao, -- FA A world of exhaustive, reliable metadata would be an utopia. It's also a pipe-dream, founded on self-delusion, nerd hubris and hysterically inflated market opportunities. (Cory Doctorow) _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
