On Wed, Oct 26, 2011 at 08:52:14AM -0500, Charles Henry wrote: > > http://sdr-widget.googlecode.com/files/Draft4_Sound_card_noise_floor_compare_2010_07_25_TF3LJ.pdf > > This looks good to study--that analog board has great noise characteristics. Yes. To get the full story you should also zoom in on the 0-500Hz range. Noise density will rise in that range, and there will be mains frequency harmonics leaking in. Provided the noise density is flat in the audio range, the unweighted S/N for 20 kHz bandwidth would be -(No + 43) dB, i.e. 114.8 dB for the SDR Widget Lite Alpha2, which is quite good. For an A-weighted value add 2.2 dB. The best way to measure the actual noise level would be jnoisemeter. Ciao, -- FA _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
