Re: [LAU] Open Sound Interface project beginnings

Previous message: [thread] [date] [author]
Next message: [thread] [date] [author]

From: Fons Adriaensen <fons@...>

To: <linux-audio-user@...>

Subject: Re: [LAU] Open Sound Interface project beginnings

Date: Wednesday, October 26, 2011 - 4:01 pm

On Wed, Oct 26, 2011 at 08:52:14AM -0500, Charles Henry wrote:

> > http://sdr-widget.googlecode.com/files/Draft4_Sound_card_noise_floor_com...

quoted text

>
> 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@lists.linuxaudio.org
http://lists.linuxaudio.org/listinfo/linux-audio-user

Previous message: [thread] [date] [author]
Next message: [thread] [date] [author]

Messages in current thread:

[LAU] Open Sound Interface project beginnings, Charles Henry, (Thu Oct 20, 7:54 pm)

Re: [LAU] Open Sound Interface project beginnings, Emanuel Rumpf, (Sun Oct 30, 1:56 pm)

Re: [LAU] Open Sound Interface project beginnings, Charles Henry, (Wed Nov 2, 1:48 am)

Re: [LAU] Open Sound Interface project beginnings, Emanuel Rumpf, (Fri Nov 4, 9:32 pm)

Re: [LAU] Open Sound Interface project beginnings, Lorenzo Sutton, (Wed Oct 26, 8:15 am)

Re: [LAU] Open Sound Interface project beginnings, Renato, (Tue Oct 25, 7:42 pm)

Re: [LAU] Open Sound Interface project beginnings, Charles Henry, (Tue Oct 25, 7:59 pm)

Re: [LAU] Open Sound Interface project beginnings, Renato, (Tue Oct 25, 8:25 pm)

Re: [LAU] Open Sound Interface project beginnings, alexander, (Tue Oct 25, 6:21 pm)

Re: [LAU] Open Sound Interface project beginnings, pod, (Tue Oct 25, 9:52 pm)

Re: [LAU] Open Sound Interface project beginnings, Charles Henry, (Wed Oct 26, 1:52 pm)

Re: [LAU] Open Sound Interface project beginnings, Fons Adriaensen, (Wed Oct 26, 4:01 pm)

Re: [LAU] Open Sound Interface project beginnings, Charles Henry, (Tue Oct 25, 7:13 pm)

Re: [LAU] Open Sound Interface project beginnings, Egor Sanin, (Fri Oct 21, 2:47 pm)

Re: [LAU] Open Sound Interface project beginnings, Charles Henry, (Fri Oct 21, 3:25 pm)

Re: [LAU] Open Sound Interface project beginnings, Alexandre Prokoudine, (Tue Oct 25, 6:46 pm)

Re: [LAU] Open Sound Interface project beginnings, Michelle Konzack, (Wed Oct 26, 6:00 pm)

Re: [LAU] Open Sound Interface project beginnings, Egor Sanin, (Tue Oct 25, 7:14 pm)

Re: [LAU] Open Sound Interface project beginnings, Alexandre Prokoudine, (Tue Oct 25, 7:23 pm)

Re: [LAU] Open Sound Interface project beginnings, Egor Sanin, (Tue Oct 25, 8:00 pm)

Re: [LAU] Open Sound Interface project beginnings, Charles Henry, (Tue Oct 25, 7:21 pm)

Re: [LAU] Open Sound Interface project beginnings, Michelle Konzack, (Wed Oct 26, 6:04 pm)

Re: [LAU] Open Sound Interface project beginnings, Charles Henry, (Wed Oct 26, 6:30 pm)