[time-nuts] Sound Card Spectrum Analyzer

[Bob Camp]

Hi

Great screen shots showing phase noise measurement and just what the "problem" is.

The top trace and the bottom trace show the same noise data. Different frequency ranges are shown, but it's the same noise. The scale on the Y scale on the traces shifts significantly between the two traces. That's because the Y scale is not calculated in terms of PSD (power spectral density). For noise that's a *very* useful thing.

Bob

On Feb 18, 2010, at 11:36 PM, Chris Caudle wrote:

>> The application is measuring phase noise.
> 
> Have you looked at Jack and Alsa Audio Analyzer?
> Take a look at the screen shot and see if it looks interesting:
> http://www.kokkinizita.net/linuxaudio/jaaa-pict.html
> 
> -- 
> Chris Caudle
> 
> 
> 
> 
> 
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