Page 1 of 1

IMPORTANT: Doubt about graphic spectrum AUDACITY

Permanent link to this postPosted: Sun Jul 17, 2016 2:18 pm
Posted by m_i_k_e
Hello everyone, I have a question.
I did some acoustic measures for college work, and I want to use audacity to see the spectrum of these measures,

1) Open audacity
2) I have Imported to measurements made.
3) I selected a piece of the action.
4) I went to analyze -> analyze spectrum.
5) I obtained a graph.


https://www.dropbox.com/s/2hfws7g7dfwqb ... 1.JPG?dl=0

NOTE: The piece I selected, was the calibration tone (94 dB SPL at 1kHz).

So, my question is on the graph:
In the graph [img](Figure%201[/img]) on the left side, I get negative values, I want to know which are referenced (by Audacity) these values (eg referenced to 1 volt, millivolt, etc.).

I think this refenciado to 1V / Pa

Thank you .

Re: IMPORTANT: Doubt about graphic spectrum AUDACITY

Permanent link to this postPosted: Sun Jul 17, 2016 4:00 pm
Posted by kozikowski
Please don't double post. A forum elf has to OK your post for it to appear.

Koz

Re: IMPORTANT: Doubt about graphic spectrum AUDACITY

Permanent link to this postPosted: Sun Jul 17, 2016 4:25 pm
Posted by steve
m_i_k_e wrote:In the graph [img](Figure%201[/img]) on the left side, I get negative values, I want to know which are referenced (by Audacity) these values (eg referenced to 1 volt, millivolt, etc.).

The dB is referenced to 0 dB being "full scale".
The FFT data is normalized such that a 0 dBFS sine wave is displayed by Plot Spectrum as 0 dB.