IMPORTANT: Doubt about graphic spectrum AUDACITY

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IMPORTANT: Doubt about graphic spectrum AUDACITY

Permanent link to this post Posted by m_i_k_e » Sun Jul 17, 2016 2:18 pm

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 .
Last edited by steve on Sun Jul 17, 2016 4:22 pm, edited 1 time in total.
Reason: remove broken img tag
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Re: IMPORTANT: Doubt about graphic spectrum AUDACITY

Permanent link to this post Posted by kozikowski » Sun Jul 17, 2016 4:00 pm

Please don't double post. A forum elf has to OK your post for it to appear.

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Re: IMPORTANT: Doubt about graphic spectrum AUDACITY

Permanent link to this post Posted by steve » Sun Jul 17, 2016 4:25 pm

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.
9/10 questions are answered in the FREQUENTLY ASKED QUESTIONS (FAQ)
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