Audioscan Axiom - Manual (Page 51)

Axiom ® User's Guide Version 1.8  May 2015
Spectral analysis in Multicurve
Selecting a stimulus level of 0 dB (off) in [Multicurve] presents a spectral analysis of the coupler microphone
signal (Scale = dB SPL) or the difference between the coupler and reference microphone spectra (Scale = dB
Gain).
If the stimulus type is [Pink noise], the analysis is performed in 1/12th octave bands and displayed in real time.
Pressing <Continue> captures the displayed spectrum.
If the stimulus type is [Swept], a swept filter analysis is performed in 1/12th octave bands and displayed at 1/3rd
octave frequencies. Pressing <Continue> causes the swept filter analysis to be performed in 1/12th octave bands
and displayed at 1/12th octave frequencies.
Manual control procedure
Manual control displays the reference microphone SPL, the coupler microphone SPL, their difference in dB
(gain) and coupler microphone signal distortion at any selected 1/12th octave frequency and at a selected input
level from 40 to 90 dB (in 5 dB steps) and at 0 dB (off).
1. Click on and select [Manual control] in the [Test box] menu.
2. Click on the [Level] button and select the desired stimulus level from the drop-down list.
3. Click on the [Frequency] button and select the desired frequency from the drop-down list. (Distortion
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