Frequently Asked Questions

QC Tonality

In the OVERALL tab, the QC Tonality screen will appear after the 1/1 octave screen if:

• The option is enabled (See Tools » About » Options)
• 1/1 Octave bands are computed
• Z-weighting is selected for OBA

1/1 Octave in OVERALL             QC Tonality                              Options Display

The QC Tonality algorithm proceeds as follows:

• Search high value frequency band in the range [31.5 16000] Hz
• If the level > average of adjacent bands, then add 5 dB
• For the end bands, if level > 5dB than next band, add 5 dB
• Apply A-weighting to spectrum [31.5 16000] Hz
• And display value as Corrected dBA

In the example displayed above there are two bands with a correction, 31.5 Hz and 500 Hz, which are both greyed out.

Note for the 31.5 Hz it only looks at the 63 Hz band and not at the 16 Hz since it is outside of the analysis band.