14.3 TONALITY MEASUREMENTS
The instrument performs Tonality measurements together with SLM
measurements.
To start measurements, press the <Start> key.
If you use the ISO 226-2003 or ISO 226-1987 standards, each press of the
<Start> key will start series of measurements defined by the Cycles parameter,
which the user can set. The tonality results for the last cycle will be saved in the
file. These results can be viewed as the 1/3 octave spectrum graph.
If you use the ISO 20065-16 standard, you cannot change the number of Cycles,
but you can set the Number of Meas. parameter, which limits the number of
measurements. In the Auto mode, the instrument will perform just these number
of measurements and will stop. In the Manual mode, you should press <Start>
to start new measurement.
After reaching the Number of Meas., the instrument performs postprocessing
calculations which is accompanied by a message “Calculations…”.
Results of the Tonality analysis are presented as a spectrum – FFT in case of the ISO 20065-16 standard or 1/3
octave in case of the ISO 226-2003 and ISO 226-1987 standards.
In case of the ISO 20065-16 standard, you can view tonality results in a table
form: Tonality Results.
The Tonality Results view presents:
1) results of Tonality analysis for the currently displayed measurement:
• Tones(x) - a list of tones causing penalty, x – number of tones,
- Tones’ frequencies and the corresponding audibilities in dB (ΔL)
• Critical Band (y) - frequency band with a bandwidth of a decisive tone, y
– number of this tone in the list of all detected tones, XX Hz – YY Hz -
Critical Band frequency boundaries and calculated for this critical band
results:
- Lt – tone level
- Lg – critical band level of noise that is assigned to the critical band
- ΔL – audibility, difference between the tone level and the masking
threshold
2) averaged results for the series of measurements:
• mean L – averaged Audibility result of all measurements
• U90% – extended uncertainty of the mean audibility with a coverage
probability of 90% in a bilateral confidence interval
• Kt – spectrum adjustment
The full Results Table is available to see in the SavnPC++ program. It allows you
to view all the measured parameters according to ISO 20065:2016.
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