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07/05/06 © Etymonic Design Incorporated, 41 Byron Ave., Dorchester, ON, Canada N0L 1G0 Page 9
USA 800-265-2093 519-268-3313 FAX 519-268-3256 www.audioscan.com
Figure 10: The highest SII is obtained when the entire speech envelope is above threshold
Long-Term Average 1/3 Octave Spectra (LTASS) for Speech Signals @ Average Effort
re overall SPL for entire passage; Hanning window; 128 ms average
-40.00
-35.00
-30.00
-25.00
-20.00
-15.00
-10.00
-5.00
0.00
200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000 6300 8000
BAND CENTER FREQUENCY (Hz)
BAND SPL (dB re overall SPL)
LTASS re overall SPL - STANDARD
LTASS re overall SPL - FEMALE
LTASS re overall SPL - CHILD
LTASS re overall SPL - ICRA
Figure 11: LTASS for Speechmap speech signals at average vocal effort