TABLE III.
Glottal airflow measures obtained from the reference oral airflow volume velocity (OVV) and the accelerometer signal recorded by the smartphone (ACC) from subject N3 producing five sustained vowels at a comfortable pitch and loudness. Mean error averages the absolute percent error over the vowels.
| Measure | Vowel /a/ | Vowel /e/ | Vowel /i/ | Vowel /o/ | Vowel /u/ | Mean error | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| OVV | ACC | OVV | ACC | OVV | ACC | OVV | ACC | OVV | ACC | ||
| f0 (Hz) | 100.6 | 100.6 | 94.1 | 94.1 | 97.7 | 97.7 | 94.7 | 94.7 | 93.1 | 93.1 | 0.0 % |
| AC Flow (mL/s) | 609.9 | 637.6 | 736.2 | 796.5 | 631.6 | 640.7 | 626.0 | 621.6 | 691.2 | 698.8 | 3.2 % |
| MFDR (L/s2) | 644.7 | 607.9 | 804.6 | 720.6 | 511.1 | 485.9 | 533.8 | 526.0 | 638.5 | 617.8 | 5.2 % |
| SQ (%) | 178.8 | 184.2 | 155.5 | 149.8 | 123.5 | 127.9 | 167.0 | 148.4 | 135.6 | 141.5 | 5.2 % |
| OQ (%) | 55.0 | 58.7 | 61.4 | 65.5 | 58.6 | 61.0 | 57.2 | 55.9 | 55.9 | 55.7 | 4.0 % |
| H1–H2 (dB) | 3.8 | 3.9 | 7.1 | 8.2 | 4.7 | 4.4 | 7.3 | 6.8 | 4.9 | 4.1 | 9.0 % |
| HRF (dB) | −3.5 | −2.9 | −6.6 | −7.3 | −4.4 | −4.1 | −6.8 | −6.2 | −4.7 | −3.7 | 13.3 % |