Table 2.
Group means and standard deviations (in parenthesis) of acoustic variables and word intelligibility
| Speech Subsystem | Acoustic Variable | SMI Group average and SD |
NSMI Group average and SD |
TD Group average and SD |
|
|---|---|---|---|---|---|
| Articulatory Subsystem |
Vowel Space | Vowel space (Hz2) | 542914 (307412) | 907432 (193302) | 957023(159125) |
| Duration | Vowel duration (ms) | 250.6 (145.9) | 173.7 (28) | 176.8(32.5) | |
| “Pipe” (Hz/ms) | 6.9 (3.6) | 9.4 (0.9) | 9.9 (1.8) | ||
| F2 Slope | “Whip” (Hz/ms) | 7.1 (4.5) | 12.7 (2.3) | 11.4 (2.4) | |
| “Toys” (Hz/ms) | 7.5 (3.5) | 12.3 (5.2) | 10.1 (1.8) | ||
| F2 Transitional | “Pipe” | 152.3 (197.5) | 111.7 (25.4) | 128.9 (26.2) | |
| Duration | “Whip”(ms) | 143.5 (108.5) | 105.2 (20.8) | 107.7 (23.3) | |
| “Toys” (ms) | 209.7 (63.2) | 188.5 (49.2) | 199.8 (19.3) | ||
| F2 Transitional | “Pipe” (Hz) | 771 (399) | 1068 (261) | 1237 (239) | |
| Extent | “Whip” (Hz) | 884 (549) | 1335 (388) | 1197 (297) | |
| “Toys” (Hz) | 1285 (553) | 2048 (263) | 1962 (289) | ||
| Velopharyngeal Subsystem |
A1-P1 | “Big” dB) | 19.0 (4.9) | 22.2 (3.2) | 19.7 (2.9) |
| Laryngeal Subsystem |
F0 | “Top” (Hz) | 274.4 (53.9) | 249.5 (47.5) | 237.6 (24.8) |
| SNR | “Top” (dB) | 14.4 (3.2) | 13.0 (3.9) | 14.2 (1.9) | |
| Word Intelligibility (%) | 44.1 (27.4) | 80.3 (8.7) | 82.0 (9.6) | ||