Application of automatic speech recognition to quantitative assessment of tracheoesophageal speech with different signal quality.
OBJECTIVE
Tracheoesophageal voice is state-of-the-art in voice rehabilitation after laryngectomy. Intelligibility on a telephone is an important evaluation criterion as it is a crucial part of social life. An objective measure of intelligibility when talking on a telephone is desirable in the field of postlaryngectomy speech therapy and its evaluation.


METHODS
Based upon successful earlier studies with broadband speech, an automatic speech recognition (ASR) system was applied to 41 recordings of postlaryngectomy patients. Recordings were available in different signal qualities; quality was the crucial criterion for this study.


RESULTS
Compared to the intelligibility rating of 5 human experts, the ASR system had a correlation coefficient of r = -0.87 and Krippendorff's alpha of 0.65 when broadband speech was processed. The rater group alone achieved alpha = 0.66. With the test recordings in telephone quality, the system reached r = -0.79 and alpha = 0.67.


CONCLUSIONS
For medical purposes, a comprehensive diagnostic approach to (substitute) voice has to cover both subjective and objective tests. An automatic recognition system such as the one proposed in this study can be used for objective intelligibility rating with results comparable to those of human experts. This holds for broadband speech as well as for automatic evaluation via telephone.
Haderlein
Tino
T
Department of Phoniatrics and Pedaudiology, University of Erlangen-Nuremberg, Erlangen, Germany. Tino.Haderlein@informatik.uni-erlangen.de
Riedhammer
Korbinian
K
Nöth
Elmar
E
Toy
Hikmet
H
Schuster
Maria
M
Eysholdt
Ulrich
U
Hornegger
Joachim
J
Rosanowski
Frank
F
D000368:Aged; D001330:Electronic Data Processing / Q000379:methods; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D015203:Reproducibility of Results; D013065:Speech Intelligibility; D013068:Speech Production Measurement / Q000379:methods*; D049250:Speech Recognition Software; D013071:Speech, Alaryngeal; D013689:Telephone