TITLE:
Cepstral and linear prediction techniques for improving intelligibility and audibility of impaired speech
AUTHORS:
G. Ravindran, S. Shenbagadevi, V. Salai Selvam
KEYWORDS:
Impaired Speech; Speech Disability; Cepstrum; LPC; Vocal Tract
JOURNAL NAME:
Journal of Biomedical Science and Engineering,
Vol.3 No.1,
January
12,
2010
ABSTRACT: Human speech becomes impaired i.e., unintelligible due to a variety of reasons that can be either neurological or anatomical. The objective of the research was to improve the intelligibility and audibility of the impaired speech that resulted from a disabled human speech mechanism with impairment in the acoustic system-the supra-laryngeal vocal tract. For this purpose three methods are presented in this paper. Method 1 was to develop an inverse model of the speech degradation using the Cepstral technique. Method 2 was to replace the degraded vocal tract response by a normal vocal tract response using the Cepstral technique. Method 3 was to replace the degraded vocal tract response by a normal vocal tract response using the Linear Prediction technique.