Acoustic characteristics of vowel sounds in patients with Parkinson disease

Abstract

The purpose of this study was to define the acoustic voice and speech characteristics of patients with Parkinson disease (PD). Seven female patients with PD and seven female healthy controls participated in this study. Each subject was instructed to vocalize extended corner vowels (

Towards the identification of Idiopathic Parkinson’s Disease from the speech. New articulatory kinetic biomarkers

“…The same study also reports cases of incomplete vocal folds closure along with folds bowing during phonation, leading to the presence of noise, that is typically characterized using measures such as Noise to Harmonics Ratio (NHR), Glottal to Noise Ratio (GNE), Harmonics to Noise Ratio (HNR) and Voice turbulence Index (VTI) among others [ 12 ]. On the other hand, there are works that have reported an increase of the average f0, jitter [ 13 ] and shimmer values [ 14 ], although the literature reports a certain controversy about their usefulness [ 15 ][ 16 ] to characterize the speech of PD patients. Cepstral Peak Prominence (CPP) also demonstrated to be a good quality measure to characterize PD populations [ 17 ][ 16 ].…”

Articulatory Changes in Vowel Production following STN DBS and Levodopa Intake in Parkinson’s Disease

“…Studies examining physiological changes in the speech systems of people with PD reported altered respiratory [ 3 ], laryngeal [ 4 ], and orofacial [ 5 , 6 ] functions. These motor manifestations have impacts on the acoustic signal of speech, such as reduced intensity level [ 7 ] and fundamental frequency ( f 0 ) range [ 8 ], altered phonation quality [ 9 ], and inaccurate and reduced articulation [ 10 – 12 ]. All these changes affect listeners' perceptions, such as perceived softer speech, reduced voice quality, and poor articulation.…”

A comparative study of the acoustic characteristics of the vowel /a/ between children with spastic and dyskinetic cerebral palsy

“…또한 강도파열 (loudness break), 음도파열(pitch break), 음성진전(voice tremor) 등이 불수의운동형에서 더 빈번하게 나타난다 (Nam, 2015). 경 직형은 기식성의 음질, 단음도, 단강도를 특징으로 하는 데 비 해, 불수의운동형은 부적절한 음성의 끊김과 이완을 특징적으 로 보인다 (Kent & Netsell, 1978 (Bang et al, 2013). 음성의 음향학적 분석은 사 운드 스펙트로그래프를 이용하여 음성의 음향학적 구조를 시 각적으로 판별하는 검사로서 (Ahn, 1995), 음성의 물리학적 특성 에 대한 객관적 정보를 제공해 준다 (Bhuta et al, 2004).…”

“…음성의 음향학적 분석은 사 운드 스펙트로그래프를 이용하여 음성의 음향학적 구조를 시 각적으로 판별하는 검사로서 (Ahn, 1995), 음성의 물리학적 특성 에 대한 객관적 정보를 제공해 준다 (Bhuta et al, 2004). 또한 비 침습적(non-invasive) 방법으로 음성장애를 수량화하여 객관적 으로 측정할 수 있으며 (Bang et al, 2013) Hz 사이의 비정상 배음 간 비율의 평균치이다 (Park et al, 2004). 호흡과 발성의 조절과 협응의 문제는 소음에 대한 낮은 배음의 음성 신호로 나타난다 (Fox & Boliek, 2012;Patel, 2003 (Peterson, & Barney, 1952;Yang, 1998), 후설음일수록 감소한다 (Seong, 2004…”