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acoustic analysis

Dhanya Thomas, Mala S Bagiya, Poikayil Sukumaran Sunil, Lucie Rolland, Anakuzhikkal Sudarsanan Sunil, T Dylan Mikesell, Srinivas Nayak, Subrahmanyam Mangalampalli, Durbha Sai Ramesh
GPS-derived Total Electron Content (TEC) is an integrated quantity; hence it is difficult to relate the detection of ionospheric perturbations in TEC to a precise altitude. As TEC is weighted by the maximum ionospheric density, the corresponding altitude (hmF2) is, generally, assumed as the perturbation detection altitude. To investigate the validity of this assumption in detail, we conduct an accurate analysis of the GPS-TEC measured early ionospheric signatures related to the vertical surface displacement of the Mw 7...
August 14, 2018: Scientific Reports
Alfredo Illanes, Axel Boese, Iván Maldonado, Ali Pashazadeh, Anna Schaufler, Nassir Navab, Michael Friebe
We propose a new and complementary approach to image guidance for monitoring medical interventional devices (MID) with human tissue interaction and surgery augmentation by acquiring acoustic emission data from the proximal end of the MID outside the patient to extract dynamical characteristics of the interaction between the distal tip and the tissue touched or penetrated by the MID. We conducted phantom based experiments (n = 955) to show dynamic tool/tissue interaction during tissue needle passage (a) and vessel perforation caused by guide wire artery perforation (b)...
August 13, 2018: Scientific Reports
Caleb Vununu, Kwang-Seok Moon, Suk-Hwan Lee, Ki-Ryong Kwon
Machine fault diagnosis (MFD) has gained an important enthusiasm since the unfolding of the pattern recognition techniques in the last three decades. It refers to all of the studies that aim to automatically detect the faults on the machines using various kinds of signals that they can generate. The present work proposes a MFD system for the drilling machines that is based on the sounds they produce. The first key contribution of this paper is to present a system specifically designed for the drills, by attempting not only to detect the faulty drills but also to detect whether the sounds were generated during the active or the idling stage of the whole machinery system, in order to provide a complete remote control...
August 11, 2018: Sensors
Jing Liu, Chunyu Ai, Bowen Zhang, Yun Wang, Lara M Brewer, Chien-Kun Ting, Desheng Huang, Lu Yu
Apnea should be monitored continuously in the post anesthesia care unit (PACU) to avoid serious complications. It has been confirmed that tracheal sounds can be used to detect apnea during sedation in healthy subjects, but the performance of this acoustic method has not been evaluated in patients with frequent apnea events in the PACU. Tracheal sounds were acquired from the patients in the PACU using a microphone encased in a plastic bell. Concurrently, a processed nasal pressure signal was used as a reference standard to identify real respiratory events...
August 11, 2018: Journal of Clinical Monitoring and Computing
Nicholas Cummins, Alice Baird, Björn Schuller
Due to the complex and intricate nature associated with their production, the acoustic-prosodic properties of a speech signal are modulated with a range of health related effects. There is an active and growing area of machine learning research in this speech and health domain, focusing on developing paradigms to objectively extract and measure such effects. Concurrently, deep learning is transforming intelligent signal analysis, such that machines are now reaching near human capabilities in a range of recognition and analysis tasks...
August 9, 2018: Methods: a Companion to Methods in Enzymology
Laishyang Melody Ouyoung, Brenda Capobres Villegas, Changxing Liu, Guy Talmor, Uttam K Sinha
Background: Menstruation-related hormonal alteration can be detrimental to the professional singing voice of women. Resonance Voice Therapy (RVT) has been proven to improve vocal production. However, no research to date has been conducted examining the subjective, acoustic, and stroboscopic effects of RVT on professional female singers having premenstrual or postmenopausal voice disorders. Aim: The aim of this study is to compare the vocal effects of RVT with a control cervical-thoracic intervention in healthy female singers during the premenstrual phase as well as in postmenopausal singers and to evaluate which intervention will allow singers to improve vocal performance regardless of changes in hormonal status...
2018: Clinical Medicine Insights. Ear, Nose and Throat
Tom Karlsen, Lorentz Sandvik, John-Helge Heimdal, Hans Jørgen Aarstad
OBJECTIVES: Patients with voice-related disorders are ideally treated by a multidisciplinary team. Acoustic voice analysis and patient-reported outcome measures are recommended parts of the clinical assessment. The present paper aims at further documenting the importance of acoustic voice analyses, maximum phonation time (MPT) and Voice Handicap Index (VHI) into clinical investigations. STUDY DESIGN: The participants (N = 80 larynx cancer, N = 32 recurrent palsy, N = 23 dysfunctional, N = 75 degenerative/inflammation (N = 19 various excluded)) were included consecutively at the outpatient laryngology clinic at Haukeland University Hospital...
August 6, 2018: Journal of Voice: Official Journal of the Voice Foundation
Vit Weinberger, Luboš Minář, Michal Felsinger, Petra Ovesná, Markéta Bednaříková, Marta Číhalová, Eva Jandáková, Jitka Hausnerová, Barbora Chaloupková, Michal Zikán
OBJECTIVES: To describe the ultrasound features of benign Brenner tumor in the background of complex clinical and histopathological pictures. MATERIAL AND METHODS: We retrospectively identified patients with histologically confirmed benign Brenner tumor of the ovary who were treated in our institution in 2003-2016, and for whom complete imaging, clinical, perioperative and histopathological data were available in the database. Ultrasound findings were drawn from images and reports using terms and definitions of the International Ovarian Tumor Analysis group and pattern recognition description was applied...
2018: Ginekologia Polska
Nilceneide Ramos Cavalcanti, Bárbara Oliveira Souza, Ana Cristina Côrtes Gama, Adriane Mesquita de Medeiros
PURPOSE: Analyze the effects of the Comprehensive Vocal Rehabilitation Program (CVRP) and the motivational stages during speech therapy in teachers with behavioral dysphonia. METHODS: Retrospective, longitudinal, observational study using data from the medical records of 33 teachers regarding auditory-perceptual, acoustic, self-perception analyses and the Voice Handicap Index (VHI-10) protocol in pre- and post-speech therapy situations, and motivational stages of adherence to treatment...
August 6, 2018: CoDAS
Lígia V L Venâncio, Andreia S F Farinha, M Teresa S R Gomes
Sulphate is a very hydrophilic anion, and, therefore, difficult to be selectively determined in aqueous solution with a coated sensor. Zinc(II) 2,3,9,10,16,17,23,24-Octatosylaminophthalocyanine was used for the first time as a sensitive coating. Selectivity to sulphate regarding chloride was not enough to ignore its contribution in mineral waters, and, therefore, an analytical protocol was carefully designed to allow the determination of both anions with this sensor. Results displayed on the label of eight commercial bottles of mineral waters are within the confidence interval of the values obtained with the FIA-sensor system, both for chloride and sulphate...
November 1, 2018: Talanta
Faustino Núñez-Batalla, Gabriela Vasile, Noelia Cartón-Corona, Daniel Pedregal-Mallo, Marta Menéndez de Castro, Maite Guntín García, Justo Gómez-Martínez, Pilar Carro Fernández, Jose Luis Llorente-Pendás
INTRODUCTION AND OBJECTIVES: Inadequate auditory feedback in prelingually deaf children alters the articulation of consonants and vowels. The purpose of this investigation was to compare vowel production in Spanish-speaking deaf children with cochlear implantation, and with hearing-aids with normal-hearing children by means of acoustic analysis of formant frequencies and vowel space. METHODS: A total of 56 prelingually deaf children (25 with cochlear implants and 31 wearing hearing-aids) and 47 normal-hearing children participated...
August 4, 2018: Acta Otorrinolaringológica Española
Kwonse Kim, Dooseuk Choi, Seokyeon Im
This work proposes the experimental method of using a new matching layer (chemical wood) which can measure the methane gas of the main component in natural gas from a PZT (MS-21) of the most widely using BaTiO3 . The experiment includes a differentiated analysis of envelope voltage, standard Gaussian distribution, acoustic pattern, and energy attenuation in a closed chamber according to an air/methane gas mixture. Experimental devices and methods were used to examine the characteristics of envelope energies via control models and transmission devices using a designed circuit, which could be fitted at resonance points of electrical signal change, frequency change, and pulse change to high sensitive ultrasonic sensors, for energy measurement regarding envelope, pattern, and attenuation...
July 27, 2018: Ultrasonics
Brian Thomas O'Callahan, Jun Yan, Fabian Menges, Eric Anton Muller, Markus B Raschke
Control of photo-induced forces allows nanoparticle manipulation, atom trapping, and fundamental studies of light-matter interactions. Scanning probe microscopy enables the local detection of photo-induced effects, with nano-optical imaging and spectroscopy modalities being used for chemical analysis and the study of physical effects. Recently, the development of a novel scanning probe technique has been reported with local chemical sensitivity attributed to the localization and detection of the optical gradient force between a probe tip and sample surface via infrared vibrationally resonant coupling...
August 6, 2018: Nano Letters
Jun Hu, Tetsuhide Shimizu, Ming Yang
Conventional high power ultrasonic vibration has been widely used to improve manufacturing processes like surface treatment and metal forming. Ultrasonic vibration affects material properties, leading to a flow stress reduction, which is called ultrasonic volume effect. The volume effect contains multi-mechanisms such as stress superposition due to oscillatory stress, acoustic softening by easier dislocation motion and dynamic impact leading to extra surface plastic deformation. However, most researches ignored the stress superposition for the convenience of measurement, and few studies considered ultrasonic dynamic impact since the relatively low ultrasonic energy in macro scale...
November 2018: Ultrasonics Sonochemistry
Mamta Dubey, Amit K Mittal, Jiten Jaipuria, Manisha Arora, Ajay K Dewan, Akhilesh Pahade
BACKGROUND: Transcutaneous laryngeal ultrasound (TCLUS) can assess Vocal folds (VF) by subjectively identifying mobility or objectively by calculating vocal fold displacement velocity (VFDV). Optimal diagnostic approach (subjective assessment, VFDV estimation or a combination of both) is unresolved; hence, we conducted this prospective study in patients undergoing thyroidectomy. METHOD: Two anaesthetists performed TCLUS pre- and post-operatively for functional assessment of 200 VFs on 100 patients...
August 5, 2018: Acta Anaesthesiologica Scandinavica
Anurag Snehi Ramavat, Harsimran Tiwana, Nagamani Banumathy, Jaimanti Bakshi, Naresh Panda, Ashish Goel
OBJECTIVES: The present study was conducted to study the efficacy of intralesional steroid (ILS) injection in small benign vocal fold lesions and compare the outcomes with microlaryngeal surgery in terms of improvement in symptoms and reduction in lesion size. METHODS: The current randomized control trial was conducted in the Department of Otolaryngology at the Postgraduate Institute of Medical Education and Research in Chandigarh between 2014 and 2015. The clinical diagnosis was based on appearance of the lesion during endoscopy and the mucosal vibration pattern...
August 1, 2018: Journal of Voice: Official Journal of the Voice Foundation
Geun-Hyo Kim, Yeon-Woo Lee, In-Ho Bae, Hee-June Park, Soo-Geun Wang, Soon-Bok Kwon
OBJECTIVE: The purpose of this study was to explore the concurrent validity of the Acoustic Voice Quality Index (AVQI) in a Korean population. We investigated the feasibility of its cutoff values and diagnostic accuracy in discriminating between normal and dysphonic voices. MATERIALS AND METHODS: A total of 1,524 native Korean subjects with normal voices (n = 113) and with voice disorders (n = 1,411) were asked to speak and sustain the vowel "a" and to read the Korean text "Walk" aloud...
July 31, 2018: Journal of Voice: Official Journal of the Voice Foundation
Lukasz J Nowak, Karolina M Nowak
BACKGROUND: The area of application of electronic stethoscopes in medical diagnostics covers the scope of usability of the acoustic stethoscopes, from which they have evolved and which they could potentially replace. However, the principle of operation of these two groups of diagnostic devices is substantially different. Thus, an important question arises, regarding the differences in parameters of the transmitted sound and their potential diagnostic consequences in clinical practice...
August 3, 2018: Biomedical Engineering Online
Michael Döllinger, Stefan Kniesburges, David A Berry, Veronika Birk, Olaf Wendler, Stephan Dürr, Christoph Alexiou, Anne Schützenberger
Quantitative analysis of phonatory characteristics of rabbits has been widely neglected. However, preliminary studies established the rabbit larynx as a potential model of human phonation. This study reports quantitative data on phonation using ex vivo rabbit larynx models to achieve more insight into dependencies of three main components of the phonation process, including airflow, vocal fold dynamics, and the acoustic output. Sustained phonation was induced in 11 ex vivo rabbit larynges. For 414 phonatory conditions, vocal fold vibrations, acoustic, and aerodynamic parameters were analyzed as functions of longitudinal vocal fold pre-stress, applied air flow, and glottal closure insufficiency...
July 2018: Journal of the Acoustical Society of America
Soo Jin Park, Gary Yeung, Neda Vesselinova, Jody Kreiman, Patricia A Keating, Abeer Alwan
Little is known about human and machine speaker discrimination ability when utterances are very short and the speaking style is variable. This study compares text-independent speaker discrimination ability of humans and machines based on utterances shorter than 2 s in two different speaking styles (read sentences and speech directed towards pets, characterized by exaggerated prosody). Recordings of 50 female speakers drawn from the UCLA Speaker Variability Database were used as stimuli. Performance of 65 human listeners was compared to i-vector-based automatic speaker verification systems using mel-frequency cepstral coefficients, voice quality features, which were inspired by a psychoacoustic model of voice perception, or their combination by score-level fusion...
July 2018: Journal of the Acoustical Society of America
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