scholarly journals Vocal therapy with larynx compression after partial laryngectomy

2011 ◽  
Vol 64 (7-8) ◽  
pp. 357-361 ◽  
Author(s):  
Gordana Mumovic
Keyword(s):  
Fundamental Frequency ◽  
Signal To Noise Ratio ◽  
Frequency Standard ◽  
Partial Laryngectomy ◽  
Manual Compression ◽  
Acoustic Parameters ◽  
Voice Analysis ◽  
Acoustic Voice Analysis ◽  
Group I ◽  
Noise Ratio

The aim of the study was to establish the effects of the vocal therapy by manual compression of the larynx on dysphonia due to a partial laryngectomy and compare them with the effects of the standard vocal therapy. The prospective study included 66 patients submitted to any partial laryngectomy type. The patients were randomly classified into two groups: Group I (33) receiving the standard vocal therapy, and Group II (33) submitted to larynx compression vocal therapy. The 6-week vocal treatment was performed. The treatment effects were evaluated by subjective and objective voice analysis methods. The subjective and objective acoustic voice analysis revealed a significant influence (p<0.05) of either of the two vocal therapy modes on initial dysphonia. The larynx compression vocal therapy had better effects on the acoustic parameters: habitual fundamental frequency, mean fundamental frequency, standard deviation of fundamental frequency, maximal fundamental frequency, harmonics-to-noise ratio, and signal-to-noise ratio.

scholarly journals Acoustic analysis of voice in children with cochlear implants

2014 ◽  
Vol 67 (suppl. 1) ◽  
pp. 32-37 ◽  
Author(s):  
Maja Miljkovic ◽  
Mila Veselinovic ◽  
Ivana Sokolovac ◽  
Dragan Dankuc ◽  
Zoran Komazec ◽  
...  
Keyword(s):  
Cochlear Implants ◽  
Fundamental Frequency ◽  
Acoustic Analysis ◽  
Signal To Noise Ratio ◽  
Normal Hearing ◽  
Speech Development ◽  
Voice Pitch ◽  
Acoustic Parameters ◽  
Noise Ratio ◽  
Hearing Children

Introduction. The focus of this study was the analysis of objective acoustic characteristics of voice in children with cochlear implants. The objective of this study was to compare acoustic parameters of voice in children with cochlear implants and normal hearing children of the same age, and to determine differences, if there were any. Material and Methods. There were 60 children (aged from 6 to 13) included in this prospective study. They were divided into 2 groups: children with cochlear implants (30) and normal hearing children with normal speech development (30). The most stable voice sample was analyzed using a software program Dr Speech: Vocal Assessment. Objective acoustic analysis of voice included 13 acoustic parameters. Results. Standard deviation of fundamental frequency was significantly (p=0.000) higher in children with cochlear implants, as well as the values of harmonic to noise ratio (p=0.003) and signal to noise ratio (p=0.000) parameters. Values of jitter %, shimmer %, normalized noise energy, fundamental frequency tremor and amplitude tremor showed no significant differences between the two groups. However, the values of parameters that refer to voice frequency (habitual fundamental frequency, mean fundamental frequency, min fundamental frequency and max fundamental frequency) and the mean value of voice intensity (p=0.004), were significantly higher in the boys and the girls with cochlear implants than in the normal hearing children. Conclusion. Gender non-related parameters of hoarseness did not show significant differences between the children with cochlear implants and the normal hearing children; the results of cochlear implantation and voice and speech education were therefore positive. However, the children with cochlear implants of both gender showed significantly higher values of voice intensity, voice pitch and insufficient control of voice pitch variation.

Varying Signal-to-Noise Ratios in Adolescent Voice Therapy

1991 ◽  
Vol 22 (3) ◽  
pp. 179-188 ◽  
Author(s):  
Richard D. Saniga ◽  
Margaret F. Carlin
Keyword(s):  
Fundamental Frequency ◽  
Signal To Noise Ratio ◽  
Voice Therapy ◽  
Signal To Noise ◽  
Everyday Activities ◽  
Therapy Program ◽  
Vocal Intensity ◽  
Noise Ratio ◽  
Speaking Voice ◽  
Adolescent Voice

In our society competing noise has become part of most everyday activities. Vocal abusers need to learn to compensate for this auditory distractor. The present paper describes a voice therapy program for adolescent vocal abusers that utilizes a varying signal-to-noise ratio. Once this compensation is learned, vocal abusers can maintain an appropriate fundamental frequency and vocal intensity in their speaking voice.

Application of High Speed Digital Imaging (HSDI) technique and voice acoustic analysis in the diagnosis of the clinical form of Presbyphonia in women

2020 ◽  
Vol 74 (4) ◽  
Author(s):  
Bożena Kosztyła-Hojna ◽  
Emilia Duchnowska ◽  
Maciej Zdrojkowski ◽  
Anna Łobaczuk-Sitnik ◽  
Jolanta Biszewska
Keyword(s):  
Digital Imaging ◽  
High Speed ◽  
Elderly Women ◽  
Voice Quality ◽  
Vocal Folds ◽  
Clinical Form ◽  
Voice Analysis ◽  
Acoustic Voice Analysis ◽  
Group I ◽  
Glottal Insufficiency

<b>Introduction:</b> The aging process of voice begins after the age of 60 and has an individually variable course. Voice quality disorders at this age are called senile voice (Presbyphonia or Vox Senium). Voice pathology is particularly severe in women. The aim of the study was to diagnose the clinical form of Presbyphonia in elderly women using High Speed Digital Imaging (HSDI) and acoustic voice analysis. <br><b>Material and methods:</b> Study included 50 elderly women (average age 69) with dysphonia (Group I). Control group (Group II) included 30 women (average age 71) without voice quality disorders. Visualization assessment has been conducted with High Speed Digital Imaging (HSDI) with High Speed camera (HS). Acoustic evaluation of voice included analysis isolated vowel “a” and continuous linguistic text with Diagnoscope Specialista software. Maximum Phonation Time (MPT) has been determined. <br><b>Results:</b> In Group I, 78% of women revealed vocal folds vibrations asymmetry, vibration amplitude increase, Mucousal Wave (MW) limitation and Type D glottal insufficiency (GTs). Acoustic voice analysis proved decrease in F0, increase in Jitter, Shimmer, NHR. In 22% of women, next to vibrations asymmetry, vibration amplitude reduction and MW limitation, Type E glottal insufficiency (GTs) have been found. Acoustic voice analysis revealed slight decrease in F0 and the presence of numerous non-harmonic components in the glottis region. <br><b>Conclusions:</b> Vocal folds visualization with HSDI showed edema, less often atrophy in elderly women. Both forms of dysphonia were caused abnormal values of F0, Jitter, Shimmer, NHR in the acoustic voice evaluation and significant reduction of MPT.

Measurement of the Signal-to-noise Ratio in an Optically Pumped Caesium-beam Frequency Standard

Metrologia ◽  
1988 ◽  
Vol 25 (1) ◽  
pp. 17-20 ◽  
Author(s):  
V Giordano ◽  
A Hamel ◽  
G Theobald ◽  
P Cerez ◽  
C Audoin ◽  
...  
Keyword(s):  
Signal To Noise Ratio ◽  
Frequency Standard ◽  
Optically Pumped ◽  
Signal To Noise ◽  
Noise Ratio

FRACTAL SPECTROSCOPY BY NOISE-FREE STOCHASTIC MULTIRESONANCE AT HIGHER HARMONICS

2004 ◽  
Vol 14 (01) ◽  
pp. 141-159 ◽  
Author(s):  
A. KRAWIECKI ◽  
S. MATYJAŚKIEWICZ ◽  
J. A. HOŁYST ◽  
K. KACPERSKI
Keyword(s):  
Stochastic Resonance ◽  
Fundamental Frequency ◽  
Control Parameter ◽  
Fractal Structure ◽  
Signal To Noise Ratio ◽  
Spin Model ◽  
Signal To Noise ◽  
Higher Harmonics ◽  
Henon Map ◽  
Noise Ratio

Noise-free stochastic resonance is investigated in two chaotic maps with periodically modulated control parameter close to a boundary crisis: the Hénon map and the kicked spin model. Response of the maps to the periodic signal at the fundamental frequency and its higher harmonics is examined. The systems show noise-free stochastic multiresonance, i.e. multiple maxima of the signal-to-noise ratio at the fundamental frequency as a function of the control parameter. The maxima are directly related to the fractal structure of the attractors and basins of attraction colliding at the crisis point. The signal-to-noise ratios at higher harmonics show more maxima, as well as dips where the signal-to-noise ratio is zero. This opens a way to use noise-free stochastic resonance to probe the fractal structure of colliding sets by a method which can be called "fractal spectroscopy". Using stochastic resonance at higher harmonics can reveal smaller details of the fractal structures, but the interpretation of results becomes more difficult. Quantitative theory based on a model of a colliding fractal attractor and a fractal basin of attraction is derived which agrees with numerical results for the signal-to-noise ratio at the fundamental frequency and at the first two harmonics, quantitatively for the Hénon map, and qualitatively for the kicked spin model. It is also argued that the maps under study belong to a more general class of threshold-crossing stochastic resonators with a modulated control parameter, and qualitative discussion of conditions under which stochastic multiresonance appears in such systems is given.

Practical Acoustics in Clinical Voice Assessment: A Praat Primer

2017 ◽  
Vol 2 (3) ◽  
pp. 14-32 ◽  
Author(s):  
Youri Maryn
Keyword(s):  
Fundamental Frequency ◽  
Software Package ◽  
Sound Level ◽  
Voice Analysis ◽  
Acoustic Voice Analysis ◽  
Voice Assessment ◽  
Frequency Sound ◽  
Level Spectrum ◽  
Graphical Information

Praat is a freely available software package for formatting and analyzing sound signals. It carries many features relevant to voice signals and it has the possibility to run customized scripts. Praat can therefore be employed for acoustic voice analysis for clinical, educational, and research purposes; however, under the condition that voice signals are sampled for sufficient recording quality. This text first addresses recording-related issues and subsequently describes how Praat can be operated to yield numerical and graphical information regarding, for example, fundamental frequency, sound level, spectrum, spectrogram, cepstrum, and cepstrogram.

Determination of the Best Emulsion for the Microscopy of Crystals

1981 ◽  
Vol 39 ◽  
pp. 32-33
Author(s):  
David A. Grano ◽  
Kenneth H. Downing
Keyword(s):  
Spatial Frequency ◽  
Information Transfer ◽  
Signal To Noise Ratio ◽  
Experimental Situation ◽  
Photographic Emulsion ◽  
Modulation Transfer ◽  
Signal To Noise ◽  
Frequency Space ◽  
Noise Ratio

The retrieval of high-resolution information from images of biological crystals depends, in part, on the use of the correct photographic emulsion. We have been investigating the information transfer properties of twelve emulsions with a view toward 1) characterizing the emulsions by a few, measurable quantities, and 2) identifying the “best” emulsion of those we have studied for use in any given experimental situation. Because our interests lie in the examination of crystalline specimens, we've chosen to evaluate an emulsion's signal-to-noise ratio (SNR) as a function of spatial frequency and use this as our critereon for determining the best emulsion.The signal-to-noise ratio in frequency space depends on several factors. First, the signal depends on the speed of the emulsion and its modulation transfer function (MTF). By procedures outlined in, MTF's have been found for all the emulsions tested and can be fit by an analytic expression 1/(1+(S/S0)2). Figure 1 shows the experimental data and fitted curve for an emulsion with a better than average MTF. A single parameter, the spatial frequency at which the transfer falls to 50% (S0), characterizes this curve.

Experiments in Bright-Field Imaging with Hollow-Cone Illumination

1981 ◽  
Vol 39 ◽  
pp. 226-227
Author(s):  
W. Kunath ◽  
K. Weiss ◽  
E. Zeitler
Keyword(s):  
Signal To Noise Ratio ◽  
Carbon Support ◽  
Electronic System ◽  
Optic Axis ◽  
Hollow Cone ◽  
Signal To Noise ◽  
Bright Field ◽  
Noise Ratio ◽  
Single Field ◽  
Field Imaging

Bright-field images taken with axial illumination show spurious high contrast patterns which obscure details smaller than 15 ° Hollow-cone illumination (HCI), however, reduces this disturbing granulation by statistical superposition and thus improves the signal-to-noise ratio. In this presentation we report on experiments aimed at selecting the proper amount of tilt and defocus for improvement of the signal-to-noise ratio by means of direct observation of the electron images on a TV monitor.Hollow-cone illumination is implemented in our microscope (single field condenser objective, Cs = .5 mm) by an electronic system which rotates the tilted beam about the optic axis. At low rates of revolution (one turn per second or so) a circular motion of the usual granulation in the image of a carbon support film can be observed on the TV monitor. The size of the granular structures and the radius of their orbits depend on both the conical tilt and defocus.

Sign in / Sign up

Export Citation Format

Share Document