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1
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Analysis of Polish Pathological Speech by Higher Order Spectrum

100%
Wszołek W., Kłaczyński M.
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issue 1
190-191
EN
This paper presents a next, consecutive stage of the authors' research, concerning the search for additional signal processing methods, which could be used for objective detection and registration of pathological changes in the larynx and vocal tract area. This paper presents pathological speech analyzing by suitably directed higher order spectra analysis (HOSA).
2
Content available remote

Reduction of Speech Signal Deformation in Patients after Nasal Septum Surgery (Septolplasty)

81%
Konior M., Kłaczyński M., Wszołek W.
Acta Physica Polonica A
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2011
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vol. 119
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issue 6A
1000-1004
EN
Nasal blockage belongs to the most common symptoms of nasal diseases in vocal tract area. At the same frequency there appear acoustic symptoms, existing as the change of human voice color. Vocal and articulation disorders of the ear, nose ane throat are usually observed in the form of closed rhinolalia and this observation can be performed both by patients and other listeners as well. Nasal polyps and nasal septum deviation are frequent reason of nasal blockage connected in consequence with decreased nasal ventilation. One of the main principles of the surgical treatment performed in mentioned situations is the restoration of nasal patency. The evaluation of the influence of nasal surgery on intensification of acoustic symptoms depends on verification of parameters of the human speech signal, so it was necessary to apply objective methods. That allowed to combine results of acoustic analysis with patient's subjective feeling and rhinomanometric evaluation of nasal patency. The main purpose of this research was to objectively evaluate the influence of surgical treatment improving nasal patency on deformation of the voice of operated patients.
3
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Investigation on Vibrations of a Cantilever Beam with Magnetorheological Fluid by Using the Acoustic Signal

81%
Snamina J., Sapiński B., Wszołek W., Romaszko M.
Acta Physica Polonica A
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2012
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vol. 121
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issue 1A
A-188-A-190
EN
The paper presents results of laboratory investigations of a vibrating three-layer cantilever beam with magnetorheological fluid. The goal of the study was to determine changes of the acoustic field around the vibrating beam caused by modifications of the magnetorheological fluid properties. The experimental studies have been carried out on a dedicated measuring stand. The construction of the measuring stand allows fixing one end of the beam in a holder attached to the moving part of the electrodynamic shaker. The magnetic field is produced by an external electromagnet. During the measurements the beam displacements and the acoustic pressure have been simultaneously registered. Frequency analysis of the registered signals has been carried out in 1/12 octave bands near the second natural frequency of the beam. The results reveal that the acoustic signal emitted by the vibrating beam decreases when the magnetic field is applied.
4
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Signal Processing and Analysis of Pathological Speech Using Artificial Intelligence and Learning Systems Methods

81%
Wszołek W., Izworski A., Izworski G.
Acta Physica Polonica A
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2013
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vol. 123
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issue 6
995-1000
EN
In this paper, selected results are presented of research which is carried on for over a decade and covers valuation of chosen signal processing methods suitable to analyze and valuate pathological speech. This valuation is necessary during solving many medical diagnostics problems and when planning therapy and rehabilitation of certain types of diseases. All presented examples are used in clinical practice in the area of dentistry, dental surgery, otolaryngology and most of all, in phoniatrics and speech correction.
5
Content available remote

Analysis of Voice Modifications for Persons After Tonsillectomy

71%
Potępa Ł., Szaleniec J., Wszołek W., Steczko A., Składzień J.
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vol. 125
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issue 4A
A-49-A-56
EN
The goal of the research described in the present paper was the determination of modification range for voice acoustic parameters resulting from tonsillectomy. Within the scope of the described research program, an attempt has been made to determine the changes of selected voice parameters for persons after such a treatment and also to elaborate work out some premises for prediction of potential voice modifications for persons who have not yet decided to undergo such a treatment. In order to achieve the goal, analyses have been carried out for voice utterances of persons before the tonsillectomy surgery and after the treatment. The first voice recordings took place between one and three days before the surgery. The post-treatment recordings have been carried out about 6 weeks after the surgery, as a procedure accompanying the follow-up examinations. In the present paper, an analysis has been carried out concerning phonemes /a/, /e/, /i/, and /u/ with prolonged phonation. The completed research shows that for evaluation of voice modification in the aspect of changes resulting from tonsillectomy, the most useful parameters are some of the mel-cepstral coefficients, the formant frequencies, and also the relative power coefficients.
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