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Analysis of Speech Signals for the Purpose of Neurological Disorders IT Diagnosis
Mekyska, Jiří ; Dostál, Otto (referee) ; Přibilová, Anna (referee) ; Smékal, Zdeněk (advisor)
This work deals with a design of hypokinetic dysarthria analysis system. Hypokinetic dysarthria is a speech motor dysfunction that is present in approx. 90 % of patients with Parkinson’s disease. The work is mainly focused on parameterization techniques that can be used to diagnose or monitor this disease as well as estimate its progress. Next, features that significantly correlate with subjective tests are found. These features can be used to estimate scores of different scales like Unified Parkinson’s Disease Rating Scale (UPDRS) or Mini–Mental State Examination (MMSE). A protocol of dysarthric speech acquisition is introduced in this work too. In combination with acoustic analysis it can be used to estimate a grade of hypokinetic dysarthria in fields of faciokinesis, phonorespiration and phonetics (correlation with 3F test). Regarding the parameterization, features based on modulation spectrum, inferior colliculus coefficients, bicepstrum, approximate and sample entropy, empirical mode decomposition and singular points are originally introduced in this work. All the designed techniques are integrated into the system concept in way that it can be implemented in a hospital and used for a research on Parkinson’s disease or its evaluation.
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Analysis of Speech Signals for the Purpose of Neurological Disorders IT Diagnosis
Mekyska, Jiří ; Dostál, Otto (referee) ; Přibilová, Anna (referee) ; Smékal, Zdeněk (advisor)
This work deals with a design of hypokinetic dysarthria analysis system. Hypokinetic dysarthria is a speech motor dysfunction that is present in approx. 90 % of patients with Parkinson’s disease. The work is mainly focused on parameterization techniques that can be used to diagnose or monitor this disease as well as estimate its progress. Next, features that significantly correlate with subjective tests are found. These features can be used to estimate scores of different scales like Unified Parkinson’s Disease Rating Scale (UPDRS) or Mini–Mental State Examination (MMSE). A protocol of dysarthric speech acquisition is introduced in this work too. In combination with acoustic analysis it can be used to estimate a grade of hypokinetic dysarthria in fields of faciokinesis, phonorespiration and phonetics (correlation with 3F test). Regarding the parameterization, features based on modulation spectrum, inferior colliculus coefficients, bicepstrum, approximate and sample entropy, empirical mode decomposition and singular points are originally introduced in this work. All the designed techniques are integrated into the system concept in way that it can be implemented in a hospital and used for a research on Parkinson’s disease or its evaluation.
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Analysis of spectral changes in speech affected by orthodontic appliances
Přibil, Jiří ; Přibilová, Anna
This paper is focused at investigation of influence of the upper removable plate and the lower fixed orthodontic brackets and their combination on spectral properties of produced speech. Spectral changes were analyzed and evaluated by spectrograms and mean Welch’s periodograms. From obtained results follows that the removable orthodontic appliance mainly affects spectrograms of speech, and these changes are most significant in voiced parts of spectrograms – corresponding to vowels, voiced consonants etc.
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Konverze pohádkových hlasů pro TTS systém s kepstrálním popisem
Přibil, Jiří ; Přibilová, Anna
Our recent research in improvement of text-to-speech (TTS) synthesis was aimed at storytelling speaking style in addition to its multi-voice realization and expression of emotional states. Storytelling speaking style is suitable for applications aimed at children as well as applications aimed at blind people. In this contribution the experiments with the storytelling voice conversion performed on the short sentences of stories in Slovak and Czech are described.
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Hodnocení změny hlasu v TTS systému s kepstrálním popisem
Přibil, Jiří ; Přibilová, Anna
Voice conversion, i.e. modification of a speech signal to sound as if spoken by a different speaker, finds its use in speech synthesis with a new voice without necessity of a new database. It is very useful in special aids for blind and partially sighted people, e.g. Braille notetaker based on the Pocket PC. This paper evaluates voice conversion implemented in the Czech and Slovak text-to-speech (TTS) system based on cepstral description of speech database using the source-filter speech model.
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Realizace TTS jako systémového ovladače pro Microsoft Speech API
Přibilová, Anna ; Přibil, Jiří
The paper deals with implementation of voice modification in the Czech and Slovak text-to-speech /TTS/ system as Microsoft speech application programming interface /MS SAPI/ TTS engine based on diphone inventory. The original male voice database serves for creation of three derived databases with modification factors given by the average formant and pitch shift between male, female and childish voices. The source-filter model as well as the harmonic speech model, both with cepstral description, were used.
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Frequency scale mapping methods for voice conversion
Přibilová, Anna
The research report compares several approcaches to frequency scale mapping for voice conversion. All the presented methods may be used for transformation of voice characteristics between male and female or childisch. The advantage of the proposed non-linear methods is possibility of their implementation in the text-to-speech systems with cepstral description because of the unchanged number of points of the modified speech spectrum envelope in FFT-based methods.
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Modifikace obálky řečového spektra
Přibilová, Anna
The paper is aimed at speech spectrum envelope modification for voice conversion. Spline interpolation using digital filtering techniques with cubic B-splines is applied to speech spectrum envelope determination. Modification of the determined spectrum envelope is performed as the formant shift by a constant factor corresponding to the mean formant shift between male and female voices. Together with pitch modification by a constant factor, voice conversion from male to female and vice versa is performed.
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