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Music Source Separation
Holík, Viliam ; Veselý, Karel (referee) ; Mošner, Ladislav (advisor)
Neural networks are used for the problem of music source separation from recordings. One such network is Conv-TasNet. The aim of the work is to experiment with the already existing implementation of this network for the purpose of potential improvement. The models were trained on the MUSDB18 dataset. It was successively experimented with the change of the network structure, transforming signals from the time domain to the frequency domain for the purpose of calculating the loss function, replacing different loss functions with the original one, finding the optimal learning rate for each loss function and gradually decreasing the learning rate during the learning process. The best experiments according to the SDR metric were training with loss functions L1 and logarithmic L2 in the time domain with a higher initial learning rate with its gradual decrease during the learning process. In a relative comparison of the best models to the baseline, it is more than 2.5% improvement.
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Error Analysis of texts written by non-native speakers of Czech
Pfeiferová, Jana ; Šormová, Kateřina (advisor) ; Pierścieniak, Piotr Paweł (referee)
The bachelor thesis deals with the use of language of non-native speakers of the Czech language - specifically students whose first language is Russian. The first part focuses on different approaches to language errors in terms of the theories which deal with the acquisition of the second language. In the second part, written texts of non-native speakers of the Czech language are analyzed by the method of error analysis. Errors are separately analyzed from a grammatical, morphologic, syntactic and lexicological perspective. Then errors are divided into categories and consequently described and interpreted. Interpretation of the errors takes into account the frequency of errors and focuses on intralingual errors and interlingual errors.
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Pronounciation and perceptual acceptability of the sound r in Czech speeches by foreign speakers whose L1 is German
Novotná, Gabriela ; Veroňková, Jitka (advisor) ; Martínek, František (referee)
The topic of this diploma thesis belongs to the field of language acquisition and language learning. It aims to explore Czech as a second and foreign language of speakers whose mother tongue is German, namely concerning the pronunciation of the r-sound and its perceptual acceptability for Czech native speakers. The theoretical part summarizes the area of pronunciation learning and acquisition in a second and foreign language and outlines various pronunciation difficulties German speakers tend to have in Czech. It deals with the rhotics in general and subsequently focuses on the r- sound, both in Czech and in German, as well as in mutual comparison. In the last chapter, the combinatorial qualities of the r-sound which are used as a basis for the practical part are discussed. The practical part describes the conducted research. Five recordings of German students were collected. The students were staying in Prague for one semester with the Erasmus programme exchange and were learning Czech for the first time. For the recordings a written text was constructed which the students read individually. The text emphasized words including the r-sound. From the recordings, various key words were cut off and a perceptual test was compiled and given to Czech native speakers to evaluate the pronunciation of the...
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Perception of English prototypes in Czech and German mono-lingual speakers
Kučerová, Alžběta ; Lancová, Klára (advisor) ; Červinková Poesová, Kristýna (referee)
[The purpose of this thesis is to investigate and describe how semantic prototypes are transferred and perceived from L1 Czech and L1 German participants into their L2 English. This thesis attempts to pinpoint and describe whether there are differences in the perception of the prototypes in the two monolingual groups, with the main focus on typicality judgement, grammatical gender and prepositional prototypes. The main assumed source of differences is considered to be the said L1 language background. A questionnaire was created for both Czech and German participants with seven tasks testing the perception of prototypes in their L2 English and to see whether a L1 to L2 negative language transfer takes place. The analysis shows that in the perception of prototypes within typicality judgement exercises, the two tested L1 groups do not differ largely and that the size of one's specialized vocabulary and the fact, that English is their L2, not L1, seems to play a role. Nonetheless, at the scale of this research, it seems plausible to say that prepositional and grammatical gender prototypes are transferred into the participants' L2. More in-depth research on the topic is needed; however, to confirm or reject these findings.]
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Pronounciation and perceptual acceptability of the sound r in Czech speeches by foreign speakers whose L1 is German
Novotná, Gabriela ; Veroňková, Jitka (advisor) ; Martínek, František (referee)
The topic of this diploma thesis belongs to the field of language acquisition and language learning. It aims to explore Czech as a second and foreign language of speakers whose mother tongue is German, namely concerning the pronunciation of the r-sound and its perceptual acceptability for Czech native speakers. The theoretical part summarizes the area of pronunciation learning and acquisition in a second and foreign language and outlines various pronunciation difficulties German speakers tend to have in Czech. It deals with the rhotics in general and subsequently focuses on the r- sound, both in Czech and in German, as well as in mutual comparison. In the last chapter, the combinatorial qualities of the r-sound which are used as a basis for the practical part are discussed. The practical part describes the conducted research. Five recordings of German students were collected. The students were staying in Prague for one semester with the Erasmus programme exchange and were learning Czech for the first time. For the recordings a written text was constructed which the students read individually. The text emphasized words including the r-sound. From the recordings, various key words were cut off and a perceptual test was compiled and given to Czech native speakers to evaluate the pronunciation of the...
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Pronunciation of consonantal clusters in the Czech speech of Spanish speakers
Pugachova, Kateryna ; Veroňková, Jitka (advisor) ; Škodová, Svatava (referee)
The topic of this thesis belongs to the area of L2 acquisition. It focuses on the Czech as a second/foreign language for native Spanish speakers, specifically on their pronunciation of selected consonantal clusters in comparison with the Czech orthoepic norm. The theoretical part summarizes the problems learning the pronunciation of second/foreign language and describes phonetic systems, syllable structure and specific combinatorial properties of sounds in Czech and Spanish. The practical part describes the research for which thirteen Spanish speakers from different countries and with different length of stay in the Czech Republic were recorded. For the purpose of the research a special text containing the selected consonantal clusters in initial, medial and final position of the word was compiled. Words were examined with a perceptive analysis and the results were processed according to established criteria.
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Glottalization in the combination with non-syllabic prepositions in the Czech speech of Russian speakers
Tolkunova, Yana ; Veroňková, Jitka (advisor) ; Confortiová, Helena (referee)
Glottalization, as significant irregularity of glottal pulsing, fulfils a number of linguistic functions and can occur in various contexts. This paper examines the rate of vowel-related glottalization of non-syllabic prepositions when native Russian speakers read Czech speech. In Czech, just like in other languages there is a relatively high frequency of glottalization. The purpose of this study is to examine the factors that could influence it. The speakers produced a short read text which contained 59 potential neslabičné prepositions where glottalization could occur in standard pronunciation. The basic set of the perceptual analysis and statistical processing consisted of 582 items. The rate of glottalization in individual speakers ranged from 0 % to 90 % , where the average volume is regulary based at 49 %. Statistical significance of differences in the frequency of the analyzed groups created on the basis of monitored aspects were calculated using the chi-square test.
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Error Analysis of texts written by non-native speakers of Czech
Pfeiferová, Jana ; Šormová, Kateřina (advisor) ; Pierścieniak, Piotr Paweł (referee)
The bachelor thesis deals with the use of language of non-native speakers of the Czech language - specifically students whose first language is Russian. The first part focuses on different approaches to language errors in terms of the theories which deal with the acquisition of the second language. In the second part, written texts of non-native speakers of the Czech language are analyzed by the method of error analysis. Errors are separately analyzed from a grammatical, morphologic, syntactic and lexicological perspective. Then errors are divided into categories and consequently described and interpreted. Interpretation of the errors takes into account the frequency of errors and focuses on intralingual errors and interlingual errors.
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Testing of pupils in German language at basic school
KOSOBUD, Ondřej
The main aim of this diploma thesis is to find out, if the level of knowledge of German language at pupils at basic schools in the Czech Republic is increasing, stagnating or decreasing and what factors influence their results. In the theoretic part I am going to deal with testing of pupils in Europe and in the Czech Republic. After that there is introduced a list of all standard assessment tests of German language on level A1 and A2. Then there are compared standard assessment tests ?Fit in Deutsch? and ?Start Deutsch? with the tests of Czech School Inspection from 2012/2013. In the research part I focus on the development of pupils? knowledge of German language at basic schools. The research is based on the assigned tests from 2007, 2010 and 2013. On the basis of these tests and filled questionnaires I am trying to find answers on the set research questions and to check correctness of the set hypotheses or alternatively to find other factors that influence pupils? knowledge of German language.
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