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Real-Time Analysis of Audio Signals
Řezáč, Martin ; Schimmel, Jiří (referee) ; Černocký, Jan (advisor)
The goal of this thesis is creation an application, which can perform real-time fundamental frequency tracking of incoming audio samples. According to detected frequencies, the program generates MIDI messages, which are sent to chosen MIDI device. First, the reader is introduced to the issue of fundamental frequency tracking. The following part describes individual methods, especially the one based on spectral analysis of a tone. A description of used technologies is also a included in this part of this thesis. In the following part, the implementation and testing of application are described including opinions of several musicians about this product. At the end, the whole work is concluded and the possible further development is outlined.
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Acoustic tuner with audio output
Kučera, Josef ; Krajsa, Ondřej (referee) ; Schimmel, Jiří (advisor)
The aim of this bachelor thesis is to compare selected algorithms used in practice for tuning indication. Within the thesis, the selected algorithms are tested in Matlab environment on a series of audio samples, in order to select the most suitable algorithm for the realization of the tuner. The selected algorithm is implemented on the Arduino platform using Arduino IDE enviroment. Moreover, a voice output is created for tuning indication.
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Ways of exploiting fundamental frequency for speaker identification
Hývlová, Dita ; Skarnitzl, Radek (advisor) ; Šturm, Pavel (referee)
The present Master's thesis deals with the forensic use of fundamental frequency characteristics, specifically with F0 mean values and indicators of variability. Phoneticians who specialise in the forensic analysis of speech generally believe that F0 does not hold much potential as a parameter useful for speaker identification, mainly because it is easily influenced by extrinsic factors (e.g. the speaker's emotional state, interfering noise, transmission channel or even the speaker's own effort to mask his voice), which cause high intra-individual variability. Despite these facts, however, the forensic use of F0 offers a number of advantages, namely straightforward extraction from the speech signal and lower susceptibility to varying lexical content - unlike, for example, vowel formants. This thesis investigates the recordings of 8 male speakers made in two different speech styles (spontaneous and read) and compares the respective indicators of F0 stability and variability, in particular those that are robust in varying external conditions: that is, the baseline for mean values and the 10.-90. percentile range for variability indicators. Apart from that, we take into account phenomena such as the creaky voice, which are idiosyncratic and contribute to easier speaker discrimination. Key words:...
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Perceptual sensitivity to music and speech stimuli in the frequency and temporal domains
Lukeš, David ; Volín, Jan (advisor) ; Skarnitzl, Radek (referee)
The subject of this thesis is perceptual sensitivity with respect to subtle frequency-based and temporal manipulations in speech, music and mixed stimuli. We hypothesize that an individual's sensitivity to variation in all three types of stimuli should be similar (i.e. a correlation should exist), seeing that findings in evolutionary biology, neurosciences, psy- chology and experimental phonetics are pointing towards a relatively strong link between the mechanisms of perception in speech and music. Our listening experiment revealed mostly intermediate correlations; additionally, we argue that by employing syntactically less complicated stimuli, which would target specifically fundamental sensitivity without requiring a complex syntactic analysis in parallel, even more robust correlations could be obtained. While the influence of prior formal linguistic education on performance in the test was negligible, the influence of musical experience was considerable, which lends further support to the idea of simplifying especially the music stimuli in future research. Key words: music, speech, perception, sensitivity, correlation
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The just noticeable difference for English melodic prominence elicited on Czech listeners
Brabcová, Kateřina ; Šturm, Pavel (advisor) ; Tichý, Ondřej (referee)
The aim of the thesis is to ascertain whether and how the modification of pitch in the acoustic signal influences what we hear, i.e. whether we perceive a difference between the original, unmodified stimulus and the one with a modified melodic contour. The theoretical part of the thesis explains terms such as: the fundamental frequency and its contour, the just noticeable difference, intonation and the structure of intonational phrases, and the difference between English and Czech intonational structure. The practical part uses recordings of Standard British English. The contour of the fundamental frequency (F0) is changed at different places of the intonation phrase (the nuclear syllable, stressed and unstressed syllables of the head) and the pitch is either lowered or raised by 1.5 semitones with respect to the original production. The main goal is (1) to determine the influence of the melodic prominence of a syllable on the pitch manipulation detection (judged by 20 listeners of Czech origin, all students of English) and (2) to find out which other factors (such as the already mentioned direction of the change) might be significant. The results are analysed and their statistical significance is evaluated.
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Real-Time Analysis of Audio Signals
Řezáč, Martin ; Schimmel, Jiří (referee) ; Černocký, Jan (advisor)
The goal of this thesis is creation an application, which can perform real-time fundamental frequency tracking of incoming audio samples. According to detected frequencies, the program generates MIDI messages, which are sent to chosen MIDI device. First, the reader is introduced to the issue of fundamental frequency tracking. The following part describes individual methods, especially the one based on spectral analysis of a tone. A description of used technologies is also a included in this part of this thesis. In the following part, the implementation and testing of application are described including opinions of several musicians about this product. At the end, the whole work is concluded and the possible further development is outlined.
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