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Psychoacoustic Perception of Equal Instrumental Chords Distributed Differently in Stereo
Juren, Vojtěch ; Musil, Jaroslav (referee) ; Jirásek, Ondřej (advisor)
This thesis deals with psychoacoustic perception of equally instrumented chords distributed differently in stereo. Also this thesis deals with psychoacoustic perception of unequally instrumented chords distributed differently in stereo. The thesis shows what is psychoacoustic perception, according to what is sound color determined, how does masking work between sounds and for people. Next, it shows examined chords which were differently distributed in stereo. These chords were listened by 72 listeners. They did, according to given scale, evaluate intelligibility of instruments within the chord where every individual tone was played by different instrument. The instruments were categorized into three categories according to their creating higher harmonic components. Also, the listeners evaluated intelligibility of the chords. The data were evaluated with help of psychoacoustic method called semantic differential and the results were set.
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Psychoacoustical Measurement of Binaural Hearing Characteristics
Novotný, Ota ; Trzos, Michal (referee) ; Schimmel, Jiří (advisor)
This diploma thesis deals with a binaural hearing issues (it means hearing by both of ears), a human hearing ability to locate position of a sound source at three-dimensional space and parameters that affect this ability. In the second part, it focuses on psychoacoustic experiment, its main features and errors that can occur and which affect a results credibility. Method of pair comparisons is described more closely here. The last part of this thesis describes a technical solution of experiment in Java environment. The application should have a graphical interface and should be able to register a new user and perform a psychoacoustical experiment. The process of experiment is following. The aplication selects a random position of defined virtual sound source on the defined range and it plays this sound into headphones on button click. The users task is to set the application controls, representing a virtual sound source position, that way, where the user hear the sound come from. On another button click the application plays the same sound, but this sound comes from application controls set position (set by user). User compares this pair of sounds and modifies the position of second sound source until these two positions are same. The application stores these results for later processing on another button click. Principles of generating testing sound sources (sine wave, narrowband noise and sound file with wav extension) and their 3D positioning by measured head model impulse responses correlation are described thereinafter. An ability of human hearing system to locate a virtual sound source in dependence on sound parameters is discussed in conclusion.
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The Spectrum analysis of different types of saxophones
Greiplová, Barbora ; Mojdl, Edgar (referee) ; Jirásek, Ondřej (advisor)
The bachelor thesis deals with the sound of three types of Yamaha saxophones, specifically soprano, alto and tenor saxophone. Lists the basic parameters of the instrument, how it forms the tone and how it is typical. It focuses on characteristics in its tone using spectral analysis, LPC analysis and directional characteristics. The work focuses on the common properties of saxophones as instruments, it also looks for differences between selected types of saxophones and between individual tones. The results are compared in graphs, tables and verbal evaluation.
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Audio Signal Declipping and Dequantization Using Sparsity-Based Methods
Záviška, Pavel ; Šroubek,, Filip (referee) ; Koldovský,, Zbyněk (referee) ; Rajmic, Pavel (advisor)
Audio signály jsou náchylné k různým typům poškození, přičemž jedním z nejčastějších a nejproblematičtějších druhů poškození je clipping. Tato dizertační práce se zaměřuje na rekonstrukci zvukových signálů poškozených nelineárním zkreslením s hlavním zaměřením na declipping a dekvantizaci a popisuje vědecký přínos v této oblasti s využitím metod založených na řídké reprezentaci. První část dizertační práce se zabývá problematikou declippingu a představuje několik přístupů založených na řídkých reprezentacích signálů. Součástí je jak originální výzkum, tak i převzaté algoritmy, které však byly v rámci této práce reimplementovány nebo modifikovány. Kvalita výstupů rekonstrukčních algoritmů je vyhodnocena jak pomocí ukazatele SDR, tak i s využitím percepčně založených metrik. V další části se práce zaměřuje na zakomponování psychoakustiky do problému declippingu pomocí váhování transformačních koeficientů s třemi navrženými způsoby konstrukce vah. Je zde dokázáno, že při správně zvolených vahách je možné výrazně zlepšit kvalitu rekonstrukce a vyrovnat se tak nejlepším algoritmům při zachování nízké výpočetní náročnosti. V poslední části práce je pozornost je také věnována metodám umožňujícím odchylku ve spolehlivé části signálu. V tomto směru práce zkoumá percepční vliv prostého nahrazení těchto spolehlivých vzorků, identifikuje jeho hlavní nevýhody a následně představuje metody, které kompenzují negativní efekty způsobené tímto nahrazením. Je ukázáno, že s využitím těchto technik je možné bez významného navýšení výpočetní náročnosti výrazně zlepšit dosaženou kvalitu rekonstrukce. Vybrané algoritmy jsou rovněž aplikovány na problém audio dekvantizace. Součástí práce jsou repozitáře obsahující implementace všech představených metod.
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Therapeutical procedures based on acoustic and communicative material
Bečvářová, Jana ; Volín, Jan (advisor) ; Skarnitzl, Radek (referee)
The aim of this thesis was to explain therapeutic possibilities of sound in all its connections. Sound is described in relation to several disciplines. Initially, sound is presented as an acoustic and psychoacoustic phenomenon, followed by characterization of physiology of auditory system and findings from psychology of music. The focus of the thesis is anchored in the chapter dedicated to healing and corrective effects of sound - the music therapy. After short history context is presented, the characteristics and analysis of contemporary situation are discussed. Several types of sound - noise, music and sound of speech - are studied in their positive as well as negative influence on psychic and physical health of human. Current research is represented by selection of relevant papers (n=9) which are assessed by the criterion of credibility and rigidness of methodology. This aspect is also perceived as an essential one for the future research in the area of sound effect on human psychic and physical health.
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Analysis of pitch perception depending on the spectrum
Slávik, Martin ; Indrák, Michal (referee) ; Jirásek, Ondřej (advisor)
This thesis is dealing with the research of the influence of individual harmonic components on the perception of sound height. As a part of the work has been made an internet questionnaire on a web address www.analyzavyšek.9e.cz, where individual respondents completed listening test compound of 46 samples. This experiment is based on semantic differential method. Individual samples are compound of sine wave – tone and examined sample, which respondents evaluates on three bipolar scales. The samples were either modelled by additive synthesis or modified sampled sounds of instruments. Individual samples were divided to four major groups and other minor groups for clarity. The purpose was to find which parts, combinations and harmonic components of sound and tone can affect perception of tone height.
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The Influence of single harmonics or formants on timbre color perception
Klimeš, Martin ; Indrák, Michal (referee) ; Jirásek, Ondřej (advisor)
This thesis is dealing with the research of the influence of individual harmonic on the perception of sound color. An application was created with a questionnaire in which respondents assessed a total of 29 samples on different bipolar scales.The samples were either modeled by additive synthesis or created by modifying musical instruments. The aim was to investigate how and what combinations of higher harmonic affect the perception of sound color. The experiment is based on the semantic differential method. The samples were divided into several groups and within these groups they were compared and related to the expected color perception.
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Psychoacoustic Perception of Equal Instrumental Chords Distributed Differently in Stereo
Juren, Vojtěch ; Musil, Jaroslav (referee) ; Jirásek, Ondřej (advisor)
This thesis deals with psychoacoustic perception of equally instrumented chords distributed differently in stereo. Also this thesis deals with psychoacoustic perception of unequally instrumented chords distributed differently in stereo. The thesis shows what is psychoacoustic perception, according to what is sound color determined, how does masking work between sounds and for people. Next, it shows examined chords which were differently distributed in stereo. These chords were listened by 72 listeners. They did, according to given scale, evaluate intelligibility of instruments within the chord where every individual tone was played by different instrument. The instruments were categorized into three categories according to their creating higher harmonic components. Also, the listeners evaluated intelligibility of the chords. The data were evaluated with help of psychoacoustic method called semantic differential and the results were set.
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The analysis of the clarinet spectrum from different manufacturers
Suchánek, Tomáš ; Mojdl, Edgar (referee) ; Jirásek, Ondřej (advisor)
Bachelor’s thesis focuses on spectral analysis of six B clarinets made by manufacturers Buffet Crampon, RZ Woodwind Manufacturing and Yamaha. Instruments were tested by two professional musicians with different timbral preferences and the resulting spectrum is then applied to how psychoacoustic measurements define timbre perception. Furthermore, the impact of different dynamics or reeds is discussed and significant part of analysis also describes directivity patterns of individual higher harmonics or characteristic formant areas.
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The analysis of psychoacoustic perception of chords composed from different full and variously colored signals
Vejmělka, Daniel ; Musil, Jaroslav (referee) ; Jirásek, Ondřej (advisor)
This thesis is dealing with the impact of frequency spectrum of musical sounds on psycho-acoustical perception of the listener. It studies how differently filled harmonic spectrums can influence listener’s ability to determine individual notes in a chord and what influence, on recognizability of a chord, inharmonic elements have. It explores different methods of psycho-acoustic measurements and further data processing. The experiment is based on a method of paired comparisons and was realized in a form of listening test with more than 100 participants. The test is focused on typical representatives of different groups of musical instruments. It studies the impact of different colors of sound used in different types of chords. It further deals with statistical processing of the recovered data.
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