National Repository of Grey Literature 14 records found  1 - 10next  jump to record: Search took 0.00 seconds. 
The construction for the innovative Jecklin Disk microphone technique
Strážnický, Martin ; Musil, Jaroslav (referee) ; Jirásek, Ondřej (advisor)
The thesis deals with the design and subsequent measurement of the parameters of the Jecklin disc pair microphone array. The theoretical part deals with human hearing, microphone characteristics and types of stereo microphone technology. The practical part focuses on the measurement of the directivity and width of the stereo image when changing the configuration of the array. The measured results are then verified in practice by recording acoustic musical instruments.
Analysis of the radiation of accordions and designing the spatial arrangement of microphones for their recording
Rapáč, Marek ; Musil, Jaroslav (referee) ; Jirásek, Ondřej (advisor)
This bachelor’s thesis deals with the analysis of the spectrum and directivity of three different accordions.Two of the analyzed instruments are piano accordions with standard basses, one accordion is a special type of piano accordion, the so-called bass accordion.The effect of the played tone and used register on the spectrum and on the directionality of the resulting tone is described. The resulting findings are also compared between different accordions. The final part of the thesis is devoted to the practical use of stereo microphone techniques for high-quality, faithful and listener-friendly recording of the accordion sound. In conclusion, these findings are evaluated and the most suitable stereo microphone technique for recording the accordion is presented here.
The Vowel directionality analysis
Sádecká, Denisa ; Musil, Jaroslav (referee) ; Jirásek, Ondřej (advisor)
This final thesis attends to comparing different vowels, words and sounds recorded from five individual narrators. In this work the differences and similarities of the male and female speech or pronounciation, the distinction and resemblance in character of Slovak and Czech narrator are all discussed. Work also approaches the difference in pronounciating words which contain the vowel „r“ pronounced subjectively correctly and also spoken by a person with Rhotacism, a speech impediment. During a recording in an anechoic chamber the position of microphone system creating a semicircle was switched from horizontal to vertical axis while rotating the voice actor‘s position from facing the microphones to turning their back to them. For the comparison of sound recordings, signal‘s spectogram and spectograph generated in MatLab environment were used alongside with Praat – speech and phonetics environment. Polar graphs, mapping the directivity of vowels come from Microsoft Excel and LPC graphs from Praat software as well.
The Innovation of organ pipes
Holba, Stanislav ; Musil, Jaroslav (referee) ; Jirásek, Ondřej (advisor)
The thesis deals with the sound colour of organ pipes in relation to the way of tone excitation, physical dimensions of organ pipes and the construction material used. The sound colour of individual organ pipes is described by means of spectral analysis and selected psychoacoustic variables. The obtained knowledge is further used for the production of organ pipes from atypical materials and modification of conventional organ pipes. Resonator simulations are performed for the materials used for the production in order to determine the theoretical value of the resonant frequencies. These values are compared with the results of spectral analysis of the sound of physical organ pipes.
Analysis of the perception of chords in a space with different reverberations
Adamkovičová, Lenka ; Musil, Jaroslav (referee) ; Jirásek, Ondřej (advisor)
This bachelor’s thesis is dealing with an analysis of subjective perception of chords in spaces with different reverberation parameters. An algorithmic reverb with 5 different settings of parameters was used on 32 chords or intervals created by either additive synthesis or from sampled real instruments. The modified sounds were then judged on 5 different bipolar scales by 100 respondents in a listening test. The goal of this work was to find the influence of reverbs with different parameters on perception of dissonance, pleasantness, roughness, and timbre of individual chords. Survey results were then plotted in graphs, in which they were compared to each other.
Analysis of the spectrum of cymbals and their time envelopes
Adamják, Adam ; Musil, Jaroslav (referee) ; Jirásek, Ondřej (advisor)
This Bachelor Thesis deals with the analysis of idiophones, the description of the measuring chain, and the analysis of the spectrum and time course of the measured samples. Based on spectral analysis, individual parameters and influences on the sound of cymbals were evaluated, such as the location of the blow or the type and hardness of the drum sticks. The theoretical basis also deals with the basic theory of the sound signal to the issue of noise and psychoacoustic perceptions. The conclusion deals with the basic mechanical properties and puts them into context with spectral analysis.
Analysis of Spectra of Electric Guitars Made of Various Materials
Zezulová, Eliška ; Musil, Jaroslav (referee) ; Jirásek, Ondřej (advisor)
Bachelor‘s thesis focuses on the spectral analysis of two electric guitars. The Cort X-6 electric guitar is used for harder genres of music. The second Fokus-H Strat guitar is more of a rock-universal type of instrument. The work deals with the spectrums of tones using various guitar pickups and analyzes them with the use of psychoacoustic measurements in the perception of timbre. It examines variations in the sound spectrum when there’s a manipulation with tone and gain controls. The measured values of the tone control are divided into thirds of the potentiometer range. The volume has been halved. The following is a look at the change of sound spectrum when using a harder plectrum. The end of the work is devoted to the difference in colors of two tones that were recorded under the same conditions. Their difference lies in the way of holding the neck of an electric guitar.
The Innovation of clarinet bell using Bessel functions
Kudělka, Josef ; Musil, Jaroslav (referee) ; Jirásek, Ondřej (advisor)
The bachelor's thesis focuses on the comparison of the influence of clarinet bells on its final spectrum and directional characteristics. It compares the original bell with other bells designed using Bessel sound pipes and made of ABS plastic. It also investigates the principles of tone formation and the necessary theoretical basis.
Analysis of Resonance Cabinets of Different Types of Acoustic Guitars
Juhaščik, Lukáš ; Musil, Jaroslav (referee) ; Jirásek, Ondřej (advisor)
Bacherlor‘s thesis deals with spectral analysis of guitar body. The aim of the study is the place of resonantion modes at whole body, its frequency and the impact to the final sound.
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.

National Repository of Grey Literature : 14 records found   1 - 10next  jump to record:
See also: similar author names
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