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Modern pitch-shifting algorithms and its aplication in virtual musical instruments
Křupka, Aleš ; Balík, Miroslav (referee) ; Trzos, Michal (advisor)
This diploma thesis deals with pitch shifting methods of acoustical signals. The theoretic part of this thesis involves description of three different pitch shifting techniques, these are the method using a modulated delay line, PICOLA method and method using a phase vocoder. The first two methods represent the processing in time domain, the third method represents the processing in frequency domain. In relation with the PICOLA method, the thesis also mentions algorithms for pitch estimation. The practical part demonstrates the use of these methods. There is described a sampler virtual musical instrument based on the playback of the sounds stored in memory. In this part the particular units providing the required functionality are described. The generating of sounds is controlled by the MIDI protocol. In the sampler is implemented the PICOLA method.
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Audio effect for pitch modification
Čermák, Václav ; Sysel, Petr (referee) ; Schimmel, Jiří (advisor)
This thesis deals with the realisation of an effect for real-time pitch detection and pitch shifting. At first, properties and basic operations of audio signals are analyzed for time and frequency analysis. An emphasis is placed on signal conversion from the time domain to the frequency domain. Methods for audio pitch shifting, fundamental frequency detection and voiced parts determination are discussed next. The practical part describes design of relevant algorithms, their implementation in Matlab environment and evaluation of the results. Evaluation is followed by the creation of a VST plug-in for real-time pitch shifting, which contains chosen algorithms from the previous section and is the final output of this thesis.
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Harmonic pitch shifting
Cihelková, Tereza ; Holan, Tomáš (advisor) ; Pergel, Martin (referee)
This thesis describes the design and implementation of audio effect for pitch shifting of monophonic singing signals. The effect can generate two pitch shifted voices from input signal in real-time, while preserving formants. Amount of the shift can be controlled via MIDI controller. The effect is implemented as VST module in the form of dynamic-link library. This work also includes theoretical introduction to related DSP techniques.
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Harmonic pitch shifting
Cihelková, Tereza ; Holan, Tomáš (advisor) ; Pergel, Martin (referee)
This thesis describes the design and implementation of audio effect for pitch shifting of monophonic singing signals. The effect can generate two pitch shifted voices from input signal in real-time, while preserving formants. Amount of the shift can be controlled via MIDI controller. The effect is implemented as VST module in the form of dynamic-link library. This work also includes theoretical introduction to related DSP techniques.
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Modern pitch-shifting algorithms and its aplication in virtual musical instruments
Křupka, Aleš ; Balík, Miroslav (referee) ; Trzos, Michal (advisor)
This diploma thesis deals with pitch shifting methods of acoustical signals. The theoretic part of this thesis involves description of three different pitch shifting techniques, these are the method using a modulated delay line, PICOLA method and method using a phase vocoder. The first two methods represent the processing in time domain, the third method represents the processing in frequency domain. In relation with the PICOLA method, the thesis also mentions algorithms for pitch estimation. The practical part demonstrates the use of these methods. There is described a sampler virtual musical instrument based on the playback of the sounds stored in memory. In this part the particular units providing the required functionality are described. The generating of sounds is controlled by the MIDI protocol. In the sampler is implemented the PICOLA method.
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