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Restoration of analog sound records form magnetic tapes
Spiššák, Filip ; Vrba, Kamil (referee) ; Rášo, Ondřej (advisor)
The aim of this bachelor thesis is a theoretical analysis of noises that often occur in magnetic audio tape recordings both from objective and subjective point of view. Furthermore, listening test is designed and carried out. In this test, the task of the listener is to evaluate the subjective variable „disturbance rate of unwanted sound in audio recording“ via specific software that was designed for this purpose. From the described noises, unwanted sounds represent the three most frequently occuring ones. It is a so-called „Hiss“ and two variations of „Hum“ noises. Hum is investigated in two dimensions so that the differences in the perception of even and odd harmonics can be analysed. Through a statistical analysis of the collected data, these noises can be classified according to the subjective perception of the specific recordings, which was also the primary purpose of this work. The findings of this thesis indicate that for instance Hiss is the most disturbing noise and that there is not a significant difference in the perception of even and odd harmonics. This information could be useful for the purposes of old record’s restorations, for example when an effort is made to remove specific types of noise. The measurement performed in this work may also help with the planning of other time-consuming and money-consuming listening tests.
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Transformation of ECG leads
Kaspar, Pavel ; Vítek, Martin (referee) ; Hrubeš, Jan (advisor)
Transformation of ECG The aim of this work is to get acquainted with the means of transformation of ECG, and to execute Dower transform and evaluate it’s efficiency. Then, to design and realize a new way of forward and reverse transformation of ECG in MATLAB program for the purpose of data compression, and to evaluate its functionality with signals from CSE database.
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Restoration of analog sound records form magnetic tapes
Spiššák, Filip ; Vrba, Kamil (referee) ; Rášo, Ondřej (advisor)
The aim of this bachelor thesis is a theoretical analysis of noises that often occur in magnetic audio tape recordings both from objective and subjective point of view. Furthermore, listening test is designed and carried out. In this test, the task of the listener is to evaluate the subjective variable „disturbance rate of unwanted sound in audio recording“ via specific software that was designed for this purpose. From the described noises, unwanted sounds represent the three most frequently occuring ones. It is a so-called „Hiss“ and two variations of „Hum“ noises. Hum is investigated in two dimensions so that the differences in the perception of even and odd harmonics can be analysed. Through a statistical analysis of the collected data, these noises can be classified according to the subjective perception of the specific recordings, which was also the primary purpose of this work. The findings of this thesis indicate that for instance Hiss is the most disturbing noise and that there is not a significant difference in the perception of even and odd harmonics. This information could be useful for the purposes of old record’s restorations, for example when an effort is made to remove specific types of noise. The measurement performed in this work may also help with the planning of other time-consuming and money-consuming listening tests.
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Transformation of ECG leads
Kaspar, Pavel ; Vítek, Martin (referee) ; Hrubeš, Jan (advisor)
Transformation of ECG The aim of this work is to get acquainted with the means of transformation of ECG, and to execute Dower transform and evaluate it’s efficiency. Then, to design and realize a new way of forward and reverse transformation of ECG in MATLAB program for the purpose of data compression, and to evaluate its functionality with signals from CSE database.
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