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Stereo equalizer with spectrum analyzer
Náhlík, Ondřej ; Šotner, Roman (referee) ; Kratochvíl, Tomáš (advisor)
This bachelor’s work is focused on design of ten band analog stereo equalizer, which is solved by using an active band-pass filters of 2nd order. Simulated output signal isn‘t rippled more than ± 1 dB at zero amplification and can be amplified at maximum ca. ± 8 dB. Prototype of equalizer is then built and it’s characteristics are measured. The circuit of an integrated power amplifier working in the class AB is solved in the next part of this work. Amplifier is then built and it’s characteristics are measured. In the last part of this work, there is described function of a spectral analyzer which is then designed, built and programmed. The analyzer uses the Fast Fourier transform (FFT) and resulting spectrum is displayed on a display.
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Audio mixing desk
Čapka, Jiří ; Brtník, Bohumil (referee) ; Šotner, Roman (advisor)
The main content of this masters’s thesis is designing of an audio mixing desk and simulation of individual components in software OrCAD. The most important parts of the device are input preamplifiers for dynamic, electret and condenser microphones, stereo unbalanced inputs and balanced line level preamplifiers, equalization circuits and LED level indicators of individual channels, headphone listening circuit, 10-band equalizer, audio spectrum analyzer, circuits with balanced signal for main outputs and power supply circuits.
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Switch stereo low frequency signals
Lukesle, Václav ; Jankovský, Jaroslav (referee) ; Hejátková, Edita (advisor)
The work proposes steps for fabricating low-frequency preamplifier including switchable inputs and the output equalizer. In the beginning of the thesis theoretical principles of amplifying the low-frequency signals are introduced. For setting the resonance frequency of equalizer the gyrator filter has been used. By setting the aforementioned frequency and tuning the potentiometer we are able to change the quality factor as well as the gain of the entire circuit. Benefit of this work is a large flexibility for tuning the output signal including a possibility of selection of four various inputs. Simulation and measurement results, PCB and a summary of discrete components are finally attached.
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Equalization Methods in Digital Communication Systems
Deyneka, Alexander ; Šilhavý, Pavel (referee) ; Číž, Radim (advisor)
Tato práce je psaná v angličtině a je zaměřená na problematiku ekvalizace v digitálních komunikačních systémech. Teoretická část zahrnuje stručné pozorování různých způsobů návrhu ekvalizérů. Praktická část se zabývá implementací nejčastěji používaných ekvalizérů a s jejich adaptačními algoritmy. Cílem praktické části je porovnat jejich charakteristiky a odhalit činitele, které ovlivňují kvalitu ekvalizace. V rámci problematiky ekvalizace jsou prozkoumány tři typy ekvalizérů. Lineární ekvalizér, ekvalizér se zpětnou vazbou a ML (Maximum likelihood) ekvalizér. Každý ekvalizér byl testován na modelu, který simuloval reálnou přenosovou soustavu s komplexním zkreslením, která je složena z útlumu, mezisymbolové interference a aditivního šumu. Na základě implenentace byli určeny charakteristiky ekvalizérů a stanoveno že optimální výkon má ML ekvalizér. Adaptační algoritmy hrají významnou roli ve výkonnosti všech zmíněných ekvalizérů. V práci je nastudována skupina stochastických algoritmů jako algoritmus nejmenších čtverců(LMS), Normalizovaný LMS, Variable step-size LMS a algoritmus RLS jako zástupce deterministického přístupu. Bylo zjištěno, že RLS konverguje mnohem rychleji, než algoritmy založené na LMS. Byly nastudovány činitele, které ovlivnili výkon popisovaných algoritmů. Jedním z důležitých činitelů, který ovlivňuje rychlost konvergence a stabilitu algoritmů LMS je parametr velikosti kroku. Dalším velmi důležitým faktorem je výběr trénovací sekvence. Bylo zjištěno, že velkou nevýhodou algoritmů založených na LMS v porovnání s RLS algoritmy je, že kvalita ekvalizace je velmi závislá na spektrální výkonové hustotě a a trénovací sekvenci.
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Vacuum tube phono amplifier
Hrubý, Ondřej ; Novák, Lukáš (referee) ; Musil, Tomáš (advisor)
This master´s thesis deals with a design and simulation of an audio power phono amplifier using vakuum tubes. The frequency response of suggested solution should comply with the norm specified by RIAA. It also describes a vacuum tube basic description and also its advantages for audio applications and principle of usage a magnetodynamic pick-up. Last part contains a design of microprocessor system and power supply.
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Design of bass guitar preamplifier
Müller, Radek ; Tošovský, Petr (referee) ; Brančík, Lubomír (advisor)
This thesis deals with analog bass guitar preamplifiers and related functional blocks such as equalizers and bass effects. The first part contains a theoretical analysis of individual functional blocks preamplifiers and principles as well as an outline of the design and construction principles. In the following section is presented a design of connection that involves a bass guitar preamplifier, including an equalizer, an integrated distortion effect and an amplifier for headphone output. The proposed connections are simulated in the PSpice program and the printed circuit boards design is carried out using the Eagle program. Based on previous results, the construction of a bass guitar preamplifier is realized. The parameters of the individual blocks are measured and compared with the simulations.
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Audio equalizer implementation based on FPGA structure
Otisk, Libor ; Valach, Soběslav (referee) ; Kváš, Marek (advisor)
The bachelor thesis introduces the basic types of audio equalizers. It describes the design of digital filters for graphic equalizer, the correct choice of structure, placement and shape of digital filters. It also describes the implementation of graphic equalizer in the fixed-point arithmetic. It further describes an implementation of the algorithm graphic equalizer on PC and the implementation in gate array of FPGA.
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D class audio-amplifier with digital and remote control
Petrgál, Filip ; Kovář, Jan (referee) ; Šotner, Roman (advisor)
The contents of this thesis is design of audio power amplifier in Class D with fully digital control and remote control and is divided into two parts . The first part is devoted to the basic principles and theory of key elements of the entire amplifier. The second part consists of a complete description of the design and construction of a power amplifier, digital control with remote control, a spectrum analyzer, equalizer, preamp VU meters and complete power supply. Each proposal contains a detailed analysis of the solutions supported by simulations and software. For individual parts have been completely measured p arameters.
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Equalization of the transmission channel
Žlebek, Lukáš ; Šilhavý, Pavel (referee) ; Číž, Radim (advisor)
This thesis describes a design of a simulation of transmission of digital information via communication system and equalization of communication function. The layout of communication channel with multiway transmission is described in following part. Next part is about hardware modulator which generate modulated signal which is transmitted via communication channel and after is sampled by A/D convertion card to computer, where is equalizated and demodulated in Simulink. In the last part of this thesis, there is proposal of the laboratory task and its sample solution.
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