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Spectrum analyzer based on ASIC
Eliáš, Josef ; Dvořák, Vojtěch (referee) ; Pristach, Marián (advisor)
This term project is focused on a design of spectral analyzer based on fast Fourier transform. There is sigma-delta analog to digital converter realized on Department of Microelectronics as ASIC. FFT was implemented into Spartan S3 board kit. This kit is based on FPGA from Xilinx Company that provides various optimized components for his FPGA. Depending on this component was created FFT 10th order in 10 bit resolution. Results are displayed on VGA monitor.
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Music based electronic light effect
Grygar, Josef ; Staněk, Miroslav (referee) ; Šotner, Roman (advisor)
This work is focused on music baset light effect, it´s principles and possibilities of realization. Music based light effect can affect our perception of reproduced music. This work include design and realization of spectral analyzer, anti-aliasing filter and output power parts. Spectral analyzer uses Fast Fourier transform (FFT) to count resulting spectrum, which is displayed on LED bargrafs. In the theoretical part the priciples of analog to digital conversion are closer described. According to this information, selection of suitable microcontroller is discused.
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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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Control Software for Analyzer HP 89410A
Cacek, Jan ; Čejka, Miloslav (referee) ; Keprt, Jiří (advisor)
Bachelor's thesis is bent on creation control software for spectral analyzer HP 89410A. The first part offers overview capabilities of the analyzer and principle communication over the GPIB, second part serves to presentation to the problems graphical programming method and either as manual to control software with explanation of meaning individual entries. At last third part is introduced example of validation measure for check functionality software.
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HP89410A User Interface
Neužil, Jan ; Caha, Luděk (referee) ; Beneš, Petr (advisor)
The aim of this thesis was to develop user interface in LabVIEW to make typical measurements with spectral analyzer HP89410A There is introduced the theory of operation of an analogue heterodyne and a digital FFT spectral analyzer. It is explained the background of the Fast Fourier Transform. There are discussed the key settings in measuring with FTT analyzer, like window function, bandwidth, number of frequency points, or the averaging. Further is described the program, which was developed for measuring frequency characteristic by white noise and by stepped measurement. It was also made a module for measuring Signal to Noise Ratio and module for Total Harmonic Distortion. In the last part of this thesis are shown the results of processed exemplar measurements.
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