arXiv subjects

D. G. Perera

Publications and source records attributed to D. G. Perera.

7 recordsLinked to original sources

arXiv2026

Monophonic Audio Synthesizer Using FPGAs

Signal synthesis is used in every aspect of the electronics world, where sinusoidal waveforms are used to perform functions such as clocking, signal transmission, feedback controls, and other applications. Digital synthesis is the method of approximating sinusoidal waveforms using digital logic, where the waveform is approximated to an accurate degree at a specific frequency which can be either implemented digitally or converted into the analog domain for use elsewhere. This project details the creation of a digital synthesizer commonly used for professional audio applications through the implementation of hardware in an FPGA.

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arXiv2026

FPGA-Based Mini X-Ray Detector Front-End

Medical imaging systems require reliable front-end electronics that can acquire sensor data, process image information, identify errors, and communicate results to other parts of the system. In applications such as X-ray imaging, CT, PET, ultrasound, and other diagnostic imaging systems, the electronics must often handle large amounts of data while maintaining predictable timing and low-latency operation. Because of these requirements, FPGAs (Field Programmable Gate Arrays) are commonly useful for medical imaging and signal-processing applications. In this project, the medical imaging concept is simplified into a small FPGA-based frontend demonstration.

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arXiv2026

Closed-Loop Environmental Control System on Embedded Systems

In this paper, our objective is to design, build, and verify a closed-loop environmental control system tailored for small-scale agriculture applications. This project aims to develop a low-cost, safety-critical embedded solution using the Nuvoton NUC140 microcontroller to automate temperature regulation. The goal was to mitigate crop yield losses caused by environmental fluctuations in a greenhouse. Our final implemented system successfully meets all design specifications, demonstrating robust temperature regulation through a PID control loop and ensuring hardware safety through galvanic isolation

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arXiv2025

Composing Mini Oscilloscope on Embedded Systems

In this paper, our goal is to reproduce the basic functionalities of a regular oscilloscope, using the Nuvoton NUC-140 embedded systems development platform as the front-end and display method. A custom-built daughter board connects the NUC-140 to a variety of peripherals, including two BNC scope-probe connections, an external nine-button keypad, and a calibration signal. The LCD of the NUC-140 development board serves as the waveform display. From the experimental results, it is demonstrated that our proposed system became a very competent debugging tool. It implements 90% of the features we typically use on original oscilloscopes, including: automatic, edge-triggered, and single modes; waveform visualization using vertical and horizontal scaling; probe calibration.

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arXiv2025

Real-Time Piano Note Frequency Detection Using FPGA and FFT Core

Real-time frequency analysis of musical instruments, such as the piano, is an essential feature in areas like electronic tuners, music visualizers, and live sound monitoring. Traditional methods often rely on software-based digital signal processing (DSP), which may introduce latency and require significant computational power. In contrast, hardware platforms such as FPGAs (Field Programmable Gate Arrays) offer the ability to perform such analyses with greater speed and determinism due to their parallel processing capabilities. The primary objective of this project was to analyze analog audio signals from a digital piano using an FPGA-based real-time Fast Fourier Transform (FFT) system.

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arXiv2025

Design and Implementation of Washing Machine HUD Using FPGAs

In contemporary digital design education, practical field programmable gate array (FPGA) projects are indispensable for bridging theoretical concepts with real-world applications. This project focuses on developing a hardware-based simulation of a domestic washing machine controller using the Xilinx Spartan-3E development board. A critical component of the design is the graphical heads-up display (HUD), which renders real-time information about the machine's operational state and cycle selections via a VGA interface.

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arXiv2025

Spectrum Analysis with the Prime Factor Algorithm on Embedded Systems

This paper details the purpose, difficulties, theory, implementation, and results of developing a Fast Fourier Transform (FFT) using the prime factor algorithm on an embedded system. Many applications analyze the frequency content of signals, which is referred to as spectral analysis. Some of these applications include communication systems, radar systems, control systems, seismology, speech, music, sonar, finance, image processing, and neural networks. For many real-time applications, the speed at which the spectral analysis is performed is crucial. In order to perform spectral analysis, a Fourier transform is employed. For embedded systems, where spectral analysis is done digitally, a discrete Fourier transform (DFT) is employed. The main goal for this project is to develop an FFT for a 36-point DFT on the Nuvoton Nu-LB-NUC140V2. In this case, the prime factor algorithm is utilized to compute a fast DFT.

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