Signal Distortion Measurement Device Design
High-precision device achieving 0.5% error with 1kHz-100kHz bandwidth
Project Overview
Institution: University of Science and Technology of China (USTC)
Mentor: Dr. Wei Lu
Duration: April 2021 - November 2021
Key Achievements
- Reduced distortion error to around 0.5% with requirement of 3% and extended measurement bandwidth to 1kHz-100kHz
- Applied window functions to reduce Spectrum Leakage. Considering both effectiveness and feasibility, I chose Hanning window finally
- Designed an algorithm to accurately detect the center spectrum by adding energy from nearby spectrum lines
- Developed an LCD to visualize relevant data and input analog signals
Technical Details
Spectrum Leakage Reduction
The project focused on addressing distortion during sampling, specifically targeting spectrum leakage. By implementing Hanning window functions, we significantly improved measurement accuracy while maintaining practical feasibility.
Center Spectrum Detection
A custom algorithm was developed to enhance spectrum detection accuracy by intelligently aggregating energy from nearby spectrum lines, ensuring precise identification of the center spectrum.
User Interface
An LCD display was integrated to provide real-time visualization of measurement data and analog signal inputs, improving the device’s usability and monitoring capabilities.