THD Calculator for Arbitrary Waveforms

This versatile tool provides convenient calculation of Total Harmonic Distortion (THD) for arbitrary input waveforms. The implementation typically involves Fast Fourier Transform (FFT) algorithms to decompose the waveform into its frequency components. Beyond the input waveform data, users can adjust several key parameters: fundamental frequency, sampling rate, and quantization bits to achieve more precise results. The tool incorporates harmonic detection algorithms that identify harmonic components relative to the fundamental frequency. Additionally, the application generates comprehensive visual outputs including frequency spectrum analysis plots and time-domain waveform graphs, implemented using signal processing libraries. These visualizations help users better understand the computational results and waveform characteristics. The underlying code typically includes functions for signal preprocessing, FFT computation, harmonic magnitude extraction, and THD percentage calculation using the standard formula THD = √(∑(harmonic amplitudes²)) / fundamental amplitude × 100%. This practical tool benefits engineers, students, and researchers working with signal analysis, audio processing, or power quality assessment.