Audio Signal and Distortion Analyzer

Audio Signal and Distortion Analyzer is a desktop acoustic measurement, calibration tone
generator, and harmonic spectrum workbench for Linux.
A lightweight Linux alternative to RightMark Audio Analyzer for evaluating audio files,
loopback captures, and codec fidelity with precision spectral metrics.

Key Features:
- Precision Calibration WAV Synthesizer: Generates bit-exact 16-bit and 24-bit PCM WAV
calibration signals at 44.1 kHz, 48 kHz, and 96 kHz including 1 kHz reference sine,
60 Hz + 7 kHz SMPTE twin-tone IMD, 20 Hz to 20 kHz logarithmic sweep, white noise,
and dual-channel stereo crosstalk test probes.
- Multi-Format Audio Decoding: Reads uncompressed PCM WAV directly and decodes FLAC, MP3,
Ogg Vorbis, Opus, AAC, and M4A audio files via bundled FFmpeg into floating-point frames.
- Windowed Radix-2 FFT Distortion Metrics: Applies a 4-term Blackman-Harris window with
Welch spectral averaging to compute Total Harmonic Distortion (THD % and dB), THD+N (dB),
Signal-to-Noise Ratio (SNR dB), Dynamic Range, Peak and RMS dBFS, Crest Factor, DC Offset,
and Stereo Crosstalk (dB).
- Harmonic Spectrum Plot & Lab Reports: Renders an interactive logarithmic frequency
spectrum with H1 through H10 harmonic markers and exports HTML, CSV, and JSON lab reports.

Disclaimer: This project is an independent open-source tool and is not affiliated with, sponsored by, or endorsed by RightMark Gathering.