Fundamentals · Aug 19, 2026 · 7 min read
How to Read a Spectrogram
A clear guide to spectrogram axes, colors, patterns, resolution, and the visual signatures of tones, speech, noise, and transients.
↗The field guide to visible soundAudio analysis,
Audio analysis,
made readable.
Practical, carefully written guides for understanding spectra, spectrograms, FFT resolution, frequency ranges, and digital levels—without unnecessary jargon.
Start here · Aug 21, 2026 · 8 min read
202002k20kHow to Read a Spectrum Analyzer: A Practical Guide
Learn what frequency peaks, dBFS levels, harmonics, noise floors, and frequency scales mean—and how to read them without guessing.
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Eight guides. Zero filler.
Built to answer one real analysis question at a time.
Workflow · Aug 17, 2026 · 6 min read
Spectrum vs. Spectrogram
Compare spectrum and spectrogram views, understand what each reveals, and choose the right visualization for pitch, noise, speech, music, or hidden audio data.
↗Technique · Aug 15, 2026 · 8 min read
FFT Size Explained
Understand FFT bins, frequency resolution, time resolution, window length, and why 2048, 4096, or 8192 produce different audio analysis results.
↗How-to · Aug 13, 2026 · 7 min read
Find the Frequency of a Sound
Measure the dominant frequency of a tone, recording, instrument, hum, or microphone input and avoid common peak-reading mistakes.
↗Exploration · Aug 11, 2026 · 8 min read
Reveal Hidden Spectrogram Images
A careful workflow for finding images, text, symbols, and encoded clues in audio spectrograms without mistaking artifacts for intentional content.
↗Reference · Aug 9, 2026 · 9 min read
Audio Frequency Ranges Explained
Understand the audible frequency spectrum from sub-bass to brilliance and learn what common instruments, voices, noise, and recording problems look like.
↗Reference · Aug 8, 2026 · 8 min read
dBFS, RMS, Peak & Crest Factor
Learn how digital audio level metrics differ, what clipping means, and how to interpret peak level, RMS level, and crest factor together.
↗Put the ideas into practice
Open the analyzerOpen a sound. Find the signal.
Analyze an audio file or microphone input directly in your browser.