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About Audio Frequency Analyzer
The Real-Time Audio Frequency Spectrum Analyzer & RTA measures audio frequency energy (20Hz to 20,000Hz) using high-resolution FFT bins, octave band smoothing (1/3rd Octave, 1/6th Octave), Peak Frequency Tracker, and graphic EQ balance meters.
How to Use Audio Frequency Analyzer
Step 1
Upload an audio track or enable live microphone input.
Step 2
Select FFT resolution and octave smoothing mode.
Step 3
Hover over spectrum peaks to inspect exact frequency (Hz), musical note (e.g. A4 440Hz), and amplitude (dBFS).
Step 4
Click "Export Spectrum Snapshot".
Practical Use Cases for Audio Frequency Analyzer
Identifying Problematic Resonant Frequencies for Parametric EQ
Pinpoint harsh vocal sibilance peaks around 6.5kHz or muddy bass buildup around 250Hz for precision EQ attenuation.
Acoustic Room Response & Speaker Calibration Testing
Analyze pink noise playback through studio monitors to measure room frequency response and acoustic node dips.
Input & Output Examples
Analyzing Master Track Frequency Balance
Audio: `mix_master.wav` (FFT Size: `4096`, Smoothing: `1/3 Octave`)
Peak Fundamental: `55.2 Hz` (Kick/Sub) | Tonal Slope: `-4.5 dB/Octave` (Balanced Commercial Target)
Key Features & Performance
- ✓Real-time FFT Spectrum display with 512 to 8192 bin resolution and 60 FPS refresh rate.
- ✓Octave Band Smoothing: None (Raw FFT), 1/3 Octave (Standard Acoustic RTA), 1/6 Octave, 1/12 Octave.
- ✓Frequency Band Breakdowns: Sub-Bass (20-60Hz), Bass (60-250Hz), Low-Mids (250-500Hz), Mids (500-2kHz), High-Mids (2-6kHz), Highs (6-20kHz).
- ✓100% Client-Side Web Audio API.
- ✓1-Click Export Frequency Snapshot PNG.
Key Terminology & Definitions
1/3 Octave Band Smoothing
A standardized acoustic smoothing filter that groups frequencies into 31 ISO standard frequency bands matching human critical ear bandwidths.
Tonal Pink Slope (-4.5 dB/Octave)
The ideal commercial mastering frequency slope where high frequencies naturally roll off relative to bass for a warm, non-fatiguing sound.