Flagship Laboratory 01

The Sonograph

Drop in an eligible sound and expose its inner physical structure: Waveform (amplitude through time), Spectrogram (frequency × time × amplitude), Harmonics (fundamental + overtones), Transients, and Loudness. Then audition isolated frequency bands (20–200 Hz, 2–5 kHz, 10 kHz+) in real time.

Flagship InstrumentWeb Audio Synthesis & Real-Time FFT

The Sonograph

50%

ENGINE STANDBYf0: 440 HzFILTER: FULL

Audition EQ Band:

Or Choose Canonical Preset:

Acoustic Feature TelemetrySource: SINE

Concert Pitch A4 (440 Hz Pure Sine)

Pure sinusoidal acoustic tone with zero harmonic distortion or overtone energy.

Spectral Decomposition:

Single spectral spike at f0 = 440 Hz; 0% harmonic distortion.

Toggle EQ bands above to isolate specific spectral frequency components.Web Audio 32-bit Float

Physical Acoustics Lab2D Resonant Plate Modal Dispersion

The Chladni Nodal Plate

NODAL LINES (w = 0)

Eigenmode Parameters

Mode (2, 3) Resonant Frequency: 234 Hz

m=2, n=3

Modal Index M (Transverse X):2

Modal Index N (Longitudinal Y):3

Coupling Ratio (a / b):1.0

Lutherie & Violin Plate Tuning

Master violin makers (Cremonese masters and modern acousticians like Carleen Hutchins) sprinkle sand or glitter across free spruce plates and excite them with a violin bow. Tuning the spruce soundboard involves scraping wood until Mode 2 (the hourglass pattern at ~180 Hz) and Mode 5 (the ring mode at ~360 Hz) hit exact octave alignments.

Equation: w(x,y) = sin(nπx)sin(mπy) - b·sin(mπx)sin(nπy) = 0Acoustic Sand Physics