JYA Acoustic Lab

Sound Effects, STC & Rw Ratings calculation

Generate colored noise live spectrum, and calculate single-number ratings (Rw & STC) from frequency band data.

ISO 717-1 · ASTM E413 • Interactive

Panel One

Noise generator & spectrum

Spectrum is computed from the current output using the Web Audio API analyser node.

Panel Four

Sound pitch & volume

Adjust frequency and level, choose a waveform, and listen to the generated tone.

Waveform: sine
Frequency: 440 Hz | Volume: 30%
Hz
lin

Panel Two

ISO 717-1 rating (Rw) with STL chart

Enter STL values at the ISO band frequencies; see the contour overlay chart.

Result: —

The contour shifts until ∑ deficiencies ≤ 32 dB and no single deficiency exceeds 8 dB.

Result

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Panel Three

ASTM E413 rating (STC) with STL chart

Enter STL values at the ASTM band frequencies; see the contour overlay chart.

Result: —

Uses ASTM E413 contour (125–4000 Hz) with ∑ deficiencies ≤ 32 dB and single ≤ 8 dB.

Result

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