Impulse Response — Measurement & Analysis
The room impulse response captures the complete acoustic fingerprint: direct sound, early reflections, and reverberation. Every ISO 3382 parameter is extracted from this single measurement through Schroeder integration and energy analysis of the time-domain signal.
Contents
Initial peak = direct sound. Early reflections within 50-80 ms as discrete peaks. Late reverberation decays exponentially. Noise floor limits usable dynamic range.
Excitation
Log sine sweep (Farina): best SNR, separates distortion. MLS: fast, sensitive to time-variance. Both per AES-2id.
Deconvolution
Recovers IR by removing excitation. Sweeps: frequency-domain inverse filter. MLS: circular cross-correlation. Both assume linearity and time-invariance.
Parameter Extraction
Schroeder backward integration produces EDC. RT60 via linear regression on specified ranges. Energy parameters (C50, C80, D50, Ts) via time-windowed integration per ISO 3382-1.
Quality
INR determines extractable parameters. T20 needs 35 dB, T30 needs 45 dB. Longer sweeps increase INR. Export as 48 kHz / 24-bit WAV.
Try It Now
Capture impulse responses with sweep or MLS