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Measured impulse response analyzer

· Last updated：2026-10-23

Analyze an existing measured IR with broadband Schroeder decay, EDT/T20/T30 fits, C50/C80 and D50.

Details

What this tool helps you do

Upload an already measured/deconvolved IR, not a sweep, MLS excitation, music or speech. Maximum 30 seconds, mono/stereo, 8–96 kHz. Fits require sufficient decay range, tail/noise headroom and R² ≥0.98. EDT (0 to −10 dB), T20 (−5 to −25 dB), and T30 (−5 to −35 dB) extrapolate a straight-line slope to 60 dB. Times are onset-relative; clarity uses captured energy. Download JSON, CSV, SVG and an offline report. No recording, deconvolution, octave-band analysis or certified room-acoustics RT60 measurement. Conservative completeness check: tail power must fall at least 45 dB below onset-block power, with at least 10 dB fit headroom. Trailing silence or negligible padding is excluded from tail diagnostics; abrupt active-tail drops invalidate fits. This may withhold otherwise usable EDT estimates.

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Written by the Elysia Tools team

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Media
Input types
file
Output type
file
Sample coverage
4
API ready
Yes

Overview

The Measured Impulse Response Analyzer computes broadband Schroeder decay curves, linear reverberation fits (EDT, T20, and T30), and onset-relative acoustic ratios (C50, C80, and D50) from pre-rendered or deconvolved impulse response audio files. Designed for acoustics engineers and audio researchers, it applies strict noise floor and tail headroom checks before generating exportable JSON, CSV, SVG plots, and standalone summary reports.

When to use

  • You have a deconvolved room or chamber impulse response and need objective broadband reverberation times (EDT, T20, T30).
  • You need speech and music clarity parameters (C50, C80, and D50) calculated directly from recorded impulse response files.
  • You want to verify impulse decay quality and ensure measurements meet tail-to-noise headroom thresholds without manual curve fitting.

How it works

  1. 1Upload a measured, already deconvolved impulse response file in WAV, FLAC, or AIFF format (mono or stereo, 8 kHz to 96 kHz, up to 30 seconds).
  2. 2The analyzer detects the impulse onset, computes the backward Schroeder integration, and checks that tail power drops at least 45 dB below onset power with at least 10 dB headroom.
  3. 3Straight-line linear regressions are fitted across standard intervals (EDT: 0 to −10 dB, T20: −5 to −25 dB, T30: −5 to −35 dB) requiring R² ≥ 0.98, alongside C50, C80, and D50 ratios.
  4. 4Download a ZIP package containing structured numerical results in JSON and CSV, vector Schroeder decay plots in SVG, and a self-contained offline report.

Use cases

  • Validating synthetic room impulse responses against simulated exponential decay targets.
  • Benchmarking deconvolved auditorium or studio acoustic measurements for speech clarity (C50) and music articulation (C80).
  • Screening measured impulse response archives for noise floor truncation or corrupted tail artifacts before further DSP processing.

Examples

1. Studio Control Room Measurement Verification

Acoustic Consultant

Background

An acoustic consultant captured room impulse responses across multiple listening positions using an external deconvolution tool and needs verified broadband decay parameters.

Problem

The consultant must quickly verify whether the measurements have sufficient signal-to-noise ratio to yield valid T20 and T30 figures.

How to use

Upload the 24-bit 48 kHz stereo WAV file containing the deconvolved impulse response directly into the analyzer.

Outcome

The tool validates that the tail drops >45 dB below peak, fits EDT at 0.32 s and T20 at 0.35 s with R² > 0.99, and outputs C80 alongside downloadable CSV and SVG decay plots.

2. Synthetic Decay Fixture Validation

DSP Algorithm Developer

Background

An audio programmer is prototyping an algorithmic reverberator and rendering test impulses to verify simulated decay slope accuracy.

Problem

Manual slope estimation in an audio editor is prone to cursor errors and lacks automated R² goodness-of-fit thresholds.

How to use

Upload the rendered 0.8-second exponential decay WAV file to inspect Schroeder integration and regression output.

FAQ

Can I upload raw sine sweeps or MLS recordings directly?

No. The analyzer requires an already deconvolved impulse response file, not an active test sweep, MLS excitation signal, music, or continuous speech.

Why are T20, T30, or EDT reported as unavailable for my file?

Fits require a linear correlation of R² ≥ 0.98, at least 10 dB of fit headroom above the tail, and an uncorrupted decay curve. Incomplete tails or abrupt cuts invalidate regressions.

Does this tool provide fractional octave-band analysis?

No. The tool computes broadband Schroeder decay and broadband clarity metrics across the full audible spectrum of the uploaded audio.

How are C50, C80, and D50 calculated?

They are calculated from the detected arrival onset using captured impulse energy, integrating early-to-late energy ratios at 50 ms and 80 ms boundaries.

What export formats are included in the downloaded archive?

The output archive includes raw decay and fit metrics in JSON and CSV, vector decay graphics in SVG, and an offline HTML summary report.

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Outcome

The analyzer confirms an EDT of 0.80 s and exports a structured JSON payload containing exact Schroeder energy points for regression testing.