CB IR Lab — Sine-sweep deconvolution and harmonic separation

Audio path

not opened

Input device

Output device

Sample rate

Input channels

Processing is disabled on the stream — no echo cancellation, no noise suppression, no auto gain. If your browser overrides that, the readout below will say so.

Round-trip calibration

idle

Chirp level (dBFS)

round trip — samples

= — ms

confidence —

Patch out → device in, device out → in. Run this once per session, at the buffer size you'll capture with. This offset becomes the common zero for every channel and every pass, so relative delay between two mics survives the trim.

Sweep

—

Preset

Start Hz

End Hz

Sweep sec

Tail sec

Level dBFS

IR length sec

Pre-roll ms

End frequency is clamped to Nyquist. Longer sweeps buy signal-to-noise, not bandwidth — go long for quiet reverb tails, stay short for cabs.

Capture

idle

Single pass sends the sweep out both outputs and keeps whatever comes back — right for cabs, mono FX, and two-mic setups on one source. True stereo sweeps left alone, then right alone, and builds the four paths L→L, L→R, R→L, R→R.

peak in — dBFS

noise floor — dBFS

Deconvolution

no capture

Deconvolution timeline — harmonic products, then the linear impulse

harmonic products (discarded) linear impulse (kept) IR window

Linear IR — —

Magnitude response

Show channel

Normalize

Fade out ms

Remove DC

Nonlinearity report

Run a capture to see how much of this unit's sound convolution can't reproduce.

Bit depth

File name

Chrome, Edge or Opera. Serve over https or localhost — microphone access is blocked on plain http.