Skip to main content
Audio Deconvolve (IR)

Audio Deconvolve (IR) · screenshot coming soon

​
What this node does

Audio Deconvolve (IR) takes a recording of an exponential sine sweep (an ESS played through a space or device) and deconvolves it against the ideal sweep to extract the impulse response (IR). That IR captures the reverb, coloration, and filtering of whatever the sweep passed through, and can then drive convolution reverb. It takes the recorded sweep as a COMFYTV_AUDIO snapshot (or a COMFYTV_VIDEO, whose audio track is used) and outputs the extracted COMFYTV_AUDIO impulse response. It has a ▶ Run. A source is required. To feed native ComfyUI AUDIO in or out, insert a Bridge — see bridges.md.

​
When to use it

  • Capture a real hall/room reverb: play Audio Sweep (ESS), record it in the space, then deconvolve here to get the IR.
  • Profile a guitar cabinet or hardware processor into an IR for later convolution.

​
Parameters

The sweep parameters must match the sweep you played so the deconvolution inverts the correct signal:

​
duration_s

Sweep length in seconds, 1–30 (default 5.0). Must match the played sweep’s duration.

​
fmin

Start (lowest) frequency in Hz, 10–1000 (default 20).

​
fmax

End (highest) frequency in Hz, 1000–20000 (default 20000).

​
amp

Sweep amplitude used in the reference, 0.01–1.0 (default 0.5).

​
ir_len_s

Length of the impulse response to keep, in seconds, 0.1–10 (default 2.0). Long enough to include the full reverb tail; trim to avoid capturing extra noise.

​
Outputs

​
Tips

  • The four sweep parameters here must mirror what you set in Audio Sweep (ESS); a mismatch produces a smeared or wrong IR.
  • Set ir_len_s to cover the reverb tail — too short truncates the decay, too long picks up room noise.
  • Feed the resulting IR straight into Audio Convolve (IR) to reuse the captured space.
  • Audio Sweep (ESS) — generates the sweep you play to capture the response.
  • Audio Convolve (IR) — applies the extracted IR to any source.
  • Muse Reverb (FDN) — algorithmic reverb when you have no space to capture.