Your speakers play the music. Your room leaves its mark. Bass builds up. Some notes linger. Others disappear at the listening seat.
DecayCore helps you measure what is happening and build FIR correction filters for your system. Measure your room, choose a target, and export filters ready to load into your DSP. The packaged app brings measurement and filter generation together in one workflow, free for non-commercial use.
Download DecayCore · Getting started · Documentation
A deep dip in a measurement can tempt you to turn up the gain. Room acoustics rarely makes it that simple.
DecayCore puts controlled cuts first. It keeps correction within defined frequency bands and allows limited boost only where the measurement supports it. Deep nulls and uncertain regions are guarded against excessive correction.
You can use automatic target optimization in the packaged app or take control with Basic and Advanced manual filtering. Linear Phase, Minimum Phase, Mixed Phase and Asymmetric FIR filters let you choose an approach for your system. Phase-aware correction and Temporal Decay Control add tools for addressing timing and low-frequency decay.
- Measure your room. Use the built-in measurement workflow in the packaged release. Compatible REW-style measurement data can also be used.
- Build your correction. Choose your target and filter settings, then generate FIR filters from your measurements.
- Load the filters and listen. Export convolution-ready WAV files for CamillaDSP, Roon convolution, Equalizer APO, MiniDSP, or another FIR-capable DSP engine.
The app runs locally on your computer, with controls in your web browser. No cloud service is involved.
The packaged release includes integrated measurement and the native Rust Automatic mode decision engine. Download it from GitHub Releases for the complete workflow.
The public source is frozen at version 1.2.5. It is source-available for non-commercial use and provides filter generation with Basic and Advanced manual controls. Releases after 1.2.5 are built from a private repository. Their source code is not published, and they are proprietary software that is free for non-commercial use under the license included in each download. The measurement engine, automatic-mode decision engine, and related packaged workflows are not included in the public source tree. See the source repository and the license terms below.
DecayCore was formerly called CamillaFIR. The name changed to avoid confusion with CamillaDSP; full CamillaDSP compatibility remains.
Ready to hear what correction can do in your room?
Download the packaged app and follow the getting started guide.
Questions, feedback, or something that could work better? Write to vilho.valittu@gmail.com.
All DecayCore versions released and documented in this repository are based on Python 3.12.3.
The main source environment currently documented by requirements.txt uses these pinned package versions:
numpy==2.4.6scipy==1.17.1nicegui==3.13.0plotly==6.8.0
numbawas removed in v1.1.6. Public source builds may optionally compile thedecaycore-dspRust extension for faster manual filtering. Automatic mode uses a separate native decision engine that is available only in packaged releases; source builds provide the full Basic and Advanced manual-filtering workflow. See the Installation guide for steps.
The source code in this repository, frozen at version 1.2.5, is source-available for personal, educational, research, and other non-commercial use under the terms of the LICENSE file.
Releases after 1.2.5 are built from a private repository. They are proprietary software, free for non-commercial use under the license included in each download.
The measurement engine, automatic-mode decision engine, and related packaged workflows are not included in this repository and remain proprietary.
Commercial use, integration into commercial audio/DSP products, hosted services, paid filtering services, or paid measurement/calibration workflows requires separate written permission.