Filter noise — AI Noise Reduction for PipeWire

GTK4/libadwaita configuration window plus a Plasma 6 system-tray applet, both backed by a single ~/.config/biglinux-microphone/settings.json watched via gio::FileMonitor / inotifywait for instant bidirectional sync.

Features

AI noise reduction

• GTCRN neural network — voice-grade denoising via a LADSPA host
• DNS3 & VCTK models (16 kHz) — aggressive or gentle profiles
• DeepFilterNet3 (full-band 48 kHz) — optional backend, exposed in the model dropdown when the deepfilternet-ladspa package is installed; same intensity slider drives its attenuation cap

Audio processing

• Equalizer with presets (Voice Boost, Podcast, Warm, Bright, De-esser, Low-cut)
• Noise gate — silences the chain during silence
• Acoustic echo cancellation — WebRTC AEC, on by default in a standalone pipewire -c instance; optional toggle in the Advanced view

Voice enhancement

• Dual mono — stereo duplication of the cleaned voice
• Radio voice — broadcast-style compression
• Voice changer — pitch slider with Deep / Lower / Natural / Higher / Chipmunk marks

System sound filter

• Cleans every sound the system plays before it reaches the speakers, using the same GTCRN-based chain on the playback side.

Visualization & monitoring

• Spectrum analyzer — 30 bands at 60 fps
• Headphone monitor — hear the processed signal with adjustable delay
• Live parameter updates — param-only changes are pushed via pw-cli; topology changes reload only the affected chain

User experience

• Smart-filter routing — filter.smart = true, no virtual device juggling
• Plasma 6 applet — toggle both filters from the system tray with bidirectional sync against the GTK window
• Persistent settings — serde-backed JSON, atomic writes

Requirements

Runtime

• Linux with PipeWire >= 1.4 + WirePlumber >= 0.5
• GTK4 >= 4.20 and libadwaita >= 1.8
• gtcrn-ladspa (neural denoiser plugin — GTCRN backend)
• swh-plugins (gate, compressor, pitch shifter)
• deepfilternet-ladspa (optional) — enables the DeepFilterNet3 full-band 48 kHz backend in the model dropdown

Build (from source)

• Rust >= 1.82 (rustup recommended)
• pkg-config, clang, pipewire-devel, gtk4-devel, libadwaita-devel

License for our configuration interface

GNU General Public License v3.0 - see LICENSE for details.

Acknowledgments

• GTCRN Project - Neural network for noise reduction
• DeepFilterNet - Full-band neural denoiser (DFN3 backend)
• PipeWire - Modern audio server
• GTK4 / Libadwaita - UI framework