This directory contains the Multi-Band Dynamic Range Compressor.

Splits the audio into several discrete frequency bands (e.g., bass, mids, treble) and applies a separate instance of DRC to each band before remixing them.

graph LR
  In[Audio Input] --> Splitter[Band Splitter]
  Splitter --> DRC1[DRC Band 1]
  Splitter --> DRC2[DRC Band 2]
  DRC1 --> Sum[Mixer]
  DRC2 --> Sum
  Sum --> Out[Audio Output]

• Kconfig: Enables the Multiband Dynamic Range Compressor component (COMP_MULTIBAND_DRC). Has explicit dependencies on standard equalizers and filters: COMP_IIR && COMP_CROSSOVER && COMP_DRC.
• CMakeLists.txt: Compiles multiband_drc.c and generic versions, wrapping with IPC specifics (multiband_drc_ipc3.c or multiband_drc_ipc4.c). Supports Zephyr loadable extensions (llext).
• multiband_drc.toml: Defines module topology constraints and mapping (UUID UUIDREG_STR_MULTIBAND_DRC, module type 9).
• Topology (.conf): Derived from tools/topology/topology2/include/components/multiband_drc.conf, configuring the multiband_drc widget object of type effect (UUID 56:22:9f:0d:4f:8e:b3:47:84:48:23:9a:33:4f:11:91). Utilizes an internal switch control for fc.
• MATLAB Tuning (tune/): Features sof_example_multiband_drc.m to generate the complex configuration structures necessary to bind multiple EQs, crossovers, and compressors together. The scripts output the aggregated .m4, binary .bin, and ALSA .txt blobs which define parameter blocks for each individual sub-system active within the multiband processor.