Time Domain Filter Bank Architecture

This directory contains the TDFB component.

Overview

Generally used for operations like beamforming or highly directional microphone array processing in the time domain.

Configuration and Scripts

• Kconfig: Manages the Time Domain Fixed Beamformer component (COMP_TDFB), requiring generic COMP_MODULE_ADAPTER integration along with high-precision math packages (MATH_FIR, MATH_IIR_DF1, SQRT_FIXED, CORDIC_FIXED).
• CMakeLists.txt: Builds the standard source set (tdfb.c, tdfb_generic.c, tdfb_hifiep.c, tdfb_hifi3.c, tdfb_direction.c) handling generic and HIFI implementations alongside IPC abstractions (tdfb_ipc3.c, tdfb_ipc4.c). Inherits out-of-tree loader (llext) generation.
• tdfb.toml: Generates ALSA properties mapping the component to UUIDREG_STR_TDFB.
• Topology (.conf): Instantiated from tools/topology/topology2/include/components/tdfb.conf, creating a tdfb widget type effect (UUID 49:17:51:dd:fa:d9:5c:45:b3:a7:13:58:56:93:f1:af). Provides multiple internal mixer controls spanning phase/direction toggles.
• MATLAB Tuning (tune/): sof_example_circular_array.m and similar array topology scripts define spatial setups (e.g., circular, linear, L-shape, rectangular). They take microphone layout coordinates, compute beamforming angles (azimuth/elevation) and delays, and pack them into binary configuration blobs allowing microphones to "steer" their listening direction interactively.