Filter a multichannel signal with a cascade of biquadratic sections.
Overview
The vDSP library implements biquadratic filtering as a cascade of individual infinite impulse response (IIR) filters called sections. Each section has its own set of feedback and feedforward coefficients, and implements a direct-form 2 filter.
When the biquadratic filter function executes, the sections execute in sequence. Each section processes the entire input signal and passes its output to the next section for further processing.