Single-channel biquadratic filters

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 1 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.

Topics

Biquadratic filter essentials

• Applying biquadratic filters to a music loop
• Creating an audio unit extension using the vDSP library

Creating a single-channel biquadratic filter setup

• vDSP_biquad_Setup
• vDSP_biquad_SetupD

See Also

Vector filtering

• Biquadratic IIR filters
• Multichannel biquadratic filters
• Finite impulse response filters
• Recursive filters