IIR Filters . Biquad and arbitrary order. Parametric Filters . Classic filter shapes. Integral Delays .
Simple delay opcodes.
Fractional Delays . Also introduces oparrays. In this chapter, we describe the core opcodes for audio filters. Most opcodes in this chapter are normative, and compute filters that sound identical on any compliant decoder. A few opcodes are non-normative, and are provided as convenient tools for algorithm prototyping.