delay-reverb

Reverb effects use delay lines configured with comb filters, Schroeder allpass sections, or Freeverb-inspired feedback networks to simulate room acoustics. You instantiate a delay line, configure damping parameters, and connect feedback paths through these topologies to produce a stable reverb tail.

Fractional delay interpolation achieves sub-sample accuracy using linear, cubic, allpass, or sinc interpolation methods. These options allow smooth delay time modulation and prevent audible artifacts when creating delay-based audio effects like reverb.

Power-of-two circular buffers use bitmask wrapping for fast read and write operations in real-time audio DSP. This ensures efficient memory access and stable performance when implementing delay lines and feedback delay networks.

Feedback Delay Networks (FDN) create dense reverb tails by routing audio through multiple parallel delay lines with a feedback matrix. This topology complements comb and allpass filters to generate complex spatial effects and realistic room ambience.

Comb filters with damping and Schroeder allpass filters support both small room simulations and long ambient tails. Adjusting delay times and damping parameters scales the reverb effect from tight room acoustics to expansive ambient spaces.

Linear and cubic interpolation offer low computational cost for basic real-time reverb, while allpass and sinc options provide higher fidelity for critical delay modulation. Choosing the right fractional delay method ensures stable, artifact-free audio DSP performance.