audio-dsp-engineering

Pick the right audio-DSP architecture for a described product by traversing the audio-DSP architecture decision tree (latency tolerance → processing model → time-vs-frequency domain → fixed-vs-float + denormals → platform/plugin format + audio I/O), then return the recommended processing model, latency & buffer-size budget, sample rate/bit depth, numeric strategy, algorithm approach (IIR/FIR/FFT-STFT, oversampling), framework + plugin format + audio backend, and the conditions that would flip the choice. Reach for this when the user asks "block or sample-by-sample?", "what latency/buffer size?", "JUCE + VST3/AU/CLAP or Web Audio?", "fixed-point or float?", or "IIR biquad vs FIR vs FFT for this effect?". Used by `audio-dsp-architect` (primary).

From an effect or product goal and its architecture, derive the signal-processing chain — the block diagram (stage order), the per-stage algorithm (IIR biquad / FIR / FFT-STFT / delay / dynamics), the per-stage and total latency, the sample rate and gain-staging/headroom, the oversampling plan for any nonlinearity, and the parameter list with smoothing needs — captured in the DSP design spec. Reach for this when the user asks "design the effect chain for this", "what order should these processors go in?", or "map out the DSP stages and their latency". Used by `dsp-implementation-engineer` and `audio-dsp-architect`.

Implement a DSP stage as real-time-safe code in the audio callback (no locks, no allocation, no syscalls, no unbounded work — everything pre-allocated at prepare time), handle denormals with flush-to-zero, pass parameters lock-free (atomic / SPSC FIFO) with per-sample smoothing, then optimize the profiled hot loop with SIMD (SSE/AVX/NEON/CMSIS-DSP) and verify with objective measurement (null test, THD+N, impulse/frequency response, RT-safety audit). Reach for this when the user asks "write the real-time-safe processBlock", "optimize this hot loop", "pass params without a data race", or "null-test / measure this effect". Used by `dsp-implementation-engineer` (primary).