973455b158
Header-only, heap-free, sample-rate-aware DSP primitives for stream 3: - Biquad (LPF/HPF/BPF/Notch/Peak/LowShelf/HighShelf, denormal flush) - Delay<N> + DynamicDelay<N> (fixed-length feedback + power-of-two ring with fractional read & smoothed offset) - AllPass / Comb / LpComb (Schroeder-Moorer reverb sections, split per role rather than maximilian's one-class-many-roles maxiReverbFilters) - DCBlocker (one-pole HPF) - ChamberlinSVF + OnePoleSmoother<NCh> + EnvelopeFollower - ADSR envelope generator - SineOsc/SawOsc/SquareOsc, PAFOperator (port of maxiPAFOperator with static gauss/cauchy tables), FMOp single-operator FM building block - PitchShifter<N> granular two-head crossfade (replaces daisysp PitchShifter) Tests: biquad freq-domain attenuation, delay tap timing, reverb boundedness, pitch-shifter ratio + finite output. All pass under -Wall -Wextra -Werror -Wpedantic, C++20.
34 lines
691 B
C++
34 lines
691 B
C++
// nisps/dsp/dc_blocker.hpp — first-order high-pass to remove DC.
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//
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// y[n] = x[n] - x[n-1] + R * y[n-1]
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//
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// `R` close to 1 (typical 0.99) gives a very low-frequency cut. This is the
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// straight port of maximilian's `maxiDCBlocker`.
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#pragma once
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#include "../core/perf.hpp"
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namespace nisps {
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class DCBlocker {
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public:
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DCBlocker() noexcept = default;
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NISPS_HOT NISPS_FORCE_INLINE float play(float input, float r) noexcept {
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ym1_ = input - xm1_ + r * ym1_;
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xm1_ = input;
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return ym1_;
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}
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void reset() noexcept {
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xm1_ = 0.f;
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ym1_ = 0.f;
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}
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private:
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float xm1_ = 0.f;
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float ym1_ = 0.f;
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};
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} // namespace nisps
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