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26 lines
1.3 KiB
C
26 lines
1.3 KiB
C
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#pragma once
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#include <array>
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namespace FDNReverb {
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// -- Compile-time constants ----------------------------------------------------
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static constexpr int FDN_N = 8; // FDN order (channels; legacy definition kept for reference)
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static constexpr int SAPF_STAGES = 3; // allpass stages per delay line
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static constexpr int ABSO_STAGES = 3; // Stage 1: Jot first-order + LF/HF correction
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static constexpr int ER_TAPS = 16; // early-reflection FIR taps
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// Stage 2 (Valimaki-Liski cumulative GEQ) stages:
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// 10: 10-band GEQ (interaction matrix + WLS)
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//
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// important design notes:
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// - the mid-band gain (midGain) of GEQ band 0 is absorbed into the b0/b1/b2 coefficients;
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// no separate DC gain stage is needed to avoid DC coloration,
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// just a single gain.
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// - LF Absorption / HF Damping are applied directly as GEQ target dB,
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// fully independent of each other.
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// - targets are clamped to 0 dB or below, mathematically guaranteeing loop gain <= 1.
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static constexpr int ABSO_STAGES_S2 = 10;
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// Mutually-prime base delays (samples @ 48 kHz), log-distributed 30-130 ms
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static constexpr std::array<int, FDN_N> BASE_PRIMES_48K = {
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1451, 1693, 1979, 2311, 2683, 3067, 3491, 3923
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};
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} // namespace FDNReverb
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