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Fix Spectral Compressor high frequency rolloff

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This commit is contained in:
Robbert van der Helm 2022-09-15 01:39:16 +02:00
parent 5ac9c32c19
commit a51c359c0b
1 changed files with 2 additions and 1 deletions
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3
plugins/spectral_compressor/src/compressor_bank.rs
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@ -33,6 +33,7 @@ const ENVELOPE_INIT_VALUE: f32 = std::f32::consts::FRAC_1_SQRT_2 / 8.0;
/// The target frequency for the high frequency ratio rolloff. This is fixed to prevent Spectral
/// Compressor from getting brighter as the sample rate increases.
const HIGH_FREQ_RATIO_ROLLOFF_FREQUENCY: f32 = 22_050.0;
const HIGH_FREQ_RATIO_ROLLOFF_FREQUENCY_LOG2: f32 = 14.428_491;
/// A bank of compressors so each FFT bin can be compressed individually. The vectors in this struct
/// will have a capacity of `MAX_WINDOW_SIZE / 2 + 1` and a size that matches the current complex
@ -982,7 +983,7 @@ impl CompressorBank {
.iter()
.zip(self.upwards_ratio_recips.iter_mut())
{
let octave_fraction = log2_freq / HIGH_FREQ_RATIO_ROLLOFF_FREQUENCY;
let octave_fraction = log2_freq / HIGH_FREQ_RATIO_ROLLOFF_FREQUENCY_LOG2;
let rolloff_t = octave_fraction * upwards_high_freq_ratio_rolloff;
*ratio = (target_ratio_recip * (1.0 - rolloff_t)) + rolloff_t;
}