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chorus a bit more like the real thing

This commit is contained in:
Gordon JC Pearce 2026-01-05 23:08:50 +00:00
parent ffe4026b18
commit 8c2263c129
2 changed files with 13 additions and 11 deletions
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22
plugin/chorus.cpp
View File

@ -19,9 +19,8 @@
#include "chorus.hpp" #include "chorus.hpp"
#include <math.h> #include <math.h>
#include <string.h>
#include <stdio.h> #include <stdio.h>
#include <string.h>
Chorus::Chorus() { Chorus::Chorus() {
lpfOut1 = new float[bufferSize]; lpfOut1 = new float[bufferSize];
lpfOut2 = new float[bufferSize]; lpfOut2 = new float[bufferSize];
@ -30,7 +29,8 @@ Chorus::Chorus() {
lfoPhase = 1; lfoPhase = 1;
lfoSpeed = 6.283 * 10.7 / sampleRate; // plainly silly value to show if it hasn't been set lfoSpeed = 6.283 * 10.7 / sampleRate; // plainly silly value to show if it hasn't been set
gainTC = 1 - exp(-6.283 * 10 / sampleRate); gainTC = 1 - exp(-6.283 * 10 / sampleRate); // 1/10th of a second declick
bbdTC = 1 - exp(-6.283 * 30 / sampleRate); // hpf into BBD at 159Hz
// not quite Butterworth but you'd never hear the difference // not quite Butterworth but you'd never hear the difference
// these are calculated from the real-world component values // these are calculated from the real-world component values
@ -76,11 +76,14 @@ void Chorus::run(float* input, float** outputs, uint32_t frames) {
hpDelay = flt; hpDelay = flt;
input[i] += (flt * hpGain); input[i] += (flt * hpGain);
ram[delayptr] = input[i]; flt = ((input[i] - bbdRC) * bbdTC) + bbdRC;
bbdRC = flt;
ram[delayptr] = input[i] - flt;
// delays in milliseconds // delays in milliseconds
#define BASE 0.005 #define BASE 0.0035
#define AMT 0.00175 #define AMT 0.002
dly1 = (BASE + (AMT * lfoPhase)) * sampleRate; dly1 = (BASE + (AMT * lfoPhase)) * sampleRate;
delay = (int)dly1; delay = (int)dly1;
@ -103,8 +106,6 @@ void Chorus::run(float* input, float** outputs, uint32_t frames) {
delayptr++; delayptr++;
delayptr &= 0x3ff; delayptr &= 0x3ff;
} }
//printf("dly1 = %f\n", dly1);
postFilter1l->runSVF(lpfOut1, lpfOut1, frames); postFilter1l->runSVF(lpfOut1, lpfOut1, frames);
postFilter2l->runSVF(lpfOut1, lpfOut1, frames); postFilter2l->runSVF(lpfOut1, lpfOut1, frames);
postFilter1r->runSVF(lpfOut2, lpfOut2, frames); postFilter1r->runSVF(lpfOut2, lpfOut2, frames);
@ -113,7 +114,6 @@ void Chorus::run(float* input, float** outputs, uint32_t frames) {
for (uint32_t i = 0; i < frames; i++) { for (uint32_t i = 0; i < frames; i++) {
float y = input[i]; float y = input[i];
gainRC = (gain - gainRC) * gainTC + gainRC; gainRC = (gain - gainRC) * gainTC + gainRC;
outputs[0][i] = y + (gainRC * lpfOut1[i]); outputs[0][i] = y + (gainRC * lpfOut1[i]);
outputs[1][i] = y + (gainRC * lpfOut2[i]); outputs[1][i] = y + (gainRC * lpfOut2[i]);
} }
@ -154,11 +154,11 @@ void Chorus::setChorus(uint8_t mode) {
break; break;
case 0x40: case 0x40:
gain = 1.2; gain = 1.2;
lfoSpeed = 6.283 * 0.3 / sampleRate; lfoSpeed = 6.283 * 0.525 / sampleRate / 2;
break; break;
case 0x00: case 0x00:
gain = 1.2; gain = 1.2;
lfoSpeed = 6.283 * 0.5 / sampleRate; lfoSpeed = 6.283 * 0.85 / sampleRate / 2;
break; break;
} }
} }

2
plugin/chorus.hpp
View File

@ -46,6 +46,8 @@ class Chorus {
float gainRC = 0; float gainRC = 0;
float gainTC = 0; float gainTC = 0;
float bbdRC=0, bbdTC=0;
uint16_t delayptr = 0; uint16_t delayptr = 0;