You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
44 lines
1.2 KiB
44 lines
1.2 KiB
4 years ago
|
#include "../utility/dsp.h"
|
||
|
|
#include "sampleratereducer.h"
|
||
|
|
#include <math.h>
|
||
|
|
|
||
|
|
using namespace daisysp;
|
||
|
|
void SampleRateReducer::Init()
|
||
|
|
{
|
||
|
|
frequency_ = .2f;
|
||
|
|
phase_ = 0.0f;
|
||
|
|
sample_ = 0.0f;
|
||
|
|
next_sample_ = 0.0f;
|
||
|
|
previous_sample_ = 0.0f;
|
||
|
|
}
|
||
|
|
|
||
|
|
float SampleRateReducer::Process(float in)
|
||
|
|
{
|
||
|
|
float this_sample = next_sample_;
|
||
|
|
next_sample_ = 0.f;
|
||
|
|
phase_ += frequency_;
|
||
|
|
if(phase_ >= 1.0f)
|
||
|
|
{
|
||
|
|
phase_ -= 1.0f;
|
||
|
|
float t = phase_ / frequency_;
|
||
|
|
// t = 0: the transition occurred right at this sample.
|
||
|
|
// t = 1: the transition occurred at the previous sample.
|
||
|
|
// Use linear interpolation to recover the fractional sample.
|
||
|
|
float new_sample
|
||
|
|
= previous_sample_ + (in - previous_sample_) * (1.0f - t);
|
||
|
|
float discontinuity = new_sample - sample_;
|
||
|
|
this_sample += discontinuity * ThisBlepSample(t);
|
||
|
|
next_sample_ = discontinuity * NextBlepSample(t);
|
||
|
|
sample_ = new_sample;
|
||
|
|
}
|
||
|
|
next_sample_ += sample_;
|
||
|
|
previous_sample_ = in;
|
||
|
|
|
||
|
|
return this_sample;
|
||
|
|
}
|
||
|
|
|
||
|
|
void SampleRateReducer::SetFreq(float frequency)
|
||
|
|
{
|
||
|
|
frequency_ = fclamp(frequency, 0.f, 1.f);
|
||
|
|
}
|