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Allows the low-pass filter to react to high-pass effects.

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This commit is contained in:
Thomas Harte 2021-07-02 22:36:35 -04:00
parent 4fffb3cf19
commit 614953a222
2 changed files with 10 additions and 12 deletions
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20
Machines/Enterprise/Dave.cpp
View File

@ -124,6 +124,8 @@ void Audio::get_samples(std::size_t number_of_samples, int16_t *target) {
}
// Step 2: tick if necessary.
int noise_output = noise_.output & 1;
noise_.output <<= 1;
if(noise_tick) {
switch(noise_.polynomial) {
case Noise::Polynomial::SeventeenBit:
@ -140,20 +142,16 @@ void Audio::get_samples(std::size_t number_of_samples, int16_t *target) {
break;
}
noise_.output <<= 1;
noise_.output |= poly_state_[int(Channel::Distortion::None)];
noise_output = poly_state_[int(Channel::Distortion::None)];
}
noise_.output |= noise_output;
// Low pass: sample channel 2 on downward transitions of the prima facie output.
if(noise_.low_pass) {
if((noise_.output & 3) == 2) {
noise_.output = (noise_.output & ~1) | (channels_[2].output & 1);
} else {
noise_.output = (noise_.output & ~1) | (noise_.output & 1);
}
}
// Low pass: sample channel 2 on downward transitions of the prima facie output.
if(noise_.low_pass && (noise_.output & 3) == 2) {
noise_.output = (noise_.output & ~1) | (channels_[2].output & 1);
}
// Apply noise high-pass at the rate of the tone channels.
// Apply noise high-pass.
if(noise_.high_pass && (channels_[0].output & 3) == 2) {
noise_.output &= ~1;
}

2
Machines/Enterprise/Dave.hpp
View File

@ -86,7 +86,7 @@ class Audio: public Outputs::Speaker::SampleSource {
// Current state.
int count = 0;
int output = false;
int output = 0;
bool final_output = false;
} noise_;
void update_noise();