Pop/Click Noises on Flange.Voices update

[james2k2]

Hi All,

I have searched the forums, but can't find a solution to my problem.

I'm attempting to add a ramped increase/decrease to a flange effect on the delayRate whereby if a button is held down, it increases and when released decreases. Apologies for the poor code below but before that, here's the things I've tried so far:
- Adjust the envelope parameters
- increase AudioMemory
- Use a mixer with 2 flange inputs and switch between them with a delay on update

Unfortunately each time I call flange1.voices I get an unwanted pop/click type noise. I've also got it so it only calls this update if there's a new value. Any help would be much appreciated. Thank you!

#include <JC_Button.h>
#include <elapsedMillis.h>
#include <Ramp.h>

#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <SerialFlash.h>

// GUItool: begin automatically generated code
AudioSynthWaveformSine   sine1;          //xy=248,248
AudioEffectEnvelope      envelope1;      //xy=424,249
AudioEffectFlange        flange1;        //xy=574,264
AudioOutputI2S           i2s1;           //xy=730,328
AudioConnection          patchCord1(sine1, envelope1);
AudioConnection          patchCord2(envelope1, flange1);
AudioConnection          patchCord3(flange1, 0, i2s1, 0);

// GUItool: end automatically generated code

// Accel Counter
elapsedMillis accel_count;

// Flange settings
#define FLANGE_DELAY_LENGTH (6*AUDIO_BLOCK_SAMPLES)
int s_idx = FLANGE_DELAY_LENGTH/4;
int s_depth = FLANGE_DELAY_LENGTH/6;
double s_freq = 5;
short l_delayline[FLANGE_DELAY_LENGTH];
short r_delayline[FLANGE_DELAY_LENGTH];

AudioControlSGTL5000 audioShield;

rampInt myRamp;
Button myBtn(1);
double new_freq;

void setup() {
  myBtn.begin();
  
  AudioMemory(12);

  // Enable the audio shield and set the output volume.
  audioShield.enable();
  audioShield.volume(1);

  sine1.frequency(55);
  sine1.amplitude(0.5);

  flange1.begin(l_delayline, FLANGE_DELAY_LENGTH, s_idx, s_depth, s_freq);

  //envelope1.attack(20);    // 20ms
  //envelope1.hold(0);      // 10ms
  
  envelope1.noteOn();

  myRamp.go(5, 0);
  
}

void loop () {
  myBtn.read();
  
  if (myBtn.wasPressed()) {
    myRamp.go(35,3000);
  }

  if (myBtn.wasReleased()) {
    myRamp.go(5, 3000);
  }

  if (accel_count > 100) {
    if (s_freq != myRamp.update()) {
      flange1.voices(s_idx, s_depth, myRamp.update());
      s_freq = myRamp.update();
    }
    accel_count = 0;
  }
}

 

[james2k2]

Just a quick update. I've since added a ladder filter and this has effectively worked but I don't feel like simply filtering out the unwanted noise is the correct way.

 

[boxxofrobots]

You need to set up two flange objects and fade between them with like a 1mS ramp on each. Update one with new settings and fade to that one, back and forth. Works quite well.