Playing a tone with FIR filter

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R

Racia

Member
Hi there,

I using teensy 3.1 with the audio shield. I'm trying to play a frequency tone with a fir filter. I've tried the examples on FIR filter. However, the example uses audio input which is for microphone for line input. I've tried editing the audio input part to

Code: 
AudioSynthWaveformSine  sine1; 
AudioEffectEnvelope    envelope1;
// Use the fast FIR filter for left and right channels
AudioFilterFIR       myFilterL(true);
AudioFilterFIR       myFilterR(true);
AudioOutputI2S       audioOutput;        // audio shield: headphones & line-out

// Create Audio connections between the components
// Route audio into the left and right filters
AudioConnection c1(audioInput, 0, myFilterL, 0);
AudioConnection c2(audioInput, 1, myFilterR, 0);
// Route the output of the filters to their respective channels
AudioConnection c3(myFilterL, 0, audioOutput, 0);
AudioConnection c4(myFilterR, 0, audioOutput, 1);
AudioControlSGTL5000 audioShield;

But I can't compile it. It shows a few errors:
This report would have more information with
"Show verbose output during compilation"
enabled in File > Preferences.
Arduino: 1.0.6 + Td: 1.20 (Windows NT (unknown)), Board: "Teensy 3.1"
Filter_FIR:49: error: no matching function for call to 'AudioFilterFIR::AudioFilterFIR(int)'
Filter_FIR.ino:49:36: note: candidates are:
In file included from C:\Program Files (x86)\Arduino\libraries\Audio/Audio.h:75:0,
from Filter_FIR.ino:24:
C:\Program Files (x86)\Arduino\libraries\Audio/filter_fir.h:38:2: note: AudioFilterFIR::AudioFilterFIR()
C:\Program Files (x86)\Arduino\libraries\Audio/filter_fir.h:38:2: note: candidate expects 0 arguments, 1 provided
C:\Program Files (x86)\Arduino\libraries\Audio/filter_fir.h:35:7: note: constexpr AudioFilterFIR::AudioFilterFIR(const AudioFilterFIR&)
C:\Program Files (x86)\Arduino\libraries\Audio/filter_fir.h:35:7: note: no known conversion for argument 1 from 'int' to 'const AudioFilterFIR&'
C:\Program Files (x86)\Arduino\libraries\Audio/filter_fir.h:35:7: note: constexpr AudioFilterFIR::AudioFilterFIR(AudioFilterFIR&&)
C:\Program Files (x86)\Arduino\libraries\Audio/filter_fir.h:35:7: note: no known conversion for argument 1 from 'int' to 'AudioFilterFIR&&'
Filter_FIR:50: error: no matching function for call to 'AudioFilterFIR::AudioFilterFIR(int)'
Filter_FIR.ino:50:36: note: candidates are:
In file included from C:\Program Files (x86)\Arduino\libraries\Audio/Audio.h:75:0,
from Filter_FIR.ino:24:
C:\Program Files (x86)\Arduino\libraries\Audio/filter_fir.h:38:2: note: AudioFilterFIR::AudioFilterFIR()
C:\Program Files (x86)\Arduino\libraries\Audio/filter_fir.h:38:2: note: candidate expects 0 arguments, 1 provided
C:\Program Files (x86)\Arduino\libraries\Audio/filter_fir.h:35:7: note: constexpr AudioFilterFIR::AudioFilterFIR(const AudioFilterFIR&)
C:\Program Files (x86)\Arduino\libraries\Audio/filter_fir.h:35:7: note: no known conversion for argument 1 from 'int' to 'const AudioFilterFIR&'
C:\Program Files (x86)\Arduino\libraries\Audio/filter_fir.h:35:7: note: constexpr AudioFilterFIR::AudioFilterFIR(AudioFilterFIR&&)
C:\Program Files (x86)\Arduino\libraries\Audio/filter_fir.h:35:7: note: no known conversion for argument 1 from 'int' to 'AudioFilterFIR&&'

Is there any other ways to input a frequency tone into a FIR filter?
 
I've tried editing some parts. The error message is gone and the program can be compile. But there is no sound output also.

Code: 
/*
c
  - released
b
- Use FIR filters with fast_fft option

The audio board uses the following pins.
 6 - MEMCS
 7 - MOSI
 9 - BCLK
10 - SDCS
11 - MCLK
12 - MISO
13 - RX
14 - SCLK
15 - VOL
18 - SDA
19 - SCL
22 - TX
23 - LRCLK
*/

//#include <arm_math.h>
#include <Audio.h>
#include <Wire.h>
#include <SD.h>
#include <SPI.h>
#include <Bounce.h>
#include "filters.h"

// If this pin is grounded the FIR filter is turned off
// which just passes the audio sraight through
// Don't use any of the pins listed above
#define PASSTHRU_PIN 1
// If this pin goes low the next FIR filter in the list
// is switched in.
#define FILTER_PIN 0

// debounce the passthru and filter switching pins
Bounce b_passthru = Bounce(PASSTHRU_PIN,15);
Bounce b_filter   = Bounce(FILTER_PIN,15);

//const int myInput = AUDIO_INPUT_MIC;
const int myInput = AUDIO_INPUT_LINEIN;

// GUItool: begin automatically generated code
AudioSynthWaveformSine   sine1;          //xy=125,221
//AudioSynthNoisePink      pink1;          //xy=133,121
//AudioEffectEnvelope      envelope1;      //xy=298,133
AudioEffectEnvelope      envelope2;      //xy=302,197
AudioAnalyzeFFT256       fft256_1;       //xy=304,272
AudioMixer4              mixer1;         //xy=486,163
AudioOutputI2S           i2s1;           //xy=640,161
AudioConnection          patchCord1(sine1, envelope2);
AudioConnection          patchCord2(sine1, fft256_1);
//AudioConnection          patchCord3(pink1, envelope1);
//AudioConnection          patchCord4(envelope1, 0, mixer1, 0);
//AudioConnection          patchCord5(envelope2, 0, mixer1, 1);
//AudioConnection          patchCord6(mixer1, 0, i2s1, 0);
//AudioConnection          patchCord7(mixer1, 0, i2s1, 1);
AudioControlSGTL5000     sgtl5000_1;     //xy=517,297
// GUItool: end automatically generated code

AudioFilterFIR      myFilterL;
AudioFilterFIR      myFilterR;
AudioOutputI2S      audioOutput;        // audio shield: headphones & line-out

// Create Audio connections between the components
// Route audio into the left and right filters
AudioConnection c1(sine1, 0, myFilterL, 0);
AudioConnection c2(sine1, 1, myFilterR, 0);
// Route the output of the filters to their respective channels
AudioConnection c3(myFilterL, 0, audioOutput, 0);
AudioConnection c4(myFilterR, 0, audioOutput, 1);
AudioControlSGTL5000 audioShield;


struct fir_filter {
  short *coeffs;
  short num_coeffs;
};

// index of current filter. Start with the low pass.
int fir_idx = 0;
struct fir_filter fir_list[] = {
  {low_pass , 100},    // low pass with cutoff at 1kHz and -60dB at 2kHz
  {band_pass, 100},    // bandpass 1200Hz - 1700Hz
  {NULL,      0}
};


void setup() {
  Serial.begin(9600);
  delay(300);

  pinMode(PASSTHRU_PIN, INPUT_PULLUP);
  pinMode(FILTER_PIN, INPUT_PULLUP);

  // allocate memory for the audio library
  AudioMemory(8);

  audioShield.enable();
  audioShield.inputSelect(myInput);
  audioShield.volume(0.3);
  
  // Warn that the passthru pin is grounded
  if(!digitalRead(PASSTHRU_PIN)) {
    Serial.print("PASSTHRU_PIN (");
    Serial.print(PASSTHRU_PIN);
    Serial.println(") is grounded");
    
   // give the audio library some memory.  We'll be able
  // to see how much it actually uses, which can be used
  // to reduce this to the minimum necessary.
  AudioMemory(20);

  // enable the audio shield
  sgtl5000_1.enable();
  sgtl5000_1.volume(0.1);   
  
  // create a simple bass note using a sine wave
  sine1.frequency(1000);
  sine1.amplitude(0.6);
  envelope2.attack(6.5);
  envelope2.hold(60);
  envelope2.decay(70);
  envelope2.sustain(0);
  
  // add both the note together, so we can hear them
  mixer1.gain(0, 0.5);
  mixer1.gain(1, 0.5);
  }

  // Warn that the filter pin is grounded
  if(!digitalRead(FILTER_PIN)) {
    Serial.print("FILTER_PIN (");
    Serial.print(FILTER_PIN);
    Serial.println(") is grounded");
  }  
  // Initialize the filter
  myFilterL.begin(fir_list[0].coeffs, fir_list[0].num_coeffs);
  myFilterR.begin(fir_list[0].coeffs, fir_list[0].num_coeffs);
  Serial.println("setup done");
}

// index of current filter when passthrough is selected
int old_idx = -1;

// audio volume
int volume = 0;
unsigned long last_time = millis();


int count = 0;
int speed = 60;

void loop()
{
  // Volume control
  int n = analogRead(15);
  if (n != volume) {
    volume = n;
    //uncomment this line if your audio shield has the volume pot
    //audioShield.volume((float)n / 1023);
  }
  
  // update the two buttons
  b_passthru.update();
  b_filter.update();
  
  // If the passthru button is pushed, save the current
  // filter index and then switch the filter to passthru
  if (b_passthru.fallingEdge()) {
    old_idx = fir_idx;
    myFilterL.begin(FIR_PASSTHRU, 0);
    myFilterR.begin(FIR_PASSTHRU, 0);
  }
  
  // If passthru button is released, restore previous filter
  if (b_passthru.risingEdge()) {
    if(old_idx != -1) {
      myFilterL.begin(fir_list[fir_idx].coeffs, fir_list[fir_idx].num_coeffs);
      myFilterR.begin(fir_list[fir_idx].coeffs, fir_list[fir_idx].num_coeffs);
    }
    old_idx = -1;
  }
  
  // switch to next filter in the list
  if (b_filter.fallingEdge()) {
    fir_idx++;
    if (fir_list[fir_idx].num_coeffs == 0) fir_idx = 0;
    myFilterL.begin(fir_list[fir_idx].coeffs, fir_list[fir_idx].num_coeffs);
    myFilterR.begin(fir_list[fir_idx].coeffs, fir_list[fir_idx].num_coeffs);
  }

  // print information about resource usage
  // Proc = 18 (18),  Mem = 4 (5)
  if (millis() - last_time >= 2500) {
    Serial.print("Proc = ");
    Serial.print(AudioProcessorUsage());
    Serial.print(" (");    
    Serial.print(AudioProcessorUsageMax());
    Serial.print("),  Mem = ");
    Serial.print(AudioMemoryUsage());
    Serial.print(" (");    
    Serial.print(AudioMemoryUsageMax());
    Serial.println(")");
    last_time = millis();
  }


}
 
The connections between the envelope and the mixer, and the mixer and the output, are commented out so there will not be any sound.
 
I've edited the part that you mentioned. However, there is still no audio output.

Code: 
#include <Audio.h>
#include <Wire.h>
#include <SD.h>
#include <SPI.h>
#include <Bounce.h>
#include "filters.h"

// If this pin is grounded the FIR filter is turned off
// which just passes the audio sraight through
// Don't use any of the pins listed above
#define PASSTHRU_PIN 1
// If this pin goes low the next FIR filter in the list
// is switched in.
#define FILTER_PIN 0

// debounce the passthru and filter switching pins
Bounce b_passthru = Bounce(PASSTHRU_PIN,15);
Bounce b_filter   = Bounce(FILTER_PIN,15);

//const int myInput = AUDIO_INPUT_MIC;
const int myInput = AUDIO_INPUT_LINEIN;

// GUItool: begin automatically generated code
AudioSynthWaveformSine   sine1;          //xy=125,221
//AudioSynthNoisePink      pink1;          //xy=133,121
//AudioEffectEnvelope      envelope1;      //xy=298,133
AudioEffectEnvelope      envelope2;      //xy=302,197
AudioAnalyzeFFT256       fft256_1;       //xy=304,272
AudioMixer4              mixer1;         //xy=486,163
AudioOutputI2S           i2s1;           //xy=640,161
AudioConnection          patchCord1(sine1, envelope2);
AudioConnection          patchCord2(sine1, fft256_1);
//AudioConnection          patchCord3(pink1, envelope1);
//AudioConnection          patchCord4(envelope1, 0, mixer1, 0);
AudioConnection          patchCord5(envelope2, 0, mixer1, 1);
AudioConnection          patchCord6(mixer1, 0, i2s1, 0);
AudioConnection          patchCord7(mixer1, 0, i2s1, 1);
AudioControlSGTL5000     sgtl5000_1;     //xy=517,297
// GUItool: end automatically generated code

AudioFilterFIR      myFilterL;
AudioFilterFIR      myFilterR;
AudioOutputI2S      audioOutput;        // audio shield: headphones & line-out

// Create Audio connections between the components
// Route audio into the left and right filters
AudioConnection c1(sine1, 0, myFilterL, 0);
AudioConnection c2(sine1, 1, myFilterR, 0);
// Route the output of the filters to their respective channels
AudioConnection c3(myFilterL, 0, audioOutput, 0);
AudioConnection c4(myFilterR, 0, audioOutput, 1);
AudioControlSGTL5000 audioShield;


struct fir_filter {
  short *coeffs;
  short num_coeffs;
};

// index of current filter. Start with the low pass.
int fir_idx = 0;
struct fir_filter fir_list[] = {
  {low_pass , 100},    // low pass with cutoff at 1kHz and -60dB at 2kHz
  {band_pass, 100},    // bandpass 1200Hz - 1700Hz
  {NULL,      0}
};


void setup() {
  Serial.begin(9600);
  delay(300);

  pinMode(PASSTHRU_PIN, INPUT_PULLUP);
  pinMode(FILTER_PIN, INPUT_PULLUP);

  // allocate memory for the audio library
  AudioMemory(8);

  audioShield.enable();
  audioShield.inputSelect(myInput);
  audioShield.volume(0.5);
  
  // Warn that the passthru pin is grounded
  if(!digitalRead(PASSTHRU_PIN)) {
    Serial.print("PASSTHRU_PIN (");
    Serial.print(PASSTHRU_PIN);
    Serial.println(") is grounded");
    
   // give the audio library some memory.  We'll be able
  // to see how much it actually uses, which can be used
  // to reduce this to the minimum necessary.
  AudioMemory(20);

  // enable the audio shield
  sgtl5000_1.enable();
  sgtl5000_1.volume(0.1);   
  
  // create a simple bass note using a sine wave
  sine1.frequency(500);
  sine1.amplitude(0.6);
  envelope2.attack(6.5);
  envelope2.hold(60);
  envelope2.decay(70);
  envelope2.sustain(0);
  
  // add both the note together, so we can hear them
  mixer1.gain(0, 2);
  mixer1.gain(1, 2);
  }

  // Warn that the filter pin is grounded
  if(!digitalRead(FILTER_PIN)) {
    Serial.print("FILTER_PIN (");
    Serial.print(FILTER_PIN);
    Serial.println(") is grounded");
  }  
  // Initialize the filter
  myFilterL.begin(fir_list[0].coeffs, fir_list[0].num_coeffs);
  myFilterR.begin(fir_list[0].coeffs, fir_list[0].num_coeffs);
  Serial.println("setup done");
}

// index of current filter when passthrough is selected
int old_idx = -1;

// audio volume
int volume = 0;
unsigned long last_time = millis();


int count = 0;
int speed = 60;

void loop()
{
  // Volume control
  int n = analogRead(15);
  if (n != volume) {
    volume = n;
    //uncomment this line if your audio shield has the volume pot
    //audioShield.volume((float)n / 1023);
  }
  
  // update the two buttons
  b_passthru.update();
  b_filter.update();
  
  // If the passthru button is pushed, save the current
  // filter index and then switch the filter to passthru
  if (b_passthru.fallingEdge()) {
    old_idx = fir_idx;
    myFilterL.begin(FIR_PASSTHRU, 0);
    myFilterR.begin(FIR_PASSTHRU, 0);
  }
  
  // If passthru button is released, restore previous filter
  if (b_passthru.risingEdge()) {
    if(old_idx != -1) {
      myFilterL.begin(fir_list[fir_idx].coeffs, fir_list[fir_idx].num_coeffs);
      myFilterR.begin(fir_list[fir_idx].coeffs, fir_list[fir_idx].num_coeffs);
    }
    old_idx = -1;
  }
  
  // switch to next filter in the list
  if (b_filter.fallingEdge()) {
    fir_idx++;
    if (fir_list[fir_idx].num_coeffs == 0) fir_idx = 0;
    myFilterL.begin(fir_list[fir_idx].coeffs, fir_list[fir_idx].num_coeffs);
    myFilterR.begin(fir_list[fir_idx].coeffs, fir_list[fir_idx].num_coeffs);
  }

  // print information about resource usage
  // Proc = 18 (18),  Mem = 4 (5)
  if (millis() - last_time >= 2500) {
    Serial.print("Proc = ");
    Serial.print(AudioProcessorUsage());
    Serial.print(" (");    
    Serial.print(AudioProcessorUsageMax());
    Serial.print("),  Mem = ");
    Serial.print(AudioMemoryUsage());
    Serial.print(" (");    
    Serial.print(AudioMemoryUsageMax());
    Serial.println(")");
    last_time = millis();
  }


}
 
Are you really using two audio shields? You have two AudioOutputI2S objects, one called i2s1 and another called audioOutput. Also two control objects, audioShield and sgtl5000_1. Suggest you create the audio graph you actually want to use (in the GUI tool) and then paste that in, in place of the section that is there now. Then check that any code you have copied from examples is calling the object by the same name and edit if not.
 
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