audio "sticking"

ShreddinPB · Aug 16, 2016

Hey guys, I am trying to start an audio project, im just in the testing phase and have run into something. Im using and FFT and a peak, no matter which one I use, the audio sticks.
Cant really explain, but look at the images, when the sketch starts, all the audio is 0.0, and when the mic pics up audio the lower parts keep values, the louder the audio the more stays. I did try different mics with the same result.
before audio

after audio

The code is very basic.

Code:

/* Mono Peak Meter

   Scrolling peak audio level meter in the Arduino Serial Monitor

   Audio input needs to connect to pin 16 (A2).  The signal range is 0 to 1.2V.
   See the documentation in the Audio System Design Tool for the recommended
   circuit to connect an analog signal.

   This example code is in the public domain
*/

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

// GUItool: begin automatically generated code
AudioInputAnalog         adc1(A0);       //xy=413,132
AudioAnalyzePeak         peak1;          //xy=637,122
AudioAnalyzeFFT256       myFFT;       //xy=654,240
AudioConnection          patchCord1(adc1, peak1);
AudioConnection          patchCord2(adc1, myFFT);
// GUItool: end automatically generated code


void setup() {
  AudioMemory(24);
  Serial.begin(9600);

  myFFT.windowFunction(AudioWindowHanning1024);
}

// for best effect make your terminal/monitor a minimum of 31 chars wide and as high as you can.

elapsedMillis fps;

void loop() {

  getFFT();
  
  //getPeak();
}

void getFFT() {
  float n;
  int i;

  if (myFFT.available()) {
    // each time new FFT data is available
    // print it all to the Arduino Serial Monitor
    Serial.print("FFT: ");
    for (i=0; i<40; i++) {
      n = myFFT.read(i);
      if (n >= 0.01) {
        Serial.print(n);
        Serial.print(" ");
      } else {
        Serial.print("  -  "); // don't print "0.00"
      }
    }
    Serial.println();
  }
}

void getPeak()
{
  if (fps > 24) {
    if (peak1.available()) {
      fps = 0;
      int monoPeak = peak1.read() * 30.0;
      Serial.print("|");
      for (int cnt=0; cnt<monoPeak; cnt++) {
        Serial.print(">");
      }
      Serial.println(monoPeak);
    }
  }
}

Any ideas what is going on?

ShreddinPB · Aug 17, 2016

Teensy 3.2, no audio shield.
Tried both the adafruit and sparkfun Electet microphone.
Sorry wrote this last night after a long day

WMXZ · Aug 17, 2016

ShreddinPB said:
Teensy 3.2, no audio shield.
Tried both the adafruit and sparkfun Electet microphone.
Sorry wrote this last night after a long day

I tried to compile the sketch, it does, I tried to download, it failed : download error (after erase)
win10, A1.6.9 TD1.29b3
(strange never had such errors)

OK,
I could not download blink (applying all know tricks)
had to remove all USB disks on the Hub, then succeeded to download blink.
will try again

edit2: now will ask button press, and after button press will not react.
Have no idea, what is going on
most likely, I have to step back and try to find out

Frank B · Aug 17, 2016

Maybe because there is no output-object.
Try to add one, just as a dummy..

ShreddinPB · Aug 17, 2016

Frank B said:
Maybe because there is no output-object.
Try to add one, just as a dummy..

Like this?

Code:

AudioInputAnalog         adc1(A0);       //xy=232,162
AudioAnalyzePeak         peak1;          //xy=456,152
AudioAnalyzeFFT256       myFFT;          //xy=473,270
AudioOutputAnalog        dac1;           //xy=583,208
AudioConnection          patchCord1(adc1, peak1);
AudioConnection          patchCord2(adc1, myFFT);
AudioConnection          patchCord3(adc1, dac1);

I can test when I get home from work, for some reason the teensy cant communicate with my work computer

DerekR · Aug 17, 2016

Two things I don't see in the original code:

AudioControlSGTL5000 audioShield;

among your definitions, and

audioShield.enable();

in setup()

Frank B · Aug 17, 2016

@DerekR, he does not use the shield.

ShreddinPB · Aug 17, 2016

Frank B said:
@DerekR, he does not use the shield.

Right. I do have one, but this project only needs the fft and the peak, so I dont see a reason to use it and add the extra space needed, plus, I have 3 teensys for different things all going to be running the same code, so that would be three audio boards also.

DerekR · Aug 17, 2016

Wow - I had assumed that you needed a codec to run Audio library stuff in order to manage I/O and bundling data into blocks etc. I'll have to go back and look at just what the SGTL5000 does here...

Maybe I'm extra dumb, but I don't see any sampling rate control, data acquisition, and timing anywhere in the sketch. How/where are the length 128 audio blocks created and passed to the fft and peak functions in this sketch?

Frank B · Aug 17, 2016

no, indeed, the teensy does all the work.
there are several output-objects - the (hardware-wise) simplest are the internal DAC and S/PDIF

ShreddinPB · Aug 17, 2016

DerekR said:
Wow - I had assumed that you needed a codec to run Audio library stuff in order to manage I/O and bundling data into blocks etc. I'll have to go back and look at just what the SGTL5000 does here...

Maybe I'm extra dumb, but I don't see any sampling rate control, data acquisition, and timing anywhere in the sketch. How/where are the length 128 audio blocks created and passed to the fft and peak functions in this sketch?

I took the code directly from the PeakMeterMono example sketch.

Code:

/* Mono Peak Meter

   Scrolling peak audio level meter in the Arduino Serial Monitor

   Audio input needs to connect to pin 16 (A2).  The signal range is 0 to 1.2V.
   See the documentation in the Audio System Design Tool for the recommended
   circuit to connect an analog signal.

   This example code is in the public domain
*/

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

// GUItool: begin automatically generated code
AudioInputAnalog         adc1;           //xy=164,95
AudioAnalyzePeak         peak1;          //xy=317,123
AudioConnection          patchCord1(adc1, peak1);
// GUItool: end automatically generated code


void setup() {
  AudioMemory(4);
  Serial.begin(9600);
}

// for best effect make your terminal/monitor a minimum of 31 chars wide and as high as you can.

elapsedMillis fps;

void loop() {
  if (fps > 24) {
    if (peak1.available()) {
      fps = 0;
      int monoPeak = peak1.read() * 30.0;
      Serial.print("|");
      for (int cnt=0; cnt<monoPeak; cnt++) {
        Serial.print(">");
      }
      Serial.println();
    }
  }
}

DerekR · Aug 17, 2016

Okay. Did you see that
" AudioInputAnalog has a known bug at 72 MHz. Use 48 or 96 MHz clock speed (Tools > CPU Speed menu). "
in the documentation. I guess you're using 96 MHz anyway, so that's probably not the cause of the problem... just a thought.

I've just been called for dinner, but I'll try it here after that and get back to you. (I'll try using the Audio library sine as an input as well)

ShreddinPB · Aug 17, 2016

DerekR said:
Okay. Did you see that
" AudioInputAnalog has a known bug at 72 MHz. Use 48 or 96 MHz clock speed (Tools > CPU Speed menu). "
in the documentation. I guess you're using 96 MHz anyway, so that's probably not the cause of the problem... just a thought.

I've just been called for dinner, but I'll try it here after that and get back to you. (I'll try using the Audio library sine as an input as well)

Im pretty sure im at 96 also but will check when I get home.

DerekR · Aug 17, 2016

Okay so here's the deal (I hope)

1) Your code is basically "borrowed" from the Teensyduino FFT example File>Examples>(Teensyduino)Audio>Analysis>FFT without the Audio shield stuff.
2) Every sketch for the Audio library MUST have an output block - even if it not used.
3) I modded your code to use a sine input at 1037 Hz, which in a 1024 pt FFT creates a single line in bin 6, and removed the Hanning window so as not to smear the peak.

Code:

/* Mono Peak Meter

   Scrolling peak audio level meter in the Arduino Serial Monitor

   Audio input needs to connect to pin 16 (A2).  The signal range is 0 to 1.2V.
   See the documentation in the Audio System Design Tool for the recommended
   circuit to connect an analog signal.

   This example code is in the public domain
*/

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

// GUItool: begin automatically generated code
AudioSynthWaveformSine   sine1;       //xy=413,132
AudioAnalyzePeak         peak1;       //xy=637,122
AudioAnalyzeFFT256       myFFT;       //xy=654,240
AudioOutputAnalog        dummyOutput;               //  <---- Necessary even though not used

AudioConnection          patchCord1(sine1, peak1);
AudioConnection          patchCord2(sine1, myFFT);

void setup() {
  AudioMemory(24);
  Serial.begin(9600);
  delay(2000);
  sine1.amplitude(0.5);
  sine1.frequency(1034.007);                     // Line 6 in FFT1024
  myFFT.windowFunction(NULL);                    // Changed to give a "clean" spectral line
//  myFFT.windowFunction(AudioWindowHanning1024);
}
elapsedMillis fps;
void loop() {
  getFFT();
  //getPeak();
}

void getFFT() {
  float n;
  int i;
//Serial.println("in getFFT");
  if (myFFT.available()) {
    // each time new FFT data is available
    // print it all to the Arduino Serial Monitor
    Serial.print("FFT: ");
    for (i=0; i<40; i++) {
      n = myFFT.read(i);
      if (n >= 0.01) {
        Serial.print(n);
        Serial.print(" ");
      } else {
        Serial.print("  -  "); // don't print "0.00"
      }
    }
    Serial.println();
  }
}

void getPeak()
{
  if (fps > 24) {
    if (peak1.available()) {
      fps = 0;
      int monoPeak = peak1.read() * 30.0;
      Serial.print("|");
      for (int cnt=0; cnt<monoPeak; cnt++) {
        Serial.print(">");
      }
      Serial.println(monoPeak);
    }
  }
}

Without the line
AudioOutputAnalog dummyOutput;
myFFT.available() never returns true, and so data is never read from the fft buffer, but as soon as I added it everything came to life with the correct frequency and amplitude.
View attachment 7885

Hope this fixes it for you.

ShreddinPB · Aug 17, 2016

DerekR said:

Okay so here's the deal (I hope)

1) Your code is basically "borrowed" from the Teensyduino FFT example File>Examples>(Teensyduino)Audio>Analysis>FFT without the Audio shield stuff.
2) Every sketch for the Audio library MUST have an output block - even if it not used.
3) I modded your code to use a sine input at 1037 Hz, which in a 1024 pt FFT creates a single line in bin 6, and removed the Hanning window so as not to smear the peak.

Code:

/* Mono Peak Meter

   Scrolling peak audio level meter in the Arduino Serial Monitor

   Audio input needs to connect to pin 16 (A2).  The signal range is 0 to 1.2V.
   See the documentation in the Audio System Design Tool for the recommended
   circuit to connect an analog signal.

   This example code is in the public domain
*/

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

// GUItool: begin automatically generated code
AudioSynthWaveformSine   sine1;       //xy=413,132
AudioAnalyzePeak         peak1;       //xy=637,122
AudioAnalyzeFFT256       myFFT;       //xy=654,240
AudioOutputAnalog        dummyOutput;               //  <---- Necessary even though not used

AudioConnection          patchCord1(sine1, peak1);
AudioConnection          patchCord2(sine1, myFFT);

void setup() {
  AudioMemory(24);
  Serial.begin(9600);
  delay(2000);
  sine1.amplitude(0.5);
  sine1.frequency(1034.007);                     // Line 6 in FFT1024
  myFFT.windowFunction(NULL);                    // Changed to give a "clean" spectral line
//  myFFT.windowFunction(AudioWindowHanning1024);
}
elapsedMillis fps;
void loop() {
  getFFT();
  //getPeak();
}

void getFFT() {
  float n;
  int i;
//Serial.println("in getFFT");
  if (myFFT.available()) {
    // each time new FFT data is available
    // print it all to the Arduino Serial Monitor
    Serial.print("FFT: ");
    for (i=0; i<40; i++) {
      n = myFFT.read(i);
      if (n >= 0.01) {
        Serial.print(n);
        Serial.print(" ");
      } else {
        Serial.print("  -  "); // don't print "0.00"
      }
    }
    Serial.println();
  }
}

void getPeak()
{
  if (fps > 24) {
    if (peak1.available()) {
      fps = 0;
      int monoPeak = peak1.read() * 30.0;
      Serial.print("|");
      for (int cnt=0; cnt<monoPeak; cnt++) {
        Serial.print(">");
      }
      Serial.println(monoPeak);
    }
  }
}

Without the line
AudioOutputAnalog dummyOutput;
myFFT.available() never returns true, and so data is never read from the fft buffer, but as soon as I added it everything came to life with the correct frequency and amplitude.
View attachment 7885

Hope this fixes it for you.

Yeah, I am just a hack and this is the easiest way for me to learn, grab pieces of code and put them together and try

Sadly, this didnt fix it.
I switched it to the peak test which is also borrowed from the example, same result.
I added a dummy output and even connected a patch cord as a pass thru.
Im going to try on one of my other teensys

Image on the left is after its turned on, image on the right is how it settles after putting some loud noises into the mic.

ShreddinPB · Aug 17, 2016

Ok, I made a brand new one, I had another teensy that wasnt put together yet, and its exactly the same. Tried the mic on A0 again, then switched to A1 and its the same.. made a little vid and put it on youtube to make it easier to see what is going on.
https://youtu.be/zfhD5u0v0AM

duff · Aug 18, 2016

ShreddinPB said:
Ok, I made a brand new one, I had another teensy that wasnt put together yet, and its exactly the same. Tried the mic on A0 again, then switched to A1 and its the same.. made a little vid and put it on youtube to make it easier to see what is going on.
https://youtu.be/zfhD5u0v0AM

I wonder if its due to the dc_average update?

ShreddinPB · Aug 18, 2016

duff said:
I wonder if its due to the dc_average update?

How do I test that?

ShreddinPB · Aug 18, 2016

As a note, I just tried the example FFT with my audio shield and it works as expected.
I guess the next is to test the mic output and see if the signal is sticking there or if its in the teensy?

duff · Aug 18, 2016

ShreddinPB said:
How do I test that?

Actually I'm not sure how to test that

But I'm very interested in this topic for project I'm working on now, when i get back home I'll definitely follow up on this thread.

DerekR · Aug 18, 2016

It's a real head scratcher! Obviously your loop() is still running, and data is available, but the data is not being updated in the fft and peak functions. Interesting that it runs with the audio shield.

I've looked at the peak object's analyze_peak.h and analyze_peak.cpp: they are VERY simple. I can't see anything there that would cause a data dependent failure.

Another puzzlement is why your original post ran without an output object.???

Is there any chance you might have an old/corrupt copy of the audio library or teensyduino?

ShreddinPB · Aug 18, 2016

DerekR said:
It's a real head scratcher! Obviously your loop() is still running, and data is available, but the data is not being updated in the fft and peak functions. Interesting that it runs with the audio shield.

I've looked at the peak object's analyze_peak.h and analyze_peak.cpp: they are VERY simple. I can't see anything there that would cause a data dependent failure.

Another puzzlement is why your original post ran without an output object.???

Is there any chance you might have an old/corrupt copy of the audio library or teensyduino?

Its the newest teensyduino, just installed it I believe, and I had it install audio that came with it, I can reinstall. Its arduino 1.6.5 cause the newer ones with teensy dont seem to work with FastLED correctly.
As a note, the audio shield one is working thru the mic input with a microphone, not thru the adc, I can also test that tonight.
I wish I could test at work, but whenever I try to connect the serial monitor arduino reports "Port Busy" any idea what that could be? I did remove the old teensy drivers and tried the windows one since I am on windows 10 and the same reslult

ShreddinPB · Aug 24, 2016

Still havnt got this figured out sadly.

PaulStoffregen · Aug 24, 2016

ShreddinPB said:
Still havnt got this figured out sadly.

Can you give me a quick update on which of the main programs on this thread to use to reproduce this problem?

ShreddinPB · Aug 24, 2016

PaulStoffregen said:
Can you give me a quick update on which of the main programs on this thread to use to reproduce this problem?

The code you posted (which is just my code reporposed from the example) does reproduce this with the mic plugged into A0 (14)

audio "sticking"

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