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I’m using Arduino MKR Zero with Adafruit UDA1334A breakout, when I play wav file which contain binaural audio, left and right channels are randomly switching their places. I’m using provided wav file example and reading wav file from sd card. Audio file is created in audacity and plays back on pc as intended. Any Ideas?

Thank you for your Arduino Sound library. So far I can output the amplitude and spectrum measured with the ICS43432 on the serial monitor but this is not particularly useful. I would like to be able to record the time history of the spectrum, capture normal modes, plot them versus time, etc. It's hard to do this on the serial monitor. I would really like to find a way to capture the data for later analysis and playback. I am thinking I will use an SPI NOR flash for this. I have one I can attach to the MCU that has either 16 or 128 MByte of memory. This ought to be enough for small snippets of sound capture.

What I would really like to do is to record sound from the ICS43432 I2S microphone attached to my STM32L4 MCU, store the data stream on a connected SPI NOR Flash or SD card, and then play it back via PWM tone or the dual DAC, etc.

I must have a mental block or something because I just can't seem to figure out how to capture the I2S data fast enough and more particularly, how to play it back.

Do you have any example using your sound library or otherwise that demonstrates how to capture and play back the I2S sound recorded from the ICS43432 microphone?

Perhaps it would be worthwhile to add another API to the ArduinoSound library to allow capture and playback of I2S data...

This constant wraps the setBufferSize function, but it's never defined in the library. Where is it defined?

Hello,
I've been using an I2S mic breakout board from Adafruit (SPH0645LM4H) https://www.adafruit.com/product/3421 and using the library successfully, however, while reading the datasheet (http://www.knowles.com/kor/content/download/5988/105771/version/4/file/SPH0645LM4H-BRevB.PDF) (page 3) I found that the actual output of the mic is 24bit rather than 32bit. Is there a possibility to add a 24bit option?

I've been inspecting the library and I could gladly help adding the option so it's available for everyone.

Thank you.

Xavier

Hi,

I tried compiling this on two differnt computers with both a Bluefruit M0 Feather as well as a ItsyBitsy M0.

In both cases I get this:

libraries/Adafruit_ZeroDMA/Adafruit_ZeroDMA.cpp.o: In function DMAC_Handler': Adafruit_ZeroDMA.cpp:(.text.DMAC_Handler+0x0): multiple definition of DMAC_Handler'
libraries/I2S/utility/DMA.cpp.o:DMA.cpp:(.text.DMAC_Handler+0x0): first defined here
collect2: error: ld returned 1 exit status
exit status 1
Error compiling for board Adafruit Feather M0.

Any idea how to remedy this?

Arduino: 1.8.2 (Mac OS X), Board: "Arduino/Genuino Uno"

In file included from /Users/user/Documents/Arduino/sketch_apr26a/libraries/ArduinoSound-master/src/ArduinoSound.h:28:0,
from /Users/user/Git/audio_sensor/audio_library_test/audio_library_test.ino:1:
/Users/user/Documents/Arduino/sketch_apr26a/libraries/ArduinoSound-master/src/AmplitudeAnalyzer.h:25:22: fatal error: arm_math.h: No such file or directory
#include <arm_math.h>
^
compilation terminated.
exit status 1
Error compiling for board Arduino/Genuino Uno.

This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.

ffmpeg on Linux adds a LIST section between fmt and data when converting an audio file to WAVE.

On the image below, you have the same file exported by ffmpeg on the left and Audacity on the right.

WAVE file with the LIST section don't work with the library right now.

there is no easy way with ffmpeg to remove this metadata. Getting this to work would allow a lot more files to work correctly with the library.

Hello,

Thank you very much for this library.
We are using it with an Arduino/Genuino Zero in order to develop applications for ambient noise frequency analysis, within the SmartCitizen project. We would like to perform FFT analysis on the new version of the kit and we found this library very useful.

However, we are finding some problems while trying to perform FFT analysis with sampling frequencies >30kHz and fftSizes = 64 (for 15kHz max frequency according to Nyquist Theorem). At some point during the acquisition and FFT calculation, it seems there is an Overload that provokes the execution to freeze. I am not sure of it being a memory Overload or other problem, so I give some details below of the case.

• Arduino/Genuino Zero with the ICS43432 installed on a Breadboard
• Execution of the example SpectrumSerialPlotter, although it also happens without the instruction fftAnalyser.read
• For fftSizes = 64, it happens when the sampling frequency is >30kHz (and lower freq if fftSizes are higher)
• Works finely at 8kHz - 15kHz, Although it sometimes has some issues when we have more frequencies implied (i.e. noises with broader spectrum effect)
• I have tried to track the failure by inputing some Serial.println on the different classes / functions and the execution seems to freeze after the I2S callback to the AudioInI2SClass::OnReceive.

Would you kindly shed some light on this issue? Have you tried to perform tests at these frequencies levels?

My apologies for any bad explanation I might have provided, I hope it is somehow clear.
Thank you beforehand for your help,

Óscar

I wired up the I2S MAX08357 breakout board to the MKZero and uploaded the WavPlayback from the https://github.com/arduino-libraries/ArduinoSound library. But somehow nothing useful happens.

If I use a wav file I get this:

Initializing SD card...initialization done.
wave file is invalid!

Disabling this check sheds some light on the issue:
Initializing SD card...initialization done.
Bits per sample = -1
Channels = -1
Sample rate = -1 Hz
Duration = 1 seconds
unable to play wave file using I2S!

This was with a mono, 8bit/sample wav file. OK, I tried a 16 bit mono, at least this file makes some sense to the parser...?
Bits per sample = 16
Channels = 1
Sample rate = 22050 Hz
Duration = 0 seconds
unable to play wave file using I2S!

If I go on and disable the sanity check this one file plays, not very clean, but at least something is coming out which is remotely like the sound I expect.

16bit stereo is again not recognized by the sketch...
Initializing SD card...initialization done.
Bits per sample = -1
Channels = -1
Sample rate = -1 Hz
Duration = 1 seconds
unable to play wave file using I2S!

To aggravate the problems, some 16bit/22050s/s/mono files will play, but not all of them, I cannot see the difference.

Any idea what do I do wrong?

Is your feature request related to a problem? Please describe.
I'm looking for a way to generate a reliable FFT from a PDM with minimal noise. I'd also like a way to get decibel measurements using the MP34DT05 on the Arduino Nano 33 BLE Sense.

Ideally the ArduinoSound library would be ported over to the nrf52840 chipset?

Describe alternatives you've considered
The PDM reading examples provided give a wave value, but I haven't been able to locate documentation for translating the read values into a reliable decibel reading.

Additional context
What are the roadblocks to porting the library?

Respected All,
I want to record 10-20 seconds audio files in .wav format. The audio source is coming from the earpieces of a Stethoscope to convert a conventional stethoscope into a digital stethoscope.
I have connected the SPH0645LM4H-B Adafruit I2S digital microphone with Arduino MKR1010.

With the help of #2 (comment) by @sandeepmistry
I am able to see visually the audio data in serial plotter.

I want to store this audio recordings in .wav format in (say my computer drive) for further signal processing in Matlab.
Requesting help in this regard,

Thanking You

Hi,
Thank you for this library.

I tried it with ICS-43432 and SPH0645 microphones and it works fine in MONO configuration.
I would like to use 2 of them in order to have a STEREO configuration :

Is there a way to differentiate the data coming from Right and Left channel ?

Thank you for your time.
Best regards, Mathieu.

Don't know if I understood the cue() feature correct, but shouldnt it play a Song from the given time on? When I call it, it only replays the song from beginning!

Thats a part of my code:

void audioCue(int t){
  if(t>0 && t<currentAudioFile.duration()){
    currentAudioFile.cue(t);
    Serial.println("Set playback to:");
    Serial.println(currentAudioFile.currentTime());
  }else{
    Serial.println("Cued Time not valid");
  }
}

currentAudioFile is a global var holding the currently played wav file (type: SDWaveFile)

Would this library work on an raspberry pi Pico?
It should be possible since it has an Arm Cortex-M0+ like the Mkr Zero!

Hi,

Thank you for producing this library, it has proved very useful for my latest project. At the moment I cannot seem to find a way to play back a wave file on an SD card via I2S with the arduino (MKR Zero) behaving as the slave to my DSP (ADAU1701). Ideally I would like the DSP to provide the master I2S clock.

Can this be achieved somehow?

Many thanks,

Edd Perks

Suggestion from @tigoe.

Hi,

When I modify the arduinosound library for my own operation, I found a wired issue.

I read the AmplitudeAnalyzer::update(const void* buffer, size_t size) function play the key role for further operation with I2S reading data. And the easiest way is to modify the rms functions: arm_rms_q31((q31_t*)buffer, size / 4, (q31_t*)&analysis)

But when I simply change the above sentence to

q31_t* tmp = (q31_t*)buffer;
_analysis = *tmp;

There appears zero value buffer occasionally (sometimes correct, but sometimes only shows zeros through serial print. And it will turn to zero and then turn to correct values).

I am not sure what is the problem cause I didn't change other logic in ArudioSound. Is there other magic in the rms functions?

.

Hi Sandeep,
I've seen you released quite many great additions to support boards with nRF52 from Nordic, like the Adafruit BLE Feather.

Do you plan to adapt this library to support the nRF52 platform too?

The chipset seems to be very popular due to its powerful architecture and flexible pin configurations, not to mention the EasyDMA also for I2S. I already use the BLE Feather with a MAX98357A Breakout and this library offers the infrastructure to read data from SD-card and stream it to an audio amp. Frankly I do not know how much effort it would be to tweak the code to support nRF52, but since you already have extensive experience with that platform and knowing your skills from other libraries for nRF52 you are the best guy for the job!