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Audio via Arduino 16-bit PWM | Sand, software and sound
http://sandsoftwaresound.net/audio-via-arduino-16-bit-pwm/
Audio folks who get into Arduino often ask, “Gee, why not use PWM to produce audio — a poor man’s DAC?” 8-bit PWM resolution is the default supported PWM mode. The resolution and the bandwidth is not sufficient to support decent audio.
PWM Audio Output support for the "arduino-audio-tools ...
https://www.pschatzmann.ch/home/2021/06/30/pwm-audio-output/
The advantage of this approach is, that we can output audio to almost any GPIO pin, and that it can be used on any other processor which supports PWM. I have extended my arduino-audio-tools project to provide this functionality with a Stream based and a callback based API. The following processors are currently supported: Raspberry Pico ESP32
audio - How to use PWM with an Arduino - Electrical ...
https://electronics.stackexchange.com/questions/257958/how-to-use-pwm-with-an-arduino
The PWM frequency itself needs to be 256 times higher to approach 8-bit control over amplitude, so we are talking PWM frequency of 2 MHz, minimum, and that's rather poor audio quality. For "CD quality" 16-bit samples, you'd have 44100 * 65536 = PWM frequency of 2.9 GHz.
analog audio in to PWM audio out - Arduino Forum
https://forum.arduino.cc/t/analog-audio-in-to-pwm-audio-out/139411
it takes in audio on ADC0 and uses a dual pwm to create 16b audio out. you can process the audio in-between and make a low-fi effects pedal. it can be used for just analog out as well, and is much higher quality than using analogwrite (although more complicated too). there is a much more in-depth tutorial on pwm in general up here:
Arduino PWM Tutorial - Arduino Project Hub
https://create.arduino.cc/projecthub/muhammad-aqib/arduino-pwm-tutorial-ae9d71
Arduino and PWM The Arduino IDE has a built in function “analogWrite ()” which can be used to generate a PWM signal. The frequency of this generated signal for most pins will be about 490Hz and we can give the value from 0-255 using this function. analogWrite (0) means a signal of 0% duty cycle. analogWrite (127) means a signal of 50% duty cycle.
TOPIC: Configure Arduino UNO PWM outputs to play audio.
https://www.electrosmash.com/forum/pedalshield-uno/111-configure-arduino-uno-pwm-outputs-to-play-audio
Anything above the audio spectrum its ok, using 8 bit resolution a nice balanced point is using 31.3KHz. If you want to understand all the posibilities and Configuring Arduino UNO registers for PWM audio: There are basically 3 registers that controls everything: PWM_QTY: Sets to 1 for Single PWM, and 2 for Dual PWM.
Arduino Audio Output : 10 Steps (with Pictures ...
https://www.instructables.com/Arduino-Audio-Output/
audio playback device - make your own ipod. With the addition of an SD shield you could create your own Arduino mp3 player (check out the wave shield documentation for an idea of how to get started with the code). The circuits and code provided here are compatible with SD shields that communicate via SPI.
PWM DAC - Open Music Labs
http://www.openmusiclabs.com/learning/digital/pwm-dac.1.html
If you want to calculate the PWM frequency for a different setup, it is Fpwm = (Fcpu/m)/ (2^ (B/n)) where B is the bit depth you want, m is the slope number (1 for Fast PWM, 2 for Phase Correct), and n is the number of PWMs used. Figure 2 – Bit depth versus frequency trade-off for various PMW methods at 16MHz I/O clock.
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