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Audio via Arduino 16-bit PWM | Sand, software and sound
https://sandsoftwaresound.net/audio-via-arduino-16-bit-pwm/
The PWM outputs have a filter to convert the PWM bit stream to an analog voltage. The filter can be switched off if you want access to the raw digital data or PWM bit stream, making the Arduino’s outputs quite versatile. Depending upon your perspective, the littleBits filter is quite good for low bandwidth applications, not so good for audio.
High-pass filter a filtered PWM audio output? - Arduino Forum
https://forum.arduino.cc/t/high-pass-filter-a-filtered-pwm-audio-output/376344
and I'm not sure if you can set the Arduino's PWM frequency high enough for high-quality audio, even with a good filter. You can. Basically you need to set the PWM frequency to be at least twice the highest sample frequency. The PWM can …
Active low-pass filtering of Arduino's pwm output for a ...
https://circuitplay.blogspot.com/2013/11/active-filtering-of-arduinos-pwm-output.html
Arduino RC Circuit: PWM to Analog DC : 10 Steps ...
https://www.instructables.com/Arduino-RC-Circuit-PWM-to-analog-DC/
PWM DAC - Open Music Labs
http://www.openmusiclabs.com/learning/digital/pwm-dac.1.html
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