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Filtering PWM Signals - LTwiki
http://www.ltwiki.org/images/8/82/PWM_Filters.pdf
Audio PWM DAC filtering - Electrical Engineering Stack ...
https://electronics.stackexchange.com/questions/103909/audio-pwm-dac-filtering
If you want a line-level output for headphones, recording, other audio systems, yes you should filter off the 45kHz PWM component. I would suggest the "3rd order Sallen-Key low-pass filter" from your filter design page as a starting point. It ought to provide a clean enough signal to prevent damage to anything downstream.
Audio using PWM, what is the principle behind it ...
https://electronics.stackexchange.com/questions/239442/audio-using-pwm-what-is-the-principle-behind-it
PCM with DAC, filter and amplifier. This depends on how your DAC is built internally. Most sound card DACs will be using sigma-delta modulation, which resembles PWM in that it's a one-bit signal turned on and off at high speed through a filter, but using a smarter algorithm to ensure the correct output level and slew rate.
High-pass filter a filtered PWM audio output? - Audio ...
https://forum.arduino.cc/t/high-pass-filter-a-filtered-pwm-audio-output/376344
The higher the PWM frequency the more filtering you'll get. If the PWM frequency is much-much higher than the highest audio frequency you should be able to get away with a simple filter. I'm not an expert on PWM audio 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.
PWM DAC | Open Music Labs
http://www.openmusiclabs.com/learning/digital/pwm-dac.1.html
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