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Filtering PWM Signals - LTwiki
http://www.ltwiki.org/images/8/82/PWM_Filters.pdf
The main reason to filter a PWM signal is to extract the modulation from the combined signal. There are a FEW cases where filtering is really not needed. One of those is drive for human-observed LEDs. The observer's eye provides all of the filtering needed if the PWM repetition frequency is above about 30Hz.
Audio PWM DAC filtering - Electrical Engineering Stack ...
https://electronics.stackexchange.com/questions/103909/audio-pwm-dac-filtering
It depends. 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.
Voice Band Audio Playback Using a PWM DAC …
https://www.ti.com/lit/ug/tidu703a/tidu703a.pdf
The audio amplifier circuit also acts as a first-order active low-pass filter of 20 kHz. This value is commonly referred to as the upper limit of human hearing. This filtering scheme means that signals between 4 kHz–20 kHz will be attenuated, while frequencies beyond 20 kHz are further reduced by the second LP filter at 20 kHz.
PWM DAC - Open Music Labs
http://www.openmusiclabs.com/learning/digital/pwm-dac.1.html
If your PWM frequency is out of the audible range, you won’t need to spend much effort filtering it, unless the amplifier you are putting it into doesn’t have a good low-pass filter at 20kHz. It is quite common on sound cards and mixing boards to use 30kHz …
STR7/STR9 audio generation with PWM
https://www.st.com/resource/en/application_note/an2394-str7str9-audio-generation-with-pwm-stmicroelectronics.pdf
the low-pass filter. Primarily, the filter cut-off frequency must be much lower than the PWM frequency to reduce the noise generated by PWM switching. A PWM frequency of 10 times the cut-off frequency is a generally sufficient. However, the cut-off frequency of the filter is critical to the bandwidth of the output audio.
High-pass filter a filtered PWM audio output? - Audio ...
https://forum.arduino.cc/t/high-pass-filter-a-filtered-pwm-audio-output/376344
PWM is more difficult to filter than "normal" PCM audio. With 44.1kHz PCM "CD audio" you can actually get-away with no filtering. The clock noise isn't nearly as bad with PCM as with PWM... I connected the output of a cheap soundcard to an oscilloscope once and I was surprised to see a stair-stepped PCM waveform with no filtering.
Circuit PWM to Audio - All About Circuits
https://forum.allaboutcircuits.com/threads/circuit-pwm-to-audio.57066/
I found a circuit which convert PWM into audio signal. First they used 2 cascade low pass filter and high pass filter, then LM386 audio amplifier with RC. Could anyone please explain in more detail about the circuit ? As I know, the first bandpass filter is used to attenuate the PWM. I have tried to play the duty cycle from digital 0x00 to 0xFF.
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