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audio - Scaling PWM amplitude by switching an analog DC ...
https://electronics.stackexchange.com/questions/52419/scaling-pwm-amplitude-by-switching-an-analog-dc-voltage#:~:text=First%2C%20filter%20the%20volume%20PWM%20output%20to%20get,down%20to%20the%20level%20of%20the%20volume%20signal.
KR100242336B1 - Sound volume control circuit using …
https://patents.google.com/patent/KR100242336B1/en
The present invention generates a pulse width modulation (hereinafter, abbreviated as 'PWM') signal in which a duty ratio is variable according to a user's operation, and uses a PWM signal to...
Pwm pitch + volume control? - Audio - Arduino Forum
https://forum.arduino.cc/t/pwm-pitch-volume-control/62772
Pwm pitch + volume control? system June 3, 2011, 7:50pm #1. Hi everyone. I'm looking for a way to control volume of a pwm output while a melody is being played. I'd like to use a photoresistor hooked up to an analog input to control the volume. The example toneMelody is similar to what my code looks like except it's in void loop.
audio - Microcontroller PWM output volume - Electrical ...
https://electronics.stackexchange.com/questions/404199/microcontroller-pwm-output-volume
In the end, I came up with the solution shown below; basically, it uses two uC PWM outputs, one to control the volume (VOLPWM) and one to output the audio (OUTPWM); the VOLPWM gets heavily integrated and then the Q1 switches according to the OUTPWM between ground and the VOLPWM output voltage.
Simple PWM volume controller. Could it work? | …
https://www.electronicspoint.com/forums/threads/simple-pwm-volume-controller-could-it-work.13298/
direct PWM volume controller. The idea is that you simply take the audio and chop it with a high frequency, variable duty cycle signal. Then you use some type of low pass filter, to get rid of the high frequency component, and that's it: the output signal equals the input signal (theoretically no distortions), scaled by the PWM ratio.
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