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PWM Audio Generation With An AVR | Hackaday
https://hackaday.com/2008/02/07/pwm-audio-generation-with-an-avr/
[Dane] sent in his sweet AVR hack. He used the PWM output to play pre-recorded audio output. It’s not very high quality, but it could be useful for …
PWM Audio | AVR Freaks
https://www.avrfreaks.net/forum/pwm-audio
Right now all AVR 8 bit hardware and software problems must be triaged from the one AVR forum. The ONLY exception is GCC, which has its own forum. I think there should at least be a hw branch and a sw branch, but sw comprises several compilers and assembler. ... The code would suggest that it generates the audio on OC2 pin PWM (timer2) and ...
AVR131: Using the AVR’s High-speed PWM
https://ww1.microchip.com/downloads/en/AppNotes/Atmel-2542-Using-the-AVR-High-speed-PWM_ApplicationNote_AVR131.pdf
High-speed PWM In the AVR®, the timer/counters can be used to generate PWM signals. PWM base frequency is determined by timer clock frequency and top counter value. Faster clock frequency will increase the PWM base frequency and vice versa. Lower top value will reduce the time for overflow, which thereby increases the PWM frequency.
AVR PWM Pulse Width Modulation - Tutorial #12
https://www.electroschematics.com/avr-pwm/
Timer/Counter2 is the simplest PWM device on the ATmega8. Timer/Counter2 is capable of running on 2 modes the Fast PWM mode and the Phase Corrected PWM mode; each of these modes can be inverted or non-inverted. Also note that there are three methods by which you can make PWM from AVR TIMER 1. Fast PWM; Phase and Frequency Corrected PWM; Phase …
The Most Interesting Stereo PWM Audio! - Embedds
https://embedds.com/the-most-interesting-stereo-pwm-audio/
For this project, an AVR Mega series microcontroller will be used to control the whole system. It transfers the stereo file 161828 baud (64 kbps of actual radio), where the RC filters is already set at a breakpoint of about 8khz. Since it’s a stereo type, thus two RC filters are needed in this project! You might found out another interesting ...
AVR PCM audio: Playing 8 bit PCM using any AVR ...
https://avrpcm.blogspot.com/2010/11/playing-8-bit-pcm-using-any-avr.html
This is a simple procedure to play PCM audio on any AVR microcontroller. AVR's high speed PWM is used to play the audio. It almost sound fine and can be used for simple projects that require sound effects. The code is compiled in winavr GCC compiler. The microcontroller used is ATmega32, though any AVR processor can be used for the purpose.
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.
PWM Techniques: A Pure Sine Wave Inverter
https://web.wpi.edu/Pubs/E-project/Available/E-project-042711-190851/unrestricted/PWM_Techniques_final.pdf
transformer. The inverted signal itself is composed of a pulse-width-modulated (PWM) signal which encodes a sine wave. The duty cycle of the output is changed such that the power transmitted is exactly that of a sine-wave. This output can be used as-is or, alternatively, can be filtered easily into a pure sine wave.
audio - Playing sounds on an AVR MCU - Electrical ...
https://electronics.stackexchange.com/questions/125447/playing-sounds-on-an-avr-mcu
I used an ATtiny85 to drive a speaker through a LPF via two complementary PWM outputs (OC1B/nOC1B) upon pressing a button. Less than 0.5k of code leaves 7.5k for the audio. Larger chips leave more space for audio or the ability to use real SPI or I 2 C for storage. Volume depends on the supply voltage, but you can still get decent performance from a half-dead Li-ion …
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