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sdima1357 / stm32f401cdu6_Audio

low noise low cost stm32 usb-audio dac with optional level meter
GNU Affero General Public License v3.0
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Schematics #1

Open mtexier opened 2 years ago

mtexier commented 2 years ago

I'm also trying to use a STM32 without a DAC to produce music. I it is possible to have a schematic of the electronic, I assume you do some filtering and amplification?

There is implemented virtual software second order sigma delta adc for the shift quantization noise to high frequency. see here (it [provide useful links too at the end of document):

I don't understand, PWM output means to create a DAC converter, and the mentionned paper seems to speak about ADC conversion.

And finally how it compares to this? http://www.openmusiclabs.com/learning/digital/pwm-dac/

Thanks.

Aether-yang commented 1 year ago

I'm also trying to use a STM32 without a DAC to produce music. @mtexier What about your work now？ Do you fix it?

sdima1357 commented 1 year ago

I'm also trying to use a STM32 without a DAC to produce music. I it is possible to have a schematic of the electronic, I assume you do some filtering and amplification?

There is implemented virtual software second order sigma delta adc for the shift quantization noise to high frequency. see here (it [provide useful links too at the end of document):

I don't understand, PWM output means to create a DAC converter, and the mentionned paper seems to speak about ADC conversion.

And finally how it compares to this? http://www.openmusiclabs.com/learning/digital/pwm-dac/

Thanks.

It uses same algorithm for sound processing as described in the paper. If You use analog (class A, AB or B) amplifier or headphones -they have native low pass filter. You have add low pass filter only in the case class D amplifier...