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https://github.com/sdima1357/stm32f401cdu6_audio
low noise low cost stm32 usb-audio dac with optional level meter
https://github.com/sdima1357/stm32f401cdu6_audio
audio delta-sigma magic-eye pdm spdif stm32 stm32f4 tube-6br5 tube-6e1p usb-audio usb-audio-dac vu-meter
Last synced: 7 days ago
JSON representation
low noise low cost stm32 usb-audio dac with optional level meter
- Host: GitHub
- URL: https://github.com/sdima1357/stm32f401cdu6_audio
- Owner: sdima1357
- License: agpl-3.0
- Created: 2022-04-30T17:39:22.000Z (over 2 years ago)
- Default Branch: main
- Last Pushed: 2022-07-02T20:49:16.000Z (over 2 years ago)
- Last Synced: 2023-03-05T22:38:53.155Z (over 1 year ago)
- Topics: audio, delta-sigma, magic-eye, pdm, spdif, stm32, stm32f4, tube-6br5, tube-6e1p, usb-audio, usb-audio-dac, vu-meter
- Language: C
- Homepage:
- Size: 7.06 MB
- Stars: 45
- Watchers: 7
- Forks: 8
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- License: LICENSE
Awesome Lists containing this project
README
#stm32f401cdu6_Audio
stm32 green pill usb sound card
last one (press on image for video):
[](https://www.youtube.com/watch?v=8jB26_xrSuw)
[](https://www.youtube.com/watch?v=KB1A08Pj6nc)
https://www.youtube.com/watch?v=0MmWp3HdV2A
https://www.youtube.com/watch?v=GbiTxVYopDI
https://www.youtube.com/watch?v=TnEBuS5ONsY
High quality, low noise DAC based on 2 PWM timer channels with virtual software Sigma Delta ADC between stream from usb and PWM output.
There is implemented "sigma-delta floating point encoder" workaround of native stm32f401 limit 10.5 bits on 44100 Hz (1904 levels=84MHz/44.1KHz )
So, we can have for only $3 ,very low noise , high sound quality solution, which better then most onboard sound cards !
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):
https://www.analog.com/media/en/training-seminars/tutorials/MT-022.pdf
But instead one bit ( two levels ) i use more bits (0-MAX_LEVELS) Same technology can be used for esp32 high quality sound rendering.
14.04.2022 :
Added second order sigma-delta
number of LCD from zero to 2
minor bugs fixed
optional external i2s module
21.04.2022 :
-- Change to open drain timer1 PWM outputs( PA8 PA9 ) config for better noise supression.
27.04.2022
-- pll bug fix
-- up pwm freq to 384KHz - significant sound quality improvment
-- add tty output
30.04.2022
-- cheeper!!! green pill (stm32f401cdu6)version. Can buy here ( US $2.63 ) https://www.aliexpress.com/item/4001062944589.html
02.05.2022
-- detected problems with new STM32Cube_FW_F4_V1.27.0 audio driver. please build with <=STM32Cube_FW_F4_V1.26.0 . WIP
26.06.2022
-- add spdif output via i2s data pin
