ESP8266 Community Forum

- Sat Jun 20, 2015 10:16 am #21024 @Sprite_tm & pvvx - tnx
works well! absolutly incredible job!

MY GITHUB: https://github.com/reaper7/

SDM Energy Meter: https://github.com/reaper7/SDM_Energy_Meter
MLEDScroll (TM1640 led matrix): https://github.com/reaper7/MLEDScroll

- Sat Jun 20, 2015 3:51 pm #21048

I'm impressed, the sound quality is actually very acceptable!

At what frequency does the pwm run then?

Not classic PWM -> http://www.beis.de/Elektronik/DeltaSigm ... Sigma.html
Output: 2xInegrator: https://github.com/pvvx/mp3_decode/blob ... main.c#L75
Log sample: Rate 48000 x 32 bits.

- Sat Jun 20, 2015 6:13 pm #21057 Congrat, Victor !

- Sat Jun 20, 2015 8:10 pm #21065

I'd expect rather poor sound quality though, as the pwm duty has only 8 bits resolution?

PWM_HACK = PWM 5 bits

Its reported elsewhere that it is 10 bit resolution?

Get you modules here:

https://www.banggood.com/custlink/KvGGhGF4wG