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playing mp3

Posted: Fri Apr 30, 2021 8:05 pm
HI cicciocb,

on init the soundengine i get some spikes at the start from a mp3 song .
is it possible to catch these by an other programming routine or do i need an relais ?

Re: playing mp3

Posted: Sun May 02, 2021 5:51 am
by PeterN
Hi Panno,

do you observe the spikes in a setup with an external I2S-D/A-audio converter or are you using the internal D/A conversion at pin25?
Only with the internal conversion I can see/ hear this in my setup. May be because the Output pin is set to Vss/2= 1.6V as soon as initializing the analog output for playing the MP3.
If the output goes to a headset etc a serial 100nF condensor as high-pass can help.

Re: playing mp3

Posted: Mon May 03, 2021 9:09 pm
HI Peter,
thx for your Test. At the moment iam playing with an Lolin d32 Pro v2.0. the spikes coming on pin 25 using the esp32 intern dac.
i will test i2s tonight and show some results here.

danke fürs schauen