WAVEFORM form mp3 player

[MacIntoshCZ]

Hello,
what (standart) waveform from mp3 players/smartphone/laptop looks like? It is oscillating with DC offset to be positive only or its AC?
I did not find any mp3 player so i hook up FM radio 3,5jack output to oscilloscope and it was with DC offset. So DC only.
thanks

 

[Nigel Goodwin]

Hello,
what (standart) waveform from mp3 players/smartphone/laptop looks like? It is oscillating with DC offset to be positive only or its AC?
I did not find any mp3 player so i hook up FM radio 3,5jack output to oscilloscope and it was with DC offset. So DC only.
thanks

No, audio outputs to headphones or speakers are purely AC - a DC offset would be VERY detrimental to the speakers/headphones.