Player et processus

[a supprimer merci]

(03-17-2019, 05:59 AM)lamouette a écrit : ok mais alors comment fait le bruit pour passer?  Par retour dans  l'alimentation? Dans ce cas il est possible de faire un montage à deux alimentations séparées dont une après la sortie logique , en collecteur ouvert par exemple avec un transistor rapide .

J'avais posé la question à John Brown, d'ECDesigns, et cité sa reponse il y a quelques pages:

"Based on my personal research the source dependency problem has to be (partially) caused by ripple voltage on the digital interface signal(s). With USB this translates to a ripple voltage on the differential signals, differential interfaces cancel common mode noise but fail to cancel source related (unequal) noise on both interface signals. With S/PDIF coax it translates to ripple voltage on the electrical signal. With Toslink the ripple voltage is translated to fluctuations in the light output and translated to ripple voltage in the optical receiver.

The problem is that we can't simply use a "voltage stabiliser) to get rid of this ripple as the bandwidth of such circuit would be far too low. Even zener diodes are not fast enough and introduce unwanted non-linear effects that make matters even worse.
The only practical solution is using cleanest possible digital audio source and this also applies to many other DACs, even if these are based on built-in low phase noise clocks and FIFO buffers."

C'est le point de vue d'un ingenieur. D'autres auront peut etre trouvé d'autres solutions (mais il ne doivent pas etre nombreux...) 

Le DAC de Bruno Putzey (Mola-Mola) pretends etre insensible a la source. Sa conception est totalement propietaire. Mais c'est 10.000 euros...  Je n'ai pas testé !