A propos de mon tout premier message sur ce fil, il est peut-être un peu optimiste.
En fait, il faisait référence à Kmixer, qui a disparu avec Windows XP.
Voici ce que disait la page web que j'avais sauvegardée sous forme de fichier texte:
"Here is a summary of what kmixer does to audio:
CONDITION 1: One audio stream is sent through audio through kmixer at a time
RESULT: kmixer streams the audio bit-transparently (when using usbaudio.sys) - that is, bit-for-bit, what goes in, also comes out. We have tested and proven this using a test function called 'Bittest' by Audio Precision.
CONDITION 2: Two audio streams of same sample rate are sent through kmixer
RESULT: kmixer streams both without problems, ASSUMING THE SUM OF THE AUDIO STREAMS DOES NOT ECLIPSE 0 dBFS!! Just like any digital mixer, if the sum of the audio eclipses 0 dBFS, digital clipping will occur, which is not popular among audio enthusiasts. However, if it does not eclipse 0 dBFS, there should be no problems. This was confirmed by playing a 'Bittest' stream with one app and a silence (all 0's) stream with another. The result was bit-transparency. NOTE: When multiple audio streams are summed in kmixer (even 16-bit audio streams), the result will be a 24-bit audio stream. THIS IS WHAT WE WANT, assuming we have a 24-bit device to receive it.
CONDITION 3: Two audio streams with different sample rates are sent through kmixer
RESULT: kmixer will up-sample the lower sample rate to the higher one. The higher one remains unaffected. This conversion is not very good though, and should be avoided. It is easily avoidable, however, as long as only one audio stream is playing at a time, or they are of equal sample-rates. "
L 'hypothèse que le mixer de Windows 7 se comporte à l'identique est peut-être optimiste.
Cordialement,
Jean-Jacques
