The Disguise Self spell allows the caster to look like another creature. Due to my poor English skills I am not sure if this includes the voice or if it is just a visual matter.
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No, the illusion is purely visual.
There's nothing there that would allow you to disguise your voice, or the clanking of your armour, or any other sound you make. You look different, in specified ways, and that's pretty much it. The word "look" applies purely to your visual appearance.
Disguise Self is visual only. If it were meant to change your voice it would specifically say so, much like Alter Self does: