Conlanging for Friends

I've been working on a conlang for a non-linguist friend and seem to have
accidentally created a language in which there is no clear sign of the
negative separate from the construction of the basic parts of speech.
Negation is indicated by voiced consonants (except nasals, which indicates
positiveness) and 'glides' (w, r, y, h) in infixes.
Is there a precedent for this in a natlang?
"commune id vitium est, hic vivimus ambitiosa
paupertate"
"this is our common fault; here we live in ostentatious poverty"
Juvenal, Satires 3.182-3




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