Can a /n/ turn into /r̃/?


I think I heard a nasalized alveolar trill /r̃/ instead of alveolar nasal stop
/n/ for the mora _na_ in this video <https://youtu.be/LIqnhSpXgtI?t=801>
(13:26). Am I correct?

(Whatever the phone is, is the allophone/variation more of an idiolect or more
of a dialect?)




As others have noted, this odd sound you hear at the 13:26 mark is not a
phoneme, but either phlegm in the speaker's throat, or an audio glitch or
other artifact from digitization.

In this specific instance, it's relevant to point out that trilling one's "r"s
is generally considered informal, sometimes even vulgar. This video is of a
professor discussing the grammar of Classical Japanese -- an extremely
unlikely social context for trilled pronunciation.

Although I could imagine //ɴ// (moraic "n", i.e. ん) before //ɾ// (the tap or
flap, as in らりるれろ) possibly parsing out as causing nasalization on the
following //ɾ//, the [[r̃]] itself would not be considered any kind of
allophone or alteration of //ɴ// -- the //ɴ// would still be there for
listeners, both moraically and in the nasalization it causes on the preceding
vowel (and sometimes also on the following phone).

There are no circumstances I've ever heard or read about where //n//,
especially mora-initial //n-// as in the video, would ever be rendered as a
trill of any sort.




As others have noted, this odd sound you hear at the 13:26 mark is not a
phoneme, but either phlegm in the speaker's throat, or an audio glitch or
other artifact from digitization.

In this specific instance, it's relevant to point out that trilling one's "r"s
is generally considered informal, sometimes even vulgar. This video is of a
professor discussing the grammar of Classical Japanese -- an extremely
unlikely social context for trilled pronunciation.

Although I could imagine //ɴ// (moraic "n", i.e. ん) before //ɾ// (the tap or
flap, as in らりるれろ) possibly parsing out as causing nasalization on the
following //ɾ//, the [[r̃]] itself would not be considered any kind of
allophone or alteration of //ɴ// -- the //ɴ// would still be there for
listeners, both moraically and in the nasalization it causes on the preceding
vowel (and sometimes also on the following phone).

There are no circumstances I've ever heard or read about where //n//,
especially mora-initial //n-// as in the video, would ever be rendered as a
trill of any sort.

