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A friend of mine has a theory that changing the emphasis from one syllable of a word to another never really affects the "core" pronunciation. So for instance, consider the word umbrella.

The emphasis usually falls on the second syllable: um · BREL · la. But if you decided to emphasize the first syllable instead: UM · brel · la, that doesn't really change what those syllables sound like; it just gives greater force to one of them. The first syllable is still a short-U sound in either case; it doesn't suddenly become a long-U sound because of an emphasis change.

Is my friend's theory correct? Or are there any counterexamples to this, where changing the emphasis actually does alter the fundamental sound of a syllable? (e.g. a legitimate emphasis change -- not a mispronunciation -- that changes a long-A sound to a short-A sound, for instance)

soapergem
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    Because of how English stress works, this will necessarily change the fundamental pronunciation, if one is to maintain the natural rhythm of the language. Unstressed syllables almost invariably become schwas or carets. Notice how both the u and the a in umbrella have the same pronunciation. – Anonym Mar 12 '14 at 18:57
  • user61979, I think you and I are disagreeing on some terminology. What I'm trying to convey by "fundamental pronunciation" is perhaps better called "vowel sounds." The emphasis always changes the pronunciation, yes, that much is obvious. But whether you say "um · BREL · la" or "UM · brel · la" -- like I said -- that does not really change the "fundamentals" of those syllables. It's still a short-U, short-E, and short-A. Two syllables are just "quicker". But it doesn't become ümbrella because of emphasis. If it did, that'd be what I call a fundamental change in the pronunciation. – soapergem Mar 12 '14 at 19:09
  • Really you're just saying the same phoneme that is already there in a louder and more forceful manner, and there is no intrinsic necessity to change the pronunciation (which includes changing a vowel sound). That said, you can choose to change the "vowel sound", or any other sound, for clarity, eg, "blasPHEEmous", or to make it easier to say, eg, in "emPHAsis on the wrong sylLAble", I tend to make the emphasised As long - but you don't HAVE to (and there I tend to say emphasised HAVE as HAFF, but that, again, is not based on any necessity). – nxx Mar 12 '14 at 19:16
  • A different emphasis that would require a different phoneme would be because you're saying a different word. – nxx Mar 12 '14 at 19:21
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    (By the way, it's stress, not "emphasis"; emphasis is a desired effect, not a measurable phenomenon.) Stress *always* changes vowel pronunciation in English. The full range of phonemically distinct vowels only occurs in stressed syllables. Unstressed syllables are likely to contain only vowels that are centralized to some allophone of /ə/. – John Lawler Mar 12 '14 at 20:10
  • I fail to understand. I don't say any part of "UMbrella" any differently than I do "umBRELla", and one can say "blasphemous" as "blasPHEmous" and retain the /ə/ sound as well as the /a/. Am I misunderstanding something? – nxx Mar 13 '14 at 20:43

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How about defense?

de-FENSE: the act of protecting.

DE-fense: in American football, the team not in possession of the ball.

Ace in PA
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