Are there any alternatives to The CMU Pronouncing Dictionary, commercial or open source?
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All the online dictionaries have a pronunciation guide. Although they differ in how they represent the phonemes. Are you just looking up the odd word or do you want to gather a large collection of them for a project (i.e. text to speech)? There are also many sites with audio, would that help? – Sam Hasler Oct 02 '08 at 12:26
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I don't know what @deadprogrammer wants this for, but I wanted a bunch of pronunciation data for a phonetics project. For my purposes, neither an online dictionary nor audio files would have helped. – A. Rex Feb 02 '09 at 16:54
6 Answers
I don't believe the answer is definitively "no," but I do know that CMU is the most popular pronouncing dictionary in my anecdotal experience. I believe it is open source so if it's missing something, perhaps you could find a way to add it (or request it be added).
Barring that, I would check with the folks at Language Log. They deal a lot with phonetics.

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I am searching for something similar, too. Next to it I found http://www.voxforge.org/home/downloads
There is CELEX 2, available from the Linguistic Data Consortium, which contains phonology information and costs $300. The problem is that it's a little dated, and the English dictionary is BE, not AE.
You can use CALLHOME, too, but with $2250 it's more more expensive than CELEX.

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I found DictionaryForMIDs and desktionary. I haven't used either but both are open source.

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