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Thinking about the United States and the variety of cultures / accents (mexican, chinese, etc.) I guess errors will happen very often.

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This brings up an interesting problem with the future coding of Google Voice. How is it suppose to determine whether it's someone with an accent saying bye bye or someone without an accent saying 55. Even if the dielects are taken into consideration, that is still going to be quite a difficult problem!

Context. You could compute the log likelihood ratio of "bye bye" given the previous word versus the log likelihood ratio of "55" given the previous word. If that's not good enough you can generalize this to use the previous N words.

Google should have a large enough corpus of text at it's disposal to be able to approach the problem this way, and they very well may already be doing so.

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