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Train&Align is a free online tool for automatic phonetic alignment. Its specificity is that it trains the acoustic models directly on the corpus to align, which makes it applicable to any language and speaking style.

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Experiments on several corpora have shown that it provides results comparable to other existing tools. It also allows the tuning of some training parameters. The use of tied-state triphones, for example, shows further improvement of about 1.5% for a 20 ms threshold. A manually-aligned part of the corpus can also be used as bootstrap to improve the model qual- ity. Alignment rates were found to significantly increase, up to 20%, using only 30 seconds of bootstrapping data.

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