Speech-to-IPA Conversion

Speech-to-IPA conversion seems very useful as a research tool specifically for languages that have no writing system. Graphical (in IPA) recording of these languages will allow statistical and NLP methods to be applied to them: tree-banks can be created.

It is worth investigating if it makes sense for currently used speech-to-text system adding an extra conversion layer: Speech-to-IPA-<language recognition>-to-scriptBasedText.

In fact the two-layer architecture of current implementation can be preserved if the acoustic model outputs phonetic information in IPA, while the language model receives the input in IPA.

Are there speech recognition systems that convert speech to IPA text?