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`!HTK`! (Hidden Markov Model Toolkit) is a proprietary software toolkit for handling `F33f`_`[HMMs`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Hidden_Markov_model]`_`f. It is mainly intended for `F33f`_`[speech recognition`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Speech_recognition]`_`f, but has been used in many other `F33f`_`[pattern recognition`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Pattern_recognition]`_`f applications that employ HMMs, including `F33f`_`[speech synthesis`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Speech_synthesis]`_`f, `F33f`_`[character recognition`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=Character_recognition]`_`f and `F33f`_`[DNA sequencing`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=DNA_sequencing]`_`f.

Originally developed at the Machine Intelligence Laboratory (formerly known as the Speech Vision and Robotics Group) of the Cambridge University Engineering Department (CUED), HTK is now being widely used among researchers who are working on HMMs.

>>Contents

• `F0af`_`[See also`#see-also]`_`f

• `F0af`_`[References`#references]`_`f

• `F0af`_`[External links`#external-links]`_`f

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>>See also

• `F33f`_`[List of speech recognition software`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=List_of_speech_recognition_software]`_`f

>>References

• HTK Page in Cambridge University

>>External links

• optimizing HTK features using the `F33f`_`[TIMIT`:/page/wikibook/entry.mu`zim=wikipedia_en_all_nopic_2025-08.zim|entry_path=TIMIT]`_`f speech corpus (source code)

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