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This article should be translated (http://en.wikipedia.org/w/index.php?title=Final_devoicing&action=edit) (or additional material should be added) from material at de:Auslautverhärtung
Final devoicing (German: Auslautverhärtung, ie "hardening of the final sound") of voiced consonants is a systematic phonetic process occurring in languages such as German, Dutch, and Russian, among others. In these languages, where the voicing of consonants is phonological—that is, these languages feature minimal pairs like for example German Bein ("leg") vs. Pein ("pain"), distinguished only by the voicing of the initial consonant—the devoicing of final consonants constitutes a neutralisation of a phonological opposition which is usually made.
This thesis examines the acoustic nature of word-final devoicing process in Polish and provides a possible explanation for its development on the basis of the history of the Polish language.
The results revealed that word-final devoicing is not complete in Polish, and that the dialect regions influence the kind of voicing cues which maintain the voicing distinction phonetically.
For speakers from Warsaw in all environments and all places of articulation, the duration of glottal pulsing into closure was significantly longer for underlyingly voiced stops than for voiceless.