Abstract
The object of the in ves ti ga tion is sandhi in the modern Czech language based on phonetic research of Czech corpus of spoken language - ORTOFON. In the Czech Standard norm word-final obstruents undergo devoicing before initial sonant of the following word.
The research showed that the standard norm does not reflect fully the modern language situation. In the modern Czech language the word-final obstruents may undergo voicing before initial sonant.
The frequency of voiced word-final obstruents before initial sonant in analyzed material was very high.