Palatalization
Palatalization is a phonetic modification in which a sound is produced by one party over the front of the hard palate as that used for the original sound.
For example, the Latin castellum castle gave in Old French , and following the law Bartsch caballus turned into a horse: the phenomenon that puts / k / Latin ( phoneme dorso-velar, articulated with the back of the tongue against the soft palate) to / / French (post-alveolar phoneme, pronounced against some of the hard palate) is a palatalization.
Palatalization has played an important role in the evolution of Romance languages , Slavic , and Indo-Aryan but also in Japanese (it explains why the consonants / t / and / s / are realized u to French pronounced palatalization in Slavic languages
Slavic languages, from the time of the Old Church Slavonic , underwent two palatalization.
first palatalization
The consonants palatalization in Chinese languages
It is especially for Mandarin causing the slip to the pronunciation of Peking (as transcribed by French Jesuit missionaries of the seventeenth century , to when the language was still close to the medieval Chinese ) to [peit] ( pnyn Beijing) Mandarin contemporary.

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