Spanish Sounds
By the 16th century, the consonant system of Spanish underwent the following important changes that differentiated it from neighboring Romance languages such as Portuguese and Catalan:
Initial /f/, when it had evolved into a vacillating /h/, was lost in most words (although this etymological h is preserved in spelling and in some Andalusian dialects is still aspirated).
The bilabial approximant / / (which was written u or v) merged with the bilabial oclusive /b/ (written b). There is no difference between the pronunciation of orthographic b and v in contemporary Spanish, excepting emphatic pronunciations that cannot be considered standard or natural.
The voiced alveolar fricative /z/ which existed as a separate phoneme in medieval Spanish merged with its voiceless counterpart /s/. The phoneme which resulted from this merger is currently spelled s.
The voiced postalveolar fricative / / merged with its voiceless counterpart / /, which evolved into the modern velar sound /x/ by the 17th century, now written with j, or g before e, i. Nevertheless, in most parts of Argentina and in Uruguay, y and ll have both evolved to / / or / /.
The voiced alveolar affricate /dz/ merged with its voiceless counterpart /ts/, which then developed into the interdental / /, now written z, or c before e, i. But in Andalusia, the Canary Islands and the Americas this sound merged with /s/ as well. See Ceceo, for further information.
The consonant system of Medieval Spanish has been better preserved in Ladino and in Portuguese, neither of which underwent these shifts.
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