Tiberian Hebrew
Tiberian Hebrew is the canonical pronunciation of the Hebrew Bible or Tanakh committed to writing by Masoretic scholars living in the Jewish community of Tiberias in ancient Judea c. 750–950 CE. They wrote in the form of Tiberian vocalization, which employed diacritics added to the Hebrew letters: vowel signs and consonant diacritics (nequdot) and the so-called accents (two related systems of cantillation signs or te'amim). These together with the marginal notes masora magna and masora parva make up the Tiberian apparatus.
Though the written vowels and accents came into use only c. 750 CE, the oral tradition they reflect is many centuries older, with ancient roots. Although not in common use today, the Tiberian pronunciation of Hebrew is considered by textual scholars to be the most exact and proper pronunciation of the language as it preserves all of the original Semitic consonantal and vowel sounds of ancient Hebrew.
Sources
Today's Hebrew grammar books do not teach the Tiberian Hebrew described by the early grammarians. The prevailing view is that of David Qimchi's system of dividing the graphic signs into "short" and "long" vowels. The values assigned to the Tiberian vowel signs reveals a Sephardi tradition of pronunciation (the dual quality of qames (אָ) as /a/, /o/; the pronunciation of simple sheva (אְ) as /ɛ̆/).