One Hundred Years of Sound Change in Philadelphia: Linear Incrementation, Reversal, and Reanalysis

  title={One Hundred Years of Sound Change in Philadelphia: Linear Incrementation, Reversal, and Reanalysis},
  author={William Labov and William Ingrid Josef Rosenfelder and William Ingrid Josef Fruehwald},
  pages={30 - 65}
The study of sound change in progress in Philadelphia has been facilitated by the application of forced alignment and automatic vowel measurement to a large corpus of neighborhood studies, including 379 speakers with dates of birth from 1888 to 1991. Two of the sound changes active in the 1970s show a linear pattern of incrementation in succeeding decades. The fronting of back upgliding vowels /aw/ and /ow/ shows a reversal in the direction of change, beginning with those born after 1940. The… 
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