Harvard sentences

The Harvard sentences, sometimes called Harvard lines,[1] are a collection of sample phrases that are used for standardized testing of Voice over IP, cellular, and other telephone systems. They are phonetically balanced sentences that use specific phonemes at the same frequency they appear in English.

IEEE Recommended Practices for Speech Quality Measurements[2] sets out seventy-two lists of ten phrases each, described as the "1965 Revised List of Phonetically Balanced Sentences (Harvard Sentences)." They are widely used in research on telecommunications, speech, and acoustics, where standardized and repeatable sequences of speech are needed. The Open Speech Repository[3] provides some freely usable, prerecorded WAV files of Harvard Sentences in American and British English, in male and female voices.

Harvard lines are also used to observe how an actor's mouth can move when they are talking. This can be used when creating more realistic CGI models.[1]

List of Harvard Lines

List 1[4] consists of the following ten phrases:

  1. The birch canoe slid on the smooth planks.
  2. Glue the sheet to the dark blue background.
  3. It's easy to tell the depth of a well.
  4. These days a chicken leg is a rare dish.
  5. Rice is often served in round bowls.
  6. The juice of lemons makes fine punch.
  7. The box was thrown beside the parked truck.
  8. The hogs were fed chopped corn and garbage.
  9. Four hours of steady work faced us.
  10. Large size in stockings is hard to sell.

References
  1. "Why it’s so hard to make CGI skin look real" (at 7m13s), Vox, 3 August 2021.
  2. "IEEE Recommended Practice for Speech Quality Measurements". IEEE Transactions on Audio and Electroacoustics. 17 (3): 225–246. September 1969. doi:10.1109/TAU.1969.1162058. Retrieved 2012-01-05.
  3. "The Open Speech Repository". Retrieved 2012-01-05.
  4. "Harvard Sentences". Retrieved 2012-01-05.


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