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September 11, 2009

1. Cello


The pitch analysis shows the musical instrument’s ability to produce a single perceived pitch. Without vibrato, the cello note quickly stabilizes on a pitch with a deviation of less than 1 Hz throughout the note. When the string is released the sound begins to decay and we lose the pitch. The G2, the second lowest string on the instrument, has a relatively low average brightness of around 780 Hz, indicating that the instrument has a deeper, warmer sound. This corresponds to our common perception of the cello sound as rich and dark. The loudness also stabilizes throughout the bowing of the note.

2. Speech


Unlike the harmonic sound of an instrument, all analyses of a clip of human speech showed sporadic jumps and much wider ranges within one spoken phrase. In this 2 second cross-section, pitch ranged from about 90 to 400 Hz, varying with the different vowel sounds, consonant sounds, and changes in inflection. This clip was of a female british english voice, showing a bright quality of sound but still with rapid changes ranging from 900 to 8500 Hz. It was interesting to note that loudness seemed to be a similar pattern varying almost exactly inversely with brightness.


One Comment leave one →
  1. September 13, 2009 6:52 pm

    Very nice and clear descriptions and plots!!


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