Transcript Psychoacoustics - University of Florida

CHAPTER 12
Loudness and Pitch
Loudness/Pitch
• Loudness--psychological experience most
directly related to sound pressure/intensity
• Pitch--psychological experience most
directly related to frequency
Loudness/Pitch
Measuring Loudness:
• Matching Procedure: listeners match
loudness of tones at various frequencies to
1000 Hz tone -- yields unit of loudness
called the PHON
Loudness/Pitch
Equal Loudness Contours: The Phon
Lines
Loudness/Pitch
Measuring Loudness:
• Estimation or Scaling Procedure: listeners
rate tones for loudness -- yields unit called
the SONE
• 1 sone = loudness of a sound with a
loudness level of 40 phons.
• 2 sones are twice as loud as 1 sone.
• Loudness in Sones Doubles Every 10 dB
Loudness/Pitch
PITCH:
• Place Code
• Periodicity Pitch
• Missing Fundamental Phenomenon
Loudness/Pitch
Loudness/Pitch
PITCH UNITS
• mel scale--The psychophysical unit of pitch
• semitone - used in music; describes the
ratio (16/15) in frequency between sounds.
(Also used for the half step in the standard
chromatic scale)
Loudness/Pitch
Complex Signals
• Sounds with energy at more than one
frequency
• Timbre: Sense of voice or identity:
conveyed by harmonics and timing patterns.