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Loudness and Pitch in Sound Perception

Loudness is the psychological perception related to sound intensity, while pitch is related to frequency. Learn about measuring loudness using matching and estimation procedures, and the concept of equal loudness contours. Discover pitch units, the mel scale, and the missing fundamental phenomenon in pitch perception. Explore the complexities of complex sound signals and timbre.

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Loudness and Pitch in Sound Perception

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  1. CHAPTER 12 Loudness and Pitch

  2. Loudness/Pitch • Loudness--psychological experience most directly related to sound pressure/intensity • Pitch--psychological experience most directly related to frequency Loudness/Pitch

  3. 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

  4. Equal Loudness Contours: The Phon Lines Loudness/Pitch

  5. 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

  6. PITCH: • Place Code • Periodicity Pitch • Missing Fundamental Phenomenon Loudness/Pitch

  7. Loudness/Pitch

  8. 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

  9. Complex Signals • Sounds with energy at more than one frequency • Timbre: Sense of voice or identity: conveyed by harmonics and timing patterns.

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