psych of music ch2

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psych of music ch2
2013-10-15 16:02:37

chap 2
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  1. Acoustics:
    The science of the production, transmission, and reception of sound
  2. Subdisciplines of acoustics (for
    example): Architectural acoustics
    achieving good sound within buildings
  3. Subdisciplines of acoustics: Bioacoustics
    studies the hearing and calls of animals, how animals are affected by the sounds of their habitat
  4. Subdisciplines of acoustics: Environmental acoustics
    studies noise caused by traffic, aircraft, industrial equipment, etc
  5. Subdisciplines of acoustics: Musical acoustics
    how musical instruments produce sound, how room design and sound reproduction processes affect musical sound and the perception of sound as music
  6. Sound Waves
    Sound waves occur when the vibration of an object causes changes in the air pressure around the object/ repeating pattern of air pressure changes traveling through air.
  7. More about sound waves
    chapter 2 slide 3
  8. Pure tone
    • simple sine wave pressure vibration. Most
    • sounds are NOT pure tones, but more complex waves! Tuning forks produce a very simple sound wave known as a pure tone
  9. Frequency
    number of times per second that the pressure wave goes through an entire cycle. Unit of measurement is Hertz (Hz). Determines the pitch of the tone (higher frequencies = higher pitch), refer to ch 2 slide 5
  10. Amplitude
    • size of the air pressure changes, determines
    • loudness of the tone. refer to ch2 slide 6
  11. Simple (pure) tone : single frequency
    200 Hz sine wave (pure tone)

    200 Hz complex tone

    refer to ch2 slide 7
  12. Complex tone
    • •vibrations at more than one
    • frequency

    •still perceived as a single tone

    • multiple component frequencies give
    • single   tone a different sound quality (timbre)
  13. Timbre
    • the distinctive quality of a particular tone. 
    • Distinguishes between the same pitch played by a guitar or oboe or piano or saxophone, etc
  14. Fourier Analysis
    • Any complex sound can be explained
    • as a series of sine functions of different frequencies

    • A Fourier analysis on this complex
    • tone would represent this wave with 4 sinusoidal waves.

    • The complex wave is simply the sum
    • of each of the component waves.