The Acoustic Dimension - PowerPoint PPT Presentation

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The Acoustic Dimension

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Human Ear. Transceiver based. Air Pressure to Diaphragm to electric current to ... The relationship between how our ear hears and how audio technology captures ... – PowerPoint PPT presentation

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Title: The Acoustic Dimension


1
The Acoustic Dimension
  • Sound and Synchronization Technology Evolution
  • Recording techniques / Perception
  • Post-Production
  • Presentation

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What is sound
  • Compressions and rarefactions of air pressure.
  • Transference of energy through a medium (air).

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What is sound
  • Energy propagates through a medium

Longitudinal Mechanical Wave
Wave propagating in air Compressions and
Rarefactions of air pressure
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  • Transceiver based.
  • For example Air Pressure to Diaphragm

Wave propagating in air from a transmitter (e.g.
a speaker) to a receiver (microphone diaphragm)
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  • Transceiver based.
  • Air Pressure to Diaphragm

Diaphragms can be an Ear Drum or a Microphone
Condencer Microphone
Human Ear
Dynamic Microphone
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  • Transceiver based.
  • Air Pressure to Diaphragm to electric current to

Sound wave moving a microphone diaphragm
resulting in a fluctuating voltage.
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  • Air Pressure to Diaphragm to electric current to
    digital encoding, and visa-versa
  • Fluctuating voltage is digitized by
  • sample rate (48KHz) Horizontal Resolution
  • bit depth (16bit) Vertical Resolution

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  • Digital Encoding of a Sound Wave
  • Fluctuating voltage is digitized by
  • sample rate (48KHz) Horizontal Resolution
  • bit depth (16bit) Vertical Resolution

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Perception of Sound
  • Psychoacoustics
  • the study of the relationship between physical
    sounds and the human perception of sound.
  • The relationship between how our ear hears and
    how audio technology captures sound is not
    intuitive.

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Perception of SoundPsychoacoustic Effects
  • The Haas Effect (or precedence effect)
  • An acoustic signal that arrives first at the ear
    suppresses the ability to hear other signals.
    40ms.
  • The Cocktail Party Effect
  • The ability in perception to select one desired
    sound from a background of ambient noise heard at
    the same time.

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Elements of Sound Design
Element Perception
Diagetic Content
Ambience Context
Sound FX Verisimilitude
Music Emotion
Diffusion Spacialization / Localization
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