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Evolution of Sound Technology: From Wave Propagation to Digital Encoding

Explore the history and transformation of sound technology, from the basics of sound waves in air to modern digital encoding techniques. Discover how energy propagates through mediums, transceivers link air pressure to diaphragms, and psychoacoustic effects impact human perception. Learn about compression, rarefaction, transference of energy, post-production processes, and elements of sound design.

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Evolution of Sound Technology: From Wave Propagation to Digital Encoding

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

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

  3. What is sound • Energy propagates through a medium Longitudinal Mechanical Wave • Wave propagating in air • Compressions and Rarefactions of air pressure

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

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

  6. Transceiver based. • Air Pressure to Diaphragm to electric current to … Sound wave moving a microphone diaphragm resulting in a fluctuating voltage.

  7. 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

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

  9. 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.

  10. 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.

  11. Elements of Sound Design

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