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ASTU 3030

ASTU 3030. Computers and Sound. Not So Distant Past. NOW. A Definition of Sound. Sound is a mechanical wave caused by the vibration of a physical object propagated through a medium from one location to another. http://www.physicsclassroom.com/class/sound/u11l1a.cfm.

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ASTU 3030

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  1. ASTU 3030 Computers and Sound

  2. Not So Distant Past

  3. NOW

  4. A Definition of Sound Sound is a mechanical wave caused by the vibration of a physical object propagated through a medium from one location to another. http://www.physicsclassroom.com/class/sound/u11l1a.cfm

  5. Characteristics of Sound Amplitude (or Dynamics) -Measured in Decibels or dB An average conversation occurs at 60-65 dB http://www.gcaudio.com/resources/howtos/loudness.html Frequency (or Pitch) -Measured in Hertz or Hz -Cycles per Second -Human hearing is in the 20 to 20khz range Timbre: the quality of a sound

  6. Electronic Sound Analog VS Digital

  7. Analog An analog signal is any continuous signal for which a variable is a representation of some other variable For example, in an analog audio signal voltage is directly related to sound pressure (sound waves).

  8. Digital An analog signal is continuous. A digital signal is not. Digital sound is produced by a digital machine (computer) outputting a series of discrete (individual/quantized) numbers to represent sound. *Remember that Computers only understand1’s and 0’s, or Binary

  9. Technical Characteristics of Digital Audio Sampling Rate The rate at which the frequency and time component of the digital audio signal are represented. Common sampling rates: 44.1khz 48khz 64khz 88.2khz 96khz

  10. Analog Signal Sampled Signal

  11. CD Quality Sampling Rate is typically 44.1khz or 48khz. In this class we will use 44.1khz *We will not use .mp3's. They are totally useless in hi-end digital audio work. Why? http://www.coryarcangel.com/downloads/Cory-Arcangel-666.mp3

  12. Technical Characteristics of Digital Audio Bit Rate or Bit Depth The rate at which volume is represented in a digital audio signal. CD quality is 16 bits. *CD quality audio has 65,536 volumes to choose from for every sample that’s measured. That’s called 16-bit audio (because 2 to the 16th power is 65,536). http://thestereobus.com/2008/01/12/sample-rate-and-bitrate-the-guts-of-digital-audio/

  13. Audio Design in the Digital Domain Our DAW is Adobe Audition -Almost all DAW's emulate or bear trace of analog systems. Non Linear/Non-Destructive Editing -Source material is not destroyed in the editing process. -The editing process does not necessarily have to be carried out from start to finish. Editing in the digital domain allows for an extreme level of precision and potential access to the manipulation of very fine details.

  14. Digital Audio Formats Uncompressed: .aif .wav .snd Compressed: .mp3 .ogg *Note: we will use 44.1k 16 bit .wav or .aif

  15. Common Audio/Sound Design Terms Gain Reverb Clipping Popping (yes, they're different) Filter Crossfade Track/ing Overdub Multi-track DAW VST Scrubbing DC

  16. Artistic and Aesthetic Potentials of Sound Sound has the potential to arouse or change physiological states. It is a physical medium and thus can be physically powerful. Sonic phenomenon are ephemeral and are not readily accessible by interpretation. Most of the vocabulary we use for sound comes from a visual or textural lexicon. However, it may be argued that our sense of hearing is more highly developed than our visual sense, regardless of whether we pay attention to it or not. Our ears can 'focus' on many events at once. Listening can give us clues to spatial orientation: distance, depth, speed, etc. The sense of hearing is also very good at alerting us to danger, activating memory, and providing us with enormous amounts of pleasure.

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