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Chapter 4 - The World Was Once Analog. Introduction Sound, Vibrations, And Analog Recording (phonograph record) - An analog device maintains an exact physical analog of information. For example, bumps on an early phonograph recording correspond to vibrations that we perceive as sound.

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chapter 4 the world was once analog
Chapter 4 - The World Was Once Analog
  • Introduction
  • Sound, Vibrations, And Analog Recording(phonograph record) - An analog device maintains an exact physical analog of information. For example, bumps on an early phonograph recording correspond to vibrations that we perceive as sound.
  • Analog Electronic Devices- An electronic device is analog if the amount of electrical current it generates is proportional to its input. - cassette tape player
  • Many Electronic Devices Are Analog- At one time, most electronic devices used analog techniques to store, amplify, or emit pictures or sounds - AM/FM radios, stereos, televisions
chapter 4 the world was once analog2
Chapter 4 - The World Was Once Analog
  • The First Analog Communication - Early telephones used an analog scheme to send voice from one place to another; the amount of electrical current sent between two telephones was proportional to the volume of sound
  • Analog Is Simple But Inaccurate - An analog device always distorts the input and adds noise.
  • Sending An Analog Signal Across A Wire [signal loss - attenuation]
  • Digital Music - A technology is digital if it uses numbers to record information instead of a physical analog like bumps on a record or magnetism on a tape
  • The Digital Revolution [transistor -> ICs]
chapter 4 the world was once analog3
Chapter 4 - The World Was Once Analog
  • Computers Are Digital [Inside a computer, all information is represented by numbers]
  • Digital Recording
  • Using Digital To Recreate Analog [A-to-D converter]
  • Why Digital Music?
  • Summary
    • Information, including audio and video, can be encoded in digital form
    • The chief advantage of using a digital representation arises because the information does not become distorted while being stored, copied, or communicated