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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

  • 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


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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]


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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


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