07:700:135 Lecture 2: 13912-MusDigAud-2016-09-12

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18 Jan 2017
Monday, September 12, 2016
Class 2
Mics and Loudspeakers operate on theory of transduction
Transduction: conversion of energy from one form to another
-One energy -> another
-Sound -> electrical signal (also known as analog)
Sound: pressure waves caused by vibrations through air
-Can be reversed
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-Sound (mic) -> electrical -> sound (loudspeakers)
-Analog (vs digital), means using electrical signals w/o computer
Different methods that mics convert
-Dynamic mic
Sound waves cause coil to move magnet over, creates current. Changes in
current can be amplified and heard as sound
Doesn't require power
Use: Broader use, more live applications
-Condenser mic
Electrically static plates (instead of membrane, coil, moving back and forth)
Has a battery, so it requires power
Phantom power: usually +48V. Allows transmission of power over same cable
that inputs the power.
Use: Sensitive applications, violin, tend to be more expensive.
Ribbon mic (type of condenser)
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