Monday, September 12, 2016
Class 2
-Microphones
•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
Insert pic in messenger
-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)
1