IAT 202 Mics and Sound Editing Lab.doc

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Simon Fraser University
Interactive Arts & Tech
IAT 202
Susan Clements- Vivian

Microphones: 2 types • Dynamic: • Good for loud sounds • Durable • Not as sensitive, can't pick up a lot of detail without cranking gain • Don't need power (external) • Have diaphragm, have magnetic rod, have coil • Takes energy (lots of air pressure) to push diaphragm back, so not as sensitive • Headphones are • Used quite often on stage to avoid feedback • Condenser: • Really super thin diaphragms on either end • Electric charge held in middle • Slightest air pressure movement causes change in electrical charge • Need external power at all times (phantom power, 48V/9V) • Field recorders can give this to these mics • Can be easily damaged • Built into field recorders • Super sensitive, accept a lot of detail • More frequently used • Other types, but we don't have access to them • Polar/pick up pattern: • How they pick up sounds • Omnidirectional: • Picks up sound from all directions • Good for room tone, crowd noise (called Walla), just general ambience • Bidirectional or figure 8: • Can pick up sound from front and back • Rejects sound from sides • Pattern looks like figure 8 • Good for conversation between two people, recording harmonies of background signers • We don't have access to any. :( • Can accomplish with field recorders (two mics) • Cardioid: • Most common • "Heart" - think graphs! • Picks up sound mainly from the front • Rejects sound from the back, somewhat from the sides • Point source • Good for individual sounds • Also have super cardioid or hyper cardioid • Even more focused, really pick up from front and reject from behind • Mostly shot gun microphones • Used commonly on location • Usually condenser • Often come with batteries • Come with standard XLR connector (3 prong?) • Need special cable to connect to field recorder - must set to external mic • Some let you switch between super and hyper • Sometimes called telescopic because so super focused • Alien symbols: • Filters • Low cut: all sounds under 100Hz cut, bass cut • Reduces some noise, specifically rumbling (wind, walking, anything that generates bass) • Is the line up then flat • Minimizes noise • Need to use stereo mic or set up two mics if you want stereo sound How do you record sound on location? • Can get boom from library • Strongest person on team should be boom operator - will be holding up for a while! • Reflective sounds - voice hit floor and bounce up - if you point down, this is what you'll get! + ambience • So, can't put shotgun in middle and point down • Also can't put omni in middle - will pick up everything, not just dialog! • Boom operator needs to know who's talking and when • Will switch between people as they talk, point toward them • Constantly flipping back and forth
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