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Lecture

IAT 202 Lecture Notes - Bit Rate, Digital Single-Lens Reflex Camera, Human Voice


Department
Interactive Arts & Tech
Course Code
IAT 202
Professor
Susan Clements- Vivian

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Sweeping Process
6 steps
1. Spotting - watch film, determine what sound effects we need to use for that clip
Typically separate ones for music and sound effects. No music for this assignment, so just for
determining type of sound effects required for clip.
Have in, out, time, duration, desc.
2. Gathering - get those sounds that you want. Can go out with field recorder and capture
sounds, use foley (recording sound effects in studio, recreate sound effects you think you're
hearing, no foley studio here), use samples (sound effects from a library, we have this! Can
use in conjunction with field recording. Have to go to library, on Mac, click on Sound Effects
on desktop, search)
3. EDL (Edit decision list, skip for this assignment). Final list of sound effects and music.
4. Lay down. Editing audio and syncing audio to specific actions/scenes.
5. Mix. Balancing, volume level, effects, pan.
6. Stamping audio to video. Export everything. Have rendered video with sound effects in it.
Field Recorders:
Stereo: 2 channels of audio
Mono: 1 channel
Most sound effects are mono
Pan option to place sound in center (between 2 speakers), or pan hard left or hard
right (feels like coming from one of the speakers). Also phantom stuff, beyond scope of
course. Music always panned left and right.
All those settings in Menu:
Sound travels in waves (sin wave as example)
Cycles per second - frequency, hertz, Hz
Hearing range is between 20Hz (low, bass) and 20000Hz (high, treble) - as you
get older, upper limit gets less and less.
Human voice around 1000 - 4000 Hz, bulk of frequency. Mid frequency range.
Bass requires a lot of air movement by speakers, cycles take long time to
complete, very long
Sample rate
44100Hz as example
Used in digital signal processing in general
44100/2 is max frequency recorder (or any digital device) can record (encode)
or play back (decode)
At least for our purposes
Reason to go higher - get as true to analog as possible. To complete picture of
sound, want to work with higher sample rates. Can't hear it, but psychological
effect?
Bit rate
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