User Manual

464 | APPENDIX B
Aspect Ratio
Describes the frame size of your video as a ratio of its width to its height. For example, video shot in NTSC DV format has a frame size
of 720 by 480 pixels, which is roughly a 1.33:1 aspect ratio:
720 (frame width) ÷ 480 (frame height) = 1.5
1.5 x 0.9091 (pixel aspect ratio) = 1.36365.
ASIO
ASIO (Audio Stream In/Out)™ is a low-latency driver model developed by Steinberg Media Technologies AG.
Attack
The attack of a sound is the initial portion of the sound. Percussive sounds (drums, piano, guitar plucks) are said to have a fast
attack. This means that the sound reaches its maximum amplitude in a very short time. Sounds that slowly swell up in volume (soft
strings and wind sounds) are said to have a slow attack.
Attenuation
A decrease in the level of an audio signal.
Audio Compression Manager (ACM)
The Audio Compression Manager from Microsoft® is a standard interface for audio compression and signal processing for
Windows®. The ACM can be used by software programs to compress and decompress .wav files.
AVI
A file format of digital video. Vegas Pro software allows you to open, edit and create new .avi files.
Bandwidth
When discussing audio equalization, each frequency band has a width associated with it that determines the range of frequencies
that are affected by the EQ. An EQ band with a wide bandwidth will affect a wider range of frequencies than one with a narrow
bandwidth.
Frame Size Example
4:3 Standard Television
1.33:1 Aspect Ratio
16x9 Widescreen Television
1.78:1 Aspect Ratio
Academy Flat Theatrical Frame
1.85:1 Aspect Ratio
Academy Scope Theatrical Frame
2.35:1 Aspect Ratio