CSC 121 - Final Exam Study Guide Questions & Answers
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Course
CSC 121
Institution
CSC 121
Sounds - ANSWERInherently analog values with specific amplitudes and frequencies
Analog Sound Waves - ANSWERContinuous sound waves are created in response to vibrations in the surrounding air, such as a drumstick hitting a drum pad (Must be converted to a sequence of discrete values)
Digital ...
CSC 121 - Final Exam Study Guide
Questions & Answers
Sounds - ANSWERInherently analog values with specific amplitudes and frequencies
Analog Sound Waves - ANSWERContinuous sound waves are created in response to
vibrations in the surrounding air, such as a drumstick hitting a drum pad (Must be
converted to a sequence of discrete values)
Digital Sampling - ANSWERA process In which the amplitude of a wave is measured at
regular intervals and stored as discrete measurements
MP3 player - ANSWERIntroduced in 1993 - uses techniques to reduce file size by 75-
95%. Lossy format.
CD Player - ANSWERIntroduced in 1982. Before then, music piracy was almost non-
existent
Images - ANSWERInherently analog
Resolution - ANSWERThe sharpness or clarity of an image
Grayscale Image - ANSWEREach pixel is a shade of gray - somewhere between black
and white. The image formats 8 bits for a grayscale pixel--256 shades of gray and 8x
storage of black and white
Color Images - ANSWERGets broken into red, green, & blue components on a 0-255
scale. 16,777.216 different color combinations can be represented. Require 3x storage
of grayscale, and 24x the storage of black and white
Color Bit maps - ANSWERCan be extremely large, 12 megapixel image-12 million
pixels-26 MB of storage
GIF - ANSWERa lossless format (No info is lost in the compression) for image files that
support both animated and static images. 25-50% reduction possible
PNG - ANSWERA more modern, lossless alternative to GIF - more colors. 10-50%
smaller than GIF (33-75% reduction from bitmap)
JPEG - ANSWERA lossy format, so the compression is not fully reversible (but more
efficient) 90-95% reduction is possible
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