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CSC 121 - Final Exam Study Guide 2024/2025 Questions With Completed & Verified Solution.
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CSC 121 - Final Exam Study Guide 2024/2025 Questions With Completed & Verified Solution.
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CSC 121 - Final Exam Study GuideSounds - ANS Inherently analog values with specific amplitudes and frequencies
Analog Sound Waves - ANS Continuous 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 - ANS A process In which the amplitude of a wave is measured at regular
intervals and stored as discrete measurements
MP3 player - ANS Introduced in 1993 - uses techniques to reduce file size by 75-95%. Lossy
format.
CD Player - ANS Introduced in 1982. Before then, music piracy was almost non-existent
Images - ANS Inherently analog
Resolution - ANS The sharpness or clarity of an image
Grayscale Image - ANS Each 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 - ANS Gets 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 - ANS Can be extremely large, 12 megapixel image-12 million pixels-26 MB of
storage
GIF - ANS a lossless format (No info is lost in the compression) for image files that support both
animated and static images. 25-50% reduction possible
PNG - ANS A more modern, lossless alternative to GIF - more colors. 10-50% smaller than GIF
(33-75% reduction from bitmap)
JPEG - ANS A lossy format, so the compression is not fully reversible (but more efficient)
90-95% reduction is possible
Steganography - ANS Practice of hiding a secret message in plain sight within another message
or object
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