Studied by 2 people
data
basic values or facts
information
data that has been organized or processed in a useful manner
multimedia
several different media types
data compression
reducing the amount of space needed to store a piece of data
bandwidth
the number of bits or bytes that can be transmitted from one place to another in a fixed amount of time
compression ratio
the size of the compression data divided by the size of the uncompressed data
lossless compression
a data compression technique in which there is no loss of information
lossy compression
a data compression technique in which there is a loss of information
analog data
a continuous representation of data
digital data
a discrete representation of data
digitize
the act of breaking information down into discrete pieces
pulse-code modulation
variation in a signal that jumps sharply between two extremes
reclock
the act of reasserting an original digital signal before too much degradation occurs
signed-magnitude representation
number representation in which the sign represents the ordering of the number (negative and positive) and the value represents the magnitude
ten's complement
a representation of negative numbers such that the negative of I is 10 raised to a minus I
overflow
a situation where a calculated value cannot fit into the number of digits reserved for it
radix point
the dot that separates the whole part from the fractional part in a real number in any base
floating point
a representation of a real number that keeps track of the sign, mantissa, and exponent
scientific notation
an alternative floating-point representation
character set
a list of the characters and the codes used to represent each one
keyword encoding
replacing a frequently used word with a single character
run-length encoding
replacing a long series of a repeated character with a count of the repetition
Hoffman encoding
using a variable-length binary string to represent a character so that frequently used characters have short codes
pixels
individual dots used to represent a picture; stands for picture elements
resolution
the number of pixels used to represent a picture
raster-graphics format
storing image information pixel by pixel
vector graphics
representation of an image in terms of lines and shapres
video codec
methods used to shrink the size of a movie
temporal compression
movie compression technique based on differences between consecutive frames
spatial compression
movie compression technique based on the same compression techniques used for still images
Note
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