Deck 8: Representing Multimedia Digitally

Question 1

Each pixel on a computer display is formed from red, yellow, and blue colored lights .

Answer 1

False

Question 2

RGB, the name for a color encoding method, is an acronym for Red, Green, Blue .

Answer 2

True

Question 3

All colors with equal intensities of the RGB subpixels are always some shade of gray .

Answer 3

False

Question 4

It requires three bytes to represent the color of a single pixel .

Question 5

Active matrix displays are the standard flat or thin displays used for laptops, phones, and most familiar video applications .

Question 6

An object creates sound by vibrating in a medium .

Question 7

When an object vibrates, the vibrations push the air which causes pressure waves that vibrate our eardrums and, by doing this, create sound .

Question 8

When sound is created in a digital environment, a continuously changing wave (in analog form) is created .

Question 9

Digitizing a sound wave requires that the analog wave be converted to bits .

Question 10

When digitizing sound, a slower sampling rate does not affect the recorded wave because there are some frequencies that the human ear can't hear .

Question 11

To play a digitized sound, the numbers are read from memory into a digital-to-analog converter (DAC) which creates an electrical wave that is input to a speaker .

Question 12

MP3 is popular for Internet transmission because it yields higher quality sound even though this also requires higher bandwidths .

Question 13

The MP3 compression ratio is typically more than 10:1 which means that the number of bits is much greater after compression .

Question 14

Run-length encoding is a lossy compression scheme .

Question 15

In a JPEG, as the amount of compression is increased, the picture eventually begins to pixelate .

Question 16

The way you make the color yellow using paints is similar to the process of creating the color yellow on a computer screen .

Question 17

Higher bandwidth usually means higher latency .

Question 18

Because of its inaccuracy, lossy compression is useless for multimedia files .

Question 19

The Bias-Free Universal Medium Principle states that bits can represent any discrete information .

Question 20

A digitization guideline which states that the sampling frequency should exceed the signal frequency by at least a multiple of two is the

A) Analog-Digital rule
B) Sample rate rule
C) Leibniz rule
D) Nyquist rule

Question 21

The decimal number 174 is equivalent to binary

A) 1010 1110
B) 1101 1010
C) 001 1101 1100
D) 1110 1111

Question 22

Digitizing sound

A) requires lossless compression techniques
B) is compressed using MPEG
C) achieves perfection using an unlimited number of bits
D) uses bits to represent both positive and negative values

Question 23

GIF encoding

A) can display 1024 different colors
B) is a lossless encoding scheme
C) is used for photographs
D) was invented by the Joint Photographic Experts Group of the ISO

Question 24

Which of the following statements is NOT correct?

A) OCR systems can easily interpret words created by reCaptcha .
B) OCR can be used to read the handwritten digits on checks .
C) OCR's business applications include sorting mail and banking .
D) OCR is a very sophisticated technology .

Question 25

The meaning of bits depends on

A) their inherent meaning
B) the principles applied by the transmission medium
C) the ability to perform analog-to-digital conversion
D) the interpretation placed on them by computer programs

Question 26

Adding a positive number to each component of each pixel in an image will

A) brighten the image
B) darken the image
C) improve the contrast of the image
D) turn the image black

Question 27

The quality of a sound recording is determined by the ________ and the sample precision .

A) bit width
B) sample speed
C) sample rate
D) notification rate

Question 28

To search for a word in a picture, pixels must be converted to

A) reCaptcha
B) text
C) bits
D) analog

Question 29

If we want a subpixel to be of half intensity, we use

A) 0000 1111
B) 1111 0000
C) 1000 0000
D) 1100 0000

Question 30

Assume you have a scanned black and white photo and the subpixels had values of 195 each . You want the image's pixels to all be nearer intense white while keeping their relative relationships . Which of the following could the subpixels be changed to?

A) 212, 212, 212
B) 0, 0, 0
C) 0, 179, 212
D) 179, 179, 179

Question 31

Select all that apply . Digitized sound

A) can be reproduced exactly
B) can be processed to reduce the number of bits
C) can be fixed by removing offending noises
D) can be considered a synonym for analog sound

Question 32

________ refers to how close to white the pixels in a color are .

Question 33

Small points of colored light arranged in a grid to form a computer display are called ________ .

Question 34

The brightness of the light of a subpixel in an LCD display it its ________ .

Question 35

When all three lights (subpixels) are turned on at high intensity, this results in ________ .

Question 36

To ________ means to take measurements at regular intervals, as in sound digitization .

Question 37

The factor by which compression reduces an encoding from its uncompressed size is known as the ________ .

Question 38

The process of reducing the number of bits required to represent information from which the original form can be exactly reconstructed is known as ________ compression .

Question 39

The process of reducing the number of bits required to present information from which the original form cannot be exactly reconstructed is known as ________ compression .

Question 40

The compression scheme of the Motion Picture Experts Group of the ISO is ________ .

Question 41

A measure of how much information is transmitted per unit time is the ________ .

Question 42

The time required to deliver or generate information is ________ .

Question 43

The Nyquist rule requires that, to capture frequencies up to 17,000 Hz, you must sample at a rate of at least ________ Hz .