4.5 Sound And Image Representation

Question 1

How many bits in a byte?

Answer 1

8

Question 2

How many bytes in a kilobyte?

Answer 2

1000

Question 3

How many bytes in a kibibyte?

Answer 3

1024

Question 4

What is metadata?

Answer 4

Metadata is the data before the data - it declares information such as the dimensions or the bit depth

Question 5

What is a pixel?

Answer 5

A pixel is the smallest addressable area of an image

Question 6

What are bitmapped images comprised of?

Answer 6

Bitmapped images are comprised of pixels arranged into rows and columns

Question 7

What are vector graphics comprised of?

Answer 7

Vector graphics are comprised of mathematical functions that make up shapes placed on top of each other in order to construct images.

Question 8

What is the size of a bitmapped image often referred to as?

Answer 8

The resolution

Question 9

What is color depth?

Answer 9

Color depth is the number of bits used to represent each pixel.

Question 10

How does the color depth affect the size of a bitmap image

Answer 10

The larger the color depth the larger the file size.

Question 11

Describe how you would calculate the file size of a bitmap image

Answer 11

Height in pixels * Width in pixels * color depth

Question 12

What device is used between the microphone and the computer so that audio can be recorded?

Answer 12

An Analog-Digital Converter (ADC)

Question 13

What is the purpose of an ADC?

Answer 13

It allows the computer to interpret the analog signal in binary form as computers can only interpret digital signals (True or False)

Question 14

What is the purpose of sampling?

Answer 14

Sampling allows the computer to test audio at a constant rate so that it can be stored for use later

Question 15

What is the sample rate measured in?

Answer 15

Hz (samples per second)

Question 16

What is the sample resolution?

Answer 16

Sample resolution is the number of bits per sample

Question 17

Describe how you would calculate the size of an audio file

Answer 17

File size (bits) = rate x res x secs
rate = sampling rate
res = sample resolution
secs = number of secon