Lecture 2 - Data Representation

Question 1

What are the two states of a transistor?

Answer 1

Charged and un-charged. We represent this with 0s and 1s

Question 2

What is the base of the binary system?

Answer 2

2

Question 3

What is the base of the decimal system?

Answer 3

10

Question 4

What is meta data?

Answer 4

Data that explains what the data itself holds.

Question 5

An image is nothing but a grid of _____.

Answer 5

pixels

Question 6

How many bits does it take to represent one color?

Answer 6

8

Question 7

How many colors is a pixel made up of?

Answer 7

3

Question 8

What 3 colors is a pixel made up of?

Answer 8

Red Green Blue

Question 9

What is Black in RGB?

Answer 9

RGB(0,0,0)

Question 10

What is white in RGB?

Answer 10

RGB(255,255,255)

Question 11

What is brightness?

Answer 11

How close to white each pixel is in the picture

Question 12

What is contrast?

Answer 12

Distance between the whitest and blackest pixels?

Question 13

How is sound represented?

Answer 13

As a continuous wave

Question 14

How is a sound wave sampled?

Answer 14

It is dissected into sections and then the curve is calculated between midpoints so that the analog data is reconstructed from discrete points throughout time

Question 15

What is rate in sound?

Answer 15

The number of samples per second

Question 16

What is the resolution in sound?

Answer 16

The number of bits per sample

Question 17

To increase the accuracy of a sound sample we must increase the amount of _______.

Answer 17

bits

Question 18

How do you calculate the file size of a song?

Answer 18

(RateResolutionTime)/8 bytes

Question 19

What problem does compression attempt to solve?

Answer 19

Representing the same information while taking up less space

Question 20

What is lossless data?

Answer 20

All the compressed information can be 1005 recovered

Question 21

What is latency?

Answer 21

Lag