Going digital

April 17, 2023

http://en.wikipedia.org/wiki/File:Compact_disc.svg

Blu ray Versus DVD

•Storage capacity:–DVD: 4-8 GB–BD: 25-50 GBWHY?

Read pages 170-172

Analogue and digital

10000 1000 100 10 1 1/10 1/100 1/1000

1 5

104 103 102 101 100 10-1 10-2 10-3

1 5

104 103 102 101 100 10-1 10-2 10-3

1 5

25 24 23 22 21 20 2-1 2-2 2-3

104 103 102 101 100 10-1 10-2 10-3

1 5

25 24 23 22 21 20 2-1 2-2 2-3

1 1 1 1

Let’s try some binary numbers!

010001011101001001011011010010010000101110100100110110100100101010101010101010101001000101111010101010101010010011010010010110100101011010010011010010100100110101000100100010100101101010010100101001010010010100101010010100101001010010100001010001011101001001011011010010010000101110100100110110100100101010101010101010101001000101111010101010101010010011010010010110100101011010010011010010100100110101000100100010100101101010010100101001010010010100101010010100101001010010100001

7

9

11

12

13

14

14

15

15

15

7 0 1 1 1

9 1 0 0 1

11 1 0 1 1

12 1 1 0 0

13 1 1 0 1

14 1 1 1 0

14 1 1 1 0

15 1 1 1 1

15 1 1 1 1

15 1 1 1 1

01111001101111001101111011101111

7 0 1 1 1

9 1 0 0 1

11 1 0 1 1

12 1 1 0 0

13 1 1 0 1

14 1 1 1 0

14 1 1 1 0

15 1 1 1 1

15 1 1 1 1

15 1 1 1 1

Advantages of digital signals

• Digital signals can be handled by microprocessors in computers

• Carry more information every second

• Delivered with no loss of quality

Now let’s have ago at questions 1-3