The document discusses digital technology and how computers use binary digits (bits) represented as 0s and 1s instead of decimal digits. It explains how bits are grouped into bytes for storage and transmission of data. A key aspect is how analog signals, like sound, are converted to digital formats by sampling the signal at regular intervals and assigning a numeric value to the amplitude, allowing perfect reproduction when reconstructed. This digital format is how technologies like CDs store vast amounts of high-fidelity audio with a very high sampling rate of 44,100 samples per second.

1. Digital technology 14.1 and 14.2

2. What are binary digits? Computers use binary numbers, and therefore use binary digits in place of decimal digits. The word bit is a shortening of the words " B inary dig it ." Whereas decimal digits have 10 possible values ranging from 0 to 9, bits have only two possible values: 0 and 1.

7. Analog at a glance As a technology, analog is the process of taking an audio or video signal (in most cases, the human voice) and translating it into electronic pulses. Digital on the other hand is breaking the signal into a binary format where the audio or video data is represented by a series of "1"s and "0"s.

12. An analog wave Analog Wave What is it that the needle in Edison's phonograph is scratching onto the tin cylinder? It is an analog wave representing the vibrations created by your voice. For example, here is a graph showing the analog wave created by saying the word "hello": Image from www.howstuffworks.com

26. APPLICATION -COMPACT DISCS (CD’S)

35. APPLICATION -COMPACT DISCS (CD’S)

38. A CD’s pits and bumps