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What is the difference between the digital and analog signals? Give examples.
A Digital represents data using binary (1 and 0)
-Example: FM Radio wave or vinyl record
An Analog signal can easily pick up interference and lose quality over time.
-Example: MP3 File or DVD
How is data restored for analog and digital data?
For analog it's hard to fix because of the signals getting all messed up. Imagine trying to fix a crumpled piece of paper, you can try but its never going to look the same.
For digital it's easier to fix because it's just 1's and 0's. If something gets messed up, you can usually fix it. It's like having a book, if one page gets torn, you can replace it either with another page or another book. There's many options!
What is noise?
An unwanted modification of a signal. The more noise around you the harder it is to share and receive a signal.
What is binary?
A system of numbers that are 1 and 0. It's the language that the computers use. Each 0 or 1 is called a bit (binary digit). When you put them together, they form bigger pieces of data, like 8 bits make a byte. Binary is basically a switch from on to off.
What is the pattern for each type of signal?
Analog:
-smooth and continuous
-any value within any range
-looks like a wavy line
Digital:
-jumps between levels
-has only two values (1 and 0)
-looks like sharp square steps
How do we make binary numbers represent letters?
To represent letters, we use a system called ASCII (American Standard Code for Information). Each letter has a binary number. Every character is given an 8 bit (1 byte) binary number. This is why we use 8 bits to represent each letter or symbol.
What is the difference between transmit and receive?
Transmit is sending signals or data from one place to another and receive is picking up or getting that signal or data.
What is the definition of binary numbers?
A signal to or from a computer is encoded in binary numbers such as the two values on (1) and off (0).
What happens to digital and analog signals over time?
Both signals can degrade over time.
Analog: hard to recover once gone, once details get lost tape is fuzzy, signal weakens and picks up more noise.
Digital: less affected by noise, can still degrade, easy to renew.