introduction to digital media. what is it? digital media is what computers use to; store, transmit,...
TRANSCRIPT
![Page 1: Introduction to Digital Media. What is it? Digital media is what computers use to; Store, transmit, receive and manipulate data Raw data are numbers,](https://reader035.vdocuments.us/reader035/viewer/2022062321/56649f255503460f94c3bf07/html5/thumbnails/1.jpg)
Introduction to
Digital Media
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What is it?
• Digital media is what computers use to;
• Store, transmit, receive and manipulate data
• Raw data are numbers, characters, images, sound – elements that when we put enough together it becomes meaningful
• When data is arranged meaningfully, it becomes (to us) information
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Digital Media
• Is what is ‘made’ or ‘produced’ electronically and stored in a file.
• Sound, text, numbers, images and video are the most common forms we use
• Digital media is stored in a simple way by a computer – using a number system called Binary.
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Binary
• Humans like to use DECIMAL number systems.
• 0,1,2,3,4,5,6,7,8,9
• 10 digits
• Computers use the BINARY system
• 0 or 1
• 2 digits only
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Why Binary
• Computers are very simple things. They use electricity to work. To a computer, there are only 2 options.
• Off or On
• Electricity is there, or it is not there
• They use 1 to mean – YES, electric current
• 0 means – NO, no electric current
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Computer Brains
• Digital media is stored and used using Memory Cells, there are millions of tiny cells in their memory.
• Each cell either has an electrical charge (1)
• Or it doesn’t have one (0)
• So all digital media is made up of a series of 0s and 1s. Nothing else.
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Binary Strings
• Right now, just remember that all digital media is represented in a computer as a long line of 0s and 1s.
• So a computer is a very simple thing really.• These 1s and 0s are stored as a STRING• A STRING is just a line of 0s and 1s.• A 16 bit computer uses a STRING of 16 zeros and
ones.• 0011 0010 0000 0001 – this is a STRING of DATA
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Data Handling
• All text, images, sound, video can be handled in DIGITAL MEDIA by BINARY STRINGS.
• We call it DIGITAL from the word DIGIT
• A DIGIT can be a 0 or a 1
• Computers can process millions of digits every second. That all your processor does!
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Analogue vs Digital
• We don’t live in a world of 0s and 1s.• Our world has infinate colours and sounds• Imagine you paint a picture. You use a
brush and paint. You create colours and brush strokes to paint your masterpiece.
• You don’t much care how many colours you created on your picture. An infinate number probably … like this.
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The original painting is made from millions of colours that all blend together.
This is called ANALOGUE.
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A VHS tape is ANALOGUE, it uses MAGNETIC forces to store information.
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A DVD uses DIGITAL storage. 1s and 0s, binary code to store data and information
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Analoge vs Digital
• Which looks better – VHS or a DVD?
• Which sounds better – a cassette tape or a CD?
• What happens if you copy a VHS tape, then copy the copy and then copy the copy of the copy?
• What if you do the same with a DVD?
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Analogue vs Digital
• Often with ANALOGUE, each time you copy it, there is a reduction in quality.
• That’s because you are trying to ‘copy’ an almost infinate number of possibilities from one ‘variable’ media to another.
• Not surprising that it’s almost impossible to make a copy that’s the same as the original.
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If you used paint and a brush, how easy would it be to copy this EXACTLY?
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Digital Media
• It’s a lot easier to deal with a media that is made up of not millions of possibilities, but just 2 – BINARY
• Digital media can be copied with NO loss of quality.
• Every copy is going to be the same!
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Converting
• Computers need a way of getting ‘data’ and ‘information’ from the real (ANALOGUE) world into their DIGITAL world
• Turning millions of possibilities into a series of 0s and 1s – BINARY.
• This process is called DIGITISATION.
• Once we do this, computers can use it.
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Where do you put the analogue information?
What kind of analogue information does this device ‘digitises’.
What is the device called?
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What kind of analogue information does this device ‘digitises’.
Where do you put the analogue information?
What kind of ‘digitising’ device is this?
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MIDI MusicIf we don’t digitise ‘sound’ then the only way to make music, is to create a program that can read digital data and then output sound. MIDI music is pure digital… why it sounds so great.
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Converting
Sound• We digitise ‘sound’. We take an analogue
input (microphone) and convert the signal into a digital one.
• CDs are digital, and the sound on them is just 0s and 1s that your CD Player (which has a simple processor in it) turns into sound using your speakers
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Sound Formats
• CDs hold 700mb of BINARY data(ish)
• Sound is stored in a WAV format
• The WAV format is a ‘known’ way in which we store the STRING of 0s and 1s.
• The CD player recognises the PATTERN and can interpret the code to produce music using speakers.
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01010101010101000
Device
Digital inputAnalogueOutput
CD
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Sound Formats
• Why can’t a CD Player play MP3 sound files if you save them on a CD – it’s all BINARY?
• Because the STRING of DIGITAL DATA is in the MP3 format, which is quite different from a WAV format.
• MP3 uses less 0s and 1s to store any given song than WAV does
• Your CD player is not ‘programmed’ to understand WAV format, so does nothing.
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More reasons to go digital!
• Digital files are easily transmitted and received. Email is faster than writing and sending an analogue letter!
• Digital files can be stored easily and retrieved easily. Much faster than an analoge filing cabinet!
• You can ‘manipulate’ digital files – especially images, video and sound!