Multimedia Study thread (2 Viewers)

[Kd14]

Morphing. A smooth change between two diff images. It transforms the shape, colour, etc of an image to the other. Requires two images.
Example is a pic of a baby transformed into a cat.

Warping. This involves transforming or distorting an image. Requires only one image.
Example is stretching a cheek of a baby.

Q: Compare and contrast between LCD and CRT screens.

 

[jempage]

LCD's and CRT's

An LCD (Liquid Crystal Display) consists of a liquid crystal mix sandwiched between two polarised glass plates. These layers are called substrates. As current is applied to the substrates, light is passed through the crystal mix to create a 'pixel.'

LCD's are light, emit little heat and little EM Radiation, and are a near match to CRT's in clarity, resolution and colour.
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CRT (Cathode Ray Tube) Displays create an image by firing a beam of electrons at a phopsphor-coated screen. The electron beam is directed by an electromagnet, and either scans every second row on the screen (in an interlaced monitor), or every row on the screen (in non-interlaced monitors) from top-to-bottom, left-to-right.

When the electron beam strikes the screen, it causes the phosphor to luminesce in either Red, Green on Blue, the combination of which and brightness of is combined to make different hues and shades.

A CRT is quite larger than an LCD, as it must house the electron picture tube. However, the refresh rate of a CRT is currently higher than an LCD (athough the technology is still being developed), which makes the CRT appeal more to gaming users due to its high response rate and lack of 'ghosting.'

CRT's also emit considerable amounts of heat and EM radiation.

In the time it takes for the luminescence of the phosphor to dissipate, the electron beam has scanned the pixel again, causing it to either dissipate completely (go blank) or giving it a new colour to display.
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QUESTION:

Compare and contrast Animation and Video.

 

[lislabella]

QUESTION: Describe the four areas of expertise involved in creating multimedia systems?

Content and data collection - subject matter experts (graphic artists, researchers, writers, musicians. depending on mode)

Managment - responsible for overall project design, development and completion (project leaders, accountants)

Design and Layout - determine presentation of project, sound, layout etc (graphic artists etc)

Technical - assist in technical implementation. selecting, installing and configuring software and hardware.


NEW QUESTION:
In reference to the digitisation of audio: Define sampling size and sampling rate AND calculate the storage requirments of 2 minutes of CD quality mono sound.

 

[Mat_Aussie]

Video: a data type that combines pictures and sounds, displayed over time

Animation: the movement of a graphic, as in a cartoon, accomplished by presenting a series of still images in rapid succession.

Question:
Compare and Contrast between Hub and Switch

 

[Mat_Aussie]

Sampling Rate: the number of times a sample is taken from the sound wave

Sampling Size: The Number of bits per sample

using the formula

[sampling rate x sampling size x time] x channels

....you kinda forgot to put a sampling size in the question.
lets jst say 16-bit sampling size

= [44100 x 16 x 180] x 1

=127008000 Bits

this equation gives the size in bits

divide by 8x1024 to give in kilobytes
=15503.9 Kb

and divide again by 1024 to give in megabytes
=15.14 Mb

 

[Pace_T]

Sampling Rate: the number of times a sample is taken from the sound wave

Sampling Size: The Number of bits per sample

using the formula

[sampling rate x sampling size x time] x channels

= [44100 x sampling size x 180] x 1

....you kinda forgot to put a sampling size in the question.

this equation gives the size in bytes

divide by 8x1024 to give in kilobytes

and divide again by 8x1024 to give in megabytes

doesnt the equation give it it in bits, then divide by 8x1024 to give kilobytes

to go from kilobytes to megabytes u divide by just 1024 not by both 1024 and 8

 

[melsc]

yep ur right pace

 

[Mat_Aussie]

so its only 1024 not 8x1024

hmm

thanks for that

 

[melsc]

yeh bcoz when something is in bits its x8 to make it bytes anything after that is 1024

hope that clears it up

 

[rama_v]

Question:
Compare and Contrast between Hub and Switch

A switch sends incoming data packets in a network to their precise destination, whereas a hub simply sends data packets to all nodes in the network. A hub is therefore less efficient and less intelligent than a switch, and is mainly used for smaller networks.

New Question:
Define and describe multiplexing

 

[Mat_Aussie]

yeah it does

cheers mate

 

[Mat_Aussie]

Multiplexing:

Combining several signals for transmission on some shared medium (e.g. a
telephone wire).

The signals are combined at the transmitterby a multiplexor and split up at the receiver by a demultiplexor.

The communications channel may be shared between the independent signals in one of several different ways: time division multiplexing, frequency division
multiplexing, or code division multiplexing.

Question:
What are the 4 parts of a data dictionary?

 

[xploda08]

Question:
What are the 4 parts of a data dictionary?

The four parts of a data dictionary are:
- field names
- data width
- data type
- description

BTW: Isnt it suppose 2 b bout Multimedia?

Question: Explain how the development of technology has changed the way multimedia is used.

 

[Lwaxana]

The four parts of a data dictionary are:
- field names
- data width
- data type
- description

BTW: Isnt it suppose 2 b bout Multimedia?

Question: Explain how the development of technology has changed the way multimedia is used.

its field size
NOT data width

 

[Mat_Aussie]

Hey Everyone

What are the 12(i think) social and ethical issues involved in IPT?

dont restrict yourselves to just Multimedia.

 

[vleung]

Sampling Rate: the number of times a sample is taken from the sound wave

Sampling Size: The Number of bits per sample

using the formula

[sampling rate x sampling size x time] x channels

....you kinda forgot to put a sampling size in the question.
lets jst say 16-bit sampling size

= [44100 x 16 x 180] x 1

=127008000 Bits

this equation gives the size in bits

divide by 8x1024 to give in kilobytes
=15503.9 Kb

and divide again by 1024 to give in megabytes
=15.14 Mb

It's still wrong because the question asked for 2 minutes, which is 120 seconds, not 180.

 

[th]

ok what are the issues social and ethical lol

 

[goan_crazy]

ok what are the issues social and ethical lol

privacy
copyright
changing nature of work

meh... I'm not in IPT mode yet
thats next week
another question:
What is the difference between bit mapped and vector graphics?

 

[rawker]

What is the difference between bit mapped and vector graphics?

Bit mapped is images with pixels - vector is lines, circles and shapes.


Identify and explain the design priciples for creatign a multimedia product.

Edit: Just realised that Q has been done! Sorry.

Identify and explain four different screen types.

 

[goan_crazy]

Bit mapped is images with pixels - vector is lines, circles and shapes.


Identify and explain the design priciples for creatign a multimedia product.

consistency-layout has to be constant throughout?
n...
simplicity-design must be simple
i remember by CNS (thanks lwaxana)
forgot the N
I don't know if this is right
arh Im gonna fail IPT

what was the right answer?