multimedia part 2

Question 1

Multimedia ?

Answer 1

Computer information can be represented through audio, video and animation in addition to traditional media like (graphics)

Question 2

What is animation ?

Answer 2

Pictures are manipulated to appear as moving
images

Question 3

What is frame and frame rate ?

Answer 3

A frame is one of the many still images which compose the complete moving picture

Frame rate : Is the frequency (rate) at which consecutive images called (frames appear on a display )

Question 4

A 20 second 30fps animation, how many frames?

Answer 4

Usually ( > 24 frames/sec -> standard 30)

Question 5

Computer Animation ?

Answer 5

Used in television and movies to create effects
are made with computer- generated imagery (CGI)

Question 6

What is the process of Tweening ?

Answer 6

Process of generating intermediate frames between two key frames (images)
and
to give the appearance that the first image evolves smoothly into the second image

Question 7

what is Digital video ?

Answer 7

Is a series of bitmap images when played back it creates the illusion of movement
Determined by : Frame size : Width x Height (HD) video – 1280 x720
Bit depth and Frames per second (fps)

Question 8

Data compression ?

Answer 8

Encoding information using fewer bits than the original representation.
which can be:
1) Lossless: Original representation can be recovered ( WinZip, Win Rar)

2) Lossy: Recover a representation similar to the original one (more practical) ( high compression ratios)
Throw away less relevant parts of the data
(MP3, JPEG )

Question 9

Digital Audio ?

Answer 9

Using a microphone to capture sound in an analog form (Electric Waves)
Electric wave is converted into digital data by Audio digitizer (ADC)
Has sound :
Sampled ( Digitally recorded ) and Synthesized ( Generated)

Question 10

Synthesizer ?

Answer 10

An electronic instrument
that synthetically generates, creates, produces
example sounds using mathematical formulas

Question 11

Samplers ?

Answer 11

An electronic instrument which instead of generating sounds
It uses recordings (or “samples”) of sounds that are loaded or recorded into it by the user

Question 12

Visualizing a Sound Wave ?

Answer 12

By Repetitive oscillations of vibrations
Like Amplitude , Wavelength and Frequency

Question 13

Digital Sampling ?

Answer 13

An analog audio signal is continuous without
interruption

A digital audio signal is sampled at regular intervals

Question 14

What is Audio Quality ?

Answer 14

It is sampling Rate: Number of samples taken per second (frequency)
Measured in Hertz (Hz)

2) The sample size (Bit Depth)
Bits used to represent a sample which Measured in bits

3) The number of channels
such as : Mono or Stereo

Question 15

Audio Formats ?

Answer 15

WAV ( Uncompressed audio for windows )
MP3 ( 1/10 the size of the original)
WMA ( An alternative to MP3)
AAC ( apple’s alternative to MP3)
OGG Similar to MP3 ( open source and freely available )

Question 16

What is difference between Hypertext and Hyper Media?

Answer 16

Hyper text :
Text which contains links to other texts
Information linked in non-sequential ways

Hypermedia: it’s not constrained to be text-based, it can include other media
Like : combines text, numbers , graphics, animation and music

Question 17

What is Interactive Multimedia ?

Answer 17

Integration of digital media including electronic text, graphics and sound into a
structured digital computerized environment that allows people to interact with the data