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4.1 Digital Multimedia Elements - Coggle Diagram
4.1 Digital Multimedia Elements
Audio
Bit resolution
represent the conversion of an audio signal
Higher number of bits used means more precise the signal is
Sampling rate
number of samples taken each second
measured in
Hz
Higher Sampling Rate means Higher quality
t
he digitized data of music, speech and any kind of audio
signals
Stereo audio
contains two streams of audio signals, known as left sound track and right sound track
Mono audio
contains only one sound track
Uncompressed format
WAV is the most popular type
compressed format
i.e. WAV and MP3
Graphics
Bitmap
Vector graphic
Video
a sequence of full-motion images
together with sound tracks
Frame rate
Number of frames
displayed per second
VCD-PAL and DVD-PAL is 25 fps.
MPEG-4 video played in
PlayStation Portable is 30 fps.
Colour depth
Number of bits used to represent a pixel
VCD / DVD: 24 or 32 bits
Compression
Reducing quantity of data of video clips by
changing the content or the way of representing video frames
VCD: MPEG-1
DVD: MPEG-2
iPod and PlayStation Portable:
MPEG-4
Streaming video on the Internet:
WMV and RealMedia
Duration
Play time of a video clip
No Example
Frame size
Number of horizontal and vertical pixels on each video picture
Frame size for DVD-PAL is 720 × 576 pixels.
Frame size for VCD-PAL is 352 × 288 pixels.