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Ch. 4 Multimedia Elements and Digitization - Coggle Diagram
Ch. 4 Multimedia Elements and Digitization
Digital Multimedia Elements
Audiobit
Audio files in a computer are the digitized data of music, speech and any kind of
audio signals.
bit resolution
Is the number of bits used to represent the smplitude of an audio signal.
higher the number if bits uesd, the more prescise the amplitude of the audio signal will be.
sampling rate
the higher sampling rate, better the quality of the digital audio will be
Is the number of samples taken each second during the conversion process
Hz
Stereo
Mono
WAV
WMA & MP3
Video
Is a sequence of full-motion images together with sound tracks.
file size very large
Frame size, Frame rate, Duration, Compressio, Colour depth
The higher the frame size and frame rate, the better the video quality and the larger the file size.
AVI is the most popular standard of uncompressed video
MPEG-1, MPEG-2 and WMV are examples of compressed video file formats.
Video files can be compressed into different video file formats for different playback
media.
Graphics
Bitmaps image
pixel
colour depth
Resolution
BMP, JPEG, GIF
Vector graphics
They are composed of a number of objects
can be shape a line or a string of text
Analogue Data and Digital Data
Efficiency on transmission
Accuracy of information
Efficiency in data storage
Replication
Way of measurement
Mode if data access
Efficiency in data analysis
Applications of digital data in IT
All electronic devices including computers and modern data transmission channels
handle data in binary forms
Digital data and computer programs can be represented in sequences
of binary numbers.
This makes operations of electronic devices on digital data such as storge, transmission, manipulation and duplication highly precise and efficient.
Audio & image
sound cord
WAV, MP3, WMA
sampling rate, bit resolution and number of channels
IMAGE
AUDIO
Analogue images such as photographs or printed materials can be converted into
digital images using a scanner
The scanned images are stored as bitmap graphics.
resolution, colour depth and compression ratio
No matter what the scanning settings are, the scanned digital image cannot be the same as the original analogue source.
Video
To capture television programmes into a computer, we need a TV Tuner card to receive TV signals from the antenna.
digital image
video capture
video cassette recorders(VCR), Digital video camera,Web cam and Digital camera
frame size and frame rate and the video compression algorithm
Example of digital video file formats: AVI, MPEG-1, MPEG-2, WMV, MOV, RM
charge-coupled devices(CCD)