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Computer System and Applications Chapter 7 (Telephony:Smartphones and…
Computer System and Applications
Chapter 7
Digital Media
:
Entertainment industry has become all-digital
Digital Publishing
Electronic text
E-reader
Technology used to present digital text.
Electronic Ink
Backlit Monitors
Digital format
.azw used by amazon
ePub an open format
Library including e-book for rent.
Overdrive Media Console search the book are available in which libraries.
Project Gutenberg is a great source for free reading.
Digital publishing makes self-publishing more easier.
Digital Music
Convert the sound waves into digital information in order to record digital music.
Sampling Rate
Higher sampling rate, more accurately original wave can be created.
Depends on the output device.
Sample of digital music formats: MP3 , AAC , WMA.
The higher the sampling rate, the larger the file size.
Ripping Song
Users get to select the sampling rate.
Storage of the player.
If there isn't enough space, some device that use flash memory allow users to add storage by purchasing flash memory cards.
Subscription Plans
Spotify
Google Play
High speed port move large volume of data.
USB
Cloud service. Apple's IOS
Listening Options
Ports
Streaming
Auxiliary service
Speaker docks
Tethered downloads
Pay for music and own it.
DRM-free music allows only limited use of material.
Digital music allows artist to release song immediately and more convenient.
Digital Photography
Digital Camera
Capture images
Convert to digital data
Record digital video
When choosing camera , consider about "point-and-shoot" and digital SLR.
Digital Photography Review help users compare.
Factors that determine quality
Quality of lenses
Image sensor size
File format and compression
Resolution
Color management software
Digital photo format
Raw uncompressed data (RAW)
Joint Photographic Experts Group (JPEG)
Smartphone camera
*Transferring file from camera
USB port
Flash Card
Wireless network
Scanners
Turn photos into a digital file
Scan film negatives and slides
Quality measured by resolution
Optical Character Recognition(OCR) convert pages or typed text into electronic files that can be edited by word processing software.
Sharing and Printing Digital Photos
Facebook
Picasa
Photo printer
Photo-printing service
Digital Video
TV , Internet , Hulu , On-demand streaming video are example of digital video.
Digital video-editing software allow user to
edit digital video
,
review clips
,
reorder segments
,
correct color , balance ,brightness or contrast
Example of digital video-editing software are :
:check: Adobe Premiere Elements
:check: Pinnacle Studio HD
:check: Adobe Encore
Webcasting is the quickest way to get the video content out.
HD is a standard that guarantees a specific level of resolution and aspect ratio.
HDMI connectors
Advantages of digital video is that information can be delivered in real time.
Digital Convergence:
The ability to be able to view the same multimedia content from a different type of device
For example,most TV nowadays can connect to your computer,game console or your DVD player.Unlike the olden days, TVs were only able to display content using their built-in antennas
Telephony:Smartphones and Beyond
:
The use of equipment to provide voice communication over a distance
How cellphone technology works
Cellular network
Base transceiver station
Mobile switching center
Digital Processing
Sound enters microphone
Analog-to-digital converter chips converts voice into digital signals
Digital signal processor compresses the signal
Digital daa is transmittted as a radio wave
Digital signal processor decompresses incoming message
Amplifier boosts signal
VoIP(Voice over Inter Protocol)
Technology used similar to email
Digital Phone Service
Internet Access is required
Free or low-cost log-distance calling
Portability
Softwares
Skype
Vonage
Drawbacks
Bad sound quality
Unstable reliability
Vulnerable to spywares
Smartphone Basics
The insides of a smartphone
Operating Systems
The three main OSes that a smartphone uses are:-
Android
iOS
Windows Mobile
Components:-
LED display
CPU
Brains of the smartphones
Memory
Stores information and programs
Camera Module
To enable camera usage
Audio interface
Input/Outputs audio
Battery
Touch-screen display
For the user to interact with the GUI
Syncronize data
Wired
USB Port
Insert flash card
Wireless
Google Sync
Dropbox
Amazon Kindle
Text Messaging
Short message service (SMS)
Short messages
Up to 160 characters only
Convenient and quick
Uses cell phone network
Multimedia message (MMS)
Mobile Internet
Cellular Network
3G Network
4G Network
Newer Technology,Faster Connection
WiFi
Internet Usage
You can track how much data you upload and download
Alternative connections
Mobile hotspot
MiFi Devices
Smartphone security
Antivirus softwares to prevent viruses
Kaspersky
Mcafee
F-Secure
Virtual Phone number
Ethical Issues of living in the digital age
Plagiarism
Copying text or an idea and clamming that as your own.
Users should reference the source if there is any doubt.
Hoaxes
Anything designed to deceive another person.
Digital Manipulation
Involve altering media from the way they were originally seen.
Tablets,Netbooks and Ultrabooks
Making a choice to determine what fits your personal needs
Screen size and style of keyboard will determine how you interact with your device.
Weight
Number of device might find an affordable solution that includes both a very mobile device and a second more powerful one.
Tablets
Light, very portable devices.
Screen size between 7 and 10 inches. The lager virtual keyboard and higher resolution.
It has operating system.
Has a processors.
Touch-screen interfaces.
Long battery life.
Software applications.
Internet connectivity.
Can be connected over bluetooth
Can place audio or video phone calls.
Apps that is available to allow tablets to handle texting such as HeyWire.
Netbooks
Use a full traditional OS such programs like Microsoft Office.
Has physical keyboard
Weigh 2 pounds or less.
Inexpensive compared with tablets and ultrabooks.
Ultrabooks
Full-featured computers.
Very thin, lightweight computing solution.
Don't have optical drives.
Offer SSD drives.
Weigh under 3 pounds.
Full-size keyboards.
13 to 15-inch screens.
Examples: Apple Macbook Air and Asus Zenbook.
Digital Defined
Analog-to-digital conversion
Any information can be digitized
Formatted in a long string of numbers