Chapter 8- Digital Lifestyle: Managing Digital Data and Devices
A Digital Lifestyle
When did everything go “digital”?
Everything used to be analog
What is special about digital?
Digitized is information that is measured and converted to a stream of numeric
Analog -waves that illustrate the loudness of a sound or the brightness of the colors
in an image at a given moment in time (long continuous waves)
What advantages do digital formats have over analog ones?
Digital formats describe signals as long strings of numbers
Can be reproduced exactly
Can be distributed easily
How can a sequence of numbers express complicated analog shapes?
Analog-to-digital conversion- the incoming analog signal is measured many times
How has the change from analog to digital technologies affected our lifestyle?
New useful capabilities
Small devices holding large amounts of info
Can efficiently interact with info anytime
Digital Technology: Communicating with Bits
Telephony is the use of equipment to provide voice communications overs a
**VoIP (voice over internet protocol)
Cell Phones and Smartphones
What are cell phones and smartphones?
Cellular phone is a telephone that operates over a wireless network. Cell phones
can offer Internet access, text messaging, personal information management (PIM)
features and more
Smartphone is a device that combines the functionality of a cell phone, PMP, and a
PDA into one unit
How do cell phones use digital signals?
Analog-to-digital converter chip converts your voice’s sound waves into digital
Digital signal processor is a specialized chip that processes digital information and
transmits signals very quickly
What’s “cellular” about a cell phone? Order during outgoing call (opposite for incoming call):
1. Base transceiver station is a large communications tower with antennas,
amplifiers, receivers and transmitters
2. Mobile switching center is a central location that receives cell phone
requests for service from a base station
Are cell phones and smartphones considered computers?
Have same components as computers
Input and output devices
Require own OS
What does the processor inside a cell/smartphone do?
1. Coordinates sending all of data among the other electronic components
inside the phone
2. Run’s cell phones OS
Is there a standard OS for cell phones?
OS changes upon cell phone manufacturers
Many smartphones use Windows Mobile OS
Apples iPhone uses OS X that is used in Apple’s personal computers
What does the memory chip inside a cell phone do?
The OS is stored in ROM (permanent)
Full-featured cell phones have as many as 200MB of internal memory
Micro SD flash cards hold up to 32 GB
What input and output devices do cell phones use?
Liquid crystal display (LCD)
OLED (organic light-emitting diode)
What cell phone and smart phone software is available?
To-do list, contact manager, calendar, various games, tools,
Some smartphones include Microsoft Word, Excel, Outlook and PowerPoint
How do I move music from my computer to my smartphone?
Some phones have flash cards that can be put into flash card reader in computer USB connector that connects to USB port on phone
How do I synchronize a cell phone with a computer?
Syncing or synchronizing is known as the process of updating your data so that the
files on your cell phone and computer are the same
To do this place the cell phone in its cradle (or attach to computer with USB cable)
and touch a “sync” button
Can I transfer files wirelessly?
Bluetooth technology uses radio waves to transmit data signals over short
Is there a way to synchronize to my home computer before I get home?
YES, using web services
“Cloud computing” where internet-based services and resources are distributed to
users instead of being installed as an application on the user’s computer
Example, MobileMe from Apple
What is text messaging?
Short message service (SMS) is a technology that allows you to send short text
messages over mobile networks
How does SMS work?
Uses cell phone network to transmit messages
When you send a message:
SMS calling center receives the message and delivers it to the appropriate
mobile device using something called store-and-forward technology
This technology allows users to send SMS messages to any other SMS device
in the world
Can I send and receive multimedia files using a cell phone?
Multimedia message service (MMS) allows you to send messages that include
text, sound, images, and video clips to other phones or e-mail addresses
How do I get Internet service for my smart phone?
Wireless internet service provider (wireless ISP) is needed as well as a data
plan which is known as a connectivity plan or text messaging plan
At what speed is digital information transferred to my smartphone?
At home it is often 50 megabits per second (Mbps)
Two types of smartphones:
1. Enhanced data rate for global evolution (EDGE) 2. 3G
Smartphones with EDGE or 3G can be as fast as 1.4 Mbps
EDGE and 3G are more reliable and less susceptible to interference
4G has speeds of up to 100 Mbps
How can I survive when I find I have no WiFi signal?
MiFi are available free with a new account from major Internet providers like
Version or Sprint
It connects to the Internet through the 3G wireless phone network and then
distributes the WiFi signal over an area of 30 feet
Can support up to 5 WiFi enables devices
“Bluetooth tethering” makes sure your computer can access the Internet
even when it tells you there are no available wireless networks as long as you
have 3G signal
How do smartphones display content from the Internet?
Microbrowser software provides a Web browser that is optimized to display Web
content efficiently on the smaller screen
Ex. Internet Explorer Mobile, Safari on the iPhone, Opera Mobile
Opera Mobile uses special small-screen rendering technology to reformat the
Web images to fit on smartphone screen, then zooms with a special tap
Wireless markup language (WML) is a format for writing content viewed on a
cellular phone or personal digital assistant (PDA) that is text-based and contains no
Can I keep my e-mail up to date using my cell phone?
Blackberry handhelds were the first devices, which were optimized to check e-mail
“Push” technology to automatically deliver e-mail to phone
Can access email through Gmail or Yahoo
Voice over Internet Protocol
How is VoIP different from regular telephone service?
VoIP is a form of voice-based Internet communication that turns a standard Internet
connection into a means to place phone calls, including long-distance calls
What do I need to use VoIP?
Speakers, a microphone, and Internet connection, and a VoIP provider
May need to download a software depending on provider
Ex. Skype, Vonage
What are the advantages and disadvantages of VoIP?
free or low cost
portability, keep in touch with friends and family no matter where you are
Disadvantages: poor sound quality and reliability
loss of service if power is interrupted
911 calls used to be incapable of tracing back to caller
What new features come with having an Internet-based digital phone at
Telephone messages bundled up as emails and sent to your account
Caller ID information available
Cell Phone/ Smartphone Security
Can I get a virus on my cellphone/smartphone?
YES. Cell/smartphones are the next most likely realm of attack by cybercriminals
Antivirus software providers:
Symantec, McAfee, and F-secure
How do I keep my cell/smartphone number private?
Virtual phone number is a phone number you create that can be assigned to ring
on existing phone numbers. Available at tossabledigits.com)
Digital Media and Information
How is digital media created?
1. Playing music creates analog waves
2. Microphone feeds sounds waves into a chip called an analog-to-digital
converter (ADC) inside the recording device
3. ADC digitizes the waves into a series of numbers
4. This series of numbers can be recorded onto CDs and DVDs or sent
5. On receiving end, a playback device like a CD or DVD player is fed that same
series of numbers. A digital-to-analog converter (DAC) converts digital
numbers to a continuous analog wave
6. Analog wave tells the receiver how to move the speaker cones to reproduce
the original waves
Sampling rate specifies the number of times the analog wave is measures each
How can I carry music files easily?
Portable media players (PMPs) are small portable devices that enable you to
carry your MP3 f