Computer System and Applications Chapter 7 (Telephony:Smartphones and…
Computer System and Applications
Entertainment industry has become all-digital
Technology used to present digital text.
.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.
Convert the sound waves into digital information in order to record digital music.
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.
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.
High speed port move large volume of data.
Cloud service. Apple's IOS
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.
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
Color management software
Digital photo format
Raw uncompressed data (RAW)
Joint Photographic Experts Group (JPEG)
*Transferring file from camera
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
TV , Internet , Hulu , On-demand streaming video are example of digital video.
Digital video-editing software allow user to
edit digital video
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.
Advantages of digital video is that information can be delivered in real time.
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
Base transceiver station
Mobile switching center
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
Bad sound quality
Vulnerable to spywares
The insides of a smartphone
The three main OSes that a smartphone uses are:-
Brains of the smartphones
Stores information and programs
To enable camera usage
For the user to interact with the GUI
Insert flash card
Short message service (SMS)
Up to 160 characters only
Convenient and quick
Uses cell phone network
Multimedia message (MMS)
Newer Technology,Faster Connection
You can track how much data you upload and download
Antivirus softwares to prevent viruses
Virtual Phone number
Ethical Issues of living in the digital age
Copying text or an idea and clamming that as your own.
Users should reference the source if there is any doubt.
Anything designed to deceive another person.
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.
Number of device might find an affordable solution that includes both a very mobile device and a second more powerful one.
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.
Long battery life.
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.
Use a full traditional OS such programs like Microsoft Office.
Has physical keyboard
Weigh 2 pounds or less.
Inexpensive compared with tablets and ultrabooks.
Very thin, lightweight computing solution.
Don't have optical drives.
Offer SSD drives.
Weigh under 3 pounds.
13 to 15-inch screens.
Examples: Apple Macbook Air and Asus Zenbook.
Any information can be digitized
Formatted in a long string of numbers