Portable Applications.

a) What is a portable application?

portable - carried or moved with ease
app - a computer program like a web browser or word processor
A portable app is a computer program that you can carry around with you on a portable device and use on any Windows computer. When your USB flash drive, portable hard drive, iPod or other portable device is plugged in, you have access to your software and personal data just as you would on your own PC. And when you unplug the device, none of your personal data is left behind.

b) The advantages of portable applications?

A portable app works from any device (USB flash drive, portable hard drive, iPod, etc)

A portable app works as you move computers and your drive letter changes

A portable app's features continue working as you move computers

A portable app doesn't leave files or folders behind on the PC

A portable app doesn't leave registry entries behind except those automatically generated by Windows

A portable app is optimized for use on removable drives

A portable app doesn't require additional software on the PC

A portable app doesn't interfere with software installed on the PC

Your favorite web browser with all your bookmarks close at hand

Your presentation AND the required software ready to go for that big meeting

Your important passwords and account information securely encrypted and always with you

Your antivirus program and other utilities ready to fix PC problems

Your calendar with all your appointments

Your own email client with all your contacts and settings

Your instant messenger and your buddy list

Your whole office suite along with all your documents

Audio Bit Depth, Sample Size and Sampling Rate

2. What unit is used to measure sample size?
 Essentially this is the number of digits in the digital representation of each sample. Think of the sample rate as the horizontal precision of the digital waveform

3. What unit is used to measure sampling rate?
The rate at which the samples are captured or played back, measured in Hertz (Hz), or samples per second.

4. Compare the quality of AM, FM and digital radio?

• 32 kbit/s – MW (AM) quality
• 96 kbit/s – FM quality
• 192 kbit/s – DAB (Digital Audio Broadcasting) quality

Digital audio broadcasting is better quality as it's 192 kbit/s which is alot better than AM and FM's quality.

Audio Bit Depth Sample Size and Sampling Rate.

1. Sound moves through what medium?
Sound moves through air. Sounds are pressure waves of air. If there wasn't any air, we wouldn't be able to hear sounds. There's no sound in space so if you you were in space you would be able to see another spaceship explode but you wouldn't be able to hear it because there is no air present but if part of the spaceship hit yours you would hear it because of the vibrations. We hear sounds because our ears are sensitive to these pressure waves.
We are able to hear sound through glass coming from another room because the air pushes against the glass which causes vibrations which then moves the air in the room you're in allowing you to hear because of the movement of air.
When you clap your hands, the air that was between your hands is pushed aside. This increases the air pressure in the space near your hands, because more air molecules are temporarily compressed into less space. The high pressure pushes the air molecules outwards in all directions at the speed of sound, which is about 340 meters per second. When the pressure wave reaches your ear, it pushes on your eardrum slightly, causing you to hear the clap.

A hand clap is a short event that causes a single pressure wave that quickly dies out. The image above shows the waveform for a typical hand clap. In the waveform, the horizontal axis represents time, and the vertical axis is for pressure. The initial high pressure is followed by low pressure, but the oscillation quickly dies out.