Wednesday, February 18, 2009

Digital Media

1· First off let see if we can list how many forms of digital media surround us (you should be able to come up with at least 5).

Cellphones
Compact disc
Digital video
Digital television
e-book
I
nternet
Minidisc
Video game
World Wide Web
I
nteractive media

2· What number system is digital data based on? What two digits are used to code all digital data?

As opposed to analog data, digital data is in many cases easier to manipulate, and the end result can be reproduced indefinitely without any loss of quality.

What is a bit? What is a byte?

A bit, short for binary digit, is the smallest unit of measurement used for information storage in computers. A bit is represented by aaa 1 or aaa 0 with aaa value of true or false, sometimes expressed as on or off. Eight bits form aaa single byte of information, also known as an octet. Thus, the difference between a bit and aaa byte is size, or the amount of information stored.

What is “sampling rate”? Find an image that explains how sampling works (Wikipedia is a good resource here…you can place these images in your blog)

The sampling rate, sample rate, or sampling frequency defines the number of samples per second (or per other unit) taken from a continuous signal to make a discrete signal. For time-domain signals, it can be measured in hertz (Hz). The inverse of the sampling frequency is the sampling period or sampling interval, which is the time between samples.

How does Colour Depth (Color Depth) or bit depth effect the appearance of an image? Find some images to illustrate the effect.

Color depth or bit depth, is a computer graphics term describing the number of bits used to represent the color of a single pixel in a bitmapped image or video frame buffer. This concept is also known as bits per pixel (bpp), particularly when specified along with the number of bits used. Higher color depth gives a broader range of distinct colors.

Colour depth effects both still and video digital media. Sampling rate only effects video but not still media. Can you explain.

NO.