Question

Q4. (a) Explain the difference between multimedia and streaming media.

(b) Explain with the help of a well labelled diagram the general principle behind error detection in communication networks.

Answer 1

a.

Multimedia : It is computer information in the form of Audio, Video, Animations including traditional media types such as text, images, graphics.

It is in digital form and stored, processed and transmitted in this form.

Streaming Media : is a type of multimedia in which media is sent in the form of audio or video, continuously over the internet. There is no permanent storing or downloading option for storing this content in legal way. The media can be paused, rewinded, or played again while its in procession.

b.

Types of Error Detection:

1. Simple Parity Check: A block of data coming from source is exposed parity bit generator where: 1 is added if information contains odd number of 1's and 0 is added if number of 1's is even.

This makes number of 1's even.

2. 2 dimensional Parity Check:

2 D because parity bits are calculated for each row as well as column.

3. Cyclic redundancy check:

Its basis is binary division. A series of redundant bits are added to end of data unit which results in data unit divisible by second binary number. At Reciever, the received data unit is divided by the same number, and its correct form depends on remainder. If no remainder, then no fault in data. If remainder then data is damaged.