Page 114 - Viva ICSE Computer Studies 5 : E-book

• The compressed digital video signals are sent through a transmission medium to the
receiving devices, which are part of the video conferencing system.
• The process is reversed and the video signals are

decompressed at the receiver’s end. Think and Discuss
• The decompressed video signals are continuously
How is video conferencing better
displayed as pictures on output device (such as than teleconferencing?
monitor).

Chatting

In chatting, each participant’s discussions are displayed on the screen of all the others
taking part in a conversation. We can either join an existing conversation or start our

own conversation on any topic. We can discuss topics like sports and health. Nowadays
chatting has become very popular. It can be done using a chat website, a chat room or
an instant messenger.

There are two basic modes of chatting.

• Text-based Chat: This type of chatting enables communication between two or more
users by sending and receiving text messages.

• Video Chat: In video chatting, two or more users can talk to each other through audio
and video transmission over the Internet.

Internet Calling

The user can make free voice and video calls across the world using the Internet. There
are some application software like Skype, Viber and Google Hangouts which provide

the facility of sending free messages and videos along with free Internet calls. To make
these calls, the user needs to install the application on the device and make an account
on it.

E-mail

Electronic mail or e-mail is a method of sending or receiving messages using a computer
that has an Internet connection. E-mail is very fast, usually taking only a few seconds
to reach its destination. It is much useful when you need to send a message to many

people across cities and countries. In addition to the message, you can attach digital
fi les including documents, video clips, music and photos to an e-mail.

Composing and Sending E-mail

E-mail is sent and received through a mail server. The mail server acts like an electronic
‘post offi ce’. Some of the common mail servers are Gmail, Yahoo and Rediff mail. These

servers provide us an address in order to be able to send and receive messages.

102