It's another brand new
week!!!!
A new day brings new
hope. So live the day to the fullest and hope to God that there's another
day awaiting you. J
The topic for today was
wireless technology. In this context, Dr Dayang taught us what is the real definition for bluetooth.
Bluetooth
Bluetooth has becomes a part of our life now. However, all of you may wonder how exactly it
works….So, here you go…. XD
How bluetooth work:
It utilizes a radio
based, that means it does not require a line of sight connection in order to
communicate.
2 bluetooth equipped
devices simply have to come within 10 meter range of each other.
A device must request a
connection either to accept or reject.
Concept:
Point to point and
point to multiple connection with small network called piconets.
Each piconets hold up 8
active units.
When multiple
network exist within the same room they become known as scatternet.
To resist
interference bluetooth employs spread-spectrum technique called frequency
hoping.
Frequency hoping means
several devices will be ON the same frequency at the same time.
Bluetooth
and the future
The future of Bluetooth looks strong, with initiatives underway for
higher throughput, more ubiquitous usage and
links with Wifi and Ultra
Wideband (UWB) broadcast technology.
The Bluetooth SIG partners are working on enabling Bluetooth information
points, to enable advertising models based around users pulling information
from ‘information points’, rather than having to ‘push’ information out.
Other emerging
features include Bluetooth in cars; automatic configuration of piconets; and
quality of service (QoS) improvements, for example enabling audio and video
data to be transmitted at a higher quality.
Broadband
The term broadband refers to a telecommunications signal
or device of greater bandwidth, in some sense,
than another standard or usual signal or device (and the broader the band, the
greater the capacity for traffic).
How
is broadband different from dial-up service?
·
Broadband service provides higher-speed of
data transmission. It allows more content to be carried through the
transmission “pipeline.”
·
Broadband provides access to the highest
quality Internet services—streaming media, VoIP (Internet phone), gaming, and
interactive services. Many of these current and newly-developing services
require the transfer of large amounts of data that may not be technically
feasible with dial-up service. Therefore, broadband service may be increasingly
necessary to access the full range of services and opportunities that the
Internet can offer.
·
Broadband is always on. It does not block
phone lines and there is no need to reconnect to network after logging off.
·
Less delay in transmission of content when
using broadband.
Infrared
Infrared is a energy
radiation with a frequency below our eyes sensitivity, so we cannot see it. Even
that we cannot "see" sound frequencies, we know that it exist, we can
listen them.
Infra-Red is
interesting, because it is easily generated and doesn't suffer electromagnetic
interference, so it is nicely used to communication and control, but it is not
perfect, some other light emissions could contains infrared as well, and that
can interfere in this communication. The sun is an example, since it emits a
wide spectrum or radiation.
 |
| Infrared keyboard |
The adventure of using lots of infra-red in TV/VCR
remote controls and other applications, brought infra-red diodes (emitter and
receivers) at very low cost at the market.
From now on you should think as infrared as just a "red" light.
This light can means something to the receiver, the
"on or off" radiation can transmit different meanings.
Lots of things can generate infrared, anything that
radiate heat do it, including out body, lamps, stove, oven, friction your hands
together, even the hot water at the faucet.
To allow a good communication using infra-red, and
avoid those "fake" signals, it is imperative to use a "key"
that can tell the receiver what is the real data transmitted and what is
fake. As an analogy, looking eye naked to the night sky you can see
hundreds of stars, but you can spot easily a far away airplane just by its
flashing strobe light. That strobe light is the "key", the
"coding" element that alerts us.
Before the
end of our class, our classmates showed us how to use forum and chatting
corner. They had provide us a lot of info about MSN,SKYPE and Yahoo Messenger.
Thanks for their efforts!!! I had learnt a lot…..XD
 |
| MSN Messenger |
Here's a
video regarding the usage of infrared telescope to uncover
hidden cosmic creatures, including the coolest stars, dark asteroids and the
most luminous galaxies!!!
