Saturday, February 12, 2011

CrazyEngineers Forum - Computer Science & IT Engineering

CrazyEngineers Forum - Computer Science & IT Engineering

Need a help for mpeg video coding procedure

Posted: 11 Feb 2011 09:46 AM PST

Hi!:)
i need to state the complete MPEG video coding procedure;).so please help me 2 state how the MPEG video coding procedure works! :)
thanx!

Bluetooth Architecture: Concept Explained

Posted: 11 Feb 2011 08:59 AM PST

I am trying to share some of my knowledge about the Bluetooth Architecture.

Here it goes:

Let us begin with a brief overview of what it contains and what it is intended to do.
The basic unit of a bluetooth system is a 'piconet', which consists of a master node and up to seven active slave nodes within a distance of 10 meters.
Multiple piconets can exist in the same (large) room and can be connected via a bridge node.

An interconnected collection of piconets is called a scatternet.



In addition to the seven active slave nodes in a piconet, there can be up to 255 parked nodes in the net. These are devices that the master has switched to a low-power state to reduce the drain on their batteries. In parked state, a device cannot do anything except respond to an activation or beacon signal from the master. There are also two intermediate power states, hold and sniff, but these will not concern us here.


The reason for the master/slave design is that the designers intended to facilitate the implementation of complete Bluetooth chips for under $5. The consequence of this decision is that the slaves are fairly dumb, basically just doing whatever the master tells them to do.

At its heart, a piconet is a centralized TDM system, with the master controlling the clock and determining which device gets to communicate in which time slot. All communication is between the master and a slave; direct slave-slave communication is not possible.

Explaining Concept: Invention of Bluetooth- The Story of the Birth

Posted: 11 Feb 2011 08:39 AM PST

In 1994, the L.M. Ericsson Company became interested in connecting the mobile phones to other devices without cables. Together with four other companies namely, IBM, Intel, Nokia and Toshiba, it formed a SIG (Special Interest Group i.e. consortium) to develop a wireless standard for interconnecting computing and communication devices and accessories using short-range, low-power, inexpensive wireless radios.

The project was named 'Bluetooth' after Harald Blaatand, a Viking King who unified Denmark and Norway 'without cables' :)

Although the original idea was to just get rid of the cables between devices, it soon began to expand in scope and encroach on the area of wireless LANs.
In July 1999, the Bluetooth SIG issued a 1500-page specification of V1.0
Shortly thereafter, the IEEE standards group looking at wireless personal area networks, 802.15 adopted the bluetooth document as a basis and began hacking on it. While it might seem strange to standardize something that already had a very detailed specification and no incompatible implementations that needed to be harmonized, history shows that having an open standard managed by a neutral body such as IEEE often promotes the use of the technology.

To be a bit more precise, it should be noted that Bluetooth specification is for the complete system, from the physical layer to the application layer of the OSI Model.
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