infotoall: CONTROLLING THE MOUSE WITH YOUR EYE

infotoall: CONTROLLING THE MOUSE WITH YOUR EYE: Most of the user of the computer suffer pain in the wrist or in fingers due to over usage of pc or laptops by infront of them whole day b...

infotoall: MODEM

infotoall: MODEM: The main function of modem is to convert the digital to analog signal(modulation) and analog to digital signal (demodulation) for the c...

CONTROLLING THE MOUSE WITH YOUR EYE

Most of the user of the computer suffer pain in the wrist or in fingers due to over usage of pc or laptops by infront of them whole day by typing and moving the mouse. Due to this some of the user gets muscular pain etc. The research scholars of imperial college in London have found out a solution to this problem that is controlling the mouse with your eye.

                             A small device is used for this purpose which is called as GT3D device. This device consists of a pair of glasses (like the coolers) that user must wear when you need to move the mouse with eye. And also two fast control cameras are used to keep track of your eye. The camera constantly records the movement of the pupil and moves the cursor to the direction where it points to. This device is on the development stage so the scholars demonstrated the effective usage of the device by a pong game. They also demonstrated how the surfing in net could be done using this system. The previous version devices of GT3D has some disadvantage such as you need to look on an icon for a prolonged period of time inorder to open the application of the icon, due to this when you stare on the desktop screen for some time then this automatically opens. Inorder to avoid this problem  GT3D device is sensitive so that just a look at that opens the application and they have attached the 3d facility so that the camera could detect whether your are just looking simply on desktop screen  or the user  need to open the application. The cost of this GT3D device is much cheaper (40$) than the other system input that we use.

MODEM

The main function of modem is to convert the digital to analog signal(modulation) and analog to digital signal (demodulation) for the communication between the server that provides the internet and the computer which uses those data. Modem stands for modulation and demodulation.

TYPES OF MODEM :

External Modem: This is a modem separated from the system unit in the computer case. It is connected to the serial port of the computer by means of a cable. It is connected to the telephone  jack by another cable.

Internal Modem: An internal modem is a circuit board that can be added to the system.

Standard Modems: Most modems used today are  standard modems. These modems are usually operated by commands entered from a  keyboard. Users control the functions a modem through the keyboard. Modems may use different command languages to control their functions, but most modems (called "Hayes compatible") use a popular language developed by a company "Hayes Microcomputer Products, Inc." The command ATDSX4, for example, indicates that pay attention (AT), dial stored telephone number (DS), and then display the progress of the call (X4).

Intelligent Modems: Intelligent modems are also called advanced modems. These modems can accept new instructions and then respond to the commands while transmitting data and information. These can be done by microprocessor chips and internal read only memory (ROM) contained in the modem. Of course, these modems are more expensive.

Short-Haul Modems: Short- haul modems are devices that transmit signals through the cable . They are also are called modem eliminators, because they do not require an external power source. They are also called line drivers that can send data for a distance of more than one mile. This type of modem can be used within or across several buildings in a company or a university campus.

Wireless Modems: Wireless modems transmit the data signals through the air instead of by using a cable. They sometimes are called a radiofrequency modem. This type of modem is designed to work with wireless local area networks namely wifi.

Even in the cell phone that we use today has modem the modems are used for surfing in the internet etc.This modems also does the same work of modulation and demodulation but the circuit of this modem is much smaller than the normal modem