In this modern age, computers have verified the cause of their existence. They have virtually taken over in every field of today's fast life. Gone are the days when applications of computers were limited to official use only. Today computers have important place in every household purpose, and mainly internet has taken over whole world. There are various causes due to which computers have their own stand in our life. It provides a very good facility of fast processing, sound and picture. The virtual reality concept has provided very good features to the computer systems. The concept of virtual reality is introduced by the computer programmers to provide more attachments to the user.

There are several concepts of the virtual reality that are available such as digital smell, virtual theater, electronics hand gloves, multipoint surround sound system,3d goggles. The digital smell is basically a hardware software combination. The hardware part of digital smell will produce the smell, and the software part will evaluate the smell equation and generate specific signals for specific smell and finally that smell will be produced by the device. The hardware device is a device like speaker, this device is also connected to the computer system. For this device there is also a driver program which will evaluate the digital equation for generating specific gas. Until now, online communication involved only two of our senses-hearing and sight. New technology is being developed to appeal to our sense of smell. DigiScents, an interactive media company, is creating iSmell Digital Scent Technology, new software which will enable scents to be broadcast from the Web.

Coding of aromas would be downloaded to computer similar to graphics images as audible sounds. Ultimately users will be able to create and modify their own fragrances and post them on the internet. The "Savor the World" tagline illustrates the California-based company's aims to tap into the power of scent as a communication tool. "DigiScents combines the power of science with the fact that the sense of smell is as powerful and emotional trigger as any other sense," the Web site states. This new technology will make it possible to send and receive scented e-mails and to add scent elements to Web sites, to name just a few of its applications. In future these devices will play very well role in our life, such as in Theater, Televisions, internet etc. Drawback of the cyber world is that it lacks realism. It is about time to make use of "the nose" in digital world.

Evolution Of Digital Smell

How it was Invented?

As we know that many scientists have started for the virtual reality from the last 5 to 6 years. As a virtual reality they have got a full concept as virtual theater. These theaters consist of an electronic hand gloves, digital smell, multipoint surround sound system, movement controllable seats, 3d goggles. From this idea the multipoint surround sound system, 3d goggles, movement controllable seats were completed. Now for the user to fill more realistic effects of movies they were introducing the very new facility of digital smell in movies or in games. For example if we are watching a movie and we see burning of tier then we will fill that smell in theater or pc or television. The basic idea for this was given by the perfume making companies for the advertisements of their perfumes.

•  Founders

Founders Dexster Smith and Joel Lloyd Bellenson, experts in bioinformatics and genomics, started from the following idea: "If we can find the essence of a biological smell and build a profile, we can digitalize and broadcast it." They came up with the idea for the company while they were in South Beach. Using their scientific knowledge, they indexed and analyzed natural smells said to be common to South Beach such as flowers, salt water, and suntan lotion.

•  About Technology

Until now online communication involved only two of our senses, sense of hearing and sense of sight. Soon it will involve the third, the sense of smell. A new technology is being developed to appeal to our sense of smell. Bringing alive our experience, technology now targets on the sense of smell. Using Electronic-nose we can sense a smell and with a technology called Digital scent technology it is possible to sense, transmit and receive smell through internet, like smelling a perfume online before buying them, sent scented E-cards through scent enabled websites, and to experience the burning smell of rubber in your favorite TV games etc.

If this technology gains mass appeal no one can stop it from entering into virtual world. Just imagine you are able to smell things using a device connected to your computer. With Digital scent technology this can be made a reality. There is complete software and hardware solution for scenting digital media and user.

Physiological Aspects of Smell

Olfactory displays should rely on users distinguishing different smells not strength and duration of smells. Olfactory displays must take into account potential allergy and nausea reactions. Smell is generally appropriate for slow moving data.

Before we describe the possibilities of olfactory displays, we should take a glance at the physiological aspects of smell. How does the nose work and what is its function? Naturally we can breath, smell and additionally taste with our nose. First of all we are interested in the anatomy of the nose.

Odor consists of many different molecules, for e.g. the aroma of coffee is made up of 20 various molecules. Nonetheless our nose perceives only 15 odors which is enough to identify the smell as coffee.

At first the odor molecules reach the olfactory mucosa. The receptors for the molecules are placed at the olfactory hairs. When the molecules reach the receptors, an electric impulse is sent directly to the brain to the olfactory bulb. Then the information gets to the olfactory glomeruli, a part of the olfactory bulb. The glomeruli is able to associate the information to the intensity. The olfactory bulb consequently processes the odor and can send the impulse to the olfactory brain. We notice that we have a direct connection between our sense of smelling and our brain. Those scent impulses reach the area of our brain that handles emotions and memories. That explains the link between smelling and being reminded of something.

We percept smell very individually. Every human perceive a difference between a pleasant and unpleasant odor. Humans are not capable to distinguish odors in terms of intensity. Roughly we can only distinguish between three concentrations of some odor whereas we should actually be able to differentiate1000types of odors. Another problem for olfactory display is the fast acclimatization of humans to scents.