Negative Gravity
Yesterday I was trying to send some videos with 200 MB data to another mobile. Though it happened smoothly, one question came to my mind. I have used this technology every day, but did not try to understand about it yet.
It made me very happy too since I got my topic!!
Infrared, Bluetooth and now NFC – all these technologies had done its part in different period. I used to remember keeping 2 Nokia phones in the straight line to transfer an image. Now it’s just a tap away. Here are some details about each technology – one is outdated, one is widely used and we yet to know the potential of last one.
As the name indicates, the communication is established via infrared signals. This technology is used by most of the remote controls. This technology is device specific and there should be direct line of sight between (max 3 feet) transmitter and receiver. This communication is more secure since it can be intercepted by a device and it’s one-to-one.
Compared to infrared, Bluetooth devices can work together, its omni-directional. Current devices can transfer in the range of 30 feet. Bluetooth uses radio frequency and hence transmission is possible through walls or other objects and hence it is widely used in computers, PDA, headsets, mobile handsets etc. These devices can communicate with each other irrespective of the manufacturer since it is using standard 2.4 GHz frequency (ISM – Industrial Scientific and Medical devices — band).
History – it is named to honor Denmark ’s king Harald Bluetooth who ruled in 900s. The name was given to indicate the importance of Nordic region companies for the telecommunication industry. BT was created by Ericson in 1994, as an alternative to RS-232 data cables
Bluetooth communication does not need user intervention and uses very little power: — we connect devices such as phone, car GPS, mobile, PC and control them smartly (it automatically switches to the appropriate devices – handsfree is an example, if you setup devices in car audio and home land phone, the call switched automatically to these devices …pretty cool rite?). Current devices can transfer data up to 3Mbps (2.0 devices).
As I said earlier, it works in RF and lot of other devices such as cordless phones, baby-monitors, garbage door openers too are using same ISM band. Bluetooth uses very weak signal of 1 milli-watt to avoid interference and hence limits the range to 30 feet. Also it can connect 8 devices simultaneously and uses spread-spectrum frequency hopping method to avoid interference with each other (too technical, so no details).
Like other wireless network, Bluetooth also faces security issues since hackers can try to grab your data or interfere with signals with same frequency. Bluetooth offers several security options to avoid this – allowing only trusted devices, making the devices non-discoverable, pairing etc. Similar to hacking there is bluejacking – sending a business card as text message, contact added in address book by mistake and the hacker gets the control of the address book and phone.
BT communication can be done with a computer and other devices using a USB-dongle (most laptops have added this in-built)
Near Field Communication a.k.a NFC is the current hot topic in the smartphone market and it takes communication to the next level. I don’t think it is a replacement for BT, but NFC is preferable in some places.
In simple words, BT is like a phone communication – sender and receiver should be available and NFC is like an e-mail – we can transfer some information to a device (called tags) and then this can be used in any other device
As the name (near field) indicates, maximum distance for communication is only 4 centimeters. NFC can interact with other device with a single wave and it’s faster compared to BT (needs only 1/10 seconds to establish).
It also reduces the security risk specified in case of BT and NFC needs minimal power compared to BT. The speed of NFC is only 424 kbit/s and it can be used in combination with BT to speed up the process.
NFC can make use of un-powered chip called as tag to communicate – that’s why I said, its like an e-mail. Many vendors are creating these tags and X-peria smart tags are one of the popular one. You can save your phone settings, or browser bookmarks to a tag and this can be restored in any other NFC powered devices. NFC is similar to RFID (radio frequency identification) technology.
Android uses NFC technology as Android-beam and this was launched in Android 4.0 ICS. They have customized the technology and made data transfer a dream – just swipe or touch the devices. It also supports technology called Wi-Fi Direct, previously known as Wi-Fi P2P. As the name shows, your mobile device can do peer-to-peer networking and transfer data. I think this is the coolest feature of NFC (torrent in smartphone?)
Samsung has again customized this and introduced S-beam, all-share to make payments or transfer images, videos etc and launched in Galaxy III.
NFC, Android beam, S-beam have so-many features and I have to include them in another article. We can expect more stuff in NFC since it’s in growing stage and Android 4.1 jelly bean is already started hitting the market. I pity I-phone users since they can’t try these stuffs in near future
I guess you got an overall idea about some of the most important communication/transfer technologies we have used so far. If you like it, post your comments and keep reading. Thanks
- Get link
- Other Apps
Comments
Phantom Communications is an outstanding company with a goal-driven culture,» said Albert Mita. «I am honored to serve as CEO with these employees who work hard every day.
Source : Albert Mita, Phantom communications
Phone : 7188325245
City/Town : Brooklyn
State/Province : New York
Country : United States
Industry : Wireless, Telecom Reply Delete
Fantastically written. I learned a whole lot, post even more inside the future.
Continue the great work.
these tubs new kids walkie talkie Talkie Radios are
designed to conserve more energy if this is the case the prior versions and so, have power preserving attributes for instance the car backlight turn-different and radio shutdown capabilities.
It could look a dual cradle for both 2 way radios, or a
single holder for while each that are used in the event generally the radios are apart.
Other major considerations in choosing the cheapest walkie
talkie radio for you and your family is your requirements and looking for options and accessories such as multiple
channels, hands free walkie talkie capabilities,
or portability such as having the ability to wear a
device on your personal clothes, because a watch, or perhaps even
compared to your own walkie talkie headset.
Normally I don’t learn article on blogs, however I would
like to say that this write-up very compelled me to try and do it!
Your writing taste has been surprised me. Thank you,
quite great article.
Post a Comment
Please add your valuable comments
Popular Posts
Android 5.0 Lollipop in Nexus 4 Hands on Review — Page 3
Continued from Page 2 11) Gallery I am disappointed to see that there is no gallery app and only Google photos app is available. It is difficult to view the folders since the way it is organized is not so user friendly. I was expecting a redesigned Gallery 12) Camera No improvements in camera even after upgrading. The same camera app used in 4.4 is available in 5.0 as well After few days, I discarded Google Photos and switched to CyanogenMod galley and then to QuickPic. The camera has issues in focusing images I was not able to get any good pictures even in daylight. I tried various alternate cameras and all of them were slow or showing spam messages. Finally downloaded Android 4.3 camera from XDA and it gave me back the nice old camera and gallery. Here is the APK file if you are also having issues with camera after update — https://www.dropbox.com/s/u0fav4br7tx9znf/Android4.3_Camera.apk?dl=0 13) Battery I did not find any major improvement in battery
What is Projection keyboard
A projection keyboard is a virtual keyboard that can be projected and touched on any surface. The keyboard watches finger movements and translates them into keystrokes in the device. Most systems can also function as a virtual mouse or even as a virtual piano.[1] A proposed system called the P-ISM will combine the technology with a smallvideo projector to create a portable computer the size of a fountain pen.[2]a How a projection keyboard generally works: 1. A laser or beamer projects visible virtual keyboard onto level surface 2. A sensor or camera in the projector picks up finger movements[3] 3. detected co-ordinates determine actions or characters to be generated Some devices use a second (invisible infrared) beam: 1. An invisible infrared beam is projected above the virtual keyboard 2. Finger makes keystroke on virtual keyboard. This breaks infrared beam and infrared light is reflected back to projector 3. Reflected infrared beam passes through infrared filter to camera 4.
Mobile communication and bluetooth
Learn Latest Tutorials
Preparation
Trending Technologies
B.Tech / MCA
Javatpoint Services
JavaTpoint offers too many high quality services. Mail us on h[email protected], to get more information about given services.
- Website Designing
- Website Development
- Java Development
- PHP Development
- WordPress
- Graphic Designing
- Logo
- Digital Marketing
- On Page and Off Page SEO
- PPC
- Content Development
- Corporate Training
- Classroom and Online Training
- Data Entry
Training For College Campus
JavaTpoint offers college campus training on Core Java, Advance Java, .Net, Android, Hadoop, PHP, Web Technology and Python. Please mail your requirement at [email protected].
Duration: 1 week to 2 week
Like/Subscribe us for latest updates or newsletter 
