Bluetooth Working
Bluetooth devices will normally operate at 2.4 GHZ in the license free, globally available ISM radio band. The advantage to this band includes worldwide availability and compatibility. A disadvantage to this however, is that the devices must share this
band with other RF emitters. This includes automobile security systems, other wireless devices, and other noise sources, such as microwaves.
To overcome this challenge, Bluetooth employs a fast frequency hopping scheme and therefore uses shorter packets than other standards within the ISM band. This scheme helps to make Bluetooth communication more robust and more secure.
Frequency hopping
Frequency hopping is basically jumping from frequency to frequency within the ISM radio band. After a bluetooth device sends or receives a packet, it and the device (or devices) it’s communicating with hop to another frequency before the next packet is sent. This scheme offers three advantages:
1. Allows Bluetooth devices to use the entirety of the available ISM band, while never
transmitting from a fixed frequency for more than a short period of time. This helps insure that Bluetooth conforms to the ISM restrictions on the transmission quantity per frequency.
2. Ensures that any interference won’t last long. Any packet that doesn’t arrive safely
to its destination can be resent to the next frequency.
3. Provides a base level of security as it’s very hard for an eavesdropping device to predict which frequency the Bluetooth devices will use next.
The connected devices however, must agree upon the frequency they will use next. The specification in Bluetooth ensures this in two ways. First, it defines a master and slave type relationship between bluetooth devices. Next, it specifies an algorithm that uses device specific information when calculating the frequency hop sequences.
A Bluetooth device that operates in master mode can communicate with up to seven devices that are set in slave mode. To each of the slaves, the master Bluetooth device will send its own unique address and the value of its own internal clock. The information sent is then used to calculate the frequency hop sequences.
Because the master device and each of the slave devices use the same algorithm with the same initial input, the connected devices will always arrive together at the next frequency that they have agreed upon.
As a replacement for cable technology, it’s no onder that Bluetooth devices are usually battery owered, such as wireless mice and battery powered cell phones. To conserve the power, most devices perate in low power. This helps to give Bluetooth devices a range of around 5 - 10 meters.
This range is far enough for wireless communication put close enough to avoid drawing too much power from the power source of the device.
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Bluetooth connecting people
Constantly evolving, the technology of Bluetooth started off as a basic wireless connection standard but has since then been adapted and proven with many different uses and functions.
A good example is Bluetooth for cell phones. It enables mobile users to connect to their hands free headset without using wires. Bluetooth technology will also allow mobile phone users to connect with their hands free kit as well.
Another handy use of Bluetooth is file sharing. It allows the sharing of files between two cell phones, between a cell phone and computer, which makes the sharing of files a snap. If you have a cell phone and computer, you can easily transfer data between the two.
Say for example you wanted to put an MP3 on your phone from your computer you could do it easily with Bluetooth. All you would need is a Bluetooth adapter for your computer. It doesn’t stop with the swapping of files either,as you can use your computer and phone to synchronise phone books, send SMS messages, and much more.
Although Bluetooth may be dandy for cell phones, it also comes in handy for the home office as well. Utilizing Bluetooth is a great way to set up a home office - two computers, a printer, and even a scanner. They all can be connected using Bluetooth technology with effective ranges of up to 10 meters.
The technology and devices of Bluetooth will be around for years and years to come. As years go by, Bluetooth will provide even better wireless solutions for different applications. Even though Bluetooth has a short range, it has that short range for a reason. Bluetooth is easily the best in wireless technology - which it continues to
prove time and time again.
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Bluetooth Headset
Creating a good wireless headset for Bluetooth is actually difficult to do. The regular wired headsets are easy to design - with ranging styles.
Bluetooth headsets can never be as small or as light as wired headsets, simply because it needs to include the battery and extra functions. This extra size will impact how the headset mounts on or around your ears.
Comfort
There seems to be two main styles of headsets for Bluetooth. Some are held into place with a loop around the ear. These styles are normally more comfortable, although they may be less secure. The others are held in place by being jammed into your ear - and usually prove to be less comfortable.
Factors to consider
Cost
The cost is an obvious issue, something that you really need to think about.
Ergonomics
1. Check to see if the device is easy to quickly and conveniently put on your ear then take it off again.
2. Are the control buttons on the headset easy to use?
3. The headset should be comfortable to wear for long phone calls.
4. Can you use it with a pair of glasses?
5. Check to see if you can wear it with either ear.
6. When you aren’t wearing it, you’ll need to se how you would carry it with you.
7. The weight is important as well, as you don’t want something that has the risk of falling off.
Ease of use.
1. The commands and controls should be easy to remember.
2. The volume level should be easy to adjust.
3. The unit should turn on quickly.
4. The manual should be very well written and easy for you to understand.
5. There should be a support number for you to call if you should experience any types of problems.
Features
1. You’ll need to know about the battery, the talk time, type, and how to tell when it is
going dead or fully charged.
2. How many devices can the unit be paired with?
3. Compatability is also important, as well as the warranty period.
4. Check the sound quality for both sending and receiving audio.
5. What type of range does the headset offer you?
Other important capabilities include voice tags, last number redial, tranfer calls, 3 way calling, link to other phones, call reject, and mute. You’ll also want to note if it looks attractive, and if it’s too big or too small.
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