What is the Bluetooth® transmitter?
In the middle of 900 years, the Danish King Harald Bluetooth United Denmark and part of Norway into one kingdom. At the end of the 20th century, Swedish engineers in Ericsson Transmission developed, wireless technology that can unify different electronic devices regardless of their type, manufacturer or operating system. Using low -energy radio waves, the Bluetooth® transmitter can transfer signals from the computer to the stereo system, from the mobile phone to the printer or from the apple to the PC.
The remote controls use infrared signals to send remote control information to a device such as a TV or DVD player. However, for the remote control to work, it must be directed directly on the TV. With Bluetooth® wireless transmitters, devices up to 30 feet (10 m) can communicate apart, despite the walls and around the corners. This is because Bluetooth® transmitter uses 2.45 GHz radio waves to transmit signals.
When one Bluetooth® transmitter captures another, it automatically creates a small wireless network called Piconet, which works until the transmitter and receiver are within 30 feet (10 m) apart. For example, the user can enter his house and his mobile phones could automatically be handed over to his wireless mainland. When he passes his computer, his e -mail can be downloaded to his mobile phone or PDA, then he can send the downloaded music to his stereo and photo from the digital camera to his daughter's phone. Bluetooth® wireless technology eliminates the need for another cord to allow the network between different devices.
Since the frequency of 2.45 GHz is also used for other household devices, engineers had to develop a way to prevent interference. They needed to prevent things like a mobile phone, which accidentally causes garage door. To achieve this goal, the Bluetooth® transmitter uses a very weak signal, only about one million.
In addition one transmitterBluetooth® can communicate with up to eight other devices simultaneously, without interference. This is done with what is called "SERED Spectrum frequency jumping". Because the 2.45 GHz frequency actually includes a range between 2.402 GHz and 2.480 GHz, Bluetooth® can jump between 79 different randomly selected frequencies at 1,600 changes per second. As a result, it is unlikely that some two devices would use the same frequency simultaneously, and if so, interference will not take more than a few milliseconds.