Multimedia
Listening to your music and the radio throughout your house is now, finally, possible. No need to copy or burn your mp3’s to be able to listen to them in your lounge room or bedroom. This is the idea behind Gigabytes Air Cruiser (GN-BT06T) and the Philips WiFi SLA5520 network player.
Widely used, most notably in the field of mobile telephones, Bluetooth is a short distance wireless communication protocol. With low energy consummation, the Bluetooth technology allows you to link together different devices (printers, Livebox, laptops, PDA’s, mice, headphone kits, speakers etc). Like with the WiFi technology, Bluetooth (802.15) uses the transmission of radio waves across a range of frequencies located between 2.4 GHz and 2.4835 GHz.
To prevent distortion, Bluetooth uses Adaptive Frequency Hopping (AFH). This technology allows you to use 79 channels, separated from each other by 1 MHz, so as to be able to modulate and prevent any broadcast problems.
To prevent distortion, Bluetooth uses Adaptive Frequency Hopping (AFH). This technology allows you to use 79 channels, separated from each other by 1 MHz, so as to be able to modulate and prevent any broadcast problems.
The characteristics of Bluetooth are also enough to transmit audio with Bluetooth 1.2 offering a theoretic speed of 1 Mbps. This corresponds to 1600 exchanges per second in both directions (simultaneous sending/receiving).
In version 2.0 + EDR, the speed reached is 3 Mbps. To complicate things a little more for the user, the transmissions ranges are divided into 3 common ranges. Class 3 offers a range of 10 meters and uses about 1 mW, while class 2 uses 2.5 mW for a range of 15-20 meters. Class 1 has a maximum range of 100 meters with the use of energy still being very low at only 100 mW.
Bluetooth uses numerous profiles, but the goal is to assure interoperability between the Bluetooth devices. Each profile doesn’t operate with all peripherals. If you want, for example, to broadcast audio, you should verify that your Bluetooth devices use the A2DP profile (Advanced Audio Distribution Profile). This will allow you to transmit a high quality audio stream by using the Low Subband Complexity codec, MP3 or Ogg, depending on the device.
You should therefore not overlook this profile, as it is necessary depending on the use of your Bluetooth devices.
In version 2.0 + EDR, the speed reached is 3 Mbps. To complicate things a little more for the user, the transmissions ranges are divided into 3 common ranges. Class 3 offers a range of 10 meters and uses about 1 mW, while class 2 uses 2.5 mW for a range of 15-20 meters. Class 1 has a maximum range of 100 meters with the use of energy still being very low at only 100 mW.
Bluetooth uses numerous profiles, but the goal is to assure interoperability between the Bluetooth devices. Each profile doesn’t operate with all peripherals. If you want, for example, to broadcast audio, you should verify that your Bluetooth devices use the A2DP profile (Advanced Audio Distribution Profile). This will allow you to transmit a high quality audio stream by using the Low Subband Complexity codec, MP3 or Ogg, depending on the device.
You should therefore not overlook this profile, as it is necessary depending on the use of your Bluetooth devices.
The different profiles are:
- GAP: Generic Access Profile (basic detection of Bluetooth devices)
- SDAP: Service Discovery Application Profile (detection of available profiles)
- SPP: Serial port Profile (serial connection between two devices)
- HS Profile: Headset profile (wireless headphones)
- DUN Profile: Dial up networking profile (private network and Internet connection)
- LAN Access profile (local area network)
- Fax Profile (sending faxes)
- GOEP: Generic Object Exchange Profile (data exchange)
- SP: Synchronisation profile (manual or automatic data synchronisation between two devices)
- OPP: Object Push Profile (a layer on GOEP which allows you to send data without passing via the network)
- FTP: File Transfer Protocol (transfer of files remotely)
- CTP: Cordless Telephony Profile (wireless audio communication)
- IP: Intercom Profile (direct audio communication between two devices)
- A2DP: Advanced audio distribution profile
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| RAID 0 / 1 / 0+1 / 5 / JBOD: Descriptions and explanations | Wireless Laser 8000 - Wireless Notebook Laser 6000 mice test |
May 23rd, 2013 - 6:45 AM ET
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