Bluetooth headset
Bluetooth is a rapidly evolving wireless communications standard for small devices having link and application layer definitions for communications protocols, bandwidths and so on. Bluetooth technology is essentially a short-range wireless data communication technique using low-directivity radio waves, which enables an ad-hoc wireless connection between wireless communication devices within a region with a radius of about 10 m. The Bluetooth modules have been widely applied to communication terminals, computer peripherals, and household appliances, etc. A representative example of the Bluetooth module is a wireless headset or an earphone. The Bluetooth headset allows a user to hear a voice signal of a called party in the same way as a headphone, and at the same time allows the user to transmit voice signal to the called party in the same way as a microphone. Bluetooth enabled devices use the 2.4 to 2.4835 GHz band in most nations, a loosely regulated band of the frequency spectrum allowing high bandwidth, short range communications using 625 microsecond time division packets. A bluetooth headset includes a battery, a microphone, a speaker and an inner transceiver. A bluetooth headset also requires a second, external transceiver, which has its own battery. This external transceiver, commonly known as a "dongle," replaces the wire which would otherwise connect the headset with an external device, (e.g., with a cellular phone). The dongle receives headset signals from the wireless headset, typically in the form of RF signals, transforms the headset signals into a format used by the external device and transmits the transformed headset signals to the external device.
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