A transmitter typically converts electrical energy into a signal, which is then broadcast via carrier wave through an antenna to a receiver's antenna. Repeaters, middle stations, etc. may be used as intermediates in the transmission to sustain the integrity of the transmitted wave. Transmitters, receivers, and transceiver for modulating waves have been implemented in a number of ways. Bluetooth is an industry specification that specifies a wireless transceiver microchip that allows devices in a room or home to discover one another and communicate over a wireless link. The microchip can be integrated into phones, computers, or similar devices. A Bluetooth transmitter is a radio communication device which uses at least one radio communication link for one-channel signal transmission. Bluetooth transmitters interconnect devices placed quite close to each other, for example, a portable telephone and a notebook type personal computer, a stereo system and a headphone, and the like through a radio communication link using very weak radiowaves in a 2.4 GHz band, which does not require a license, to transmit data and audio. The electrical energy input into a transmitter usually results from some intelligence being generated by a sender, such as voice, data, etc. This intelligence is modulated onto a carrier wave by the transmitter. The now modulated carrier wave is the transmitted electromagnetic signal. A receiver may then demodulate the signal, by deconstructing the modulated carrier wave into a copy of the initial intelligence sent by the transmitter. For transmitting an audio signal in Bluetooth, the audio signal is converted to a digital signal by an audio codec (coder/decoder), generally employed in PCM communications for transmission.
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