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Diversity circuit for magnetic communication system
| Details |
Inventors: Palermo, Vincent; Cobler, Patrick J.; Butler, Neal R.;
Assignee: Aura Communications, Inc. (Wilmington, MA)
Primary Examiner: Vo; Don N.
Assistant Examiner:
Attorney, Agent or Firm: Testa, Hurwitz & Thibeault, LLP
A magnetic communication system includes a transmitter have a single coil transducer, and a receiver having a three orthogonally oriented coil transducers. The signal processing circuitry in the receiver adjusts the phases of the signals received by the three transducers to produce signals which are in-phase. The signals are then summed to provide an output signal from the receiver. The processing circuitry adjusts the phases of the incoming signals either serially or in parallel. Transmissions from the receiver to the transmitter are also phase adjusted in accordance with the same adjustments used in reception. |
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DETAILED DESCRIPTION The deficiencies of prior art systems are overcome in great part by the present invention which, in one aspect, includes a short-range, wireless communication system including a miniaturized portable transceiver and a base unit transceiver.
The miniaturized portable transceiver sends and receives information through magnetic induction to the base unit, which may also be portable.
Similarly, the base unit sends and receives information through magnetic induction to the portable transceiver.
The information can be voice, data, music, or video.
Use of magnetic induction fields reduces the power requirements and thus allows a smaller size and greater convenience.
In another aspect of the present invention, the base unit or portable device may include multiple, orthogonally arranged transducers for generating multiple magnetic fields.
The multiple fields substantially eliminates mutual inductance nulls between the base unit and portable unit which result at certain positions in a generated field.
In another aspect of the present invention, the multiple transducers may be selectively operated based upon a strongest signal, in order to limit power consumption and improve signal reception.
The signals from the transducers are electronically scanned.
The signals are then phase adjusted and combined to achieve a maximum signal level.
In another aspect of the invention, the same phase information is used for a transmitted signal.
This allows the other device to use a single transducer while maintaining a high signal to noise ratio.
In another aspect of the present invention, the magnitude of the incoming signals is used for selective transmission on one or more of the transmission transducers.
The amplitude of the signal from each of the transducers is determined.
This amplitude information is used for selecting one or more drivers for the transmission transducers corresponding to the greatest amplitude.
In another aspect of the present invention, a headset contains the miniaturized transceiver which communicates with the base unit through magnetic induction fields
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Ring Tones 
