RECEIVER AND METHOD FOR RETRIEVING AN INFORMATION SIGNAL FROM A MAGNETIC INDUCTION SIGNAL
First Claim
1. A receiver for retrieving an information signal from a magnetic induction signal comprising a carrier signal modulated in dependence on the information signal, the receiver having a signal path comprising:
- an antenna circuit adapted to receive the magnetic induction signal and to provide a corresponding electric antenna signal;
an amplifier adapted to amplify the electric antenna signal;
a digitiser adapted to digitise the amplified signal; and
a digital demodulator adapted to retrieve the information signal by demodulating the digitised signal,characterised in that the antenna circuit forms a narrow band-pass filter and that the receiver is adapted to retrieve the information signal without any frequency translation in the signal path between the antenna circuit and the digitiser.
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Accused Products
Abstract
A receiving antenna circuit is arranged in a reactive near-field of a modulated magnetic induction signal and forms a narrow band-pass filter. The output of the antenna circuit is not subjected to any frequency translation prior to digitising, and the signal may nevertheless be digitised with low resolution, which radically reduces the power consumption of the receiving circuits. The reduction in power consumption is of several orders of magnitude, which allows implementation of such receiving circuits in battery-driven devices such as hearing devices without substantially affecting the battery life.
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Citations
15 Claims
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1. A receiver for retrieving an information signal from a magnetic induction signal comprising a carrier signal modulated in dependence on the information signal, the receiver having a signal path comprising:
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an antenna circuit adapted to receive the magnetic induction signal and to provide a corresponding electric antenna signal; an amplifier adapted to amplify the electric antenna signal; a digitiser adapted to digitise the amplified signal; and a digital demodulator adapted to retrieve the information signal by demodulating the digitised signal, characterised in that the antenna circuit forms a narrow band-pass filter and that the receiver is adapted to retrieve the information signal without any frequency translation in the signal path between the antenna circuit and the digitiser. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for retrieving an information signal from a magnetic induction signal comprising a carrier signal modulated in dependence on the information signal, the method comprising:
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receiving the magnetic induction signal in an antenna circuit arranged in the reactive near-field of the magnetic induction signal and providing a corresponding electric antenna signal; amplifying the electric antenna signal; digitising the amplified signal; and retrieving the information signal by digital demodulation of the digitised signal, characterised in that the antenna circuit functions as a narrow band-pass filter and that the electric antenna signal is not subjected to any frequency translation prior to digitising.
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Specification