Communications device, a system and method using inductive communication
First Claim
1. A communications device for wireless communication with another device, the communications device comprising first and second induction coils for providing an inductive coupling to the other device by generating first and second magnetic fields in response to first and second electrical signals, the first and second induction coils defining respective first and second longitudinal axes, the first and second induction coils being located in the communications device so that their respective longitudinal axes are non-co-parallel, and the first and second electrical signals are adapted to be time varying electrical signals V1(t), V2(t), each comprising a carrier signal V1c(t), V2c(t), respectively, and a modulating signal, where V2c(t)=K·
- V1c(t+Δ
t0), V being a voltage or current, K a constant, t being time, and Δ
t0 a constant.
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Accused Products
Abstract
The invention relates to the transmission of a signal from a communications device to another device (e.g. a hearing aid) by inductive communication and particularly to a scheme for improving the signal quality at the location of the other device. The object of the present invention is to provide an alternative scheme for improving the quality of inductive communication between two (e.g. portable) devices. The basic idea is to arrange at least two induction coils at an angle to each other in a transmitting device and to apply electrical signals comprising carrier signals comprising a carrier frequency fc to the at least two induction coils, the carrier signals of the two electrical signals being phase shifted relative to each other. An advantage thereof is that a reduced drop out is achieved. The invention may e.g. be used for portable communications devices requiring communication with another device over a relatively short distance, e.g. a body-worn audio selection device communicating with a head-worn audio listening device, e.g. a head set or a hearing aid.
28 Citations
26 Claims
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1. A communications device for wireless communication with another device, the communications device comprising first and second induction coils for providing an inductive coupling to the other device by generating first and second magnetic fields in response to first and second electrical signals, the first and second induction coils defining respective first and second longitudinal axes, the first and second induction coils being located in the communications device so that their respective longitudinal axes are non-co-parallel, and the first and second electrical signals are adapted to be time varying electrical signals V1(t), V2(t), each comprising a carrier signal V1c(t), V2c(t), respectively, and a modulating signal, where V2c(t)=K·
- V1c(t+Δ
t0), V being a voltage or current, K a constant, t being time, and Δ
t0 a constant. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 19, 20, 21)
- V1c(t+Δ
-
17. A communications device for wireless communication with another device, the communications device comprising first and second induction coils for providing an inductive coupling to the other device by generating first and second magnetic fields in response to first and second electrical signals, the first and second induction coils being located in the communications device and the first and second electrical signals adapted in such a way that a resulting rotating magnetic field is provided by the coils.
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18. A communications device for wireless communication with another device, the communications device comprising first and second induction coils for providing an inductive coupling to the other device by generating first and second magnetic fields in response to first and second electrical signals each comprising a common carrier signal comprising a carrier frequency fc, the first and second induction coils being located in the communications device and the first and second electrical signals adapted so that the magnetic field vector of the resulting magnetic field rotates in space with a rotation frequency equal to the carrier frequency fc.
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22. A method of inductive transmission from a communications device to another device comprising
Providing a communications device with first and second induction coils; -
Providing the other device with at least one induction coil; Applying first and second electrical signals to the first and second induction coils, respectively; Providing that each of the first and second electrical signals comprise a carrier signal comprising a carrier frequency fc, whereby first and second magnetic fields are generated by the first and second induction coils; Providing that the first and second induction coils of the communications device and the at least one induction coil of the other device are spatially oriented and located relative to each other to provide an inductive coupling between them when said first and second electrical signals are applied; and Providing that the first and second electrical signals are adapted so that the magnetic field vector of the resulting magnetic field rotates in space. - View Dependent Claims (23, 24, 25, 26)
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Specification