Empfänger und Verfahren zum Abrufen eines Informationssignals aus einem magnetischen Induktionssignal

Details

Veröffentlichungs-Nr.

EP2521221

Aktenzeichen

EP11165050

Anmeldetag

6. Mai 2011

Veröffentlichung

10. Juli 2024

Erteilung

10. Juli 2024

Rechtsraum

EP

IPC

H01Q9/00H04R25/00H04B1/00H04B5/00H01Q1/27H01Q7/00

Abstract

In wireless communication by means of modulated radio frequency signals, direct sampling of the RF signal is desired to allow more stable processing of the RF signal and to allow changing the characteristics of the wireless connection by reprogramming. However, the sampling rate in the analog-to-digital conversion must normally be at least twice the RF signal frequency in order to avoid frequency aliasing, and the digitiser (4) needs a high resolution in order to allow retrieval of weak signals in the presence of strong unwanted signals. These two requirements typically combine to cause unacceptably large power consumption. The present invention provides a receiver (1) and a method capable of direct sampling of modulated magnetic induction signals without the above mentioned disadvantages. This is achieved in that the receiving antenna circuit (2) is arranged in the reactive near-field of the modulated magnetic induction signal and forms a narrow band-pass filter. The output of the antenna circuit (2) 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 surprisingly of several orders of magnitude, which allows implementation of such receiving circuits in battery-driven devices such as hearing devices (15) without substantially affecting the battery life.

Anmelder

Firma

Oticon A/S

Land

🇩🇰 Dänemark

Fachgebiete