The present invention provides wireless charging techniques and devices for charging electronic device(s) within a closed space defined by a substantially hollow housing containing an antenna arrangement and configured to define an inner cavity for propagation of electromagnetic radiation from the antenna arrangement. The housing has an inner surface, encompassing the inner cavity, which geometry and material composition selected to define a general propagation path for the predetermined electromagnetic radiation from the antenna arrangement towards a charging zone. The inner cavity of the housing operates as a waveguide for directionally guiding the electromagnetic radiation to the charging zone and providing substantially maximal intensity of the electromagnetic radiation within the charging zone.

Disclosed in some examples are systems, methods, and machine readable media which allows for hearing instruments to be in a piconet with each other while being connectable as a slave to another device such as a smart phone when it comes within range. In some examples to accomplish this, one or both of the connected hearing aids may send connectable advertisements while connected with each other in the piconet by time multiplexing the advertisements between connection events.

Dispositif de téléphonie ou de multimédia portatif, comprenant un ou plusieurs éléments consommateur en électricité et un agencement permettant/adapté pour générer de l'électricité avec au moins un élément mobile en rotation, ledit est solidarisé en mouvement au dispositif ou fait partie intégrante du dispositif, caractérisé en ce que le dit au moins un élément mobile comprend un élément émetteur de champ électromagnétique.

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.

A magnetic induction system is disclosed, which has antenna diversity at the transmitter side, but which does not require a bidirectional link to pass information regarding received signal quality back to the transmitter. The system uses a time division multiplexing access (TDMA) arrangement, to transmit the same, or correlated, information with a level of redundancy, from two, or more, antenna to at least a receiver. The or each receiver is configured to determine a received signal quality from the channel received from one antenna, and, in response to inadequate signal quality, to switch to another antenna.

A receiver, and a transmitter for such a magnetic induction system are also disclosed, as is an associated method.

A non-limiting application of such a system is in binaural hearing aids, in which antenna diversity is preferred at the transmitter because of space limitations.