Abstract: A method for in-ear detection, the method may include transmitting test signals, by a speaker of an earbud, during a test period, and while the earbud is operating at a first operational mode, wherein the test signals comprise at least one first test signal within a first frequency range, at least one second test signal within a second frequency range, and at one third test signal within a third frequency range; wherein the first frequency range, the second frequency range and the third frequency range differ from each other and are within a human auditory range; generating, by a feedback microphone of the earbud, sensed information that is indicative of audio signals sensed by the feedback microphone as a result of the transmitting of the test signals; and determining whether the earbud is located within an ear of a person, wherein the determining is based on the sensed information and a reference out of ear spectrum.

Abstract: A method for in-ear detection, the method may include transmitting test signals, by a speaker of an earbud, during a test period, and while the earbud is operating at a first operational mode, wherein the test signals comprise at least one first test signal within a first frequency range, at least one second test signal within a second frequency range, and at one third test signal within a third frequency range; wherein the first frequency range, the second frequency range and the third frequency range differ from each other and are within a human auditory range; generating, by a feedback microphone of the earbud, sensed information that is indicative of audio signals sensed by the feedback microphone as a result of the transmitting of the test signals; and determining whether the earbud is located within an ear of a person, wherein the determining is based on the sensed information and a reference out of ear spectrum.

Abstract: A device for harvesting motion energy, the device having an outer structure, multiple piezoelectric units having a permanent source of electromagnetic field (magnet or electret) attached to a piezoelectric material, where each of the piezoelectric units is fixed, at least in part, to the outer structure, where the inner structure is configured to be free to move within the outer structure, and an electric circuit configured to store or provide electric energy supplied by the piezoelectric units due to strain caused by relative motion between the outer structure and the inner structure.

Abstract: A device for harvesting motion energy, the device including an outer structure, a plurality of piezoelectric units including a permanent source of electromagnetic field (magnet or electret) attached to a piezoelectric material, where each of the piezoelectric units is fixed, at least in part, to the outer structure, an inner structure located inside the outer structure, the inner structure including a plurality of permanent sources of electromagnetic field (magnets or electrets) fixed to a rigid frame, the inner structure is configured to be suspended within the outer structure due to mutual electromagnetic forces acting between permanent sources of electromagnetic field pertaining to the piezoelectric units and permanent sources of electromagnetic field pertaining to the inner structure, and an electric circuit configured to store or provide electric energy supplied by the piezoelectric units due to strain caused by relative motion between the outer structure and the inner structure.

Abstract: A method for in-ear detection, the method may include transmitting test signals, by a speaker of an earbud, during a test period, and while the earbud is operating at a first operational mode, wherein the test signals comprise at least one first test signal within a first frequency range, at least one second test signal within a second frequency range, and at one third test signal within a third frequency range; wherein the first frequency range, the second frequency range and the third frequency range differ from each other and are within a human auditory range; generating, by a feedback microphone of the earbud, sensed information that is indicative of audio signals sensed by the feedback microphone as a result of the transmitting of the test signals; and determining whether the earbud is located within an ear of a person, wherein the determining is based on the sensed information and a reference out of ear spectrum.

Abstract: A micro-electro-mechanical system (MEMS) electrostatic speaker that comprises an array of cells, wherein each cell comprises an upper stator, a membrane, a lower stator and supporting elements configured to support the upper stator, the membrane and the lower stator; wherein a distance between the upper stator and the lower stator of each cell is of microscopic scale.

Abstract: A method for in-ear detection, the method may include transmitting test signals, by a speaker of an earbud, during a test period, and while the earbud is operating at a first operational mode, wherein the test signals comprise at least one first test signal within a first frequency range, at least one second test signal within a second frequency range, and at one third test signal within a third frequency range; wherein the first frequency range, the second frequency range and the third frequency range differ from each other and are within a human auditory range; generating, by a feedback microphone of the earbud, sensed information that is indicative of audio signals sensed by the feedback microphone as a result of the transmitting of the test signals; and determining whether the earbud is located within an ear of a person, wherein the determining is based on the sensed information and a reference out of ear spectrum.

Abstract: A micro-electro-mechanical system (MEMS) electrostatic speaker that comprises an array of cells, wherein each cell comprises an upper stator, a membrane, a lower stator and supporting elements configured to support the upper stator, the membrane and the lower stator; wherein a distance between the upper stator and the lower stator of each cell is of microscopic scale.

Abstract: A reactor is provided which comprises: a plurality of reaction units located within a reaction zone, each of the reaction units being adapted to enable carrying out a chemical reaction of one or more raw gases (e.g. at least one of CO2 and H20); ingress means to allow introduction of the one or more raw gases into the reaction zone and to allow distributing the incoming gas to the plurality of reaction units; egress means to allow exit of reaction products from the reaction zone; and a heating system. The reaction units extend essentially along a longitudinal axis of the reaction zone and are arranged in a spaced-apart relationship along a lateral axis of the reaction zone. The heating system comprises a plurality of heating sources extending along the reaction zone, thereby providing at least a part of the energy to carry out the reaction process within the reaction units.

Abstract: A reactor is provided which comprises: a plurality of reaction units located within a reaction zone, each of the reaction units being adapted to enable carrying out a chemical reaction of one or more raw gases (e.g. at least one of CO2 and H20); ingress means to allow introduction of the one or more raw gases into the reaction zone and to allow distributing the incoming gas to the plurality of reaction units; egress means to allow exit of reaction products from the reaction zone; and a heating system. The reaction units extend essentially along a longitudinal axis of the reaction zone and are arranged in a spaced-apart relationship along a lateral axis of the reaction zone. The heating system comprises a plurality of heating sources extending along the reaction zone, thereby providing at least a part of the energy to carry out the reaction process within the reaction units.