The present disclosure relates generally to occupancy detection, and more particularly to detecting a change in the occupancy of a predetermined area using a passive antenna array. In certain embodiments, baseline signals may be received by an antenna array associated with a display device. The baseline signals may analyzed to detect a baseline of radio frequency signals present in a predetermined area. New radio frequency signals may be received at a later time. The new signals may be analyzed to reveal characteristics of the new signals. Characteristics of the new signals may be compare to characteristics of the baseline signals to determine if the new signals differ from the baselines signals by more than a threshold amount. One or more actions may be executed in response to determining that the new signals differ from the baseline signals by more than the threshold amount.

The present disclosure relates generally to occupancy detection, and more particularly to detecting a change in the occupancy of a predetermined area using a passive antenna array. In certain embodiments, baseline signals may be received by an antenna array associated with a display device. The baseline signals may analyzed to detect a baseline of radio frequency signals present in a predetermined area. New radio frequency signals may be received at a later time. The new signals may be analyzed to reveal characteristics of the new signals. Characteristics of the new signals may be compare to characteristics of the baseline signals to determine if the new signals differ from the baselines signals by more than a threshold amount. One or more actions may be executed in response to determining that the new signals differ from the baseline signals by more than the threshold amount.

A dynamic aperture is disclosed. A dynamic aperture includes a base layer, a conductive structure disposed on the base layer, and a layer of a material having a dynamically controllable electrical conductivity that is disposed over the base layer and the conductive structure. A transmission profile of the dynamic aperture is determined by a combination of the conductive structure and the layer of the material. The transmission profile is dynamically alterable by controlling the electrical conductivity of the layer of the material.

A dynamic aperture is disclosed. A dynamic aperture includes a base layer, a conductive structure disposed on the base layer, and a layer of a material having a dynamically controllable electrical conductivity that is disposed over the base layer and the conductive structure. A transmission profile of the dynamic aperture is determined by a combination of the conductive structure and the layer of the material. The transmission profile is dynamically alterable by controlling the electrical conductivity of the layer of the material.

The disclosure described herein configures a multi-narrowband transceiver for communication within the television white space (TVWS) frequency spectrum using a log periodic filter, wherein the log periodic filter comprises a plurality of filter elements each having a filter frequency increasing periodically in a same frequency increasing factor (K). Each filter of the plurality of filter elements is configured to filter out second harmonics in a defined frequency range. The disclosure determines a TVWS channel for the communication and switches to a filter element of the plurality of filter elements corresponding to the determined TVWS channel. Data is transmitted and/or received over the TVWS channel using the filter element, thereby allowing narrowband communication over the TVWS channel.

An electronic apparatus is provided. The electronic apparatus includes a housing having a first surface, an antenna formed on the first surface, an interface that is connectable to an external terminal of an external apparatus via an audio connector formed on the first surface and configured to provide a detection signal indicating whether a connection with the external terminal is made, a processor configured to process an audio signal received from the external terminal of the external apparatus via the interface, a signal line extending from the interface, a noise filter connected to the processor, a matching element, and a switch configured to electrically connect one of the noise filter or the matching element to the signal line, based on the detection signal.

An electronic apparatus is provided. The electronic apparatus includes a housing having a first surface, an antenna formed on the first surface, an interface that is connectable to an external terminal of an external apparatus via an audio connector formed on the first surface and configured to provide a detection signal indicating whether a connection with the external terminal is made, a processor configured to process an audio signal received from the external terminal of the external apparatus via the interface, a signal line extending from the interface, a noise filter connected to the processor, a matching element, and a switch configured to electrically connect one of the noise filter or the matching element to the signal line, based on the detection signal.

Certain aspects involve a wideband remote unit. The wideband remote unit can include one or more antennas and an analog-to-digital converter (“ADC”). The antenna can receive wideband signals. The wideband signals can include an uplink RF signal and a leaked downlink RF signal. The uplink RF signal can have an uplink signal power at or near a noise level. The leaked downlink RF signal can have a downlink signal power greater than the uplink signal power. The ADC can convert the received wideband signals to digital RF signals representing the uplink signal and the downlink signal. The wideband remote unit can transmit the digital RF signals to a unit of a DAS that is in communication with a base station.

Certain aspects involve a wideband remote unit. The wideband remote unit can include one or more antennas and an analog-to-digital converter (“ADC”). The antenna can receive wideband signals. The wideband signals can include an uplink RF signal and a leaked downlink RF signal. The uplink RF signal can have an uplink signal power at or near a noise level. The leaked downlink RF signal can have a downlink signal power greater than the uplink signal power. The ADC can convert the received wideband signals to digital RF signals representing the uplink signal and the downlink signal. The wideband remote unit can transmit the digital RF signals to a unit of a DAS that is in communication with a base station.

A vibratory detector for detecting a vibratory signal from one or more feeders. A processor is in communication with the vibratory detector and configured for determining from at least one characteristic of the vibratory signal a possible action event, and for determining from a pattern of possible action events a likely action event. A warning device is in communication with the processor for providing an output in response to the likely action event. In an embodiment, the at least one characteristic of the vibratory signal can comprise the frequency or magnitude of the vibratory signal.