Abstract: An apparatus including: a radio transmitter configured to transmit radio signals that are at least partially reflected by a human body; one or more radio receivers configured to receive the transmitted radio signals after having been at least partially reflected by a human body of a user; a gesture detector configured to detect a predetermined time-varying modulation that is present in the received radio signals compared to the transmitted radio signals; and a controller configured to interpret the predetermined time-varying modulation as a predetermined user input command and change the operation of the apparatus.

Abstract: A processor (108) configured to associate (302) RFID data (124) obtained from a scene (202) with captured image data for the scene (202). The association can be displayed (304) to a user to enable a user to select (306), using the image data, which RFID data to interact (308) with.

Abstract: Embodiments provide methods, devices, circuitry and systems for supporting or implementing functionality to provide a filtering circuit, and for providing a transmitter, receiver or transceiver incorporating the same. One embodiment provides a circuit for filtering signals. The circuit outputs a plurality of signals at a plurality of frequencies, each of the signals being attenuated by an amount determined by the frequency of the signal. The circuit attenuates signals output at a first frequency by an amount which is low relative to the attenuation of signals output at frequencies other than the first frequency. The circuit further attenuates signals output at a second frequency by an amount which is high relative to the attenuation of signals output at frequencies other than the second frequency. Responsive to a change in the control signal, the circuit changes the first and second frequencies while maintaining a fixed ratio between the first and second frequencies.

Abstract: Circuitry for use in a direct conversion transmitting or receiving chains includes mixing circuitry which converts baseband signal to radio frequency or vice versa. A local oscillator to provide a signal having a first component and a second component at a harmonic of the first to the mixing circuitry. The circuitry has a filter circuit which attenuates signals output at a first frequency by an amount which is low relative and which attenuates signals output at a second frequency by an amount which is high, both being relative to the attenuation of signals output at frequencies other than the second frequency. The filter circuit is tunable to vary the frequencies, and configured such that the second frequency is maintained at a predetermined integer multiple of the first frequency.

Abstract: A super-regenerative transceiver that has an antenna interface for an antenna is self-tuned with a self-tuning unit configured. The self-tuning unit makes the transceiver to repeatedly perform a self-tuning cycle until the amplitude meets a predetermined detection condition or a predetermined criterion is met. The self-tuning cycle involves the following: transmitting to the antenna a probe signal with one or more pulses; receiving from the antenna a ringing detection signal; determining if the ringing detection signal reflects tails of the probe signal with amplitude meeting a predetermined detection condition; and adjusting of the tuning of the super-regenerative transceiver if the amplitude does not meet the predetermined detection condition.

Abstract: A wideband signal comprising both a wanted signal and narrowband interference is received in a wideband receiver. The receiver comprises an interference detection unit comprising a set of sub-band filters. With the aid of the sub-band filters the received signal is processed to detect a sub-band containing the narrowband interference in time domain.

Abstract: A processor (108) configured to associate (302) RFID data (124) obtained from a scene (202) with captured image data for the scene (202). The association can be displayed (304) to a user to enable a user to select (306), using the image data, which RFID data to interact (308) with.

Abstract: A super-regenerative transceiver that has an antenna interface for an antenna is self-tuned with a self-tuning unit configured. The self-tuning unit makes the transceiver to repeatedly perform a self-tuning cycle until the amplitude meets a predetermined detection condition or a predetermined criterion is met. The self-tuning cycle involves the following: transmitting to the antenna a probe signal with one or more pulses; receiving from the antenna a ringing detection signal; determining if the ringing detection signal reflects tails of the probe signal with amplitude meeting a predetermined detection condition; and adjusting of the tuning of the super-regenerative transceiver if the amplitude does not meet the predetermined detection condition.

Abstract: An apparatus including one or more radio transmitters configured to transmit radio signals that are at least partially reflected by an object or objects moving as a consequence of a gesture; multiple radio receivers configured to receive the transmitted radio signals after having been at least partially reflected by an object or objects moving as a consequence of a gesture; a detector configured to detect an attribute of the received signals, for each receiver, that varies with the position of the object or objects moving as a consequence of the gesture; and a controller configured to interpret the detected attributes, for the receivers, as a user input associated with the gesture.

Abstract: An apparatus including: a radio transmitter configured to transmit radio signals that are at least partially reflected by a human body; one or more radio receivers configured to receive the transmitted radio signals after having been at least partially reflected by a human body of a user; a gesture detector configured to detect a predetermined time-varying modulation that is present in the received radio signals compared to the transmitted radio signals; and a controller configured to interpret the predetermined time-varying modulation as a predetermined user input command and change the operation of the apparatus.

Abstract: A wideband signal comprising both a wanted signal and narrowband interference is received in a wideband receiver. The receiver comprises an interference detection unit comprising a set of sub-band filters. With the aid of the sub-band filters the received signal is processed to detect a sub-band containing the narrowband interference in time domain.