A period estimation apparatus includes processing circuitry configured to extract candidate periods being a target of period determination from an input pulse train, use at least one of the candidate periods extracted to determine whether the at least one of the candidate periods exists as an actual period, and, when determining that the at least one of the candidate periods does not exist as the actual period, suspend the period determination for the at least one of the candidate periods, perform the period determination for the at least one of the candidate periods determined to exist as the actual period, generate a pseudo periodic pulse train, adjust, based on a differential value between the pseudo periodic pulse train generated and the input pulse train, a pulse position of the pseudo periodic pulse train, and detect a periodic pulse train according to results of the period determination and adjustment.

A system includes electronic circuitry that receives a self-clocking differential signal comprising a data signal encoded with a clock signal at a dock frequency. The electronic circuitry is configured to recover, from the self-docking differential signal, the data signal and the dock signal. Then, based on the recovered dock signal, the electronic circuitry is configured to wirelessly transmit, to an implantable stimulator implanted within a recipient, a forward telemetry signal representing data recovered from the data signal. Corresponding systems, methods, devices, and application specific integrated circuits (ASICs) are also disclosed.

A system includes electronic circuitry that receives a self-clocking differential signal comprising a data signal encoded with a clock signal at a dock frequency. The electronic circuitry is configured to recover, from the self-docking differential signal, the data signal and the dock signal. Then, based on the recovered dock signal, the electronic circuitry is configured to wirelessly transmit, to an implantable stimulator implanted within a recipient, a forward telemetry signal representing data recovered from the data signal. Corresponding systems, methods, devices, and application specific integrated circuits (ASICs) are also disclosed.

A system for low power chemical sensing can include a voltage shift unit which receives a voltage signal from a chemical sensor unit. The voltage signal can be determined by a concentration of an analyte. The voltage shift unit can transform the voltage signal to an input voltage signal, and send the input voltage signal to a plurality of frequency selective surface (FSS) units of an FSS array. The FSS array can communicate a radio frequency (RF) signal in an Institute of Electrical and Electronics Engineers (IEEE) S band with a resonant frequency based on the input voltage to provide the concentration of the analyte.

A system for low power chemical sensing can include a voltage shift unit which receives a voltage signal from a chemical sensor unit. The voltage signal can be determined by a concentration of an analyte. The voltage shift unit can transform the voltage signal to an input voltage signal, and send the input voltage signal to a plurality of frequency selective surface (FSS) units of an FSS array. The FSS array can communicate a radio frequency (RF) signal in an Institute of Electrical and Electronics Engineers (IEEE) S band with a resonant frequency based on the input voltage to provide the concentration of the analyte.

A method of imaging a turbine engine component with a first surface and a second surface that is spaced from the first surface. The turbine engine component includes a plurality of holes with inlets formed in the second surface or interior that are fluidly coupled to outlets formed in the first surface or exterior. The method includes determining at least one fluid frequency, determining at least one sampling frequency, and pulsing fluid through at least a portion of the interior of turbine engine component while imaging the turbine engine component.

Systems and methods may be used to measure a frequency of a power delivery system and/or of a supply signal transmitted to a load. A system may record an input waveform, determine a frequency of the input waveform at a present time based at least in part on the input waveform and a derivative of the input waveform, and control an operation of a power delivery system based at least in part on the determined frequency.

Systems and methods may be used to measure a frequency of a power delivery system and/or of a supply signal transmitted to a load. A system may record an input waveform, determine a frequency of the input waveform at a present time based at least in part on the input waveform and a derivative of the input waveform, and control an operation of a power delivery system based at least in part on the determined frequency.

A frequency measurement method and a system thereof are provided. The method includes: generating to-be-detected emergent light under an action of the electro-optical crystal when a light source irradiates an electro-optical crystal disposed in the microwave electric field; detecting, by a single-photon detector, the to-be-detected emergent light to obtain a detection result of the single-photon detector; and determining a frequency of the microwave signal based on the detection result of the single-photon detector and a Fourier transform algorithm.

A frequency measurement method and a system thereof are provided. The method includes: generating to-be-detected emergent light under an action of the electro-optical crystal when a light source irradiates an electro-optical crystal disposed in the microwave electric field; detecting, by a single-photon detector, the to-be-detected emergent light to obtain a detection result of the single-photon detector; and determining a frequency of the microwave signal based on the detection result of the single-photon detector and a Fourier transform algorithm.