A measurement apparatus is provided for measuring signals from a device under test (DUT). The measurement apparatus includes a time domain receiver configured to receive from the DUT a time domain signal in a time domain; a logic domain receiver configured to receive from the DUT a logical signal comprising logic levels over time; a frequency domain receiver configured to receive from the DUT a frequency domain signal in a frequency domain through frequency downconversion; and a controller coupled to the logic domain receiver, and configured to determine the logic levels over time of the logical signal and to control at least one parameter of the frequency domain signal in response to the determined logic levels.

A measurement apparatus is provided for measuring signals from a device under test (DUT). The measurement apparatus includes a time domain receiver configured to receive from the DUT a time domain signal in a time domain; a logic domain receiver configured to receive from the DUT a logical signal comprising logic levels over time; a frequency domain receiver configured to receive from the DUT a frequency domain signal in a frequency domain through frequency downconversion; and a controller coupled to the logic domain receiver, and configured to determine the logic levels over time of the logical signal and to control at least one parameter of the frequency domain signal in response to the determined logic levels.

The invention relates to a method (1) for monitoring a rotating machine (100) of an aircraft, wherein a measurement signal is acquired from the rotating machine. According to the invention, instantaneous frequencies (f.sub.K(t)) of sinusoidal components of the measurement signal are estimated, and, using a computing module (12), a plurality of successive iterations are carried out in each of which: complex envelopes of the components are updated (C1), parameters of a model of a noise of the signal are updated (C21) on the basis of the envelopes, whether the model has converged from the preceding iteration to the present iteration is tested (C4), with a view to: o if not, carrying out a new iteration, o if so, performing a computation (D) of the complex envelopes on the basis of the iterations that have been carried out.

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.

A wireless charging system is configured to charge one or more receiver devices simultaneously. The wireless charging system includes multiple coils that may be driven independently based on a feedback system with one or more feedback channels. Each coil is driven by a coil driving signal selected based on a set of target characteristics. A coil drive circuit receives an input of a pulse width modulation (PWM) signal and outputs the coil driving signal to a corresponding coil.

A wireless charging system is configured to charge one or more receiver devices simultaneously. The wireless charging system includes multiple coils that may be driven independently based on a feedback system with one or more feedback channels. Each coil is driven by a coil driving signal selected based on a set of target characteristics. A coil drive circuit receives an input of a pulse width modulation (PWM) signal and outputs the coil driving signal to a corresponding coil.

An environmental frequency sensing device, includes logic that performs signal strength (SS) level separation on a received band of frequencies to produce SS level separated frequencies. The logic performs frequency grouping on the SS level separated frequencies for each signal strength level to produce magnitude information for each grouping. The logic generates peak data by detecting peaks of the produced magnitude information. The logic generates an edge event indicating a signal edge based on arrival or departure of a given peak and compares, on a frequency basis, generated edges to stored fingerprint data of a signal of interest. Based on the comparison, the logic provides detected signal data indicating current use of a range of frequencies in an environment.

An environmental frequency sensing device, includes logic that performs signal strength (SS) level separation on a received band of frequencies to produce SS level separated frequencies. The logic performs frequency grouping on the SS level separated frequencies for each signal strength level to produce magnitude information for each grouping. The logic generates peak data by detecting peaks of the produced magnitude information. The logic generates an edge event indicating a signal edge based on arrival or departure of a given peak and compares, on a frequency basis, generated edges to stored fingerprint data of a signal of interest. Based on the comparison, the logic provides detected signal data indicating current use of a range of frequencies in an environment.

A real-time spectrum analyzer (RTSA) includes an analog-to-digital converter (ADC) configured to convert in real-time an input analog signal into a digital input data stream, a digital down-converter (DDC) configured to down-convert in real-time the digital input data stream into a down-converted input data stream, a fast Fourier transform (FFT) unit configured to generate in real-time FFTs of the down-converted input data stream, an acquisition memory circuit configured to store in real-time the FFTs generated by the FFT unit, and an analyzer configured to read in non-real time the FFTs stored in the acquisition memory.