Nuclear Magnetic Resonant Imaging (also called Magnetic Resonant Imaging or MRI) devices which are implantable, internal or insertable are provided. The disclosure describes ways to miniaturize, simplify, calibrate, cool, and increase the utility of MRI systems for structural investigative purposes, and for biological investigation and potential treatment. It teaches use of target objects of fixed size, shape and position for calibration and comparison to obtain accurate images. It further teaches cooling of objects under test by electrically conductive leads or electrically isolated leads; varying the magnetic field of the probe to move chemicals or ferrous metallic objects within the subject. The invention also teaches comparison of objects using review of the frequency components of a received signal rather than by a pictorial representation.

A system (800) for determining frequency spacings to prevent intermodulation distortion signal interference is provided. The system (800) includes a sensor assembly (810) and a meter verification module (820) communicatively coupled to the sensor assembly (810). The meter verification module (820) is configured to determine a frequency of a first signal to be applied to a sensor assembly (810) of a vibratory meter and set a demodulation window about the frequency of the first signal. The meter verification module (800) is also configured to determine a frequency of the second signal to be applied to the sensor assembly such that a frequency of an intermodulation distortion signal generated by the first signal and the second signal is outside the demodulation window.

A method and apparatus select an optimal frequency band of a plurality of frequency bands of a multi-band voltage-controlled oscillator (VCO) to achieve a particular output frequency from the multi-band VCO. The optimal frequency band is selected, automatically, based on performing a one-point calibration phase followed by a multi-point calibration phase. The one-point calibration phase produces an initial frequency band selection and the multi-point calibration phase selects the optimal frequency band from a group of frequency bands including the initial frequency band selection, a higher frequency band consecutively higher in frequency relative to the initial frequency band selection, and a lower frequency band consecutively lower in frequency relative to the initial frequency band selection.

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.

The implementation of modal processors, which involve the parallel combination resonant filters, may be costly for applications such as artificial reverberation that can require thousands of modes. In one embodiment, the input signal is decomposed into a plurality of subbands, the outputs of which are downsampled. In each downsampled band, resonant filters are applied at the downsampled sampling rate, and their output is upsampled and filtered to form the band output.

A method for determining a quality factor of an electrostatically actuated oscillator, the oscillator having a resonance frequency, the method including generating an excitation voltage defined as being the sum of a sinusoidal voltage and a voltage pulse; applying the excitation voltage at the input of the oscillator; acquiring in the time domain a response voltage present at the output of the oscillator after having ceased applying the excitation voltage at the input of the oscillator; determining the quality factor of the oscillator from the response voltage acquired at the output of the oscillator.

A method for determining a quality factor of an electrostatically actuated oscillator, the oscillator having a resonance frequency, the method including generating an excitation voltage defined as being the sum of a sinusoidal voltage and a voltage pulse; applying the excitation voltage at the input of the oscillator; acquiring in the time domain a response voltage present at the output of the oscillator after having ceased applying the excitation voltage at the input of the oscillator; determining the quality factor of the oscillator from the response voltage acquired at the output of the oscillator.

In certain embodiments, an apparatus includes a sensing element having a capacitance to a first reference voltage. The capacitance is variable as a function of a proximity of an object to the sensing element. The apparatus further includes a sample capacitor connected to the sensing element and control circuitry connected to the sample capacitor. The control circuitry is configured to supply a charge to the sample capacitor and the sensing element and discharge the sensing element. The control circuitry is further configured to provide, in response to the discharge of the sensing element, a signal indicative of the capacitance to the first reference voltage of the sensing element. The control circuitry is further configured to process the signal to detect a change in the capacitance to the first reference voltage as indicative of the proximity of the object to the sensing element.

Nuclear Magnetic Resonant Imaging (also called Magnetic Resonant Imaging or MRI) devices which are implantable, internal or insertable are provided. The disclosure describes ways to miniaturize, simplify, calibrate, cool, and increase the utility of MRI systems for structural investigative purposes, and for biological investigation and potential treatment. It teaches use of target objects of fixed size, shape and position for calibration and comparison to obtain accurate images. It further teaches cooling of objects under test by electrically conductive leads or electrically isolated leads; varying the magnetic field of the probe to move chemicals or ferrous metallic objects within the subject. The invention also teaches comparison of objects using review of the frequency components of a received signal rather than by a pictorial representation.

The present disclosure provides a method and apparatus for adjusting a qubit frequency, an electronic device and a readable storage medium. For at least two frequency-adjustable qubits in a multi-bit quantum chip, a corresponding upper-limit/lower-limit setting parameter is determined through an upper-limit frequency and a lower-limit frequency centered by a target frequency and in combination with a fitting corresponding relationship, thus determining a rate between a change of a frequency and a change of a setting parameter. After the target setting parameter is set for each qubit, the parameter for another qubit directly coupled to the qubit is adjusted to the upper-limit setting parameter and the lower-limit setting parameter, and then the actual frequency of a current qubit is determined according to a current upper-limit frequency and a current lower-limit frequency.