4results about How to "Accurate frequency" patented technology

The application provides a radio frequency signal frequency calibration method, device, medium and product, relates to the technical field of radio frequency signal processing, and the method comprises the steps of controlling a frequency generation circuit to output a to-be-calibrated radio frequency signal, sampling in a continuous sub-time window of a calibration period time window, calculating a difference value between an actual pulse number and a theoretical pulse number to obtain a deviation pulse number and constructing a cumulative error sequence. A first-order coefficient and a second-order coefficient are extracted through second-order polynomial fitting. If only the first-order coefficient is greater than a first-order coefficient threshold value, a static compensation amount is calculated based on the first-order coefficient to correct the frequency; if only the second-order coefficient is greater than a second-order coefficient threshold value, a dynamic drift compensation amount is calculated based on the second-order coefficient to correct the frequency; if both are greater than the threshold value, the dynamic drift compensation amount and the final static compensation amount are calculated to correct the frequency. The scheme solves the technical problem that radio frequency signal frequency error components are complex, resulting in insufficient calibration accuracy.

The application provides a silicon photon gyroscope stable control method and silicon photon gyroscope under a rapid temperature changing condition, and the stable control method comprises the following steps: setting a light source frequency control digital interval; controlling the light source temperature to make the light source center frequency enter a resonance valley, and recording the valley entering temperature; collecting the CW and CCW resonance signals output after the light source enters the resonance cavity, and calculating the sum of the clockwise and counterclockwise resonance frequency and the light source center frequency deviation; and calculating the feedback control light source current and temperature according to the light source frequency control digital interval where the sum of the frequency deviation is located. Through the adaptive control of the light source current and temperature, the light source center frequency can quickly track the resonance frequency of the resonance cavity under the rapid temperature changing condition, the stable control of the gyroscope is realized, and the gyroscope output accuracy is improved.

The utility model relates to a novel integrated audiometer, including box body, be equipped with control panel on the front side of box body, be equipped with cover on the back of box body, be equipped with vibration block and vibration piece in the box body, vibration block is connected with control panel electricity, and vibration piece is laid in the box body, wherein, vibration piece includes the connecting portion of periphery and the vibration portion in the middle part, and the connecting portion is detachably connected with the box body, and the middle part of both ends of vibration portion along the length direction is connected with the connecting portion, and the other edge of vibration portion all leaves the gap between the connecting portion, and then make vibration piece form the through slot of rectangle frame shape, and vibration block corresponds to the middle part of both sides of vibration portion along the width direction, the convex that forms the through slot is adapted to in the middle part of cover inside, thereby make the sound source room between convex and vibration portion, and the notch is left at the corresponding sound source room of cover outside, the button is still equipped on the side of box body, and the button is connected with control panel electricity.

Disclosed are a frequency synchronization method, apparatus and device, belonging to the technical field of communications, the frequency synchronization method comprising: a first device sending a first synchronization signal, the first synchronization signal satisfying at least one of the following: the first device sending the first synchronization signal, the first synchronization signal satisfies at least one of the following conditions: the first synchronization signal is a single-frequency signal; the center frequency or carrier wave of the first synchronization signal is a first target frequency; the bandwidth of the first synchronization signal is smaller than a preset bandwidth; the transmission time of the first synchronization signal is greater than first preset time; the first synchronization signal is continuously at a high level within the first preset time; the first synchronization signal is at least used for frequency synchronization of a second device.