16 results about "Ring down" patented technology

A method of operating a PMUT electro-acoustical transducer, the method comprising: applying over an excitation interval to the transducer an excitation signal which is configured to emit corresponding ultrasound pulses towards a surrounding space, acquiring at a receiver reflected ultrasound pulses as reflected in said surrounding space, generating a reference echo signal, performing a cross-correlation of said acquired received ultrasound pulses with said reference echo signal, performing a measurement based on the cross-correlation results, in particular a measurement of the time of flight of the ultrasound pulses, wherein said reference echo is obtained by finding an oscillation frequency of the transmitter on the basis of a transmitter ringdown signal, finding an oscillation frequency of the receiver on the basis of a receiver ringdown signal, performing a frequency tuning respectively on the transmitter and the receiver on the basis of said respective oscillation frequencies, then sweeping an input frequency of the transmitter to find a frequency of the maximum displacement in the ringdown signal, performing a frequency tuning of the receiver at said frequency of the maximum displacement in the ringdown signal of the transmitter.

A ring drop toy has a housing defining a vertical passage, a rocker mounted to the housing beneath the vertical passage between two, oppositely-directed housing exits, and a ring sized to be dropped down the vertical passage to engage the rocker. The rocker is mounted to pivot about a horizontal axis between two pivot orientations, configured such that dropping of the ring down the vertical passage causes the ring to be rolled out of one of the housing exits and causes the rocker to toggle between the pivot orientations such that a next dropping of a ring down the vertical passage will cause the ring to be rolled out of the other of the housing exits in the opposite direction.

A stinging sound bracelet (100) has a band (102) and a plurality of bells (104a-c) at spaced apart locations (112a-c). The belt (102) forms a continuous loop. Each bell (104a-c) has a bell frame (114), a bell housing (116), and a ringing device (118). The bell frame (114) has two opposite ends (120) defining a slot (122) through which the strap (102) passes, and the bell frame (114) further defines an aperture (128) between the two opposite ends (120). A bell housing (116) is secured to the bell frame (114) and disposed within the aperture (128). A ringing device (118) is disposed within the bell housing (116), and the ringing device (118) is free to move everywhere to strike the bell housing (116) when the bite sound bracelet (100) is shaken. The bell housing (116) is oval-shaped with a maximum lateral dimension (146) aligned with the aperture (128) and a minimum lateral dimension (148) oriented perpendicular to the aperture (128).

The application provides a micro-ring resonance gas concentration detection system and method based on a quantum ringing effect, which can be applied to the technical field of gas concentration detection. The system comprises: an optical frequency comb emitting a first laser beam; a micro-ring resonance cavity enabling the first laser beam to interact with a gas based on an evanescent field effect to obtain a modulated light beam; a double-swing solid angle mirror interferometer delaying a reference light beam and a signal light beam corresponding to the modulated light, and adjusting the frequency of the signal light beam during the delay process, so that the delayed reference light beam and the signal light beam interfere with each other; a detector detecting the interference light beam to obtain a detection signal; a processor performing band-pass filtering on data corresponding to sampling points in the detection signal; performing envelope detection on the detection signal component obtained by filtering to obtain a decay time; and obtaining the concentration of the measured gas according to a plurality of decay times corresponding to a plurality of laser frequencies, thereby improving the gas concentration detection precision and reducing the system volume.

A detection signal processing device configured to process a detection signal received from a detector for identifying the presence of one or more target substances in a sample, the device comprising: a detection signal coupling arranged to receive a detection signal from the detector; an amplifier and an integrating capacitor, the amplifier having input terminals, at least one of which is coupled to the detection signal; and a ringing circuit capacitively coupled to at least one input of the amplifier and selectively operable to apply a ringing signal to the at least one input of the amplifier to cause an amplifier protection circuit of the amplifier to reset the integrating capacitor.

The invention discloses a transmitter and a ringing suppression circuit and method. The transmitter includes a positive differential terminal and a negative differential terminal. The ringing suppression circuit comprises a bias current module used for generating bias current; the pull-down module is used for generating pull-down voltage corresponding to common-mode voltage according to the bias current; the pull-up module is used for generating pull-up voltage corresponding to common-mode voltage according to the bias current, and when the transmitter jumps from the dominant state to the implicit state, the ringing suppression circuit clamps the positive differential terminal and the negative differential terminal to the common-mode voltage. The ringing suppression circuit generates a driving current for ringing suppression according to a bias current to improve a current driving capability, and dynamically enables a ringing suppression function according to a signal state change to reduce static power consumption.

The invention provides a micro-ring resonance gas concentration detection system and method based on a quantum ringing effect, and can be applied to the technical field of gas concentration detection. The system comprises: an optical frequency comb emitting a first laser beam; the micro-ring resonant cavity enables the first laser beam to interact with gas based on an evanescent field effect to obtain a modulated light beam; the double-pendulum solid angle mirror interferometer delays the reference light beam and the signal light beam corresponding to the modulated light, and adjusts the frequency of the signal light beam in the delay process, so that the delayed reference light beam and the delayed signal light beam interfere with each other; the detector detects the interference light beam to obtain a detection signal; the processor carries out band-pass filtering on data corresponding to the sampling points in the detection signals; envelope detection is carried out on the detection signal component obtained through filtering, and ring-down time is obtained; according to the multiple ring-down times corresponding to the multiple laser frequencies, the concentration of the to-be-detected gas is obtained, the gas concentration detection precision is improved, and the system size is reduced.

Provided is a self-adaptive single-array-element endoscopic ultrasonic ringing artifact removal method based on time-frequency analysis filtering. The method is as follows: acquiring endoscopic single-array-element ultrasonic imaging original data, and performing time-frequency spectrum analysis on adjacent frame signals; according to an optical flow method, obtaining a time-frequency spectrum mutation condition of a time-frequency spectrum of a signal to be processed relative to a reference signal; determining a threshold coefficient and a frequency spectrum distribution condition factor, and determining parameters of a time-frequency filter by means of the two parameters; performing time-frequency filtering on the signal to be processed by means of a time-frequency filter obtained by means of preliminary calculation and performing time domain recovery; performing index calculation on data after the artifact is filtered out by using time-frequency filtering and the original data, and optimizing and adjusting threshold parameters according to whether an index reaches a standard or not; and performing time-frequency filtering, time domain reconstruction, and ultrasonic endoscopic image reconstruction on the data by using a time-frequency filter parameter with the index reaching the standard. According to the method, the ringing artifact can be almost completely removed, an effective echo signal is recovered, and the structural integrity during short-distance imaging is maintained.

This invention discloses a method and system for improving the stability of a coherent dispersive spectrometer based on cross-cancellation, belonging to the field of spectral imaging technology. It includes acquiring two interference spectra with a phase difference of π in an asymmetric coherent dispersive system; separating the local spectrum and interference spectrum through addition and subtraction; performing Fourier transform on both to obtain the local spectrum and interference spectrum in the frequency domain; determining the optical path difference based on the grating line spread function and signal-to-noise ratio condition; and dividing the interference spectrum into a first component region and a second component region; determining the weights using a phase residual optimization method within the frequency range from zero to the optical path difference; and performing a weighted summation of the spectral components of the local spectrum and the first component region to obtain the mixed spectrum after cross-cancellation. This invention further improves spectral resolution through high-frequency stitching and suppresses ringing effects through equalization processing. This invention significantly improves system stability and spectral resolution without increasing system size and complexity.

The utility model discloses an installation structure of a tunnel illuminating lamp. The installation structure comprises an installation frame. When the lighting lamp body is installed, the lamp body fixedly provided with the fixing ring and the L-shaped clamping plate is pushed upwards to a proper position along the installation groove of the installation frame, and then the lamp body is rotated leftwards to drive the fixing ring and the L-shaped clamping plate to move leftwards. After the inclined opening of the L-shaped clamping plate makes contact with the inserting column, upward pressure is generated, the inserting column moves upwards, the connecting movable plate is driven to ascend along the movable groove, the reset spring is stretched, and meanwhile the linkage ring and the holding ring are driven to move upwards. When an L-shaped clamping plate moves leftwards in place, an inserting hole is located below an inserting column, extrusion force disappears, a reset spring rebounds, the inserting column, a connecting moving plate, a linkage ring and a holding ring are driven to move downwards till the inserting column makes contact with the inserting hole, the illumination lamp body can be installed and fixed, and therefore the illumination lamp has the advantage of being convenient to install and fix; and the tunnel illuminating lamp can be quickly mounted and fixed, and the mounting and fixing time of the tunnel illuminating lamp is shortened.

The present invention relates to the field of optical microcavity sensing technology, and particularly to a method for recovering the output spectral distortion caused by fast linear frequency modulation continuous wave; by introducing a spectral recovery algorithm with phase compensation, any distorted readout spectrum can be restored to its steady-state spectrum. Thanks to the long photon lifetime and photon localization characteristics, optical microcavities have become a promising high-performance sensing tool. By proposing that the ringing effect originates from the quadratic phase of the interference between the light emitted from the microcavity and the input / output of the waveguide, this quadratic phase depends on the chirp rate of the input linear frequency modulation continuous wave and is independent of the type of microcavity. After compensating for the introduced phase, any steady-state spectrum can be restored from the distorted readout spectrum, bridging the gap between the transient ringing spectrum and the steady-state spectrum, and opening up a new path for high-speed sensing, optical communication, and advanced integrated chip technology.

A ring drop toy has a housing defining a vertical passage, a rocker mounted to the housing beneath the vertical passage between two, oppositely-directed housing exits, and a ring sized to be dropped down the vertical passage to engage the rocker. The rocker is mounted to pivot about a horizontal axis between two pivot orientations, configured such that dropping of the ring down the vertical passage causes the ring to be rolled out of one of the housing exits and causes the rocker to toggle between the pivot orientations such that a next dropping of a ring down the vertical passage will cause the ring to be rolled out of the other of the housing exits in the opposite direction.

A wind-driven sound and light device has at least one resonant element, a striker configured to strike the at least one resonant element in response to wind, thereby producing a ringing event. A lighting element comprising an illuminator is associated with each resonant element. The device also has a power source, a ring event sensor, and an illumination processing system. The ring event sensor produces a data signal in response to a ring effect The illumination processing system is configured to receive the data signal from the ring event sensor and, in response to the data signal, cause the circuit arrangement to activate the illuminator of at least one of the at least one lighting element by connecting it to the power source.

An example method includes transmitting, by a single ultrasound transducer, an incident ultrasound signal and detecting, at least partially from an object within a ringdown range of the single ultrasound transducer and by the single ultrasound transducer, a received ultrasound signal. A ringdown artifact is removed from data indicative of the received ultrasound signal. Based on removing the ringdown artifact, the object is analyzed based on the data.

The present application provides a method and electronic device for removing image ringing noise. The method can utilize the characteristics of the one-dimensional grayscale value of the ringing noise in the first image, which fluctuates periodically with decreasing amplitude and appears attached to strong edges, to more accurately locate the target area including the ringing noise in the first image. The method can also record the target area according to a mask matrix, and then filter only the target area in the first image according to the instructions of the mask matrix, while retaining other parts that do not include the ringing noise, avoiding damage to the structure and texture information of the first image, thereby more accurately removing the ringing noise in the image and improving the restoration quality and appearance of the processed image.

The present application provides an anti-theft system of an acoustic magnetic (AM) method capable of expanding the allowable range of the resonance frequency of a tag. The anti-theft system of the acoustic magnetic method includes a transmitting section 20, a tag 10, a receiving section 30, and a tag detection processing section 42. The transmitting section 20 transmits an excitation pulse signal during a transmission period. The tag 10 resonates due to the excitation pulse signal transmitted from the transmitting section 20 and outputs a ring-down signal. The receiving section 30 receives the ring-down signal during a reception period after the transmission period. The tag detection processing section 42 detects the tag 10 based on the ring-down signal received by the receiving section 30. The transmission period in which the excitation pulse signal of the 57 kHz band is transmitted and the transmission period in which the excitation pulse signal of the 58 kHz band is transmitted are included in each certain period.