1827 results about "Synchronous detection" patented technology

The invention discloses an audio/video synchronization detection method, an audio/video synchronization detection system, a voice detection method and a voice detection system. The audio/video synchronization detection method comprises the following steps of: determining the staring play time of an audio band matched with audio reference data and the staring play time of a video frame matched with video reference data in an audio/video file played at a target terminal; according to the staring play time of the audio band matched with the audio reference data and the staring play time of the video frame matched with the video reference data, determining audio/video play time difference when the audio/video file is played at the target terminal; acquiring audio/video play time difference when the audio/video file is played at a source terminal; and according to audio/video play time difference when the audio/video file is played at the source terminal and at the target terminal, determining an audio/video synchronization condition when the audio/video file is played at the target terminal. By the invention, accuracy of audio/video synchronization detection can be improved.

An inductive proximity sensor is disclosed. The proximity sensor includes a resonator with a bifurcated inductance coupled to a plurality of transimpedance amplifiers. A portion of the resonator is configured to generate eddy currents in a target containing metal. In various embodiments, the transimpedance amplifiers provide signals associated with eddy currents to a synchronous detector. Apparatus and methods for operating the inductive proximity sensor are disclosed.

A multi-path signal interference cancellation system cancels multiple time delayed signal components of a multi-path interference signal received by a receive antenna and carried on a receiver transmission line of a radio receiver system. The interference cancellation system includes a plurality of adaptive interference canceller circuits, each of which has a synchronous detector, a signal controller and an integrator as essential parts of closed control loops defined by the canceller circuits. The integrator has gain and bandwidth characteristics associated therewith which are adjustable to adjust the gain and bandwidth of each closed control loop. An intensity profile of the multi-path interference signal is generated and stored in a memory. An intensity profile signal from the memory is provided to the integrator of each adaptive interference canceller circuit to adjust the gain and bandwidth of the integrator and the loop in which it is situated to maximize the error detection residual signal-to-noise ratio of each adaptive interference canceller circuit. Each adaptive interference canceller circuit generates a cancellation signal from which a synthesized cancellation signal is generated and effectively injected onto the receiver transmission line to cancel the multiple time delayed signal components of the multi-path interference signal carried thereon so that the radio receiver of the radio receiver system only receives a desired signal.

A FM-CW radar system comprises a frequency modulated continuous wave digital generator that produces both in-phase (I) and quadrature-phase (Q) outputs to orthogonally oriented transmitter antennas. A linearly polarized beam is output from a switched antenna array that allows a variety of I-and-Q pairs of bowtie antennas to be alternately connected to the transmitter and receiver. The receiver inputs I-and-Q signals from another bowtie antenna in the array and mixes these with samples from the transmitter. Such synchronous detection produces I-and-Q beat frequency products that are sampled by dual analog-to-digital converters (ADC's). The digital samples receive four kinds of compensation, including frequency-and-phase, wiring delay, and fast Fourier transform (FFT). The compensated samples are then digitally converted by an FFT-unit into time-domain signals. Such can then be processed conventionally for range information to the target that has returned the FM-CW echo signal.

Codes to be detected can be identified at high speed. The supply of the data shift clock (DCLK1) to be given to the matched filter (82) is stopped at desired timing to hold the received signal (S10) and replica code generated at the correlation coefficient generator (83) is switched to the first, second or third replica code at desired timing to detect the correlation value of that time. Thereby, the second code, the third code and the first code are detected in order to detect the timing and the code type of the first code. Therefore, each correlation detection can be conducted at the same timing since the matched filter conducts the correlation detection at high speed holding the received signal and thus, the first code included in the received signal can be identified at higher speed than before.

An optical axis of at least one surface of a resin-made diffracting lens is shifted in a main scanning direction with respect to an incident beam. A synchronous detection can cancel a problem of a misalignment in the main scanning direction due to a temperature variation. A light reflected from a second surface of the resin-made diffractive lens condenses on a position that is displaced in an optical axis direction from an optical beam outgoing point of a semiconductor laser, and thereby the light reflected again from the semiconductor laser does not form an image on a scanned surface and an impact on the image becomes low.

A multi-modal ground penetrating radar includes a radar set configured to launch predistorted double-sideband (DSB) suppressed-carrier modulated continuous waves (CW) to illuminate and penetrate a ground surface. A variable frequency modulator is connected to modulate a continuous wave (CW) carrier frequency generator within the radar set to yield a double-sideband suppressed carrier output. A lateral single-file array of antennas is configured to be flown closely over the surface of the ground. A multiplexing switch is connected to the array of antennas and configured to selectively switch individual ones of the antennas to the radar set. Any early arriving signals returned from geologic clutter and surface reflections are suppressed in synchronous detection in relation to signals received by the array of antennas from less shallow depths. Interesting objects below the ground surface are detected and located by the late arriving signal reflections.

The invention discloses a robot propulsion mechanism for a blood vessel intervention operation. The mechanism is used for an end effector for a robot for the blood vessel intervention operation and comprises an axial feed component which is used for propelling a conduit, a circumferential rotating component which is used for changing the advancing direction of the conduit and a detection component which is used for detecting the advancing distance of the conduit, wherein the detection component and the axial feed component are connected into a whole by a connecting rod, are maintained to be parallel with each other, and carry out synchronously feeding and rotation; the axial feed component comprises a pair of driving rolling wheels which synchronously rotate in reverse directions, and a first arm for clamping the conduit is formed; the detection component comprises a pair of driven wheels, and a second arm for clamping the conduit is formed; the circumferential rotating component comprises an inside engaged gear and a rotary gear, the inside engaged gear is fixed with the axial feed component and the detection component, the rotary gear is driven by a rotating motor, and the inside engaged gear is engaged with the rotary gear. The invention has the advantages of small volume, compact structure and convenient operation and maintenance, can realize double-arm clamp for the conduit, and can achieve the spiral propulsion and synchronous detection of the conduit.

A large-capacity CDMA transmission system that can realize communication with a moving unit such as an automobile, transmitting more quantity of information than the conventional system without increasing the occupied band width, using the same or narrower frequency band width.

This system assumes the code division multiple access (CDMA) transmission system for simultaneous multiple communication, which performs phase modulation on a carrier signal while maintaining a phase of the carrier signal in a predetermined period at a predetermined value, so as to generate a primary modulated wave, and then, multiplies the obtained primary modulated wave by a spread code sequence. On the transmitting side, a differential coding phase modulation (DPSK) is employed to generate a primary modulated wave. On the other hand, on the receiving side, a quasi-synchronous detection and difference operation are utilized to detect the phase difference between the last symbol interval and the current symbol interval, and the detected phase difference is given as the information of the current symbol interval.

Optical apparatuses are provided that use near-field light, where high spatial resolution and high sensitivity are made compatible. Highly intense near-field light is generated in a narrow area using localized plasmons that are produced in a metal pattern 106 in a shape that bears anisotropy and is made to irradiate a measured subject. The direction of polarization 104 of incident light 103 is modulated and signal light is subjected to synchronous detection, so that background light is removed and high sensitivity is achieved.

The invention discloses a three-dimensional display device of a full-view visual field based on a high-speed projector. The device comprises a high-speed projector, a transmission type directional diffusing screen, a reflector system, a rotation device, a sensor, a rotation synchronous detection module and an upper computer. The high-speed projector projects combined images of the horizontal 360-degree full-view visual fields of three-dimensional objects on the reflector system rotating at high speed, and the images are projected on the fixed cylindrical transmission type directional diffusing screen after the images realize the turning of light paths by the reflector system. The transmission type directional diffusing screen can control the divergence angle of outgoing light, the left eye and the right eye of an observer see images with different visual angles, and the three-dimensional display of the three-dimensional objects on the full-view visual field is realized. The rotation synchronous detection module detects a rotation signal, is communicated with the upper computer and ensures that the positions of the combined images and the position of the rotating reflector system are synchronous. The invention can realize that both eyes of the observer see images with binocular parallaxes in different positions, thereby realizing the three-dimensional display.

The invention relates to a robot for cleaning and detecting pipes. The robot comprises a mechanical system and a control system. The mechanical system is provided with a moving trolley and a cleaning operation device positioned on the trolley; the tail part of the moving trolley is provided with a detection device and a positioning guiding device, the detection device is a camera (1) and the positioning guiding device is a device capable of causing the trolley to advance in parallel; and the cleaning operation device comprises a cleaning arm (15), a cleaning arm lifting mechanism positioned at the front of the moving trolley, a cleaning arm opening-closing mechanism positioned on a second operating platform (14) and a cleaning brush mechanism positioned at the front end of the cleaning arm, the cleaning brush mechanism is provided with four small brushes (23) and a pressure sensor (22), and various small brushes are always in close contact with inner walls of the pipes by synchronous detection and feedback adjustment of the pressure sensor. The robot has the advantages of large effective working area, being capable of cleaning off a plurality of pollutants, no whipping and low cost, and being suitable for cleaning operation of a plurality of round pipes including pipes with changing pipe diameters and being capable of prolonging service life of the pipes.

The invention discloses a constant temperature synchronous amplified detection method of nucleic acid as well as an application thereof. The method comprises the following steps of: 1) mixing reactants containing the following components: a. a nucleic acid sample under test; b. a primer 1: a 3`-terminal of the primer can be hybridized at a 3`-terminal or near the 3`-terminal of the nucleic acid sample under test, and a 5`-terminal is a promotor sequence; c. a primer 2: the primer can be hybridized with a 5`-terminal of a negative strand of the nucleic acid sample under test; d. one or a plurality of fluorescent probes; e. at least one DNA polymerase relied by RNA; and f. at least one RNA polymerase that can identify the promotor sequence; and 2) carrying out the constant temperature amplification reaction to the mixed reactants in a closed vessel, detecting the changes of fluorescence signals in a reaction system synchronously by a detector, and conducting the quantitative and qualitative detection to the nucleic acid sample according to the time and intensity of fluorescence signal changing. The method and the application have the advantages of low pollution, constant temperature in the reaction process, high detection sensitivity, fast detection speed, low requirements on equipment and instrument and low cost, and are applied to nucleic acid testing in fields such as clinical examination and blood screening.

The invention discloses a deep learning-based TFDS non-fault image detection method. The method comprises the steps of building a network model capable of synchronously detecting multiple regions and multiple types in combination with deep learning image classification and target detection technologies based on a deep learning theory; performing locating detection on regions of non-fault key parts in railway TFDS images by the model; judging the images, in which the regions of the non-fault key parts are not detected, as suspected fault images; and observing and detecting a small amount of the suspected fault images by human eyes of indoor train inspection personnel. According to the TFDS non-fault image detection method provided by the invention, a large amount of the non-fault images are filtered out and only a small amount of the suspected fault images are observed and judged by the human eyes by virtue of the deep learning technology; and the method can greatly reduce the workload and working intensity of the indoor train inspection personnel.

The invention discloses a data transmission method of a D2D system. The method comprises that synchronous detection is carried out on D2D UE; according to synchronous source information detected by the D2D UE, parameters of sequence and/or scrambling code initial value employed in subsequent D2D signal transmission are obtained, and D2D signals are sent correspondingly; and the D2D UE determines parameters of D2D signal sequence and/or D2D signal scrambling code initial value according to the synchronous source information detected by the D2D UE, and further detects D2D signals sent by other D2D UE. According to the method of the invention, interference of D2D transmission among D2D UE is randomized, the range of D2D UE of mutual discovery is ensured, and the detection complexity is reduced.

The invention relates to a method and a system for monitoring human physiological indexes by using visual information. The method includes the following steps: collecting the visual information of a to-be-monitored object through a collection device and saving datum; processing the selected visual information; analyzing processed results to extract the human physiological indexes; and returning the extracted human physiological indexes for display. The system comprises a module used for collecting the visual information, a module used for processing the collected visual information and a module used for analyzing processed signals to extract the human physiological indexes. According to the method and the system for monitoring the human physiological indexes by using the visual information, noninvasive and continuous monitoring of human physiological status and synchronous detection and collaborative analysis of the multiple physiological indexes are achieved, monitoring accuracy is high, wire layout is simple, and the method and the system for monitoring the human physiological indexes by using the visual information can be easily popularized as household medical care contents.

The invention discloses a signal channel training method based on a beacon frame, which includes: performing initial synchronous search for the beacon frame and computing initial estimation of frequency offset of a sampling clock after access terminal equipment is powered on; starting tracking estimation and compensation of frequency offset of the sampling clock based on initial estimation of frequency offset of the sampling clock; estimating in-band narrow-band interference and computing the coefficient of a notching filter according to the frequency point position of the in-band narrow-band interference; performing second power control processing for digital baseband signals processed by means of low-pass filtering and notching filtering; starting coarse carrier frequency offset estimation and compensation; starting fine carrier frequency offset estimation and compensation; starting signal channel frequency response estimation; and leading a receiver to enter a signal channel condition tracking state. The invention further discloses a signal channel training receiver device based on the beacon frame. The success probability of synchronous detection for the beacon frame can be increased, and signal channel estimation precision can also be improved.

Based on the measurement of the increase of sinusoidal voltage ΔV=V_maxsine(2πft) on adding a sinusoidal current ΔI=I_maxsine(2πft+φ) to the battery current, where f is the frequency and I_max, the amplitude of the superimposed current, with whose magnitudes the electrochemical impedance of the battery Z(f)=V_max/I_maxe^jφ is calculated, comprising the application of a first sinusoidal signal of prefixed frequency to the battery which generates an alternate voltage component superimposed over the direct one; eliminating the direct component of the response signal; applying a second periodic voltage signal with a frequency identical to that of said first signal and carrying out a synchronous detection of the alternate component generated by the application of said first signal to obtain the voltage proportional to the electrochemical impedance and evaluate the state of health and charge of the battery.

The invention discloses a gauge for three directional deformation of a ground fissure. The gauge comprises two vertical uprights which are respectively fixed at the left side and the right side of theground fissure, a horizontal tension displacement testing device which is fixed between the two vertical uprights, a vertical displacement testing device and a horizontal shear displacement testing device which are arranged on one of the vertical uprights, a data analysis system and an alarm unit controlled by the data analysis system; the vertical displacement testing device comprises a verticalslide block and a vertical line displacement sensor; the horizontal tension displacement testing device comprises a horizontal support slide shaft, a horizontal support bar, a horizontal slide blockand a horizontal line displacement sensor; the horizontal shear displacement testing device is an angular displacement sensor; and the horizontal line displacement sensor, the vertical line displacement sensor and the angular displacement sensor are connected with the data analysis system. The gauge has the advantages of convenient installation and debugging, convenient use and operation, high testing precision and good testing effect, and can synchronously detect absolute values of three directional deformations at the same point of the ground fissure.

An oscillation driver circuit that drives a physical quantity transducer includes a one-input/two-output comparator. The one-input/two-output comparator includes a shared differential section that compares a voltage signal input from a drive current/voltage conversion amplifier circuit with a given voltage, a first output section that receives a signal output from the differential section, variably adjusts a voltage amplitude of the received signal, and outputs the resulting signal, and a second output section that receives the signal output from the differential section, and outputs a synchronous detection reference signal of which the voltage amplitude is fixed.

A method of processing a DVD bitstream includes the steps of reading the DVD bitstream, the bitstream including a sync frame. A sync window is created, the sync window being open at least during the expected timing of a sync detection signal within the sync frame. The sync pattern is detected within the sync frame and the sync detection signal is generated only when the sync pattern has been detected and the sync window is open. A DVD sync pattern detection circuit includes a sync window generator to generate a sync window signal, a sync pattern detector, the sync pattern detector generating a sync detection signal only when both a sync pattern is detected in a DVD input stream and the sync window signal is asserted. A read channel bit counter generates a read counter signal to control the sync window generator, the read channel bit counter being reset when the sync pattern detector detects the sync pattern. The read channel bit counter controls the width of the sync window signals to allow the generation of correctly timed demodulation enable signals even when the sync frames have non-standard bit lengths. The sync windows also prevent the erroneous detection of sync patterns within the data portions of the sync frames. A pseudo sync detection signal is generated when the sync pattern is corrupted or missing from the sync frame.