52results about How to "Improve time synchronization" patented technology

A high-time-synchronization multichannel fiber bragg grating sensing system comprises a broadband fluorescent light source, a three-terminal circulator, an optical divider, a 1*4 optical switch group, a fiber bragg grating sensor group, a sensing signal demodulating device and a computer. On the basis of the advantages of high wavelength resolution precision, high demodulating speed and the like of an existing multichannel fiber bragg grating sensing system, high time synchronization in signal acquisition and processing of each channel can be realized in multichannel multi-point sensing measurement, and moreover, the high-time-synchronization multichannel fiber bragg grating sensing system is high in reliability.

A synchronization method, a control system and a slave unit for the time synchronization of at least two slave units, in which the slave units and the master unit are connected by two signal lines. A signal transmitted by the master unit returns to the master unit after passing through all the slave units. Two independent counters are provided in each slave unit, these counters being activated by reception of a reference signal transmitted by the master unit. The first time counter counts the time since the receipt of the reference signal via the first signal line and the second time counter counts the time since the receipt of the reference signal via the second signal line. The counter contents are read out as soon as the sum of the counter contents reaches a signal throughput time transmitted previously by the master unit.

The invention belongs to the field of power systems and relates to an intelligent power grid distribution and autonomous wide-area timing method. The method of the invention comprises: constructing an intelligent power grid wide-area time synchronization system, wherein each of the plant stations and scheduling centers in the system represents a time node, and each time node has an independent satellite synchronous clock responsible for keeping the time synchronization of all sets of power equipment in the node and releases time synchronization information to other time nodes in the wide-area time synchronization system through a time communication network; and keeping the time synchronization of the time nodes by the time information of the satellite synchronous clocks when the satellite synchronous clocks work normally, and correcting the time information of a local crystal oscillator color by the time synchronization information released by other time nodes in the wide-area time synchronization system to keep the time synchronization of the node when the satellite synchronous color of a certain time node fails to work. The method of the invention provides a new through for the time synchronization of a power grid and can improve the time synchronization performance of the intelligent power grid effectively.

Present invention relates to a time frequently synchronizing method for receiving data short distance wireless networks, belonging to wireless communication technology field. It contains receiving RF transmitted signal, frequency conversion and sampling to become baseband receiving signal, utilizing training sequence periodicity to estimate code element cycle reciprocal decimals times frequency offset, according to real system frequency deviation region to determine the value taking possibility for code element cycle reciprocal integral multiple frequency offset, according to each hypotheses possible frequency offset to proceed frequency offset compensation to receiving signal, then to proceed sliding correlation with local sequence, according to correlative maximum value to determine frequency offset estimated value and time synchronizing position, thereby realizing time frequently combined synchronizing position. Said method reduces calculated amount in time and frequency synchronism, to make receiver having more low power consumption.

The invention discloses a Bluetooth headset with a voice encryption function and a voice encryption method of the Bluetooth headset. The Bluetooth headset comprises a Bluetooth control circuit, a synchronizing signal encoder, a synchronizing signal decoder, a voice encryption circuit and a key management circuit, wherein the synchronizing signal encoder, the synchronizing signal decoder, the voice encryption circuit and the key management circuit are connected with the Bluetooth control circuit. The voice encryption method of the Bluetooth headset comprises processes of simulation language encryption, synchronous encryption and dynamic encryption. The Bluetooth headset with the voice encryption function and the voice encryption method of the Bluetooth headset have the characteristics of high confidentiality, high synchronicity, good convenience in use, wide application range and low cost.

A computer vision based land surface settlement monitoring method comprises the following steps of A) instrument arranging, B) equipment debugging, C) parameter setting and D) monitoring and result storing. Before start of monitoring, a first frame of image is captured, an LED lamp is marked and serves as a tracking template, the pixel center of a template area serves as a reference point for calculating settlement of the point, and a monitoring area of the point is marked according to the pre-estimated settlement; after start of monitoring, a monitoring area of a second frame of image is searched for optimal match of the LED lamp template, a pixel displacement difference is calculated from the pixel center position of the first frame of template area and the pixel center position of the template area obtained by matching in the present frame, and the second frame of image is updated as a new reference point; the pixel displacement difference of the LED lamp template between two adjacent frames of images are calculated repeatedly in the above way; and pixel displacement of the LED lamp is calculated by accumulation of the pixel displacement differences, and a practical settlement process of the LED lamp is calculated by proportional relation between the practical size and the pixel size.

A synchronization method, a control system and a slave unit for the time synchronization of at least two slave units, in which the slave units and the master unit are connected by two signal lines. A signal transmitted by the master unit returns to the master unit after passing through all the slave units. Two independent counters are provided in each slave unit, these counters being activated by reception of a reference signal transmitted by the master unit. The first time counter counts the time since the receipt of the reference signal via the first signal line and the second time counter counts the time since the receipt of the reference signal via the second signal line. The counter contents are read out as soon as the sum of the counter contents reaches a signal throughput time transmitted previously by the master unit.

Apparatus, and an associated method, for a radio communication system having a sending station and a receiving station. The sending station sends data pursuant to a communication service and ultrawide band signals pursuant to a selected time-hopping sequence. An ultrawide band signal detector is positioned at the receiving station. The ultrawide band signal detects the ultrawide band signal transmitted thereto. Correlation is made between the detected ultrawide band signal and a locally-generated replica signal. Correlations therebetween are used to facilitate various receiving station operations, such as equalization operations upon received data, time synchronization of the receiving station to the sending station, and position determination of the positioning of the receiving station.

The embodiment of the invention discloses a data determination method and device and a vehicle-mounted terminal. Wherein the main controller is respectively connected with the at least two image acquisition devices, each image acquisition device is connected with the corresponding processor, and the main controller is connected with each processor. The method comprises the following steps: a maincontroller acquires an image acquired by each image acquisition device in response to a first image acquisition instruction, acquires a timestamp of the image sent by each processor, and associates the image with the timestamp according to a preset corresponding relationship between the image acquisition devices and the processors; wherein the first image acquisition instruction is used for indicating each image acquisition device to acquire an image at an associated moment; wherein the timestamp is determined when the processor determines that the image acquisition device acquires the image.By applying the technical scheme of the embodiment of the invention, the time synchronism among the images acquired by different cameras can be improved.

Disclosed are systems and methods for improving image recognition by using information from sensor data. In one embodiment, the method comprises receiving one or more sensor records, the sensor records representing timestamped sensor data collected by a sensor recording device; selecting an event based on the sensor records; identifying a time associated with the event; retrieving a plurality of timestamped video frames; synchronizing the sensor records and the video frames, wherein synchronizing the sensor records and the video frames comprises synchronizing the timestamped sensor data with individual frames of the timestamped video frames according to a common timeframe; and selecting a subset of video frames from the plurality of timestamped video frames based on the selected event.

A method and apparatus for delivering interactive television (ITV) data by using the same TV scan line that also carries closed caption data. The ITV data is inserted into the scan line with CC data by detecting a gap associated with a first CC data unit. If the gap is large enough to contain all of the group of ITV data units then electronically insert the entire group of ITV data units into the gap. If the gap is not large enough to contain the entire group of ITV data units, insert a subset of the entire group of the ITV data units into the gap and continue to the gaps associated with successive CC data units, inserting subsets of the ITV data into subsequent gaps until the entire ITV message has been inserted into the gaps between CC data units.

The invention belongs to the technical field of 3D measurement, and provides a 3D information measuring device, including: an image acquisition device, which is used to collect a group of images of a target object through the relative movement between the collection area of ​​the image collection device and the target object; The acquisition area of ​​the driving image acquisition device and the target object generate relative motion; the acquisition area moving device adopts one of the following two schemes: ① the acquisition area movement device is a rotating shaft device, so that the image acquisition device rotates along a central axis; ② The acquisition area moving device is an optical scanning device, so that when the image acquisition device does not move or rotate, the acquisition area of ​​the image acquisition device and the target will move relative to each other. The invention adopts a monocular camera and a collection area mobile device with a more streamlined structure and a smaller footprint. The rapid transformation of the relative position of the acquisition area and the target object is realized, the image acquisition efficiency is accelerated, and the interference caused by the moving camera is reduced.

The invention belongs to the technical field of communication, and particularly relates to a method for synchronously capturing a short-wave multi-carrier signal with a leader sequence. The method comprises the following steps of: performing power spectrum analysis on a signal in a time domain and a frequency domain simultaneously in a sliding window manner by utilizing leading audio frequency information in the signal, and covering frequency offset of a plurality of positive and negative subcarrier intervals on the frequency domain by a time-frequency sliding window which comprises a plurality of multi-carrier symbols on the time domain, taking the leading sound average signal-to-noise ratio of a plurality of symbols in the time-frequency sliding window as a capture judgment standard; if the average signal-to-noise ratio of the leading sound in the current sliding window length is greater than the capture threshold and the number of symbols with high signal-to-noise ratios is greater than a certain value, it is considered that the capture is successful; meanwhile, the time domain position and the frequency domain position corresponding to the current sliding window are respectively the calculation basis of the initial time offset estimation value and the initial frequency offset estimation value; according to the method, the characteristics of the leading sound signals are fully utilized, multi-symbol time-frequency analysis is combined, normal synchronous capture can still be performed under large frequency offset, and the robustness of synchronous capture is improved.