91results about How to "Accurate time delay" patented technology

In correspondence with the left and right external ears of a listener occupying a seat, a three dimensional sound field reproducing unit includes at least more than two speakers disposed on a headrest on the top of a backrest of the seat, and three dimensional signal processing means which converts an output signal from a sound source into a three dimensional sound field signal for supplying it to each of the speakers. Three dimensional sound field with high accuracy and fidelity is reproduced near the external ears of the listener.

An apparatus for generating a bandwidth extended audio signal from an input signal, includes a patch generator for generating one or more patch signals from the input signal, wherein the patch generator is configured for performing a time stretching of subband signals from an analysis filterbank, and wherein the patch generator further includes a phase adjuster for adjusting phases of the subband signals using a filterbank-channel dependent phase correction.

The invention discloses a video time delay detection method. The method comprises following steps of obtaining current first real time information of a local end image collection device and a first image displayed by a local end video display device at the same time, wherein the first image is the image containing the second real time information corresponding to the first image collected by the local end image collection device; and determining time delay information according to the first real time information and second real time information. The invention also discloses a video time delay detection device.

The invention discloses a power-on resetting circuit which comprises a power-on circuit, a level triggering circuit and a discharging circuit, wherein the power-on circuit comprises a current mirror, a first capacitor and a second capacitor; when power-on voltage is supplied to the power-on resetting circuit, the current mirror respectively charges the first capacitor and the second capacitor; the level triggering circuit is connected to a voltage reference node of a power-on circuit and is used for detecting the voltage of the voltage reference node and outputting a power-on resetting signal when the voltage of the voltage reference node is greater than a triggering value; and the discharging circuit is connected between the power-on circuit and the level triggering circuit and is used for discharging the first capacitor and the second capacitor after the power-on voltage disappears. By the power-on resetting circuit, when power voltage is powered on for many times, the power-on resetting signal can still be correctly generated; and after the resetting signal is generated, a static working current dose not exist, so that the power consumption is reduced.

The invention discloses a method for accurately measuring wide-area power grid PMU (Phasor Measurement Unit) data time delay, and relates to the field of real-time dynamic monitoring of electric power systems. At present, the wide-area power grid PMU data time delay cannot be accurately measured. The method includes the following steps of: arranging a simulated front-end system at a WAMS master station terminal; transmitting-receiving mirror images by a port on the PMU data communication side of an interchanger between the PMU and the simulated front-end system or between the PMU and the WAMS interchanger to an idle port; access the mirror image port into a collection internet access of a network recorder which records moment of data passing through the interchanger; analyzing to obtain the time information of a required data interaction process according to the original communication data collected by the network recorder; calculating the wide-area power grid PMU data time delay according to the time information of the data interaction process. The technical scheme does not influence the existing data interaction of WAMS and PMU, and can obtain the accurate PMU data time delay.

The invention discloses an optical coherent receiver time delay and phase difference test method which comprises the following steps: generating beat frequency through inputting scanning signals, of which the frequency is similar to that of local oscillator signals, to an optical coherent receiver to be tested; collecting beat frequency information output by each radio frequency of the optical coherent receiver to be tested by utilizing an oscilloscope; carrying out noise elimination through the FFT operation and calculating the phase and frequency of the beat frequency; and finally, carrying out linear fitting to obtain relation curve of the phase and frequency, and calculating the time delay and phase difference between channels of the optical coherent receiver to be tested according to the curve. The invention also discloses a test system for the method. The test system comprises a local oscillator signal source, a tunable scanning signal source, the optical coherent receiver to be tested, the oscilloscope and a data processing unit. The beat frequency method is utilized to test the time delay and phase difference between the channels of the optical coherent receiver to be tested, so that simple and practicable effects are achieved, time delay and phase difference between the channels can be accurately measured, the difficulty that a conventional instrument cannot directly measure the phase difference and time delay between 25 GHz high-speed signal channels is overcome, and the repeatability of test data is good.

Described are systems and methods that provide tunable true time delay of a signal using a compact photonic circuit. The photonic circuit comprises a plurality of waveguides, in which each waveguide corresponds to a different time delay. A particular one of the waveguides corresponding to a desired time delay is selected by tuning the wavelength of a tunable laser. Additional photonic circuits can be used to provide additional selectable time delays.

The invention relates to a mobile unloading migration algorithm based on an improved HRRN (High Resolution Response Next) algorithm and a multi-attribute decision. The method comprises the following steps: step 1, a single wireless body area network generates a plurality of tasks with different priorities at a certain moment, if the tasks can be locally processed, the tasks are directly locally processed, otherwise, the tasks are uploaded to an edge server; 2, establishing a benefit function of an edge server, and taking the edge server with a high benefit value as an initial edge server of the current task; 3, judging whether the current edge server is suitable or not; 4, judging whether the edge server meets two criteria or not, wherein one of the criteria can be used as a candidate edgeserver; and step 5, according to the benefit function of the edge server established in the step 2, calculating the benefit values of all candidate edge servers, and selecting the edge server with the highest benefit value to migrate.

The invention provides a delay parameter computation method for a multi-channel scanning, which unifies delay computational formulas of three probes such as a linear array, a convex array and a phased array, and the formulas are applicable to non-deflection scanning and deflection scanning; and scanning lines with different densities can be calculated only by changing location variables of the scanning lines. In the invention, only an array element position, a scanning starting point position and relative focus parameters need to be stored, thus having small quantity of stored data; real-timecomputation can realize accurate delay without a large quantity of the stored data; delay in various situations for the probes, the density and deflection is calculated using a unified circuit to greatly simplify a circuit structure; and delay of each scanning line is independently controlled to conveniently realize arbitrary density scanning, for if no integral multiple relationship exists between spacing among the scanning lines and spacing among array elements of the probes, different scanning lines have different delay data. In the invention, the scanning lines are independently controlled, thus achieving arbitrary density scanning.

The invention provides a power-on sequence control circuit, a power-on sequence control method, a control device and an electronic terminal. The circuit comprises a trigger unit comprising a first trigger and a second trigger. Two input ends of each trigger are each connected with a time delay circuit, so that the time delay of an output power source control signal is the sum of the time delay of two input end signals. Power source drive signals are output through the output signals of the two triggers to drive power source units. The time delay differences between the power source drive signals form power-on sequences of the power source units, and accurate power-on time delay control and safe power-on sequences are realized.

The invention discloses a method and a device of delay control for ultrasonic imaging. The method includes steps of calculating an initial delay error generated if an ultrasonic wave in each channel arrives at an initial focus point of a corresponding scanning line in advance and calculating a relative value of a delay error between each focus point and a previous adjacent focus point on the same scanning line corresponding to each channel; accumulating to obtain the delay error of the focus point corresponding to each channel according to the initial delay errors calculated in advance and the relative delay errors calculated in advance of all focus points; adding each delay error and delay which is calculated according to sound velocity of a scanned object together to obtain real delay of the corresponding focus point corresponding to the corresponding channel; or respectively calculating delays in a probe matching layer and the scanned object, adding the delays together to obtain real delay, and then performing delay control to transmission and receiving of the ultrasonic wave by the aid of the real delay. Phase correction is realized by the delay control, delay of the ultrasonic wave of different channels arriving at the same focus point is more accurate, and imaging quality of an ultrasonic system is improved.

An ultrasonic imaging apparatus configured to generate synthetic focus ultrasonic images in real-time in a first operation mode, and which is configured to pulse multiple transducers with accurate time delays between each pulse to form images using conventional sum beam-forming and/or focus-and-steer techniques in a second mode, providing a “dual-use” system capable of forming both synthetic focus images and beam-formed images using the same transducer array.

The invention discloses a method and a device for controlling the turn-on of a light supplemental lamp. The method comprises the following steps: sending a light supplemental control signal to the light supplemental lamp, wherein, the light supplemental control signal is used for controlling the turn-on of the light supplemental lamp and the duration of the continuous light supplemental of the light supplemental lamp; receiving a feedback signal sent by a feedback device, and determining a time delay of turning on the light compensation lamp based on the feedback signal and the light compensation control signal; based on the time delay of turning on the light supplemental lamp, adjusting the transmission time of the light supplemental control signal and the time length of continuous lightsupplemental of the light supplemental lamp, so that the light supplemental lamp can perform light supplementing when the image is exposed. The invention solves the technical problem that the image quality is not high due to the incomplete exposure of the image in the prior art.

The invention relates to a software phase locked loop improving method. The software phase locked loop improving method is characterized by comprising the following steps that sampling is carried out on power grid voltage, and voltage components ualpha and ubeta under a two-phase coordinate system are obtained through Clarke conversion; accurate delayed signals ualpha-D and ubeta-D of the voltage components ualpha and ubeta are calculated through a weighted average method; power grid voltage positive-sequence components u and u are extracted according to a delayed signal cancellation principle; rotation axis conversion is carried out on the power grid voltage positive-sequence components u and u so as to obtain u (n) and u (n), wherein n represents the current nth control period; the frequency of the power grid voltage is calculated; digital integration is carried out on the frequency of the power grid voltage so as to obtain a power grid voltage phase angle used for calculation of rotation axis conversion, and closed loop feedback is formed. The weighted average method of two sets of delayed signals is adopted to approach the expected delayed signals, and therefore signal delaying is more accurate, direct current offset and fluctuation in the phase locked angle and amplitude are effectively restrained, accuracy of power grid fundamental wave voltage phase locking is improved, and the method can be widely applied on the occasions high in requirement for the PLL response speed.

The invention discloses a detonator system. The system comprises an array and a plurality of detonators, wherein the array is formed by connecting a plurality of time delay relays which are in series connection with each other; and the plurality of detonators are connected to the array according to a predetermined interval respectively. The invention also discloses another detonator system. The system comprises a plurality of detonators and a plurality of connecting parts which comprise time delay relays, wherein the detonators are connected with the connecting parts by adopting lead wires; and a first connecting part connected with a first detonator is connected to a lead wire between an adjacent second detonator and a corresponding second connecting part. The invention also provides corresponding time delay relays. By using the system, a precise time delay length between any two detonators can be determined, and the continuity and the effectiveness of the conversion of energy and signal from one end of a time delay line to the other end are ensured.

The invention discloses a novel compact, efficient and fast on-chip network router based on network coding. The router comprises P ways of input and output channels, wherein each input channel is provided with v virtual channels; each input channel is provided with one routing logic and a virtual channel allocator which are respectively responsible for a routing direction of data transmission and allocation of the virtual channels; the virtual channel allocator is also connected to a switch allocator; the switch allocator is responsible for allocating crossbars to the P ways of input channels, so that arbitration of one output channel is simultaneously requested by multiple input channels; network coding modules NCU are also arranged between the P ways of input channels and the cross switches; the output of flits of the virtual channel passes through a simple coding selection circuit, the NCU carries out coding operations on the input which conforms to the conditions, after the coded flits are arbitrated by the switch allocator, the flits are sent to the crossbars. The on-chip network router supports a transmission mode with the flits as a unit, the real-time coding is realized and the additional hardware and power consumption can be effectively reduced.

The invention discloses a computing method for accurate time delay based on a long term evolution (LTE) locating and reference signal characteristic. Firstly, a corresponding correlation chart between a time difference and a phase difference from a source node to two anchor nodes respectively is built, then an integral value of a receiving signal between the source node and each pair of anchor nodes is calculated, and finally the calculated integral value of each receiving signal between the source node and each pair of anchor nodes serves as the phase difference. In the corresponding correlation chart between the time difference and the phase difference, the time difference is inquired and obtained. Through utilization of the LTE locating and reference signal characteristic, corresponding correlations between the time difference and the phase difference from the source node to an aim node are built. On the basic of constructing the corresponding correlation chart between the time difference and the phase difference, and through product and integral operation on the receiving signals in a time domain, the accurate time delay can be obtained through looking up on the chart according to a computing result.

A method and apparatus for generating short electronic pulses using a modified differential trigger that is partly an analogue sinusoidal voltage and partly a selectable, DC voltage. The differential trigger is applied to a differential base band pulse generator having a NAND gate and AND gate. The trigger is applied to both NAND inputs and to one AND input. The NAND output is applied the other AND input. Such a circuit is an OFF state for all input states. However, as the input switches state, the NAND gate delay causes the AND gate to be ON briefly, generating a short pulse. The timing of this pulse can be controlled by varying the constant DC voltage. By using fast switching SiGe CML gates, short pulses with a controllable time off-set can be generated that are suitable for use in automotive radar applications, using only sub-GHz clocks.

The embodiment of the invention provides a cache length adjusting method and device, electronic equipment and a storage medium. The method comprises the steps of acquiring delay jitter according to the arrival time of each voice packet in a previous period, wherein the delay jitter comprises a plurality of delays; determining a suggested cache length according to the maximum time delay in the timedelay jitter; and adjusting the length of the cache in the current period according to the suggested cache length. According to the method, the accurate time delay is obtained through the arrival time of the voice packet in the previous period, and the suggested cache length can be accurately calculated, so that the cache length of the current period is adaptively adjusted, the time delay jitteris eliminated, and the voice quality is improved.