373 results about "Frequency determination" patented technology

A frequency determination circuit generating a clock signal phase-locking with an external clock signal at a coarse precision and a fine adjust circuit generating an internal synchronizing signal phase-locking with the external clock signal at a fine precision are provided. The fine adjust circuit has a function of adjusting the phase of the frequency determination circuit when phase synchronization is to be carried out exceeding the adjust range thereof. The frequency determination circuit and the fine adjust circuit receive a clock power supply voltage. A clock reproduction circuit is provided which generates an internal clock signal phase-locking with an external clock signal or a reference clock signal stably even when the operating environment changes.

A wireless sensor reader is provided to interface with a wireless sensor. The wireless sensor reader transmits a narrowband, fixed frequency excitation pulse to cause the wireless sensor to generate a ring signal. The ring signal corresponds to the value of the physical parameter being sensed. The wireless sensor reader receives and amplifies the ring signal and sends the signal to a phase-locked loop. A voltage-controlled oscillator in the phase-locked loop locks onto the ring signal frequency and generates a count signal at a frequency related to the ring signal frequency. The voltage-controlled oscillator is placed into a hold mode where the control voltage is maintained constant to allow the count signal frequency to be determined. The low power, simple circuitry required to generate the excitation pulse allows the reader to be a small, battery operated unit. Alternative methods of frequency determination are also disclosed.

A core bit for abrasive cutting including a cylindrical tube (3) provided at its end surface with cutting or abrasive bodies (2) and a cover (4) provided at an opposite end surface of the cylindrical tube (3) and secured thereto and having, along its central axis (A), a shank (5) to be received in a rotary power tool, with the cover (4) being dimensioned, with respect to a set excitation frequency, for forming a whole number of maximum amplitude oscillations of a concentric flexural oscillation, and the cylindrical tube (3) being dimensioned, with respect to a set excitation frequency, for forming a whole number of maximum amplitude oscillations of axial longitudinal oscillations.

A system and method are disclosed for determining and applying a discount to a customer's transaction. The discount is of a progressive nature, wherein the value of a customer's discount increases if the customer meets the conditions associated with the discount. The system rewards more frequent or profitable customers with benefits such as larger increases in the discount or higher maximum discount than those awarded to less frequent or profitable customers. The discount is decreased or eliminated if the customer fails to meet the conditions associated with the discount.

The invention provides a hot file access method in a distributed file system. The method is characterized in that: A. a master determines a hot file through collecting and calculating an accessed frequency of each accessed data block in unit time in the distributed file system and records position information of the hot file; B. a first client requests to obtain the hot file from the master and the master sends the hot file position information to the first client; C. the first client selects a second client as a target client according to the received hot file position information, creates connection with the target client, reads the hot file from the target client and caches in the local; D. the master updates the hot file position information, adds and stores the position information of the first client of the hot file in the hot file position information.

Bandwidth expansion for audio signals by frequency band translations plus adaptive gains to create higher frequencies; use of a common channel for both stereo channels limits computational complexity. Adaptive cut-off frequency determination by power spectrum curve analysis, and bass expansion by both fundamental frequency illusion and equalization.

The invention discloses a method and device for controlling an outdoor fan in a split air-conditioner. The method includes the steps that the current outdoor environment temperature is detected; when the current outdoor environment temperature is larger than or equal to a preset outdoor environment temperature threshold value, the gear mode of the outdoor fan is determined according to the current outdoor environment temperature; when the current outdoor environment temperature is smaller than the preset outdoor environment temperature threshold value, the current outdoor condenser outlet pipe temperature is detected, and the current operation frequency of a compressor is acquired; the gear mode of the outdoor fan is determined according to the current outdoor environment temperature, the current outdoor condenser outlet pipe temperature and the current operation frequency of the compressor. According to the method, linkage control can be conducted according to the four parameters of the outdoor environment temperature, the condenser outlet pipe temperature, the revolving speed of the outdoor fan and the operation frequency of the compressor, the air-conditioner can operate efficiently, and therefore the low temperature refrigeration capacity is improved.

A system and method is provided that searches for the frequency and phase of a CDMA transmission in an iterative manner. With its automatic frequency control (AFC) disabled, the receiving system performs a coarse search for the transmitter's CDMA phase at a nominal receiving frequency. When the coarse phase is obtained, the AFC is invoked with a large-range pull-in, to obtain an initial, coarse frequency that is likely to be closer to the transmitter's frequency than the initial nominal frequency. At this coarse frequency, the receiving system repeats its search for the transmitter's CDMA phase, starting at the previously determined coarse phase. Because this second phase determination is conducted in the presence of less frequency error, it provides for a more accurate phase determination. The AFC is again invoked, but with a small-range pull-in, to obtain a finer frequency determination. Because the finer frequency determination is conducted in the presence of less phase error, a substantial improvement in the accuracy and precision of the frequency determination can be achieved. To achieve this more accurate phase and frequency determination within the same time duration as a conventional acquisition process, the initial coarse phase determination is conducted using a rapid, albeit less accurate, process than the conventional phase determination.

A multiplicity of synchronized inverters for driving a multiplicity of loads such as CCFLs that require high ac voltages are arranged in close proximity of the respective loads and controlled in phase. A frequency determination capacitor and a frequency determination resistor are connected to one of the inverters to generate a triangular wave signal and a clock signal. The triangular wave signal and clock signal thus generated are supplied to other inverters to synchronize all the loads so that they can be controlled in phase. The resistance of the frequency determination resistor is set to a substantially small magnitude at the time of startup to increase the frequency of the triangular wave signal, thereby enabling quick startup of the loads.

A frequency control apparatus and an information processing apparatus are disclosed wherein it is possible, in control of an operation frequency of a control object performed in response to a result of observation of an operation state of the control object, to limit the operation frequency or designate an allowable value or the like to achieve improvement in performance and power-saving. The frequency control apparatus (1) includes an observation section (3) for observing an operation state of a control object (2) which operates with a variably controlled frequency, a frequency determination section (4) for determining a clock frequency in response to the operation state, and a frequency limitation section (5) for limiting a range or a value of the clock frequency determined by the frequency determination section (4). If the frequency determined in response to the operation state of the control object (2) is within an allowable range, the control is performed with the frequency, but if the frequency is outside the allowable range, the frequency is limited to the range.

A system for assisting a user who is learning a language to prioritize words to be learned in order of usage frequency is disclosed. A frequency determination program running on a computer determines the frequency of usage of each word at a list of locations provided by the user. Different algorithms to identify what constitutes a word are employed depending upon the language of the source data. The total number of words at each location and their usage frequency found during the user session, along with a total number of words and their usage frequency for all user sessions performed regardless of location, are calculated and made available to the user. The user can view usage frequencies for words from a single location, a group of locations, or all user sessions performed.

Disclosed is a data sending method in a wireless communication system. The method includes: setting the sub-carrier interval of a communication system as (60*M) KHz, with M being an integer greater than 0 (101); and the communication system generating an OFDM symbol by way of inverse fast Fourier transform and sending the same, wherein the points of the inverse fast Fourier transform operation are determined according to the sub-carrier interval and the current sampling frequency (102). Also disclosed is a data sending device in a wireless communication system, which can be compatible and shared with the existing cellular network standards or standards to be used, thereby providing a solution suitable for the cellular mobile field and nomadic / local wireless data access with low costs, greatly reducing the development or usage costs of the manufacturers and operators of the cellular device, which not only saves resources but also can meet the data user demand developing with high speed and the future development demand of the wireless communication industry.

A measuring device that measures the level of fluid in a tank, for example a level of an aqueous urea solution in a tank for catalytic converters of combustion engines. The measuring means include: at least one sensor including a capacitive element electrically coupled to an oscillator configured to deliver a signal Si whose frequency FiPAD is a function of the capacitance of the capacitive element; at least one sensor being intended to be disposed outside of the tank, so that the capacitance of the capacitive element varies based on the level n of the fluid, when the level is comprised between a first threshold hi-min and a second threshold hi-max; a processing module, coupled to at least one sensor, and configured to determine the level n of fluid in the tank based on the frequency of the signal Si.

A mini base station connectable with the Internet including a frequency recognition unit to recognize a frequency band of an external signal transmitted from a cellular base station; and an operation frequency determination unit to determine an operation frequency band according to interference generated with the cellular base station based on the recognized frequency band of the external signal.

The invention provides a special network incident detection method based on a flow graph module. The method comprises the following steps that each data text is sequentially subjected to segmentation processing to obtain keywords in each data text as nodes, and the co-occurrence relation between the keywords is used as the an edge keyword co-occurrence graph; the edge frequency of each edge is determined according to the occurring times of each coming moment of each edge in the key graph co-occurrence graph when the current detection moment is reached and the corresponding attenuation corresponding to each coming moment of each edge; the node moving frequency of each node is determined according to the edge frequency of edges between all adjacent nodes; the moving frequency change degree of each node is determined, sudden hot word nodes are determined according to the moving frequency change degree, and a sudden hot word co-occurrence graph is obtained; the preset graph clustering algorithm processing is carried out according to the sudden hot word co-occurrence graph, and each incident is obtained. The sudden hot word detection is carried out on the basis of the flow graph keyword co-occurrence graph, further, the incidents are detected, and the accuracy and the real-time performance of the incident detection results are ensured.

The invention relates to a high-voltage cable frequency conversion series resonance voltage withstand debugging method. The method includes the following steps of: preparation work: a user should be familiar with the use of a frequency conversion series resonance voltage withstand device, data are all in readiness, the grounding of a system is excellent, high-voltage cable phase sequence calibration is carried out, and a high-voltage cable insulation test is carried out; the determination of the capacitance value of a tested cable; the selection of reactors: whether reactors are connected in a series-parallel combined manner is determined based on test voltage and a current value, and the capacity range of the tested cable is determined based on the inductance of the reactors and system work frequency; the selection of power source capacity: a power source and the current capacity of an exciting transformer are selected according to the calculated current value of the tested cable; and voltage withstand testing: a high-voltage cable insulation test is carried out, a test result is compared with a high-voltage cable insulation test result, and the difference value of the test result and the high-voltage cable insulation test result is in a set range. The method of the invention is fast and clear; the method is suitable for high-voltage cable frequency conversion series resonance voltage withstand debugging of various modes and is also suitable for resonance voltage withstand debugging of transformers, motors, and the like. With the method adopted, a resonance point can be found out fast.

A system and method are disclosed for determining and applying a discount to a customer's transaction. The discount is of a progressive nature, wherein the value of a customer's discount increases if the customer meets the conditions associated with the discount. The system rewards more frequent or profitable customers with benefits such as larger increases in the discount or higher maximum discount than those awarded to less frequent or profitable customers. The discount is decreased or eliminated if the customer fails to meet the conditions associated with the discount.

A digital television system, a memory controller, and a method for data access are provided. The digital television system comprises a memory and the memory controller. The memory controller writes a data packet to or reads a data packet from the memory. The memory controller comprises a register, a data packet adjuster, a burst length determination unit, and a frequency determination unit. The register sets a data bus width. The data packet adjuster adjusts the data packet according to the data bus width. The burst length determination unit determines a burst length according to the data bus width. The frequency determination unit determines an operating frequency of the memory controller according to the data bus width. The memory controller writes or reads the adjusted data packet in response to the burst length and the operating frequency.

A vehicle brake apparatus capable of preventing abnormal vibration due to thickness variations in a disc rotor includes a motor drive unit configured to control the motor which presses the brake pad against the disc rotor, a brake pressure detection unit for detecting a braking pressure for pressing the brake pad, and a wheel speed sensor for detecting a rotation speed of the disc rotor. If an amount of variation in the detection values detected by the brake pressure detection unit during one rotation of the disc rotor exceeds a variation amount determination threshold value and a detection value variation frequency has a correlation with the rotation speed of the disc rotor and the detection value variation frequency exceeds a variation frequency determination threshold value, the motor drive unit controls the motor in inverted phase to the variation in the detection values.

The present invention provides a servo motor controller with gain automatic regulation function, wherein the invention is provided with a interference plus section that adds interference in assigned frequency onto the velocity instruction values or the turning moment instruction values; a input / output characteristic estimate processing section that estimates input-output gain and lag in phase taking the interference as input value of control system, the velocity instruction values or the turning moment instruction values as value of exports of control system; a frequency identification section that performs analysis based on a frequency response method and identifies the frequency of a disturbance exhibiting a specified phase lag; an input / output gain identification section that identifies the input / output gain at the frequency identified by the frequency identification section; and a magnification factor resetting section that resets an adjustment magnification factor by performing a specified operation on a ratio between the identified input / output gain and a specified target value of the input / output gain.

The invention discloses a double-fed aerogenerator stator / rotor fault analysis diagnosis method. The method comprises the following steps: performing waveform matching on sampled six-path current signals by use of an improved HTT algorithm, and according to a matching result, carrying out adaptive end point extension; obtaining a limited number of intrinsic mode functions (IMFs) by performing empirical mode decomposition on the signals after the extension; eliminating obtained false IMFs by use of an energy conservation method; and according true IMFs obtained after the false IMFs are eliminated, determining a feature frequency of original signals, and through detecting the feature frequency, determining a fault type of a double-fed aerogenerator stator / rotor and severity. According to the invention, through the improved HTT algorithm, the adaptive capability of the algorithm is greatly improved, stator / rotor fault signals of a motor are effectively extracted, and convenience is provided for onsite detection of a double-fed aerogenerator stator / rotor fault.

A system and method for programming a digitally tunable oscillator is provided. A desired output frequency is received. A tuning effect of a set of digital tuning words on a crystal resonant frequency is determined, and valid parameters of an algorithm for translating and tuning the crystal resonant frequency to a value within an error tolerance of the desired frequency, based on the determined tuning effect are calculated. Valid parameters are preferably calculated based on an intermediate tuning value, sorted by ascending divide parameter of the algorithm, and then evaluated in sorted order for ability of a tuning effect to null frequency error to within the error tolerance. The valid set of calculated parameters are then programmed into a nonvolatile memory. The oscillator control parameters may remain unprogrammed until all necessary parameters are defined. Because the device may be programmed in a single step, without intermediate presumption of nominal crystal frequency, the final plate process may be unnecessary. A high accuracy may be obtained by searching through the complete set of available parameters for a set that meets a frequency and tolerance specification. The oscillator is preferably a Cypress CY2037 device alone or in combination with a Micro Analog Systems MAS1175 device.

A wireless sensor reader is provided to interface with a wireless sensor. The wireless sensor reader transmits a narrowband, fixed frequency excitation pulse to cause the wireless sensor to generate a ring signal. The ring signal corresponds to the value of the physical parameter being sensed. The wireless sensor reader receives and amplifies the ring signal and sends the signal to a phase-locked loop. A voltage- controlled oscillator in the phase-locked loop locks onto the ring signal frequency and generates a count signal at a frequency related to the ring signal frequency. The voltage-controlled oscillator is placed into a hold mode where the control voltage is maintained constant to allow the count signal frequency to be determined. The low power, simple circuitry required to generate the excitation pulse allows the reader to be a small, battery operated unit. Alternative methods of frequency determination are also disclosed.

A data reproduction device is provided that can achieve seamless reproduction of a stream even at the switching positions of the validity of the bandwidth extension function even in the case where the validity of the bandwidth extension function is switched in the stream. A data reproduction device (2000) includes: an input frequency obtainment unit (2001) which analyzes header information Hdr and obtains an input frequency FSin which is the frequency of basic data; an output frequency determination unit (2002) which performs predetermined processing based on the input frequency FSin and determines an output frequency FSout which is the sampling frequency of a decoded frame Fdata; and a decoding unit (2003) which, if the SBR function is valid in a frame to be decoded, decodes sample data at the input frequency FSin and extends the bandwidth of the sampling frequency up to the output frequency FSout through the SBR processing on the decoding result, while if the SBR function is not valid in the frame, upsamples the decoding result obtained at the input frequency FSin to the output frequency FSout.

The invention discloses a method and apparatus for detecting voice fundamental tone frequency. The method for detecting voice fundamental tone frequency comprises detecting monotone components in a voice signal frame; determining a candidate fundamental frequency by means of the frequencies of M monotone components with maximum frequency spectrum amplitudes; placing the candidate fundamental frequency in a candidate fundamental frequency set; calculating the harmonious criterion of each candidate fundamental frequency in the candidate fundamental frequency set; and using the candidate fundamental frequency with the maximum harmonious criterion as the fundamental frequency of the voice signal frame. The monotone component with large energy is used as the basis of fundamental tone detection such that the accuracy of fundamental tone detection in noise environment is increased.

Infrared crosspoint system. An infrared (IR) command code is received at the source location, and processed to produce a packet of information representing the IR command code. This packet can be incorporated into a communication frame such as an Ethernet frame and forwarded over a network. The frame is parsed at the destination location and the IR command code can be reassembled based on information in the packet. In some embodiments, apparatus including a frequency determination buffer, an IR transmitter and receiver and a processing platform is used to implement the invention. The techniques disclosed herein can also be implemented as part of a general purpose, premises automation system, consisting of distributed processing platforms.