364 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.

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 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.

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 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.

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.

A system and method for discrimination and identification of a target including: receiving a radar return signal including target information and clutter information; determining a two-fold forward or forward-backward data matrix from the received signal, using a multi-dimensional folding (MDF) process; computing singular values of the two-fold forward or forward-backward data matrix; using the computed singular values to determine a noise power level of the radar return signal; determining the number of scatterers in the radar return signal according to a predetermined threshold value above the noise power; estimating complex Doppler and azimuth frequencies of each scatterer from the determined number of scatterers using the MDF process; determining dispersive scatterers and non-dispersive scatterers using the estimated Doppler and azimuth complex frequencies of each scatterer; and distinguishing the target information from the clutter information, according to the determined dispersive scatterers and non-dispersive scatterers,