46 results about "Absolute frequency" patented technology

The present disclosure relates to a system and method for visualization of music and other sounds. In one embodiment, the twelve notes of an octave are labeled around a circle. When notes are played, the intervals between the notes are visualized by displaying a line between the labels corresponding to the note labels on the circle. In some embodiments, the lines representing the intervals are color coded with a different color for each of the six intervals. In other embodiments, the music and other sounds are visualized upon a helix that allows an indication of absolute frequency to be displayed for each note or sound.

Disclosed is a system and method for stabilizing the carrier-envelope phase of the pulses emitted by a femtosecond mode-locked laser by using the powerful tools of frequency-domain laser stabilization. Control of the pulse-to-pulse carrier-envelope phases was confirmed using temporal cross correlation. This phase stabilization locks the absolute frequencies emitted by the laser, which is used to perform absolute optical frequency measurements that were directly referenced to a stable microwave clock.

An estimated frequency-wavenumber spectrum is generated by applying a first Anti-leakage Fourier transform method to aliased frequency components in temporal-transformed seismic data and applying a second Anti-leakage Fourier transform method to unaliased frequency components in the temporal-transformed seismic data. The second Anti-leakage Fourier transform method applies an absolute frequency-wavenumber spectrum extrapolated from unaliased frequencies to aliased frequencies to weight frequency-wavenumber components of the aliased frequencies. An inverse temporal and spatial Fourier transform is applied to the estimated frequency-wavenumber spectrum, generating trace interpolation of the seismic data.

The present disclosure relates to a system and method for visualization of music and other sounds. In one embodiment, the twelve notes of an octave are labeled around a circle. When notes are played, the intervals between the notes are visualized by displaying a line between the labels corresponding to the note labels on the circle. In some embodiments, the lines representing the intervals are color coded with a different color for each of the six intervals. In other embodiments, the music and other sounds are visualized upon a helix that allows an indication of absolute frequency to be displayed for each note or sound.

An estimated frequency-wavenumber spectrum is generated by applying a first Anti-leakage Fourier transform method to unaliased frequency components in temporal-transformed seismic data and applying a second Anti-leakage Fourier transform method to aliased frequency components in the temporal-transformed seismic data. The second Anti-leakage Fourier transform method applies an absolute frequency-wavenumber spectrum extrapolated from unaliased frequencies to aliased frequencies to weight frequency-wavenumber components of the aliased frequencies. An inverse temporal and spatial Fourier transform is applied to the estimated frequency-wavenumber spectrum, generating trace interpolation of the seismic data.

The invention discloses a method for sending a synchronous signal sequence. The method comprises the following steps: for each ordinary frequency point in a synchronous frame, generating a primary synchronous signal sequence and a secondary synchronous signal sequence occupying the ordinary frequency point according to an absolute frequency point index number and a cell identifier of the ordinary frequency point; mapping the primary synchronous signal sequence onto a primary synchronous time-frequency resource corresponding to the ordinary frequency point in the synchronous frame; mapping the secondary synchronous signal sequence onto a secondary synchronous time-frequency resource corresponding to the ordinary frequency point in the synchronous frame; and for each ordinary frequency point, generating a time domain continuous signal of the ordinary frequency point transmitted by corresponding OFDM symbols in the synchronous frame on a single antenna port by means of sequence symbols mapped onto the synchronous time-frequency resources, and carrying out corresponding transmission. The method disclosed by the invention can be used for effectively avoiding the problem of a high peak-to-average ratio due to superposition of synchronous signals, and is suitable for private network wireless communication systems with carrier aggregation characteristics.

The invention discloses a method for achieving laser frequency-offset-lock through an F-P interferometer. According to the method, a main laser locked through a traditional absolute frequency stabilizing method is used as a reference, the peak time difference between emergent signals of lasers of the main laser and lasers of an auxiliary laser for jointly transmitting an F-P cavity is used as frequency error signals, and then frequency-offset-lock of the main laser and the auxiliary laser is achieved. The large-range frequency-offset-lock can be achieved without a radio frequency device, and the F-P interferometer has the advantages of being simple in structure, high in stability and the like.

The invention discloses a frequency-multiplier klystron and a manufacture method thereof, relating to the technique of electron tubes. A microwave actuating signal with the frequency of f is used as an input signal; electron beams are in manual action with multiple resonant cavities of the conventional klystron in vacuum; ultraharmonics components in the Fourier spectrum of the electron beams are obviously increased after good cybotaxis is achieved; an output structure adopts the output structure of a wave band where frequency nf is positioned or utilizes the higher order mode of the conventional structure; the ultraharmonics components of the frequency nf, namely, the input frequency f and the output frequency nf, are derived from the electron beams in high cybotaxis so that the microwave small signal is amplified and the frequency is multiplied to nf from f strictly in integer multiples. The method of the invention is simple and easy to implement, and the manufactured frequency-multiplier klystron can keep comparative frequency multiplication grain, good spectrum purity, wider absolute frequency multiplication bandwidth and higher power capability.

The invention relates to a measurement device for the frequency of a double-frequency He-Ne laser device and a measurement method of the measurement device. The measurement device comprises a stable-frequency laser system and a double-frequency laser frequency measurement system, which are connected with each other, wherein the stable-frequency laser system can lock an output laser frequency of a tunable laser device to any comb tooth of an optical-frequency comb, so that an output laser frequency of the tunable laser device can be traced to a rubidium clock frequency standard; the double-frequency laser frequency measurement system beats frequencies of an output laser of the locked tunable laser device and the output laser of a double-frequency He-Ne laser device to be detected; and two cross-polarization laser frequencies can be simultaneously measured. According to the measurement device and the measurement method disclosed by the invention, absolute frequencies of the two cross-polarization lasers of a double-frequency He-Ne laser can be simultaneously measured and the measured result can be traced to the rubidium clock frequency standard, and the anti-interference capability of the measurement system is strong, so that the measurement device and the measurement method are suitable for the frequency measurement and calibration of the double-frequency He-Ne laser device in an industrial environment.

The invention discloses a method for determining a user equipment downlink MCS. The method includes the steps that the initial MCS grades of all user equipment are set through a base station; the frequency deviation values of uplink data of the user equipment are measured through the base station, and users similar in absolute frequency value are classified into a big group; the user equipment in all the big groups is further classified into different small groups according to service types; for all the user equipment in the same small group, the ratio k of ACK feedbacks of all downlink services, which are received by F sub-frames, to all feedbacks is calculated; according to the relation between k and a preset threshold value, the MCS grades are adjusted. Compared with the prior art, signaling overheads can be reduced, and meanwhile the MCS grades of the user equipment can be adjusted in time.

The invention provides a method and a device for recognizing problem types and a method and a device for establishing recognition models. During a process of establishing a question recognition model, whether a text fragment belongs to feature fragments of a class is judged on the basis of the absolute frequency of occurrence and the relative frequency of occurrence compared with other classes of the text fragment containing interrogatives or requirement words in the class, and accordingly the type to which the text fragment containing the interrogatives or the requirement words belongs can be positioned accurately, and the accuracy of recognition of question types can be improved. In addition, the question type recognition model can further be used for reclassifying training corpuses to serve as updated training corpuses, and the question type recognition model can be optimized gradually through this kind of iteration mode. If question type recognition and searching are performed on the basis of the mode, the searching accuracy can be further improved.

The invention provides a user equipment network redirecting method and system. The method comprises the following steps that when user equipment does not support frequency point information carried in redirecting information, whether the absolute frequency range of a frequency band corresponding to frequency point information supported by the user equipment overlaps with that of the frequency band corresponding to the carried frequency point information is judged; if yes, the carried frequency point information is converted into frequency point information supported by the user equipment so that the user equipment performs network redirecting according to the converted frequency point information. User perception and the KPI (Key Performance Indicator) can be improved.

A method for testing the absolute time delay of a satellite transponder. First, an angle-modulated microwave signal source is used to output an angle-modulated microwave signal, and then the angle-modulated microwave signal is divided into two paths. One path is input to the entrance of the satellite transponder through an attenuator, and the other path The signal is used as the input of an A / D converter, and the output signal of the satellite transponder is input to another A / D converter after passing through a high-power attenuator. The two A / D converters use the same reference clock to sample data synchronously, and then demodulate the angle modulation signal on the two-way A / D sampled data to obtain the baseband signal of the two-way A / D sampling signal. The two baseband low-frequency periodic signals are compared to obtain the absolute time delay between the two baseband signals represented by the difference in the serial numbers of the sampling points. The number of sampling points multiplied by the sampling period is the absolute Delay, after deducting the delay calibration value of the attenuator and the connecting cable, it is the absolute delay of the satellite transponder.

The invention is concerned with oil pump high effect and energy saving control tank belonging to electron control technology field. It is fit for oil pump with absolute frequency modulation, press modulation, frequency and pressure control function, owning high capability frequency conversion technology taking 380V / 660V / 1140V three-phase AC pressure. The product relates to main circuit, driving, control, data collecting, feedback, display and electrical source, and the main circuit owns rectifier and inverter, drive exports high effect type SPWM wave to drive IGBT, data collecting collects three-phase current, three-phase voltage, DC, voltage of DC, feedback answers electricity to power network, display uses liquid crystal to display data, the electrical source offers the needed work electrical source. This control tank owns active energy count, over-current protection, over-voltage protection, feedback electricity to power network and give an alarm when it stops, and it is setting fit for oil pump.

Method and apparatus are disclosed that enable lasers to be stabilized in absolute frequency to high precision. The principle of operation is to: 1) lock the laser frequency to an etalon transmission resonance, 2) phase modulate the laser beam at a frequency corresponding to the free spectral range of the etalon and lock the phase modulated sidebands to the etalon resonances, and 3) lock the etalon free spectral range frequency to a stable reference frequency derived from, e.g., a stable crystal oscillator. The result is that the laser frequency is locked to an integer multiple of the reference frequency. The invention has applicability to numerous situations where a stable frequency must be provided at a specific value, and has further applicability to stabilizing multiple lasers in different locations to the same value.

The invention provides a non-contact EMAT (Electromagnetic Acoustic Transducer) detection method and system for a micro-mass sensor. According to the invention, an electrostatic magnetic field is generated by magnets, sinusoidal alternating current is introduced into an excitation coil, a resonance piece is placed above the excitation coil, and resonance is generated when the frequency of the excitation coil is the same as the intrinsic frequency of the resonance piece, so that a secondary alternating magnetic field is induced, and in induction current is generated in a differential detectioncoil; and when a minute amount of substance to be measured is adsorbed to a sensitive thin layer covered on the upper surface of the resonance piece, the resonant frequency of the resonance piece drifts, and the substance to be measured is quantitatively measured through calculating the drifting amount of the resonant frequency. The EMAT is introduced, the acoustic vibration is excited and detected by using electromagnetic induction so as to realize a non-contact scheme, complex structures such as a micro-cantilever beam structure are replaced by the simple structure, and the absolute frequency shift is replaced by the relative frequency difference between different modes, thereby reducing disturbance caused by the external environment, and realizing high-precision measurement for the micro-mass substance.

The invention provides a private network channel scrambling method and a private network channel scrambling device. According to the invention, a wireless communication system in a private network is composed of a plurality of discrete frequency points, and each discrete frequency point bears a respective channel. The method comprises the step of carrying out scrambling on channel data by adopting a scrambling code sequence carrying an absolute frequency point index number. The method and the device provided by the invention solve a problem of peak-to-average power ratio caused by an existing channel scrambling method in the condition that the wireless communication system in the private network is composed of a plurality of discrete frequency points.

Rather than down-convert optical frequencies, a QCL laser system directly generates a THz frequency comb in a compact monolithically integrated chip that can be locked to an absolute frequency without the need of a frequency-comb synthesizer. The monolithic, absolute frequency comb can provide a THz frequency reference and tool for high-resolution broad band spectroscopy.

The invention discloses a microwave bandwidth folding and receiving method, comprising: folding the bandwidth of an input band in half to form high and low sub-bands; shifting down the high sub-band to the low sub-band; outputting the low sub-band in which a signal is positioned under the control of a folding code; detecting the sequence of video pulses simultaneously from the high and low sub-bands; and outputting the signal mark (s1) and the folding code (m0). Every time the folder folds, the bandwidth is reduced by double. The normalized error radio frequency, characteristic frequency and absolute frequency are output by folding the bandwidth step by step. The invention has advantages of wide band, good frequency selectivity as well as an instantaneous frequency measurement function without being interfered by overlapped signals. The intercept probability is close to 100%. Due to output normalization, fine frequency measurement becomes possible and a wideband-based digital receiver can be directly obtained. In the invention, conventional components are organically combined and are easy to manufacture.

The present invention discloses a signal switching method and device between different frequency point numbers of a same physical frequency point. The method is characterized in that when a terminal receives a network resource reconfiguration message sent by a base station side, the random access is not carried out on a new absolute frequency point number, while a first absolute frequency point number corresponding to a currently used physical frequency point in a first band, is determined, and after a second absolute frequency point number corresponding to the physical frequent point in a second band supported by the terminal itself, is calculated, the new absolute frequency point number is switched to automatically, thereby avoiding the time delay increase caused by carrying out the random access on the new frequency point number; moreover, the terminal switches to the second band based on the second absolute frequency point number, and carries out the sending compensation on the second band according to the known situation that the channel characteristics of the first and second bands are poor, thereby guaranteeing the normal data sending on the new absolute frequency point number.

Rather than down-convert optical frequencies, a QCL laser system directly generates a THz frequency comb in a compact monolithically integrated chip that can be locked to an absolute frequency without the need of a frequency-comb synthesizer. The monolithic, absolute frequency comb can provide a THz frequency reference and tool for high-resolution broad band spectroscopy.

The invention relates to a Fabry-Perot interference absolute distance measurement method based on a femtosecond optical frequency comb and a device thereof. Two tunable lasers with frequency capable of being tuned within a large range and free of mode skip are simultaneously adopted, the optical wavelengths of the two lasers are respectively locked on two transmission peaks at a distance of N free spectral ranges of a to-be-detected Fabry-Perot cavity with the cavity length located in a vacuum vibration isolation cavity by utilizing the Pound-Drever-Hall (PDH) method, a wavemeter and an optical frequency comb system are used to respectively measure absolute frequency of two beams of laser, and then the free spectral ranges of the to-be-detected Fabry-Perot cavity are obtained. The cavity length of the to-be-detected Fabry-Perot cavity is obtained by means of the relationship between the to-be-detected cavity length and the free spectral ranges, frequency of the two tunable lasers can be tuned within a large range and free of mode skip, and measurement range is increased. Meanwhile, frequency of the two lasers is locked, and measurement speed can be increased. The optical frequency comb system for measuring the frequency of the two lasers enables recurrence frequency and off-set frequency to be traced to the source of microwave frequency standard so that measurement results can have traceability.

A mobile communication system and a method for managing a cell resource in a mobile communication system is disclosed. A resource status report message including UARFCN and sector relating information is reported from a base station to a control station by the unit of CDMA absolute frequency, whereby the control station enables to manage a resource of the base station by the frequency unit. More local cells of the station can be provided by using NBAP protocol without adding to UARFCN of the local cells of the station and messages performing O&M relative to sector.

The invention discloses a method for achieving laser frequency-offset-lock through an F-P interferometer. According to the method, a main laser locked through a traditional absolute frequency stabilizing method is used as a reference, the peak time difference between emergent signals of lasers of the main laser and lasers of an auxiliary laser for jointly transmitting an F-P cavity is used as frequency error signals, and then frequency-offset-lock of the main laser and the auxiliary laser is achieved. The large-range frequency-offset-lock can be achieved without a radio frequency device, and the F-P interferometer has the advantages of being simple in structure, high in stability and the like.

Optical synthesizer tuning using fine and coarse optical frequency combs. Embodiments herein provide an optical frequency synthesizer comprising a coarse optical frequency comb, a fine optical frequency comb, and an output laser. The comb is pumped with a first pump laser and sets the absolute frequency of at least one tooth of the coarse optical frequency comb. The fine comb is pumped with a second pump laser and has a frequency spacing between teeth that is locked to a fractional or integer multiple of the radio frequency reference. Initially, the second pump laser is locked to the first tooth of the coarse optical frequency comb. The optical frequency synthesizer can be tuned by scanning the second pump laser and locking the second pump laser to the desired tooth. An output signal can then be generated with the output laser based on the teeth of the fine comb after the second pump is locked to the desired tooth.

Accurate measurement of the period of the embedded clock oscillator using the charge time measurement unit CTMU maintains the desired frequency accuracy of the embedded clock oscillator over time, temperature, and operating condition variations. The CTMU determines the free-running frequency of the embedded clock oscillator and provides very accurate frequency (period) information used to confirm that the desired frequency (e.g., within 0.25% of the desired frequency) is running or convert the clock to An indication of how much and in which direction the frequency of an oscillator is adjusted to maintain the desired frequency accuracy. Automatic frequency adjustment of the embedded clock oscillator can be implemented in order to maintain its desired precise frequency. The temperature and voltage compensation profiles used to maintain the accuracy of the CTMU may be stored in a table, such as in non-volatile memory, for further improving the absolute frequency accuracy of the embedded clock oscillator .

The invention discloses a frequency-multiplier klystron and a manufacture method thereof, relating to the technique of electron tubes. A microwave actuating signal with the frequency of f is used as an input signal; electron beams are in manual action with multiple resonant cavities of the conventional klystron in vacuum; ultraharmonics components in the Fourier spectrum of the electron beams areobviously increased after good cybotaxis is achieved; an output structure adopts the output structure of a wave band where frequency nf is positioned or utilizes the higher order mode of the conventional structure; the ultraharmonics components of the frequency nf, namely, the input frequency f and the output frequency nf, are derived from the electron beams in high cybotaxis so that the microwave small signal is amplified and the frequency is multiplied to nf from f strictly in integer multiples. The method of the invention is simple and easy to implement, and the manufactured frequency-multiplier klystron can keep comparative frequency multiplication grain, good spectrum purity, wider absolute frequency multiplication bandwidth and higher power capability.

A method determines a distance with a specified accuracy. The method transmits to an interferometer a test signal oscillating with a test frequency and receives, in response to the transmitting, an interferometric signal formed by interfering the test signal with a delayed signal produced by delaying a copy of the test signal over the distance equal to a path length difference in the interferometer. The test frequency is varying such that the test signal oscillates with different values of the test frequency. The method determines at least two values of the test frequency corresponding to particular values of the interferometric signal by beating the test signal with a reference signal having a reference frequency, wherein a value of the reference frequency is an absolute value predetermined with the specified accuracy. The method determines the distance using the two values of the test frequency.