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 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 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 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 application discloses a generating and processing method of a pilot frequency sequence in a wireless communication system. The method comprises a step of generating a pilot frequency sequence for the pilot frequency position in the synchronization frame in an (nPRB)th frequency point according to a cell identification and the absolute frequency point index number of the (nPRB)th frequency point, and a step of mapping the generated pilot frequency sequence to the pilot frequency position corresponding to the synchronization frame in the (nPRB)th frequency point. By using the method, the pilot frequency structure of the resource allocation scheme of a downlink synchronization frame can be correctly matched.