126results about How to "Increase buff effect" patented technology

The invention discloses a forward error correction encoding, decoding method, an apparatus and a system and belongs to the communication field. The method comprises: determining check matrix parameters of LDPC recurrent code of a time varying period according to transmission system performance, complexity and codon synchronization alignmental, constructing a QC-LDPC check matrix according to determined check matrix parameters and obtaining the check matrix HC of time variant LDPC recurrent code according to the QC-LDPC check matrix; blocking to-be-encoded data according to HC requirement, encoding every blocking data based on HC and obtaining a plurality of codens of LDPC recurrent code; adding the plurality of codens of LDPC recurrent code to data frames and sending the codens of LDPC recurrent code. The invention carries out forward error correction by adopting time variant LDPC recurrent code and LDPC recurrent code has a QC-LDPC structure. Because QC-LDPC checking characters can reduce checking complexity, the performance of LDPC recurrent code is superior to the performance of LDPC block code and the performance of time variant LDPC recurrent code is superior to the performance of time invariant LDPC recurrent code, the invention can be appropriate for a high-speed optical transmission system and satisfy requirements of high gain performance and high throughput.

The invention provides a weak signal detection amplification system based on an optoelectronic oscillator and a detection amplification method thereof, and belongs to the technical field of microwavephotonics. The weak signal detection amplification system based on the optoelectronic oscillator comprises a laser, a beam splitter, a phase modulator, a high-nonlinearity optical fiber, a circulator,a photoelectric detector, a power divider, a coupler, an electric amplifier, an intensity modulator, an adjustable optical attenuator and a radio frequency source. Wherein the laser is connected withthe beam splitter, the beam splitter is respectively connected with the phase modulator and the intensity modulator, and the phase modulator, the circulator, the photoelectric detector, the power splitter, the coupler and the electric amplifier are sequentially connected end to end to form a loop; Wherein the intensity modulator, the variable optical attenuator and the circulator are sequentiallyconnected, the radio frequency source is connected to the intensity modulator, and the phase modulator is connected with the circulator through a high-nonlinearity optical fiber. By adjusting the radio frequency source and the adjustable optical attenuator, rapid and high-precision weak signal detection and amplification can be realized.

A compact multiple-frequency Z-type Inverted-F antenna includes a dielectric substrate having a horizontal axis and a vertical axis perpendicular to the horizontal axis. A feed point is disposed along the horizontal axis on a first side of the vertical axis and a ground strip is disposed along the horizontal axis on a second side of the vertical axis opposite the feed point. A plurality of wedge-shaped radiating traces is arranged symmetrically with respect to the horizontal axis and disposed on the first side of the vertical axis. A plurality of wedge-shaped ground traces symmetrical to the plurality of radiating traces with respect to the vertical axis are disposed on the second side of the vertical axis.

The invention discloses a GaAs HBT high-gain broadband linear transconductance unit circuit comprising an input stage subcircuit, a basic transconductance subcircuit, a linear subcircuit, a negative resistance subcircuit and a mirror current source subcircuit, wherein the input stage subcircuit is used for level shift of input differential voltages IN_P and IN_N and conducts shifted signals into the basic transconductance subcircuit; the basic transconductance subcircuit is used for converting the input differential voltage signals into differential current signals; the linear subcircuit is used for improving the linearity of the basic transconductance subcircuit; the negative resistance subcircuit is used for improving the gain of the transconductance circuit; and the mirror current source subcircuit is used for providing bias current for the rest circuits. The circuit is designed and manufactured by a GaAs HBT technology and has wide operation bandwidth; the adopted linear subcircuit can effectively complement the nonlinearity of the circuit and provides excellent linearity; and the negative resistance subcircuit is adopted to effectively solve the conflict between the high-gainrequirement of circuits and transistor saturation and improves high-gain performance.

The invention relates to a method for amplifying two-cell Brillouin scattering by controlling a polarization state. In order to do research on the influence of the polarization state of pumping light and seed light on an SBS (stimulated Brillouin scattering) gain in a two-cell Brillouin amplification system, the invention provides the method for amplifying the two-cell Brillouin scattering by controlling the polarization state. The method is characterized in that: a light path of the pumping light is provided with a polarization state control device on the basis of the conventional Brillouin amplification technology; the polarization state of the pumping light is precisely changed by the polarization state control device; when the polarization state of SBS seed light remains unchanged, a polarization included angle between two beams of light can be controlled by changing the polarization state of the pumping light; one light power meter receives the SBS seed light (which is not amplified by amplified light) before an amplification cell, while the other light power meter receives amplified SBS signal light; and an SBS gain coefficient is obtained by comparing and calculating the readings of both the power meters.

The invention discloses a transconductance amplifier with low noise and a high output resistance. The transconductance amplifier is provided with a transistor M1, a transistor M2, a transistor M3, an inductor Lm, an inductor Lg, a capacitor Cd, a capacitor Cb, a resistor R1 and a resistor R2. An input signal is connected with the grid of the M1; the source of the M1 is grounded; a bias is added to the grid of the M1 via the R1; the drain of the M1 is connected with the source of the M3, one end of the Cd and one end of the Lm; the other end of the Cd and the other end of the Lm are connected with the grid and the source of the M2, respectively; the source of the M2 is connected with one end of the Cb, while the other end of the Cb is grounded; the R2 is arranged between a Vdd and the grid of the M2; the Lg is arranged between the source of the M2 and the Vdd; the drain of the M2 is connected with the grid of the M3; and the drain of the M3 is a current output end. As feedback is introduced, the voltage between the grid and source of the M3 is enhanced, the equivalent transconductance is improved, the output resistance is increased, and the noise brought by the M3 is inhibited. The transconductance amplifier has the characteristics of high transconductance and output resistance and low noise, and is applicable to the application occasions such as a millimeter wave low noise amplifier.

A method for improving gain performance of a Viterbi decoder wherein data relating to the best path and a secondary path are stored for the Viterbi decoder. Slicer errors are determined for the best path and the secondary path for current symbols using the stored data and errors for previous symbols are corrected responsive to the determined slicer errors.

The embodiment of the invention discloses an audio processing method and device, computer equipment and a storage medium. The audio processing method comprises the steps of: obtaining positive samplefrequency spectrum characteristics of positive sample audio, and obtaining negative sample frequency spectrum characteristics of negative sample audio; determining the predicted audio gain of the negative sample audio based on the sample gain prediction model and the negative sample spectrum characteristics; determining a sample audio gain of the negative sample audio according to the positive sample frequency spectrum feature and the negative sample frequency spectrum feature, adjusting a model loss function of a sample gain prediction model according to the sample audio gain or the prediction audio gain, and training the sample gain prediction model according to the adjusted model loss function to obtain a target gain prediction model, wherein the target gain prediction model is used forpredicting the target audio gain of the target audio. By adopting the audio processing method and device, the prediction accuracy of the prediction model can be improved.

A laminated vehicle window has different glass substrates and a low-emissivity (low-E) coating on an interior surface thereof, so that the low-E coating is to be located adjacent and exposed to the vehicle interior. In certain example embodiments, the low-E coating includes a transparent conductive oxide (TCO) layer of a material such as indium-tin-oxide (ITO). In certain example embodiments, the exterior glass substrate contains more iron, and is thus more absorbing of IR radiation, than the interior glass substrate.

The invention provides a radome, an antenna structure and a wireless electronic device. The antenna structure comprises a radome and a radiator located inside the radome; Where (n-1) *[Lamda]1/2 (H1 (n*[lamda]1/2, H1 denotes the thickness of the radome,[Lamda]1 denotes the propagation wavelength of the electromagnetic wave emitted by the radiator in the radome, and n is a positive integer; And/or,L=a*b*[lambda]0, L denotes the length of the line segment from the radiation surface of the radiator to the inner side of the radome, the centerline being a straight line perpendicular to the radiation surface of the radiator, [lambda]0 denotes the propagation wavelength of electromagnetic waves emitted from the radiator in air, a denotes a preset parameter, and b is a positive integer. In this way, the directivity and gain effect of the electromagnetic wave beam can be enhanced, so as to compensate the loss of the electromagnetic wave in the wireless transmission and achieve a longer wireless transmission distance, thereby improving the overall performance of the antenna structure, reducing the area, circuit complexity and corresponding cost required by the conventional design, and enhancing the overall competitiveness of the product.

The invention discloses a full positive dispersion and full polarization maintaining optical fiber laser. The full positive dispersion and full polarization maintaining optical fiber laser comprises a first optical fiber coupling Faraday polarization rotating mirror, a ytterbium-doped fiber, a wavelength division multiplexer, a pump light isolator, a semiconductor laser LD, a polarization maintaining optical fiber coupling polarization beam splitter, a polarization maintaining optical fiber coupling total reflecting mirror, a polarization maintaining optical fiber coupler, a polarization maintaining single-mode fiber, a second optical fiber coupling Faraday polarization rotating mirror and a narrow-linewidth band-pass filter. Through the design of a cavity structure, when laser pulse has a single round trip in an optical fiber laser cavity, the laser pulse is amplified multiple times, pulse gains are increased, and the single pulse energy of output light pulse is higher. Through the optical fiber coupling Faraday polarization rotating mirrors at the two ends of a standing wave cavity, the whole optical fiber laser cavity compensates the linear noise and disturbance caused by the environment and is not influenced by the outside. The full positive dispersion and full polarization maintaining optical fiber laser is simple in structure, easy to debug and small in environment interference, and has broad application prospects in the industrial field.

The invention discloses an antenna mechanism. Four first rectangular antennas, each two of which are mutually orthogonal to each other, are arranged on an antenna substrate. A phase-shifted feed network is arranged on the antenna substrate and is used for feeding power to the four monopole antennas, wherein the feeding phases are orthogonal to each other. According to the invention, with the fourfirst rectangular antennas arranged orthogonally, the circular polarization of the antenna is realized based on a feeding mode with the orthogonal feeding phases; and on the basis of the setting modeof all parts of the antenna mechanism, technical effects of miniaturization and high gain of the antenna mechanism are guaranteed.

The invention discloses a purpose of a water-quality purifying agent containing biological enzymes, and particularly relates to the purpose of the water-quality purifying agent containing biological enzymes for polluted water quality purification. The water-quality purifying agent is prepared from the following ingredients in parts by weight: 20 to 25 parts of enzyme loading sorghum straw active carbon, 4 to 6 parts of sodium alginate, 6 to 8 parts of polyferric chloride, 3 to 7 parts of polyaluminium chloride, 30 to 35 parts of modified bentonite, 3 to 7 parts of polyacrylamide, 3 to 8 partsof plant fiber and 200 to 300 parts of distilled water. The purpose has the beneficial effects that all of the ingredients in the water-quality purifying agent can achieve the cooperated effect; through physical and chemical adsorption, harmful substances such as nitrogen, phosphorus, organic matters and heavy metal ions in the sewage can be effectively eliminated, so that impurities, eutrophication substances and the like can be settled through flocculation; meanwhile, the relatively good surface performance is realized; the selective adsorption effect on the organic contaminants is good.

The invention relates to a low-wear scratch-resistant ABS material and a preparation method thereof. Blending of ABS with PMMA and addition of an inorganic filler, a slip agent and the like improve the resistance of the ABS to wear and scratch in order to solve the problem of poor wear resistance of the ABS. The low-wear scratch-resistant ABS material comprises, by weight, 70-90 parts of ABS resin, 10-30 parts of polymethyl methacrylate, 1-5 parts of maleic anhydride grafted styrene, 0.2-2 parts of a lubricant, 0.2-2 parts of an antioxidant, 0.5-10 parts of the slip agent, 0.5-5 parts of silicone master batches and 2-20 parts of the inorganic filler. The prepared ABS has a high pencil hardness, and has a lower wear resistance than the ordinary ABS, and the mechanical properties and the processing fluidity are not significantly less than those of the ordinary ABS.

The invention relates to a slab laser amplifier and a laser output method. The slab laser amplifier comprises a gain dielectric module, pumping modules, and a reflector module, wherein the reflector module comprises two reflectors which are located on the left and right sides of the gain dielectric module; the pumping modules are located on the front and rear sides of the gain medium module; laser crystals are 0.5-1.5mm thick and include one doped laser crystal and two non-doped laser crystals; the two non-doped laser crystals are bonded to the two long and high surfaces of the doped laser crystal without adhesive, respectively, and arranged in parallel with the doped laser crystal; after seed laser is incident into the laser crystals at a certain angle, the seed laser is reflected back and forth between the reflectors, and meanwhile, passes through the laser crystals between the reflectors, and finally, the power amplified laser can be output. The bonded laser crystals of an ultrathin slab structure are taken as the gain dielectric of the slab laser amplifier, the thermal effect of the laser crystals is reduced and the gain effect of the gain dielectric is improved; high-output power and high-beam quality continuous or pulse laser amplified output can be obtained.

The invention discloses a mid-far infrared avalanche photodetector which comprises a substrate, a buffer layer, a lower ohmic contact layer, a multiplication layer, a charge layer, a gradient layer, an absorption layer and an upper ohmic contact layer which are sequentially connected from bottom to top, and the doping type of the substrate and the buffer layer is n type. Or the mid-far infrared avalanche photodetector comprises the substrate, the buffer layer, a second ohmic contact layer, the absorption layer, the gradient layer, the charge layer, the multiplication layer and a first ohmic contact layer which are sequentially connected from bottom to top, and the doping type of the substrate and the buffer layer is p type, wherein the multiplication layer is made of an AlAsxSb1-x material, x is greater than or equal to 0.12 and less than or equal to 0.18, the gradient layer is of a plurality of (InAs)m/(AlAs0.15Sb0.85)n quantum well structures or an InyAl1-yAszSb1-z material, and thedetection wavelength of the absorption layer is a middle and far infrared band. The mid-far infrared avalanche photodetector provided by the invention can block dark current and reduce noise, does notneed a cooling device, improves the working temperature of the device, reduces the cost, and is convenient to use.

The invention provides a satellite signal acquisition method and device. The method includes the following steps that: down sampling processing is performed on the signal pseudo codes of transmission signals of N cycles, so that second type signal pseudo codes can be obtained; the second type signal pseudo codes and local pseudo codes in each cycle are evenly divided into P segments of signal pseudo codes respectively; coherent accumulation is performed on the second type signal pseudo codes in each segment of signal pseudo codes in each cycle under corresponding segments respectively; the number of the times of initial bit jump in a previous cycle in adjacent cycles is obtained; the number of the times of final bit jump in each cycle is obtained; the second accumulated value of the P segments is obtained according to the number of the times of final bit jump in each cycle; and fast Fourier transformation is performed on the second accumulated value of the P segments, and satellite signals are acquired according to a local acquisition threshold value. The satellite signal acquisition method and device provided by the embodiments of the invention is suitable for the acquisition of satellite signals of a plurality of cycles, and time for coherent integration can be increased, and satellite signals with lower intensity can be acquired, and the sensitivity of signal acquisition can be improved.