26 results about "Bandwidth compression" patented technology

The invention discloses a bridge main cable intelligent monitoring system. The core of the system is composed of a gateway host, an industrial control module and a data transmission module. The industrial control module realizes millisecond-level instruction response and cooperates with the data transmission module to complete data lossless transmission from the sensor module to the cloud, and the sensor module integrates temperature, humidity, inclination angle, acceleration and displacement sensors through an RS485 converter to realize full-dimensional state sensing of a main cable. The data acquisition module guarantees sampling synchronism with high resolution, the data preprocessing module completes 70% bandwidth compression at the edge end, the cloud load is greatly reduced, intelligent access and management are carried out on a sensor, management of intelligent equipment is achieved, and collection, processing, analysis and storage of sensor data are involved. The gateway development considers the preprocessing of the received sensor data, the extraction of key information, and the transmission of the data to the cloud for analysis and storage, and achieves the high-reliability monitoring through the edge intelligent closed loop and redundancy design.

The invention discloses a simulation method and system for improving the simulation efficiency of a PIN diode, and belongs to the technical field of semiconductor device simulation, and the method comprises the steps: firstly, employing a hash table data structure to optimize the preprocessing process of a semiconductor physical model time domain numerical method, and remarkably improving the parameter preprocessing efficiency; carrying out bandwidth compression optimization on the sparse matrix in combination with an inverse Cuthill-Mckee matrix reordering algorithm; and secondly, constructing a parallel iteration solver architecture to realize efficient distributed solution of a large nonlinear matrix equation. Through cooperative application of the method, the overall calculation efficiency of a PIN diode numerical simulation program is improved by more than three times compared with that of traditional commercial simulation software COMSOL on the premise that the calculation precision is kept, the industrial problem that the simulation timeliness of a semiconductor device is limited is effectively solved, and an innovative technical path is provided for high-precision real-time simulation. The method has important application value in the fields of power device design, integrated circuit simulation and the like.

The invention belongs to the technical field of wireless communication, and particularly relates to a communication sensing integrated system based on non-orthogonal AFDM (Alternating Frequency Division Multiplexing). According to the system, a bandwidth compression factor is introduced into an AFDM framework to construct a non-orthogonal waveform, and controllable overlapping between chirp subcarriers is realized, so that the spectrum utilization rate is improved, and the robustness of the system under a high-speed dynamic channel is enhanced. And a receiving end realizes reliable information recovery through maximum likelihood detection, and processes echo signals in combination with a two-dimensional parameter estimation algorithm so as to realize high-precision sensing of the target distance and speed. The system has good anti-Doppler capability and perception precision performance, and is suitable for communication perception fusion application in a high-speed mobile scene.

The invention discloses a second harmonic bandwidth compression device and method based on a chirped body Bragg grating, and relates to the technical field of high-resolution laser spectrum analysis, and the device comprises a beam splitting module, the chirped body Bragg grating, a focusing lens and a BBO crystal. The beam splitting module is used for splitting incident laser into two paths of fundamental frequency light to obtain transmission fundamental frequency light and reflection fundamental frequency light; the chirped volume Bragg grating is used for performing positive chirp on the transmission fundamental frequency light to obtain positive chirp laser; performing negative chirp on the reflected fundamental frequency light to obtain negative chirp laser; the focusing lens is used for shrinking the positive chirp laser and the negative chirp laser to the center of the BBO crystal; and the BBO crystal is used for performing sum frequency on the positive chirp laser and the negative chirp laser and outputting second harmonic laser with narrow linewidth. The chirped volume Bragg grating is introduced to replace a traditional complex optical element combination, the structure of the bandwidth compression system is simplified, dependence on precise optical path calibration is reduced, and therefore the influence of external interference factors is reduced.

The present application relates to the field of sound system self-checking and assembly defect diagnosis, aiming to realize the automatic identification and tracing of speaker assembly defects. The core technology includes collecting the acoustic feedback of the speaker after frequency sweep excitation through the microphone, obtaining high-quality time-domain signals, and using signal energy window judgment and segmented windowed Fourier transform to extract frequency domain features. Based on the six-dimensional interpretable feature vector, a solidified weight full connection encoder is used to generate a squeak fingerprint code, realizing defect mode activation intensity analysis. Combined with the fault knowledge base, a multi-modal evidence package containing spectral highlights and natural language diagnostic conclusions can be output, and low-bandwidth compression and Bluetooth BLE protocol are supported for tracing the production line quality. This scheme improves the defect identification accuracy and diagnostic interpretability, facilitating production line automation and product quality tracing.

The invention discloses an acoustic Doppler received signal processing method and device. The method comprises the following steps: executing first-stage simulation coarse tuning filtering processing on a received underwater acoustic signal through a low-noise tunable amplification circuit; bandwidth compression filtering processing is performed on the signal subjected to the first-stage analog coarse tuning filtering processing through a fully differential amplification circuit; performing second-stage simulation fine tuning filtering processing on the signal subjected to bandwidth compression filtering processing through a programmable band-pass filter; converting the analog signal subjected to the second-stage analog fine tuning filtering processing into a digital signal through a fully differential analog-to-digital conversion circuit; and in the digital domain, third-stage digital fine locking filtering processing is carried out on the digital signal through the FPGA processing circuit. According to the scheme of the invention, a signal processing architecture with deep fusion of analog and digital domains, step-by-step focusing and adaptive tracking is constructed, and the efficiency and performance of capturing and accurately analyzing weak Doppler signals in a complex underwater acoustic environment are remarkably improved.

This application discloses an acoustic Doppler receiving signal processing method and apparatus. The method includes: performing a first-stage analog coarse-tuning filtering on the received underwater acoustic signal using a low-noise tunable amplifier circuit; performing bandwidth compression filtering on the signal after the first-stage analog coarse-tuning filtering using a fully differential amplifier circuit; performing a second-stage analog fine-tuning filtering on the signal after the bandwidth compression filtering using a programmable bandpass filter; converting the analog signal after the second-stage analog fine-tuning filtering into a digital signal using a fully differential analog-to-digital converter circuit; and performing a third-stage digital fine-locking filtering on the digital signal in the digital domain using an FPGA processing circuit. Using the scheme of this application, a signal processing architecture with deep integration of analog and digital domains, step-by-step focusing, and adaptive tracking is constructed, significantly improving the efficiency and performance of capturing and accurately analyzing weak Doppler signals in complex underwater acoustic environments.

The invention belongs to the technical field of terahertz electromagnetic wave sources, and discloses a terahertz traveling wave feedback oscillator based on an external feedback circuit, which comprises a traveling wave tube with an input port and an output port, an external feedback loop is arranged between the input port and the output port of the traveling wave tube and is used for forming a signal feedback path; the external feedback loop comprises a directional coupler, an adjustable attenuator, an adjustable phase shifter and a filter which are connected in sequence, and the resonance characteristic of the filter can be adjusted; the input end of the directional coupler is connected with the output port of the traveling wave tube, the straight-through end of the directional coupler is used as the power output end of the oscillator, and the coupling end of the directional coupler is connected with the input end of the adjustable attenuator; the problems that in the prior art, an inner feedback structure of a traveling wave tube feedback oscillator easily causes port mismatch and bandwidth compression, and an outer feedback system lacks an independent regulation and control mechanism due to multi-parameter coupling, so that the frequency spectrum purity, the tuning freedom degree and the output stability are difficult to consider at the same time are effectively solved.

The invention discloses a machine learning-oriented semantic communication with a scalable compression ratio, which mainly considers an actual semantic communication technology oriented to a machine learning task and solves the influence of channel quality and bandwidth on semantic transmission quality of a communication system. The method comprises the following steps: firstly, preprocessing an image source, and extracting semantic features by using a residual convolutional neural network; secondly, adjusting and learning semantic features according to a channel signal-to-noise ratio through an attention mechanism, and performing length adjustment on the semantic features by using a binary mask vector according to a given compression ratio; then, the optimal bandwidth compression ratio of the communication system is predicted through the prediction network. And finally, the receiving end inputs the compressed semantic features into networks such as a full-connection classifier to execute specific tasks. Comparison experiments prove that the performance of the method provided by the invention is improved, and compared with a fixed bandwidth, the bandwidth compression ratio can be adaptively adjusted according to the real-time change of the signal-to-noise ratio of the channel and the bandwidth of the channel, so that the performance and efficiency of a semantic communication system are effectively improved.

Aspects presented herein relate to methods and devices for data processing including an apparatus, e.g., a CPU. The apparatus may obtain an indication of a set of data subunits corresponding to at least one data unit. The apparatus may also arrange data for the set of data subunits into a first data order for the set of data subunits. Further, the apparatus may perform at least one of an encoding process or a decoding process on the data for each data subunit of the set of data subunits. The apparatus may also rearrange the data for the set of data subunits into the first data order for a first data subunit in the set of data subunits and into a second data order for at least one second data subunit in the set of data subunits, where the first data order is different from the second data order.

The application relates to a bus network multi-priority flow admission control and dynamic planning method, and belongs to the technical field of wired communication network resource dynamic scheduling and planning. The method comprises the following steps: solving a first scheduling scheme of TT flows satisfying the condition that the end-to-end worst-case time delays of all RC flows are not more than the corresponding end-to-end time delay deadlines based on the to-be-admitted TT flows and performing; if the solving fails, solving a second scheduling scheme of TT flows in which the number of RC flows with end-to-end worst-case time delays exceeding the corresponding end-to-end time delay deadlines is as small as possible; if the solving fails, the TT flow admission is not passed; and if the solving succeeds, solving a compression scheme of part of the RC flows based on the second scheduling scheme, and reducing the transmission quality by using the bandwidth compression of part of the RC flows to exchange for the communication continuity of all the RC flows. The method minimizes the influence of the newly-admitted TT flows on the RC flows, increases the admission probability of the TT flows, and solves the problem that the newly-admitted TT flows affect the end-to-end delay of the RC flows and cause the end-to-end timeout of the RC flows.

A flexible spectral efficiency chirp multi-carrier signal generation method based on zero insertion and zero padding belongs to the technical field of chirp multi-carrier signal generation. The present invention solves the problem that the spectrum efficiency of existing non-orthogonal chirp multi-carrier multiplexing technology is limited, as well as the applicability and versatility of the existing non-orthogonal chirp multi-carrier multiplexing system structure are limited. The transmitting and receiving ends of the present invention add zero insertion and zero padding operations after the first phase rotation. By controlling the number of zero insertion and zero padding, the number of points of DFT and IDFT can be adjusted to adjust the bandwidth compression factor in the chirp multi-carrier multiplexing system, thereby providing flexible and variable spectrum efficiency, solving the problem of limited spectrum efficiency range caused by the number of operation points must be an integer and a power of 2 in the chirp multi-carrier signal generation process, further expanding the structural applicability of the chirp multi-carrier multiplexing system, and having greater versatility. The method of the present invention can be applied to chirp multi-carrier signal generation.

The utility model provides an L-band four-phase shifter, which comprises at least two phase shifting units and a closed connecting piece connected between the phase shifting units, so as to obtain the required phase shifting amount through the cooperation between the phase shifting units. According to the invention, the open end of the phase shifting unit is connected with the open interface of the closed connecting piece, and impedance matching with the phase shifting unit is realized by using the feed network of the closed connecting piece and the corresponding dielectric element. By flexibly selecting the corresponding phase shifting units and the closed connecting pieces, the flexibility of the phase shifter can be effectively improved by utilizing the feed network, the dielectric elements and the corresponding dielectric phase shifter structures, the bandwidth of the phase shifter is effectively expanded, the size of the phase shifter is reduced, the insertion loss of the phase shifter is reduced, and the power capacity of the phase shifter is improved.

The present invention discloses a femtosecond laser sum-frequency spectrum detection device based on dispersion and bandwidth compression. The femtosecond infrared laser beam generated by a laser is split into a first and a second split beam. The first split beam is converted into femtosecond mid-infrared light; the second split beam is converted into picosecond green light. The picosecond green light passes through a first aperture, then is simultaneously focused by a stroke-adjustable reflective unit and the wavelength-tunable femtosecond mid-infrared light generated by the aforementioned frequency doubling / difference frequency module onto a point on a Y-cut quartz crystal. The Y-cut quartz crystal generates an intrinsic sum-frequency signal. After passing through a quartz glass sheet, the intrinsic sum-frequency signal is focused together with the picosecond green light and femtosecond mid-infrared light emitted from the Y-cut quartz crystal onto a point on the surface of a sample to be measured, generating a sample sum-frequency signal. The intrinsic sum-frequency signal and the sample sum-frequency signal are transmitted collinearly into a spectrometer. The present invention employs a simple and direct spectral bandwidth compression method, significantly reducing complexity, compressing the spectral bandwidth of green light, and enabling sum-frequency spectrum detection.

A video decoder with in-loop memory bandwidth compression is provided. A video decoder includes a decoding logic configured to decode an encoded bitstream to generate a reference block of video data, and a memory bandwidth compression logic configured to compress the reference block of video data based on a selection between a first compression algorithm, second compression algorithm, or to copy the reference block without compression. Selection is based on at least one of the first block size, second block size, or uncompressed block size. The selected block is written to an off-chip memory, and a compression algorithm indicator associated with the selected block is written to an on-chip memory.

The embodiment of the invention discloses an equipment detection method based on narrowband communication. The method comprises the following steps: determining to-be-detected power grid equipment without public network coverage in a target area; acquiring an operation state image or video stream of the power grid equipment; performing semantic compression coding on the running state image or video stream of the power grid equipment to generate low-bandwidth compressed data; transmitting the low-bandwidth compressed data to a remote monitoring center by a satellite link through narrow-band satellite communication equipment; the remote monitoring center is used for decoding the received low-bandwidth compressed data and reconstructing a monitoring image of the power grid equipment; and detecting the operation state of the power grid equipment based on the reconstructed monitoring image. According to the method, massive images and video data are converted into semantic information with an extremely low code rate through semantic compression coding, and the problem that a narrow-band satellite channel cannot transmit traditional videos is solved.

The present application relates to a kind of stepped inverted ridge structure short axial length dual-polarized compact range feed antenna, wherein inverted ridge fin part adopts stepped fin, cooperate with small angle of aperture conical waveguide structure can effectively expand working bandwidth, compress horn axial length, reduce voltage standing wave ratio;Feed probe adopts four standard coaxial connector connected coaxial cable;Feed uses horn design with axial slot, can realize beam with wideband equalization, stable phase center and low cross polarization, after optimization, feed full-band realizes voltage standing wave ratio less than 1.5.The four-ridge horn feed has the outstanding advantages of simple structure, small size, light weight and low cost.

The invention relates to the technical field of satellite communication, in particular to a satellite communication digital signal self-adaptive amplification method and system based on link perception. The method comprises the following steps: collecting and analyzing signal-to-noise ratio data fed back by a target terminal and power detection data of a local transmitter, and executing power boundary joint judgment to form a limit saturation status word; analyzing a link quality loss value by using the extreme saturation state word; performing energy spectrum density compensation conversion on the link quality loss value to obtain a bandwidth compression coefficient; performing equal-energy bandwidth compression calculation according to the bandwidth compression coefficient to obtain a rate reduction configuration parameter; and calculating an energy loss decibel value according to the drop rate configuration parameter, and determining a gain compensation coefficient. According to the method, digital-analog cooperative control is implemented under the physical saturation limit of the power amplifier, and the signal power spectral density is improved on the premise that the total transmitting power is constant, so that the hardware transmission limit is broken through in an extremely severe channel to maintain a communication link.

The invention designs an analog-digital hybrid multiple access method based on time scanning-time delay cross-correlation, and belongs to the field of wireless communication. The method comprises the following steps: deeply analyzing a bottom layer principle related to sliding, carrying out band-pass filtering (BPF) processing on a transmitting signal received by a receiving end, and generating a local generation signal by utilizing a multi-frequency signal formed by a limited number of cosine functions; the filtered receiving signal is multiplied by a local generation signal to realize bandwidth compression; the frequency of the multi-frequency signal is of a series of equal-amplitude Dirac comb-shaped structures, and the frequency spectrum interval is slightly smaller than the frequency spectrum interval of the sending signal; and performing low-pass filtering on the multi-frequency signal after bandwidth compression through a low-pass filter, removing distorted interference information, sampling the filtered signal, and obtaining a detection pulse and a sequence after matched filtering in a digital domain through digital-to-analog conversion. According to the scheme, the characteristic of bandwidth compression is reserved, and meanwhile the number of hardware circuits is minimized, so that low-cost and high-precision multi-link CIR estimation in an MISO scene is achieved.

Aspects presented herein relate to methods and devices for data processing including an apparatus. The apparatus may obtain an indication of source data associated with a plurality of source components including a first source component and a second source component. The apparatus may also code the first source component based on a first prediction algorithm and the second source component based on the first prediction algorithm and a second prediction algorithm. Further, the apparatus may determine a first rate of the first prediction algorithm and a second rate of the second prediction algorithm based on the coding of the first source component and the second source component. The apparatus may also select the first prediction algorithm or the second prediction algorithm for a portion of a coding unit based on the first rate of the first prediction algorithm and the second rate of the second prediction algorithm.

The invention provides an industrial DCS network health monitoring system. Firstly, four-dimensional behavior data of the maximum connection number, the connection duration, the communication frequency and the single communication length are periodically collected; secondly, through dynamic weight distribution and a non-linear scoring rule, object importance differences are reflected, attribute abnormal features are captured, and accurate quantification of a single health value and a comprehensive health value is achieved; and finally, through an alarm-current limiting-turn-off three-level linkage mechanism, accurate isolation of abnormal objects is realized on the premise of maintaining key communication, meanwhile, a built-in attenuation factor and a dynamic weight adjustment function of the system enable the health assessment model to be adaptive to communication load fluctuation, the early warning accuracy in a bandwidth compression state is greatly improved, and the early warning efficiency is improved. The fault positioning time in the communication blocking state is further shortened, closed-loop management of'monitoring-evaluation-disposal 'is formed on the whole, and the technical defects that a traditional scheme is coarse in monitoring granularity, single in disposal means and lagged in early warning are effectively overcome.

The invention relates to a high-power high-stability narrow-linewidth external cavity semiconductor laser and application thereof, and belongs to the technical field of lasers. The laser comprises a gain chip, a collimating lens, a polarization beam splitter, an F-P etalon A, an F-P etalon B, a narrow-band-pass filter, a focusing lens, a partial reflection RSOA, a collimating lens and an isolator which are sequentially arranged along a light path. According to the invention, the double F-P etalon is arranged in the external cavity laser, a vernier effect is formed through different free spectral ranges and central wavelength bandwidths of the double F-P etalon to screen spectrums and compress the bandwidths, and wavelength tuning and further bandwidth compression can be carried out through incident angle fine tuning of the double F-P etalon. Single-mode screening and linewidth compression are carried out through a narrow-band-pass filter, and finally single-mode narrow-linewidth output is obtained through cooperation with an external cavity laser.

The application relates to the technical field of audio transmission, and discloses a USB multi-channel audio adaptive transmission method and system based on content perception, wherein the method comprises the following steps: performing frame division and fast Fourier transform on first audio data stream to obtain a multi-channel content feature matrix; calculating a content complexity score and a bandwidth compression ratio according to the multi-channel content feature matrix, and generating a first channel transmission parameter configuration table according to the content complexity score and the bandwidth compression ratio; reconstructing an audio stream format descriptor and a synchronization endpoint descriptor according to the first channel transmission parameter configuration table to obtain a USB transmission configuration snapshot; and packing the first audio data stream into a USB audio data packet, and transmitting the USB audio data packet to a Dolby decoder through a synchronization endpoint corresponding to the USB transmission configuration snapshot, so that the overall quality and stability of multi-channel audio transmission under the condition of limited USB bandwidth are improved.

This invention relates to the field of satellite communication technology, and more particularly to a link-aware adaptive amplification method and system for satellite communication digital signals. The method includes the following steps: acquiring and analyzing the signal-to-noise ratio data fed back by the target terminal and the power detection data of the local transmitter, and performing a joint power boundary determination to form a limit saturation state word; analyzing the link quality deficit value using the limit saturation state word; performing energy spectral density compensation conversion on the link quality deficit value to obtain a bandwidth compression coefficient; performing equal-energy bandwidth compression calculation based on the bandwidth compression coefficient to obtain a rate reduction configuration parameter; calculating the energy loss in decibels based on the rate reduction configuration parameter to determine the gain compensation coefficient. This invention, by implementing digital-analog collaborative control under the physical saturation limit of the power amplifier, achieves an increase in signal power spectral density while maintaining a constant total transmit power, thereby breaking through the hardware transmission limit in extremely harsh channels to maintain the communication link.

Aspects presented herein relate to methods and devices for data processing including an apparatus. The apparatus may obtain an indication of source data associated with a plurality of source components including a first source component and a second source component. The apparatus may also code the first source component based on a first prediction algorithm and the second source component based on the first prediction algorithm and a second prediction algorithm. Further, the apparatus may determine a first rate of the first prediction algorithm and a second rate of the second prediction algorithm based on the coding of the first source component and the second source component. The apparatus may also select the first prediction algorithm or the second prediction algorithm for a portion of a coding unit based on the first rate of the first prediction algorithm and the second rate of the second prediction algorithm.

The invention relates to the technical field of audio transmission, and discloses a USB multi-channel audio adaptive transmission method and system based on content awareness, and the method comprises the steps: carrying out the framing and fast Fourier transform of a first audio data stream, and obtaining a multi-channel content feature matrix; calculating a content complexity score and a bandwidth compression ratio according to the multi-channel content feature matrix, and generating a first channel transmission parameter configuration table according to the content complexity score and the bandwidth compression ratio; reconstructing an audio stream format descriptor and a synchronous endpoint descriptor according to the first channel transmission parameter configuration table to obtain a USB transmission configuration snapshot; and packaging the first audio data stream into a USB audio data packet, and transmitting the USB audio data packet to a Dolby decoder through a synchronization endpoint corresponding to the USB transmission configuration snapshot, and the method improves the overall quality and stability of multichannel audio transmission under the condition of limited USB bandwidth.