189results about How to "Implement decoding" patented technology

The invention discloses an active user detection and channel estimation method with adaptive overhead. Using the estimated active user set and the channel thereof, the estimation quality is evaluatedby calculating the received signal error, and the time slot overhead of the pilot frequency in the frame structure can be adaptively adjusted according to the number of active users and the channel environment in the real system, so that the service quality is ensured with the access time delay as low as possible, and super-reliable active user detection and channel estimation are realized. The method also aims at an enhanced mobile broadband scene, large-scale machine type communication and other huge-address communication scenes in a cellular network in the future. According to the method, the pilot signal for broadband uplink unlicensed multiple access is reasonably designed by utilizing the sporadic characteristic of the uplink transmission flow of the user and the sparsity of a large-scale MIMO virtual angle domain channel, and an advanced compressed sensing technology is introduced, so that the access delay of the user can be greatly reduced.

The embodiment of the invention provides a streaming media decoding method and a device, wherein the streaming media decoding method is applied to a browser. The method comprises the following steps:audio and video data of a Flash video FLV format are unpacked to obtain data to be decoded; the data to be decoded comprises separated audio data and video data; the audio data and the video data areseparated from each other. Judging whether the browser satisfies preset conditions, wherein the preset conditions include: the browser does not support an extended application program interface (MSE)API of a media source; when the preset condition is satisfied, the audio data and the video data are respectively decoded by software.

The invention discloses a coal mining working face communication system based on visible light communication and a method thereof, and belongs to coal mining communication systems and methods. Pre-existing lighting cables on a working face serve as transmission media, visible light base stations based on light-emitting diode (LED) lighting lights are additionally arranged on the working face, miners wear LED mining lights which have the function of sending and receiving a message, and the LED mining lights serve as mobile nodes and can be nearby accessed to a visible light base station of a strongest signal. Wireless links among the mobile nodes of the working face and the lighting light base stations are constructed, wired links among the lighting light base stations, comprehensive protection devices and an underground backbone network are constructed, and wired and wireless mixed coverage of the working face is achieved. Spot communication data of the working face are transmitted to an underground backbone looped network switchboard or a branch switchboard through a visible light channel and the lighting cables, and the data are transmitted to a ground communication server through a backbone looped network. The coal mining working face communication system and the method thereof have the advantages that the energy consumption of an LED light source is low, transmission speed is high, the energy consumption of the system is low, safety is high, cost is low, anti-jamming capability is strong, disturbance of natural light does not exist under a coal well, and the system and the method are suitable for being used under the coal well.

This invention disclosesa low-density parity-check application LDPC in the transmitter and receiver for data transmission. The transmitter will first make information transmission LDPC code, and the bits of information and the first redundant bits sent to the receiver. Information referred to the receiver to receive data and the corresponding bit redundant bits, LDPC decoder and request when it is failed. The transmitter receiving data Retransmission request, and will do LDPC coding to the information bits after it drilled them .Then it will send the left bits to receiver. The receiver will drill the received data in the same way as before, and then will do LDPC decoding to the second left bits, then to getthe bits of information are not drilling, and then use the bits of information have not been updated to replace the received data it will do LDPC decoding to the new data to get information bits.

The invention discloses a method and a system for optimized video decoding and playing. The method comprises the following steps of analyzing a format of a video obtained by a playing request, and generating a decoding request of the video according to the format of the video; obtaining a version of a hardware decoder of equipment where a player is located, and comparing the format of the video with a video format supported by the version of the hardware decoder; when the version of the hardware decoder supports decoding of the video, calling the hardware decoder to decode video data according to the decoding request of the video and playing the video data; when the version of the hardware decoder does not support decoding of the video in the format, calling a software decoder to decode the video data according to the decoding request of the video and playing the video data; when the version of the hardware decoder supports decoding of the video, detecting a hardware decoding occupancy rate of the hardware decoder and a software decoding occupancy rate of the software decoder; and when a difference between the hardware decoding occupancy rate and the software decoding occupancy rate is greater than or equal to a predetermined threshold, calling the software decoder to decode the video data according to the decoding request of the video and playing the video data. According to the method and the system, the decoding efficiency of the video is improved.

The invention provides a TCP long connection communication system and method. The system comprises a TCP communication module, a message and data management module, an information data storage module, a distributed memory cache module and a load shunt module, wherein the TCP communication module is used for receiving data requests sent by terminal equipment, calling corresponding service logical processing interfaces in a service logical processing module according to request information, receiving operation results returned by the message and data management module and sending TCP communication data and instructions or control grammars to the terminal equipment; the message and data management module is used for calling the service logical processing interfaces to conduct management and operation on messages and data; the information data storage module is used for managing equipment information and communication system service data; the distributed memory cache module is an open source distributed memory cache system; the load shunt module is used for dynamically distributing current requests to a server with the current minimum load when receiving new TCP connection requests. The abstract, event-driven and asynchronous TCP long connection communication system and method are based on transport protocols can achieve high concurrency, high real-time performance and dynamic expansion.

The invention provides a video session terminal, a video session system and a video session method. The video session terminal is characterized by comprising a central control module, and an audio / video input module, an audio / video output module, a multi-channel audio / video coding / decoding server, a parameter configuration module and a network interface module which are connected with the central control module respectively, wherein the central control module is used for controlling the operation of each module connected with the central control module. The multi-channel audio / video coding / decoding server of the video session terminal can code a multi-channel audio / video signal and decode a multi-channel audio / video code stream. The multi-channel audio / video coding / decoding server can process the multi-channel audio / video signal, so the video session terminal can realize a one-to-many video session. The video session terminal is provided with the central control module, so the video session terminal can directly interact with other video session terminals through a network and can directly acquire audio / video code stream of the conventional monitoring equipment through the network.

The invention relates to a parallel frame synchronous scrambling device, comprising a control unit, a memory unit and an XOR unit, wherein, the control unit is used for reading pseudo-random sequences in the memory unit in sequence and obtaining contents which correspond to parallel data in the pseudo-random sequences, the memory unit is used for storing the pre-set pseudo-random sequences and inputting the contents which correspond to the parallel data in the pseudo-random sequences into the XOR unit, and the XOR unit is used for sequentially carrying out the XOR treatment on the serially input parallel data with the contents which are obtained from the memory unit and correspond to the parallel data in the pseudo-random sequences and then outputting the scrambled data. The invention also relates to a parallel frame synchronous descrambling device, the XOR unit in the device is used for sequentially carrying out the XOR treatment on the serially input scrambled data with the contentswhich correspond to the scrambled data in the pseudo-random sequences and then outputting the obtained parallel data after the descrambling. The use of the scrambling device and the descrambling device thereof can respectively realize the scrambling and the descrambling and reduce the computational complexity.

The invention discloses a multimedia playing method and a playing terminal, wherein the playing method comprises: multimedia data is read in a cache memory in segments, the multimedia data in the segmental cache memory is decoded in frames, and the decoded data is played; when decoding proceeds to the end of the current data segment, if the data block at the end is less than one frame, the data block is kept and combined with the header of the next data segment into a combined data block; and pre-analysis is performed to determine whether the combined data block is in a same frame, the combined data is decoded if yes, or discarded if not. The playing method and the playing terminal combine the end data less than one frame at the end of the prior segment with the header data of the next segment, thereby being capable of avoiding the risk of the direct discard of the end data block caused by the segment division, decreasing interrupted playing as possible, and improving the experience of customers.

The invention discloses a video decoding method, a video decoder and a video monitoring system. The video decoding method comprises the following steps: judging the type and the quantity of received video streams; identifying each path of the video streams when the received video streams are a plurality of paths of standard definition video streams; decoding each path of the video streams in a parallel way; and combining the plurality of paths of decoded standard definition video images into a path of high definition video image for outputting. By using the video decoding method of the invention, one decoder can process the plurality of paths of the standard definition video streams at the same time and combine the plurality of paths of the standard definition video images into a path of the high definition video image for outputting; and high definition display equipment is sufficiently used for improving the definition of displayed video images and a video display effect on the premise of avoiding image distortion to the greatest extent.

The invention relates to decoding algorithms of rotating transformers, aims at solving a series of problems like sensitive noise, delayed output and high resource consumption of conventional methods and realizing high-accuracy angle position output of the rotating transformers and good performance, and discloses a rotating transformer conversion method and a converter based on an FPGA (field programmable gate array). The rotating transformer conversion method includes the following steps: step 1, acquiring four sine and cosine signals different in phase; step 2, averagely dividing the whole period into eight parts according to symbol and amplitude of the signals; step 3, solving absolute value of the signals acquired in step 1; step 4, acquiring a preliminary estimation value of an angle theta. The rotating transformer conversion method and the converter are mainly applied to designing and manufacturing of the rotating transformers.

The invention discloses an OMAP (open multimedia application platform) hardware decoding acceleration based embedded high-definition media player and operation method thereof. The player comprises an ARM+DSP (digital signal processor) dual heterogeneous processing chip, open-source application software is carried on the ARM+DSP dual heterogeneous processing chip, the open-source application software is an MPlayer or a GSstreamer, and hardware decoding, software decoding, frame zooming and rotating of a video format are realized. High-definition hardware decoding playing of the common video format is realized by the aid of hardware, and decoding playing of an uncommon video format is achieved by the aid of software. Screen turning is achieved by the aid of DSP according to the characteristics of a screen media system, and self-adaptive playing on a horizontal screen and a vertical screen is realized.

The invention discloses a video monitoring method and monitoring system based on Storm technology, comprising: a Storm cluster and storage nodes, the Storm cluster includes at least one topology operation module, and the topology operation module includes: a data source component Spout and several processing components Bolt, The data source component Spout is used to configure tags for video data for distributed storage, and decomposes video data into task data blocks according to the preset logical topology, and distributes them to the corresponding processing component Bolt; the processing component Bolt is used according to the logical topology The included processing rules process the received task data blocks accordingly, and output the decoded video content to the display device for display. The technical scheme of the present invention realizes video data processing based on the Storm framework, which can effectively improve the processing speed of video data to meet the real-time requirements in the field of video surveillance; in addition, the video surveillance system can support the storage and linkage of large data The processing of video data in the scene.

The present invention discloses an absolute type encoder and a decoding measurement method thereof. The decoding measurement method comprises the steps of S1 installing a circular encoder on a to-be-tested object, and driving the to-be-tested object to rotate; S2 enabling the parallel light beams emitted out by a parallel light source to irradiate to an absolute code channel, after the light beams are reflected by the absolute code channel, adopting an optical amplification system to gather the reflected light beams to enable the light beams to irradiate to an image sensor; S3 after the image sensor acquires a reached optical signal, obtaining an encoding image at a current measurement position, and sending the encoding image to an analog-to-digital converter; S4 using the analog-to-digital converter to transform the encoding image from an analog image into a digital image and then sending to a signal processing module; S5 using the signal processing module to process the encoding image and then obtain an absolute position measurement value. The absolute type encoder and the decoding measurement method thereof are simple and rapid in operation and strong in real-time performance, can decode rapidly, and can be widely used in the absolute type encoder field.

The embodiment of the invention provides a video processing method and apparatus, and relates to the technical field of video processing. The method comprises the following steps: dividing a high-resolution video into first low-resolution sub-videos of a plurality of display areas; encoding the first low-resolution sub-videos to obtain sub-video code streams; dividing each sub-video code stream into a plurality of code stream units; sorting the plurality of code stream units of the sub-video code streams to obtain a low-resolution target video stream; and sending the target video stream to a video playing device for decoding and playing. By adoption of the video processing method and apparatus, the high-resolution video can be divided into a plurality of low-resolution sub-videos to reducethe video resolution, the plurality of high-resolution videos are encoded and arranged to form the low-resolution target video stream, and the low-resolution target video stream is sent to the videoplaying device for decoding and playing so as to improve the transmission efficiency. In this way, the video playing device can decode and play the high-resolution video through a decoder of general videos.

An embedded Tibetan intelligent information processing method is characterized in that the method establishes a Tibetan intelligent information processing method based on an embedded Linux system and organically integrates the computing function and the communication function. An embedded system development board is transplanted with an ARM Linux system, the configuration of various driving programs is used for constructing a graphical user interface and the Tibetan information processing method. The embedded Tibetan intelligent information processing method adopts a QT graph development environment under Linux to construct a Tibetan information environment and achieves the embedded Tibetan intelligent information processing method through transplanting an embedded QT / E. Simultaneously, an open-source project is utilized to develop various application programs; therefore, the system not only provides the functions such as personal information management and telephone management of Tibetan information, but also achieves the network functions such as browser, E-mail and MSN Messenger, thus providing a convenient, practical and functional intelligent Tibetan information method for intelligent mobile phones, PDAs and other intelligent information terminals.

The invention relates to the technical field of communication and discloses encoding method and device, decoding method and device as well as a communication system, wherein the encoding method comprises the following steps of: distributing received high-speed service data into at least two paths of low-speed service data; respectively carrying out FEC (Forward Error Correction) encoding on each path of low-speed service data; and outputting the service data through the FEC encoding. By using the technical scheme provided by the embodiment of the invention, the FEC encoding / decoding of the high-speed service data can be carried out by using a traditional line chip.

The invention discloses a mechanical equipment health state identification method based on an embedded cycle network. The mechanical equipment health state identification method based on the embeddedcycle network comprises the following steps: firstly, obtaining a vibration signal sample of mechanical equipment and dividing the vibration signal sample into a plurality of sections of adjacent local vibration sub-signals; then extracting a time-frequency image from the sub-signals, and taking the time-frequency image as input after standardized processing; then constructing a depth residual network and training the depth residual network so as to learn various pieces of local information in the signals; and finally, embedding the trained residual network into an input layer of the cycle network by utilizing thought of migration learning, fixing a convolution part so that the convolution part does not participate in training, and re-training the embedded network by utilizing the originalsample input again so as to learn information between adjacent periods; and diagnosing the health state of the mechanical equipment by the trained embedded cycle network. According to the method, thelocal vibration characteristic and the relation between adjacent parts are modeled, the influence of noise and local interference in the signals on a classification effect is weakened, and the applicability of the network in practical engineering is improved.

The invention provides an infrared data processing method, a processing device and a decoding method to solve the problems that in the prior art, the data quantity of infrared data coded with pulse is large, and large storage space needs to be occupied. The processing method includes the steps that infrared signals are received, the pulse width value of a first data waveform in data waveforms of the infrared signals is obtained and serves as a first classification data value and is assigned to a first coded character, and the first coded character is stored in character coded data; pulse width values of other data waveforms in the infrared signals are sequentially obtained, whether the absolute value of the difference between the current pulse width value and the (p-1)th classification data value and the absolute values of the differences between the current pulse width value and previous classification data values are within a preset threshold range or not is judged, if yes, the coded character assigned by the corresponding classification data value replaces the current pulse width value and is stored, and if not, it is determined that the current pulse width value is the pth classification data value, and the pth coded character replaces the current pulse width value and is stored in the character coded data.

The embodiment of the invention discloses a method and device for generating video thumbnails. The method for generating the video thumbnails is applied to first equipment, and the first equipment is used for generating the thumbnails for videos in second equipment. The method includes the steps that video files to be processed are obtained from the second equipment; video key frames are positioned in the obtained video files to be processed; the video key frames are processed to generate the video thumbnails in a preset format. According to the technical scheme, the first equipment which is good in system openness and can support various audio and video decoding libraries is introduced to decode video files in various video formats, so that the video thumbnails of various video files are obtained.

The invention provides a reconstruction method for controlling the pulses through the rotating speed of a rotating valve. After drilling fluid pressure differential phase shift keying signals or drilling fluid pressure quadrature phase shift keying signals which are obtained from a well opening pressure sensor are subjected to signal treatment and pumping pressure interference and noise are eliminated, phase signals reflecting the carrier phase change during drilling fluid pressure differential phase shift keying modulation or phase signals reflecting the carrier phase change during drilling fluid pressure quadrature phase shift keying modulation are obtained through coherent demodulation and anti-cosine calculation, the control pulses of the rotating speed of the rotating valve are reconstructed by conducting derivative operation on the phase signals, and the reconstructed control pulses of the rotating speed of the rotating valve are not influenced by the phase error during coherent demodulation; and logical judgment is conducted on the amplitude of the constructed control pulse of the rotating speed of the rotating valve according to the data coding rule, the code element state represented by the pulses is determined, data codes are arranged according to the occurrence time sequence of the pulses, and decoding of the drilling fluid pressure differential phase shift keying signals or the drilling fluid pressure quadrature phase shift keying signals is achieved.

The invention provides a SPI bus hardware triggering and decoding method based on an oscilloscope. In SPI bus hardware decoding, triggering and decoding are both internally accomplished by a FPGA, anda FPGA decoding module obtains tag content and tag position information which can be directly supplied to software for display at each time point and stores the tag content and the tag position information in the FPGA or an external memory (during a great storage depth) in real time. By employing the above scheme, the waiting time of the oscilloscope can be reduced, triggering and decoding can berapidly and accurately realized, defects of long time consumption and poor timeliness of conventional software decoding of the SPI bus are overcome, and the decoding efficiency of the SPI bus in theoscilloscope is improved.

The invention provides a BPL long wave timing frequency adjustment receiver. An antenna unit receives BPL long wave time signals. A radio frequency signal processing unit carries out pre-filtering, amplitude amplifying, automatic gain controlling and matching on the received signals, and analog-digital conversion is carried out through an AD sampling unit. A baseband signal processing unit carries out self-adaptation trapped wave and FIR band pass filtering on the received digital signals, searches for the BPL long wave time signals, carries out heaven and earth wave recognizing and separating, carrier phase tracking, pulse period recognizing and demodulating, carries out decoding and automatic timing frequency correcting on BPL time-code data, and transmits time information, 1PPS timing signals and 10 MHz signals to a control display output unit. The BPL long wave timing frequency adjustment receiver has the advantages that digitization is achieved, the size is small, the weight is low, the function is complete, operation is easy, and expandability is achieved. Standard time information and standard frequency signals are provided for users.

The invention relates to a wireless signal decoding method, which is used for decoding an electric signal converted from a wireless signal. The wireless signal decoding method comprises the steps of: recording duration of each level of the electric signal; calculating an average value of m periods of maximum duration and an average value of n periods of minimum duration, wherein m and n are positive integers and are determined by referencing a distribution proportion value of first binary bit values to second binary bit values in data respectively; calculating judgment duration according to the first average value and the second average value; comparing the duration of each level with the judgment duration, and judging a binary bit value represented by the corresponding level according to the comparison result; and recovering data represented by the electric signal by integrating the binary bit values.

The invention is applicable to the field of image processing, and provides a structured light based three-dimensional image reconstruction method and device and a storage medium. The method comprisesthe steps of extracting main coding feature points of an inputted object coding image; constructing a topology network of the main coding feature points, and extracting all coding element images contained in the object coding image according to the topology network; locating the initial position of graphic feature points in each coding element image, and calculating auxiliary coding feature pointsof the coding element images; performing recognition on all coding element images by using a deep learning network according to the main coding feature points and the auxiliary coding feature points;matching recognized coding information corresponding to each coding element image with coding information corresponding to a prestored coding pattern according to a preset epipolar coding strategy soas to achieve decoding; and performing three-dimensional image reconstruction according to pre-obtained three-dimensional image reconstruction system calibration parameters and the matched decoding information so as to obtain a three-dimensional image of the object.

The invention discloses a Huffman decoding method. The method comprises the following steps: receiving a code word to be decoded; comparing the code word to be decoded with a code word minimum value corresponding to each code length respectively; when the code word to be decoded is smaller than the code word minimum value corresponding to any code length in each code length, determining the effective code length of the code word to be decoded; and looking up a decoded code word corresponding to the effective code length from a corresponding relation between the code length and the decoded code word according to the effective code length to realize decoding. According to the Huffman decoding method provided by the embodiment of the invention, parallel code length acquisition can be realized in combination with a field programmable gate array (FPGA), so that the canonical form Huffman decoding efficiency is increased.

The invention discloses a quantum secure direct communication method based on photon orbital angular momentum coding, comprising the following steps: constructing two unitary operators and giving two groups of complete intrinsic quantum states; when quantum secure direct communication is carried out, based on an intrinsic quantum state space, randomly preparing, by a receiving party, a group of photon sequences, and sending to a sending party; randomly choosing, by the sending party, a check photon from the photon sequences to measure Z<^>p or X<^>p and comparing a measurement basis and a measurement result by a public channel; judging whether a communication channel is secure according to an error rate of the measurement result; if the channel is secure, carrying out coding operation on the photons by the sending party; measuring the received photons by the receiving party, comparing an initial state and a final state of a photon orbital angular momentum, obtaining the coding operation carried out by the sending party and constructing coded logic bit information sent by the sending party. According to the method disclosed by the invention, by using the photon orbital angular momentum coding, the communication capacity and the spectral efficiency of the quantum secure direct communication are improved.

The invention discloses a video stream decoding method and device. The video stream decoding method includes that detecting whether the buffer region of a digital signal processor DSP is located at an unsaturated state, wherein the DSP buffer region is used for caching video frame data; if so, inserting blank frames EOS in the DSP buffer region till the DSP buffer region arrives at a saturated state; decoding the frame data in the DSP buffer region. When the DSP buffer region is located at the unsaturated state and the residual video stream in the DSP buffer region cannot be decoded instantly, the video stream decoding method is capable of inserting blank frames which do not influence the video stream playing effect in the DSP buffer region to enable the DSP buffer region to quickly arrive at the saturated state so as to decode the frame data with the residual video stream; the video stream decoding method realizes to instantly decode the residual video stream data based on keeping the subsequent playing effect of the video stream.

The invention relates to a method and device for decoding time information of a BPL (broadband over power line) receiver. The method is technically characterized by comprising the following steps of: performing 12bit A / D (analog / digital) sampling conversion on a received BPL long wave time service signal, and performing digital filtering and other preprocessing; carrying out carrier removal by using a Costas loop to acquire carrier phase modulation information of the BPL long wave time service signal; performing relevant frequency mixing on the BPL long wave time service signal which is subjected to the sampling and filtering processing; and filtering out a high frequency component by using a FIR (far infrared) low pass filter, sending data to a DSP (digital signal processor) along an I / Q branch, wherein the DSP performs phase verification, loop filtering and other processing mainly according to the data of the I / Q branch so as to control and process a carrier tracking loop. When the method for decoding the time information, provided by the invention is used for encoding the BPL long wave time service signal, the decoding error rate at a signal-to-noise ratio (SNR) of more than or equal to 5dB is more than 0.05 percent, and the timing uncertainty of a 1PPS timing signal generated by the standard time information which is acquired by decoding is less than or equal to 200ns.

The disclosed optimal Hofmann decoding method comprises: variable-length grouping all code words in Hofmann code table, generating node according to the variable-length code word fragment to form a variable-length grouping Hofmann search tree; searching the code flow to obtain the corresponding signal. This invention can reduce memory space.