187results 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.

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 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 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 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.

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 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 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.