18 results about "Pulse-code modulation" patented technology

A method of video encoding includes performing context modeling to determine a context model for each of a number of bins of syntax elements corresponding to residues of a region of a transform skipped block in a current picture. The number of the bins of syntax elements being context coded does not exceed a maximum number of context coded bins set for the region. The method further includes encoding, according to Block Differential Pulse Code Modulation (BDPCM), the syntax elements based on the determined context models. When the maximum number of context coded bins is reached, remaining bins of syntax elements are encoded based on a bypass model.

An image encoding / decoding method and apparatus are provided. An image decoding method according to the present disclosure may include parsing, from a bitstream, first information specifying whether block difference pulse code modulation (BDPCM) applies to an intra-predicted current block, determining a prediction direction of BDPCM for the current block and generating a residual block of the current block based on the determined prediction direction of BDPCM, based on the first information specifying that BDPCM applies to the current block, generating a prediction block of the current block, by performing intra prediction based on an intra prediction mode of the current block, and reconstructing the current block based on the residual block and the prediction block.

The application provides a video image fast clipping and dimension reduction method and system based on a hierarchical bounding box, applied to the technical field of image processing, wherein the method collects multi-view dynamic scene point cloud data, and then divides the space by using a hierarchical bounding box to establish a bounding box structure with density characteristics; subsequently, optical diffraction array pre-filtering is used, and point clouds are separated based on wavelength selectivity and density distribution to generate a first subset and a background subset; then, adaptive pulse code modulation is used on nodes in the first subset to obtain high-precision data, and nodes in the second subset are compressed into low-code-rate data by using run-length encoding; subsequently, the two types of data are input into an improved k-d tree based on the spatial relationship of the bounding box to generate a two-dimensional point set representing key features, and a spatial index is constructed to realize real-time scene retrieval. The application can realize image dimension reduction while retaining key geometric features of the image, thereby improving efficient real-time spatial retrieval in a dynamic scene.

In some aspects, an electronic device can receive multiple tactile signals associated with multiple tactile events, wherein the multiple tactile events overlap in the time domain. The electronic device can generate a hybrid tactile signal that combines the multiple tactile signals in the mechanical acceleration domain, wherein the hybrid tactile signal stores timing or synchronization information associated with the multiple tactile signals. The electronic device can generate an output stream to be provided to a tactile actuator, wherein the output stream includes a pulse code modulation (PCM) voltage signal based on the hybrid tactile signal combining the multiple tactile signals. Numerous other aspects are described.

The invention provides a PCM-based mapping table hierarchical storage and dynamic updating method and system, and the method comprises the steps: dividing a mapping table according to a logic address space when an SSD controller initializes a system, and building a DDR cache region and a PCM intermediate layer; the SSD controller establishes a popularity statistical table; entries of a high-frequency or key starting area are loaded into a DDR cache region, and full entries are stored into a PCM intermediate layer; when the host sends a read-write request to the SSD controller, the SSD controller preferentially searches the corresponding mapping entry from the DDR cache region; if the corresponding mapping entry is not found, searching the corresponding mapping entry from the PCM intermediate layer; if the mapping entry is found, loading the accessed mapping entry into a DDR cache region from a PCM intermediate layer, and updating the heat; and realizing adaptive migration between the DDR and the PCM based on the access heat item.

Methods, systems, and devices are described for implementing adaptive color transform (ACT) and block-based delta pulse code modulation (BDPCM) during image / video encoding or decoding. An example method of video processing includes, for a conversion between a current video unit of a video that is a chroma video unit and a bitstream representation of the video, determining, based on a rule, whether a block-based delta pulse code modulation (BDPCM) mode is available, and performing the conversion based on the determination, where the rule is based on whether an adaptive color transform (ACT) mode is used to code the current video unit and / or whether the BDPCM mode is used to code a luma video unit corresponding to the current video unit.

A dual-layer optical encryption fluorescent polymer waveguide chip based on optical pulse code modulation technology belongs to the field of functional photonic chip technology. It consists of a substrate layer, a buffer layer, a cladding layer, a bottom waveguide layer, and a top waveguide layer. The cladding layer is divided into three parts: a lower cladding layer, a middle cladding layer, and an upper cladding layer. The bottom waveguide is located within the middle cladding layer, and the top waveguide is located within the upper cladding layer. The bottom and top waveguides do not overlap in the chip's top-view plane. The waveguide layer material is obtained by doping fluorescent small-molecule oligomer chromophores into a polymer material. This invention achieves signal optical pulse coding by modulating the pump light power intensity. By detecting changes in optical transmission loss in the fiber optic system, it determines whether eavesdropping has occurred. Eavesdropping is indicated by optical transmission loss exceeding a threshold. False information is displayed in the bottom waveguide for disguise, while the modulated information is transmitted encrypted through the top waveguide, thus solving the problems of limited controllability and insufficient security in traditional encryption technologies.

An image decoding method performed by a decoding device according to the present document comprises the steps of: acquiring a block-based delta pulse code modulation (BDPCM) flag for a current block; on the basis of the BDPCM flag indicating that BDPCM is applied to the current block, acquiring a BDPCM direction flag for the current block; and storing, as an intra-prediction mode of the current block, an intra-prediction mode of a prediction direction derived on the basis of the BDPCM direction flag.

The application provides an audio data processing method and device for sound wave communication and a storage medium, which comprises the following steps: obtaining initial communication text to be sent, and performing encoding processing on the initial communication text to determine the encoding data corresponding to the initial communication text; the encoding data comprises at least one of check bit data and error correction code data corresponding to the initial communication text; performing frequency conversion on the encoding data to determine the frequency data corresponding to the encoding data; performing audio generation processing on the frequency data by using a pulse code modulation mode and a sine wave function to determine the audio data corresponding to the frequency data; the audio data comprises multiple syllables, and the volume change trend of each syllable from the beginning to the end is first large and then small; the audio data is sent to a receiving end device; and the audio data is used to enable the receiving end device to decode the audio data and then perform sound wave communication. The technical scheme can improve the success rate of sound wave communication.

A method of video encoding includes performing context modeling to determine a context model for each of a number of bins of syntax elements corresponding to residues of a region of a transform skipped block in a current picture. The number of the bins of syntax elements being context coded does not exceed a maximum number of context coded bins set for the region. The method further includes encoding, according to Block Differential Pulse Code Modulation (BDPCM), the syntax elements based on the determined context models. When the maximum number of context coded bins is reached, remaining bins of syntax elements are encoded based on a bypass model.

The invention provides a 5G LDPC (Low Density Parity Check Code) hierarchical scheduling decoding method. The 5G LDPC hierarchical scheduling decoding method comprises the following steps: step 1, setting and respectively representing an ith check node and a jth variable node in a PCM (Pulse Code Modulation); sums are set as messages from transmitted verification to variables and messages from transmitted variables to verification in the t-th iteration respectively; if yes, a posterior probability message of the jth coding bit in the tth iteration is represented, and a normalized minimum sum hierarchical decoding algorithm is executed; and step 2, generating a decoding updating sequence of each layer different from a natural sequence in the check matrix by adopting a hierarchical scheduling algorithm. According to the scheme, the average number of iterations of decoding is reduced while the decoding performance is improved, and the complexity of the decoding process is almost not required to be increased in the improvement.

The invention discloses a voice coding and decoding method, which comprises a receiving end and a transmitting end, and is characterized in that the transmitting end acquires voice data which is in a pulse code modulation (PCM) format, has a single channel, 16 bits and a sampling rate of 8kHz, and acquires 320 bytes per 20ms; compressing each 320 bytes of voice data into 5 bytes of compressed data; multiple groups of compressed data are assembled into data frames, every 18 groups of compressed data form one data frame, and protocol fields are added to the heads of the data frames; performing encryption and scrambling processing on the data frame; the processed data frame is sent to a satellite communication channel through a digital signal processor (DSP); a receiving end receives data frames from a satellite communication channel, and one frame is received every 60ms; splicing the plurality of data frames into a complete voice data frame; performing descrambling and decryption processing on the voice data frame; decompressing the decrypted data into 320-byte voice data by taking every 5 bytes as a group; playing the decompressed voice data; according to the invention, the voice quality is greatly improved.

An image encoding / decoding method and apparatus are provided. An image decoding method according to the present disclosure may include parsing, from a bitstream, first information specifying whether block difference pulse code modulation (BDPCM) applies to an intra-predicted current block, determining a prediction direction of BDPCM for the current block and generating a residual block of the current block based on the determined prediction direction of BDPCM, based on the first information specifying that BDPCM applies to the current block, generating a prediction block of the current block, by performing intra prediction based on an intra prediction mode of the current block, and reconstructing the current block based on the residual block and the prediction block.

The application discloses an adaptive electrocardiosignal compression method based on meta learning, comprising the following steps: obtaining a target electrocardiosignal, preprocessing the electrocardiosignal to obtain a preprocessed electrocardiosignal; inputting the preprocessed signal into a nested bottleneck self-encoder to select a compression ratio through dynamic routing; extracting the meta features of the signal segment, and selecting a compression model according to the meta features and a preset reconstruction error threshold through a meta learner; when the predicted entropy exceeds a set threshold, switching to a differential pulse code modulation and bzip2 hybrid guarantee compression mode; and using the selected model to compress and encode the electrocardiosignal. The application can adaptively select a suitable compression multiple model according to the complexity of the signal, so that better compression performance and higher compression efficiency can be realized within a given reconstruction error range.

The invention belongs to the technical field of telemetering test equipment, and particularly discloses telemetering wired PCM (pulse code modulation) data network switching equipment and a telemetering wired PCM data network switching method. The equipment comprises a PCM (Pulse Code Modulation) data receiving module, a data processing module and a network forwarding control module which are connected in sequence, the network forwarding control module is used for being connected with an external client; the PCM data receiving module is used for converting an input PCM differential level signal into a logic level signal and outputting the logic level signal to the data processing module; the data processing module is used for performing decoding and caching processing according to the logic level signal to obtain PCM data; and the network forwarding control module is used for responding to an instruction of an external client, acquiring the PCM data from the data processing module and sending the PCM data to the external client. According to the method and the device, the universality of PCM data receiving test means can be greatly improved, the execution efficiency of actual test tasks is improved, and the dependence on a traditional telemetering comprehensive test board is eliminated.

The application discloses a multi-base station cooperative communication optimization method based on reinforcement learning and belongs to the technical field of wireless communication processing; through 7-2 layer function segmentation, beamforming is sunk to a remote unit, and local beamforming weight is calculated by using global precoding auxiliary information fed back by a central unit at a previous moment, so that high-dimensional antenna signals are reduced to low-dimensional user data streams; a joint quantizer based on Wyner-Ziv distributed source coding is adopted, spatial correlation between data streams of different remote units is used for compression, and a compression codebook and a global precoding matrix are jointly designed, so that mutual information between a quantization noise covariance matrix and a user interference channel is minimized; a multi-user channel matrix is reconstructed based on compressed data streams, and a reinforcement learning intelligent agent is introduced, an adaptive cooperative precoding strategy is output through intelligent decision-making, and differential pulse code modulation and adaptive quantization are adopted to efficiently feed back the global precoding matrix.

A video decoding method performed by a decoding device according to the present document is characterized by comprising the steps of: acquiring a BDPCM availability flag regarding whether Block-based Delta Pulse Code Modulation (BDPCM) is available for a chroma block and a luminance block; acquiring a BDPCM luminance flag regarding whether BDPCM is applied to a current luminance block based on the BDPCM availability flag; and acquiring a BDPCM chroma flag regarding whether BDPCM is applied to current chroma blocks based on the BDPCM availability flag.