39 results about "Bitstream format" patented technology

A system, method, and bit-stream format thereof for delivery, scalable encoded media data is described. The scalable encoded bit-stream is formatted to have first and second portions. The first portion corresponds at least to non-media type specific scalability attributes of the original encoded media data and data structure information of a second portion and the second portion corresponds to the original scalable encoded media data arranged in a non-media type specific indexable data structure having at least one dimension. The formatted media data allows the system and method to provide seamless, flexible delivery to media destinations having a variety of receiving attributes. The media data is transcoded prior to delivery based on the receiving attributes of the media destination and non-media specific scalability attributes of the formatted scalable encoded media bit-stream.

A low-bitrate encoding system includes: a time-frequency transform unit transforming an input time-domain audio signal into a frequency-domain audio signal; a frequency component processor unit decimating frequency components in the frequency-domain audio signal; a psychoacoustic model unit modeling the received time-domain audio signal on the basis of human auditory characteristics, and calculating encoding bit allocation information; a quantizer unit quantizing the frequency-domain audio signal input from the frequency component processor unit to have a bitrate based on the encoding bit allocation information input from the psychoacoustic model unit; and a lossless encoder unit encoding the quantized audio signal losslessly, and outputting the encoded audio signal in a bitstream format. Using the low-bitrate encoding system, it is possible to effectively compress data at a low bitrate, and thus to provide a high quality audio signal.

The related speaker verification system (1) based on a distributed structure comprises: a system front end (2) to collect speech sound, extract feature, compress into the bit-flow format and send to (3); a data transmission channel (3) to communicate between (2) and (4); and a system back end (4) to decompress the data into the feature for verification. This invention improves storage level and calculation capacity, can fit the content decision request, and can avoid forgery.

Methods, systems, and products for remote direction of streaming digital content from a multiplicity of sources of digital information to a multiplicity of client devices, including receiving digital content from the sources, receiving from a remote director and storing in computer memory remote director instructions, transcoding the digital content from sources into digital content having streaming format, including in an output stream, in dependence upon the remote director's instructions, digital content having streaming format, and communicating to client devices the output stream.

The invention relates to a scalable video (de)coding method for wireless transmission of high definition television signals. Scalable means that the bitstream contains successively smaller quality refinements and that the bitstream can be truncated. The video images are divided in slices, and each slice is divided in blocks of 8×8 pixels. For each block, an optimal encoding method is chosen. Depending on whether the block is found to contain natural or synthetic image content, transform coding (DCT) or graphic coding is applied. Because the different encoding modes have different properties as regards picture quality, the bitstream format has to enable the encoder to very flexibly choose which bits to send first. The bitstream format in accordance with the invention consists of a multitude of scans (31-34) through the coded data of a series of individual blocks, e.g. a slice. In each scan, the encoder decides whether it will include data for natural blocks (BS1,BS2), for synthetic blocks (BS0,BS1), or both. For the DCT blocks, it can further choose between DC coefficient bits (22) and AC coefficient bits (23). For example, the encoder can choose to first send a few scans of DCT DC bits, then send a few scans of graphics bits and then send some DCT AC bits. The decisions that the encoder makes are signaled to the decoder in the form of flags that precede each block part (e.g. encoded bit plane) and/or plurality of blocks (e.g. a slice).

A method for stereo audio perceptual encoding of an input signal includes masking threshold estimation and bit allocation. The masking threshold estimation and bit allocation are performed once every two encoding processes. Another method for stereo audio perceptual encoding of an input signal includes performing a time-to-frequency transformation, performing a quantization, performing a bitstream formatting to produce an output stream, and performing a psychoacoustics analysis. The psychoacoustics analysis includes masking threshold estimation on a first of every two successive frames of the input signal.

The invention relates to the technical field of computer application, especially a general byte stream parsing system of big data collection and a realization method of the system. The system is composed of a byte stream pre-processor and a two-dimensional table analyzer. According to conventional automatic verification data, the byte stream preprocessor preprocesses data by selecting a corresponding decompression and decryption method automatically according to a compression and encryption manner; the two-dimensional table analyzer defines a two-dimensional table according to the byte stream format, data information is stored in rows and row groups, columns are used to mark the name, data type and length of each field, after that the byte stream of data is read in, the byte stream is segmented into multiple fields according to the bit length defined in each column, and the segmented byte stream is parsed into corresponding information according to data types; and data or set information read by the rows or multiple rows in the row group is read, and concrete field information of the data rows is read via the field name of the column. According to the invention, repeated defining, compiling and parsing are avoided, and the system and method are suitable for parsing data of complex and diversified structures in big data collection in a unified manner.

Methods and apparatuses for encoding and decoding video are disclosed. The method of encoding video includes assigning (12) a distortion versus quantization curve to a block in a picture of a video based on a perceptual metric classification of the block, determining a quantization parameter (132) for the block based on the distortion versus quantization curve and a target distortion for the block, the target distortion being an overall target distortion for the picture and encoding (16) the block based on the quantization parameter. A bitstream formatted to include encoded data, and computer-readable storage mediums and computer-readable program products for encoding and decoding video are also disclosed.

An audio encoder includes a time-frequency mapping block, a psychoacoustic model block, a middle/side (M/S) encoding block, a parameter calculation block, a bit allocation and quantization block and a bitstream formatting block. The encoder is forced to operate in M/S mode for reducing the calculation time of the parameter used for bit allocation, quantization and encoding. In addition, the calculation of the parameter only needs to consider the middle and side channels but not the left and right channels, thus the complexity of the psychoacoustic model for analyzing the input audio signal can be reduced.

An information handling system includes a processor that may perform preprocessing on a variable-length code (VLC) bitstream before decoding the bitstream. The bitstream includes multiple codewords. The processor analyzes incoming VLC bitstream information and generates codeword table information for storage in a system memory or a VLC codeword tables location. The processor generates a VLC lookup table from the information in the VLC codeword tables and stores that VLC lookup table in a system memory of the IHS. The VLC lookup table may exhibit two dimensional indexing by leading zero count and bit-length possibility.

Data is input in a streaming format, a file is generated based on the input data in a streaming format, and data is output that includes reference information referring to the generated file.