Matches 351 - 395 out of 395 < 1 2 3 4 5 6 7 8


Match Document Document Title
5210536 Data compression/coding method and device for implementing said method  
A device for adaptively encoding a flow of data symbols x1, x2, . . . , xt taken within a predefined symbol family, into a compressed bit string c(s), said method including so-called modelling...
5162797 VITERBI decoder  
The inventive VITERBI decoder employs a memory for delivering a new path-metric and path selecting information. The memory stores path-metrics and path selecting information corresponding to all...
5142283 Arithmetic compression coding using interpolation for ambiguous symbols  
A method for substituting interpolated values for ambiguous symbols in an arithmetically encoded symbol string, symbols in the unencoded original string being drawn from a Markov source and a...
5109226 Parallel processors sequentially encoding/decoding compaction maintaining format compatibility  
Format compatibility between arithmetic binary compression coding devices used in a magnetic tape drive can be retained even though different numbers of compression/decompression devices are...
5062152 PCM signal coding  
A signal having a non-uniform probability density is processed for transmission in pulse code modulated form. The signal is quantized using conventional methods and the quantized signal is then...
5034741 Variable length bit patterns for data representation  
Representational efficiency is realized by employing a set (6) of variable length bit patterns (7-14) having a first and last bit equal to a particular binary value and havin only singularly...
5025258 Adaptive probability estimator for entropy encoding/decoding  
In entropy, e.g. arithmetic, encoding and decoding, probability estimates are needed of symbols to be encoded and subsequently decoded. More accurate probability estimates are obtained by...
5023611 Entropy encoder/decoder including a context extractor  
In entropy, e.g., arithmetic or adaptive Huffman, encoding/decoding a context based on prior symbols is needed to provide accurate predictions of symbols to be encoded/decoded. Encoding/decoding...
4996530 Statistically based continuous autocalibration method and apparatus  
Errors in a sampled data process are discerned statistically throughout the process, permitting their efficient removal. An exemplary application is a subranging analog-to-digital converter (ADC),...
4989000 Data string compression using arithmetic encoding with simplified probability subinterval estimation  
An improved method of generating a compressed representation of a source data string, each symbol of which is taken from a finite set of m+1 symbols, ao to am. The method is based on an arithmetic...
4973961 Method and apparatus for carry-over control in arithmetic entropy coding  
In order to employ an output register having a finite number of stages in an arithmetic encoder, it is necessary to provide carryover control, otherwise a register having an impractically large...
4968985 Data demodulation system  
A data demodulator assigns a binary value to the signal recorded in a transition cell based on the amplitude of the signal in the transition cell, the amplitudes of the signal in adjacent...
4967196 Apparatus for decoding variable-length encoded data  
Digital image data is encoded using a variable-length code which is described by a group of parameter values. Each parameter value describes a set of code values; each code value corresponds to a...
4918446 Decoder with reduced synchronization capture time  
A decoder is capable of decoding on a maximum likelihood basis coded symbols of requivalently high coding rate which are produced by deleting those code bits which are located at particular...
4899149 Method of and apparatus for decoding Huffman or variable-length coees  
Novel decoding method and apparatus are disclosed for Huffman or variable-length codes. According to the invention, variable-length code-words are divided into two parts, a variable-length prefix...
4896353 Apparatus for fast decoding of a non-linear code  
The present invention provides a high-speed decoder for decoding signals encoded into Nordstrom-Robinson 16,256,6 non-linear code. The novel decoder receives a transmitted encoded signal in the...
4891643 Arithmetic coding data compression/de-compression by selectively employed, diverse arithmetic coding encoders and decoders  
A data compression/de-compression system includes a first arithmetic coding encoder, characterized by a first set of encoding conventions, which encoder generates a code stream that points to an...
4870662 System and method for compressing transmitted or stored data  
Disclosed is a system and method for compressing data that ranks received data characters according to their frequency of occurrence in the preceding data stream. Each time a character is input to...
4862167 Adaptive data compression method and apparatus  
A method and apparatus for compressing data, particularly useful in a modem. The preferred method is implemented in a microprocessor within a modem, and dynamically adapts to changing data...
4813056 Modified statistical coding of digital signals  
A ROM includes a single dictionary of variable length codewords wherein Huffman codewords are assigned all members of the dictionary set, including one key codeword being assigned as a prefix...
4689606 Data encoding/decoding circuit  
In a data encoding/decoding circuit, a data encoding circuit includes a first clock, a first time setting circuit, a first random number generator, and a converter for receiving transmission data...
4630032 Apparatus for decoding error-correcting codes  
An improvement to a Viterbi-type decoder for decoding convolutional error-correcting codes whereby decisions regarding which predecessor state to a given state most probably corresponds to the best...
4626829 Data compression using run length encoding and statistical encoding  
A compression device which uses both run length encoding and statistical encoding. The run length encoding scheme uses a flag byte symbol which is disposed between a character signal and a run...
4614933 Viterbi decoder with the pipeline processing function  
A Viterbi decoder with a pipeline processing function for decoding a received code sequence transferred from an encoder, including correlation determining circuit for calculating correlation...
4578704 Image coding technique  
In a first embodiment, an image signal is segmented into bilevel and multilevel regions. The picture elements, or pels, representing the bilevel regions are center-thresholded and encoded using a...
4563671 Coding technique  
In a transmitter for image signals, a variable-length coder whose code set has been optimized for the order statistics of a run-length-coded bilevel image is used to code a stream of...
4560976 Data compression  
A stream of source characters, which occur with varying relative frequencies, is encoded into a compressed stream of codewords, each having one, two or three subwords, by ranking the source...
4516246 Data compression system  
A character base input data stream is encoded in compressed form by using a histogram of a sample of the data stream to determine the frequency of appearance of characters in the stream. A code for...
4467317 High-speed arithmetic compression coding using concurrent value updating  
A method and apparatus for recursively generating an arithmetically compressed binary number stream responsive to the binary string from conditional sources. Throughput is increased by reducing the...
4463342 Method and means for carry-over control in the high order to low order pairwise combining of digits of a decodable set of relatively shifted finite number strings  
Carry-over control in strings resulting from the high to low order combining of two binary number strings is obtained through the insertion of a control character within the resultant string after...
4420771 Technique for encoding multi-level signals  
A series of words each representing one of at least M (M≥3) different values is encoded by grouping the words into alternate runs of (1) a first, frequently occurring value, and (2) all other v...
4355306 Dynamic stack data compression and decompression system  
A system for encoding images by assigning variable-length code words to fixed positions in a dynamic stack. Each position in the dynamic stack is occupied by a representation of an encodable image...
4348659 Method and apparatus for encoding a digital signal to have minimal DC component  
An analog signal is quantized over a range of quantizing levels, each level being associated with a digital signal, and wherein the digital signals which are associated with a predetermined band of...
4286256 Method and means for arithmetic coding utilizing a reduced number of operations  
A method and means of arithmetic coding of conditional binary sources permitting instantaneous decoding and minimizing the number of encoding operations per iteration. A single shift and subtract...
4192010 Data reduction system  
A data reduction apparatus and method are disclosed in which a serial bit stream, as for example representing characters of a message, can be formatted, registered, transmitted and reconstructed...
4168513 Regenerative decoding of binary data using minimum redundancy codes  
Encoding and decoding between fixed and variable length binary codes to achieve data compression and decompression is performed without the necessity for storing the entire variable length minimum...
4152582 Compaction/expansion logic  
A system of encoding a fixed-level character format for transmission in a format of variable or multi-level character lengths is disclosed. A fixed-level character format, e.g., an 8-bit character...
4060834 Processor for increasing the run-length of digital signals  
A facsimile scene typically includes a plurality of lines, each line having a plurality of picture elements (pels). Often, pel signals are adaptable for run-length coding, a run being one or more...
4038652 Digital communications line terminal compacter/expander  
A system of encoding a fixed-level character format for transmission in a format of variable or multi-level character lengths is disclosed. A fixed-level character format, e.g., an 8-bit character...
3701108 CODE PROCESSOR FOR VARIABLE-LENGTH DEPENDENT CODES  
A processor for encoding fixed-length code words into variable-length code words and for decoding variable-length code words into fixed-length code words. The fixed-length code words are assigned...
3678389 METHOD AND MEANS FOR MINIMIZING THE SUBJECTIVE EFFECT OF BIT ERRORS ON PCM-ENCODED VOICE COMMUNICATION  
This disclosure concerns a method and a means for minimizing the subjective effect of bit errors on PCM-encoded voice communication. The input signal is assumed to be Laplace distributed with the...
3675212 DATA COMPACTION USING VARIABLE-LENGTH CODING  
A three-state associative memory is employed as an encoding-decoding instrumentality for making conversions between fixed-length codes and variable-length codes. During the encoding process,...
3510576 DATA SAMPLER CIRCUIT FOR DETERMINING INFORMATION RUN LENGTHS  
3471639 SHIFT/COUNT CONTROL CIRCUIT  
3156768 Variable length code method and system  
Matches 351 - 395 out of 395 < 1 2 3 4 5 6 7 8