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| Number | Title | Issue Date |
| 4622537 | Predictive code conversion method capable of forcibly putting a feedback loop in an inactive state In a predictive encoder for encoding an encoder input signal into an encoder output signal and having in a feedback loop an adaptive predictive filter which comprises a plurality of taps assigned with adaptive prediction coefficients and produces a predic... | 11/11/1986 |
| 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 between a received code sequence and each of a plurality of pred... | 09/30/1986 |
| 4612532 | Data compression apparatus and method A preferred embodiment of the invention provides a system for the dynamic encoding of a stream of characters. In a preferred embodiment, the system includes an input for receiving a stream of characters, and an output for providing encoded data. The syste... | 09/16/1986 |
| 4583078 | Serial Viterbi decoder A serial Viterbi decoder in which a single set of circuits is sequentially used for all the encoder states to calculate the maximum probability path, as measured against received signals, of unencoded signal sequences to reach each encoder state. The path... | 04/15/1986 |
| 4580129 | Variable word length decoder A decoder is provided for decoding variable word length (VWL) encoded serial data in which each non-zero word comprises a start bit and an end bit of one state and a number of intervening bits of a different state, the number of such bits representing the... | 04/01/1986 |
| 4580162 | Adaptive picture image compression system An image compression system wherein the image is arranged in a block 1 of elements which are Hadamard transformed 2 and then quantized 3 into sequences. The DC component is prediction 4 into a DC error prediction term and all the sequences are then encode... | 04/01/1986 |
| 4571737 | Adaptive differential pulse code modulation decoding circuit In an APDCM decoding circuit, an adaptive inverse quantizer which forms a quantized coded signal, produces a residual signal and upper and lower limits thereof. An adaptive prediction circuit uses the residual signal to predict a quantization, which is ad... | 02/18/1986 |
| 4562425 | Differential encoder and decoder for transmitting binary data To enable binary data to be differentially encoded into symbols (waves) for transmission the data is applied in n-bit data-words to produce symbols which, when displayed in a phasor-diagram, are in three groups in three 120°-phase-sectors respectively, t... | 12/31/1985 |
| 4562423 | 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 characters by their current frequency of appearance, encoding the... | 12/31/1985 |
| 4562426 | Symbol coding apparatus In apparatus for transmitting digital symbols over a band-limited channel using a modulated carrier system by encoding the symbols into discrete signals selected by a finite state encoder from a signal alphabet comprised of subsets each corresponding to t... | 12/31/1985 |
| 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 characters by their current frequency of appearance, encoding the... | 12/24/1985 |
| 4558302 | High speed data compression and decompression apparatus and method A data compressor compresses an input stream of data character signals by storing in a string table strings of data character signals encountered in the input stream. The compressor searches the input stream to determine the longest match to a stored stri... | 12/10/1985 |
| 4553131 | Method and apparatus for encoding a binary data stream into a binary code stream In an encode method in which a binary data stream is divided into data words each of three bits. Each of the data words is encoded into a binary code word of 9 bits. In the method, a code word to be encoded is encoded in consideration of a code word prece... | 11/12/1985 |
| 4549304 | ADPCM Encoder/decoder with signalling bit insertion In an ADPCM transmission system, signalling frames of an incoming multiplexed PCM signal are identified and signalling bits extracted therefrom. During each signalling frame, an ADPCM encoder/decoder is controlled by the signalling frame signal to operate... | 10/22/1985 |
| 4546342 | Data compression method and apparatus A music data compression system is disclosed which includes an analog to digital converter for converting the analog music signal to digital sample signal form, a digital compression filter for compression filtering the digital sample signals, and an enco... | 10/08/1985 |
| 4542516 | ADPCM Encoder/decoder with zero code suppression An ADPCM encoding/decoding arrangement produces n-bit ADPCM codes which have 2n -1 possible codes, excluding the all-zeroes code. A range of error signals about zero is quantized by the encoder as a non-zero ADPCM code. In order to avoid such n... | 09/17/1985 |
| 4518950 | Digital code converter Accumulation of distortion possible from multiple digital code conversions is eliminated in an ADPCM coder that converts PCM incoming signals, e.g., μ-law PCM to linear PCM and, then, to a quantized n-bit differential PCM output signal. Elimination of di... | 05/21/1985 |
| 4494108 | Adaptive source modeling for data file compression within bounded memory A two-stage single pass adaptive modeling method and means for a finite alphabet first order MARKOV symbol source where the model is used to control an encoder on a per symbol basis thereby enabling efficient compression within a fixed preselected impleme... | 01/15/1985 |
| 4476458 | Dual threshold decoder for convolutional self-orthogonal codes The present invention relates to a decoder (10) for convolutional self-orthogonal codes which includes a multistage syndrome register (16) and is responsive to two separate threshold levels. The first threshold level, as in prior art arrangements, include... | 10/09/1984 |
| 4475227 | Adaptive prediction An improved Adaptive Predictor Circuit for use in an Adaptive Differential PCM Coding system (ADPCM) uses tap coefficient values to determine adaptation rate. The stability margin of a fourth order adaptive predictor is improved by dynamically changing th... | 10/02/1984 |
| 4464650 | Apparatus and method for compressing data signals and restoring the compressed data signals A compressor parses the input data stream into segments where each segment comprises a prefix and the next symbol in the data stream following the prefix. The prefix of a segment is the longest match with a previously parsed segment of the data stream. Th... | 08/07/1984 |
| 4464783 | Speech coding method and device for implementing the improved method This improved speech signal Block Coded PCM (BCPCM) system reduces the number of bits allocated to transmitting the scale factor, thereby releasing bits for allocation to coding samples in the associated block of samples. The scale factor (c) is calculate... | 08/07/1984 |
| 4463344 | Method and apparatus for generating a noiseless sliding block code for a (2,7) channel with rate 1/2 An algorithm and the hardware embodiment for producing a run length limited code useful in magnetic recording channels are described. The system described produces sequences which have a minimum of 2 zeros and a maximum of 7 zeros between adjacent 1's. Th... | 07/31/1984 |
| 4437087 | Adaptive differential PCM coding An ADPCM coder (100) converts a linear PCM input signal representative of PCM encoded speech or voiceband data into a quantized n-bit differential PCM output signal. Samples of the PCM input signal are delivered to a difference circuit (11) along with a s... | 03/13/1984 |
| 4410877 | Method of coding data bits on a recording medium, arrangement for putting the method into effect and recording medium having an information structure "Method of coding data bits on a recording medium, arrangement for putting the method into effect and recording medium having an information structure." The so-called Miller modulation has the disadvantage that a direct current is generated in the informa... | 10/18/1983 |
| 4394774 | Digital video compression system and methods utilizing scene adaptive coding with rate buffer feedback A digital video compression and expansion system and its methods for compressing and expanding digitalized video signals in real time at rates up to NTSC color broadcast rates are disclosed. The system compressor receives digitalized video frames divided ... | 07/19/1983 |
| 4335372 | Digital scaling apparatus Digital scaling apparatus adapted to receive a plurality of digital signals each composed of a plurality of bits which first encodes each of the digital signals in accordance with the number of left shifts possible in each signal without losing any data, ... | 06/15/1982 |
| 4319225 | Methods and apparatus for compacting digital data Apparatus is disclosed for implementing a unique data compaction technique hich is capable of significantly reducing the storage requirements for alpha-numeric data-sets. The results of a computer simulation which demonstrates the power of this technique a... | 03/09/1982 |
| 4309772 | Soft quantizer for FM radio binary digital signaling A soft quantizer for assigning numerical weights to hard quantized output bits of a binary digital detector in a digital receiver based on the noise energy level of the received baseband data. An analog signal, derived from the discriminator noise level, ... | 01/05/1982 |
| 4302775 | Digital video compression system and methods utilizing scene adaptive coding with rate buffer feedback A digital video compression system and its methods for compressing digitalized video signals in real time at rates up to NTSC color broadcast rates are disclosed. The system compressor receives digitalized video frames divided into subframes, performs in ... | 11/24/1981 |
| 4258392 | Coding method for facsimile signal A coding method for a two-level facsimile signal by the use of the two-dimensional coding principle, in which when successively coding addresses of a facsimile signal representative of the positions of information change picture elements, each having a bi... | 03/24/1981 |
| 4245257 | Transmission method and system for facsimile signal A transmission method for a facsimile signal by the use of the two-dimensional coding principle, in which when successively coding addresses of a facsimile signal representative of the positions of information change picture elements, each having a binary... | 01/13/1981 |
| 4206447 | Adaptive quantizer apparatus for differential coding of nonuniform digital signals Known adaptive differential pulse code modulation (ADPCM) coders typically convert a nonuniform input signal to a linearized representation thereof prior to processing the signal. Usually the linearized signal requires more bits than the nonuniform signal... | 06/03/1980 |
| 4133006 | Predictive encoder or decoder with selection of one of two or more prediction signals according to prediction error signal amplitudes A system carries out predictive encoding or decoding by selecting a prediction signal for a longer period among two or more prediction signals at the beginning of an autocorrelated signal to be encoded or of a prediction error signal to be decoded. At lea... | 01/02/1979 |
| 4122440 | Method and means for arithmetic string coding There is disclosed a method and means for compacting (encoding) and decompacting (decoding) binary bit strings which avoids the blocking of string elements required by Huffman coding and the ever increasing memory as is the case in simple enumerative codi... | 10/24/1978 |
| 4115815 | Facsimile signal coding method A facsimile signal coding method, in which information change picture elements are classified into two kinds of change points according to the information change directions. In case of the information change picture element having an information change fr... | 09/19/1978 |
| 4028731 | Apparatus for compression coding using cross-array correlation between two-dimensional matrices derived from two-valued digital images An apparatus is disclosed for compressing a p × q image array of two-valued (black/white) sample points. The image array points are serially applied to the apparatus in consecutive raster scan lines. In response, the apparatus simultaneously forms two ma... | 06/07/1977 |
| 4021782 | Data compaction system and apparatus A data compaction system and apparatus is disclosed which, in the preferred embodiment, includes a high speed compaction controller utilizing both read only storage and read-write storage. A compaction device according to the present invention could then ... | 05/03/1977 |
| 3937871 | Code communication A method and apparatus for code communication is disclosed in order to achieve band-width compression. Successive portions of information are derived and the next portion of information is predicted from at least one preceding portion, an error signal is ... | 02/10/1976 |
