| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 375241000 | Pulse code modulation | 24 |
| 20080240257 | Using quantization bias that accounts for relations between transform bins and quantization bins - Techniques and tools are described for using quantization bias that accounts for relations between transform bins and quantization bins. The techniques and tools can be used to compensate for mismatch between transform bin boundaries and quantization bin boundaries during quantization. For example, in some embodiments, when a video encoder quantizes the DC coefficients of DC-only blocks, the encoder compensates for mismatches between transform bin boundaries and quantization bin boundaries. In some implementations, the mismatch compensation uses an offset table that accounts for the mismatches. In other embodiments, the encoder uses adjustable thresholds to control quantization bias. | 10-02-2008 |
| 20080247470 | Unequal hierarchical communications modulation method - Hierarchical modulation preferably uses a 16-ary quadrature amplitude modulation (QAM) modulator with a convolutional encoder that combine to effectively provide unequal protection to two different segments of streaming input data, with improved power efficiency with the same bandwidth efficiency, by encoding the first segment as coded data as LSBs as the second segment remains uncoded as uncoded MSBs, with the MSBs used for QAM constellation modest reliability interquadrant demodulation and detection, and with the LSBs used for low reliability intraquadrant detection, but with the LSBs subject to convolutional encoding and decoding rendering the LSBs with high reliability detection, such that, the two segments have unequal coding and modulation for providing unequal levels of reliability detection. | 10-09-2008 |
| 20080260048 | Transcoder and Method of Transcoding Therefore - A transcoder comprises a receiver ( | 10-23-2008 |
| 20080267300 | Method for the compression of data using a run-length coding - The invention relates to a method for the compression of data comprising values to be coded, in particular grey values or prediction errors using a run-length coding. A bit sequence of a bit plane which represents at least one item of partial information of at least one value to be coded is thereby coded coherently. This method is particularly used in connection with medical image data. | 10-30-2008 |
| 20080298474 | Distributed iterative decoding for co-operative diversity - A source sends an encoded data block during a first time interval to a destination and to a relay. The source sends additional parity bits for the encoded data block during a second time interval. The relay partially decodes that encoded data block to a process-defined end point (typically only a partial decoding), such as a fixed number of decoding iterations. After partial decoding the relay forms a modified data block having corrected information bits and the parity bits of the block it received, and sends the modified data block to the destination, during the second time interval. The destination decodes to a results-defined end point the modified data block it received from the relay using the additional parity bits it received from the source. If that end-point cannot be reached, the destination may begin anew decoding the original encoded data block it received from the source. | 12-04-2008 |
| 20080304575 | Method for Compression and Expansion of Analogue Signals - In an analog signal compression method with digital compression and digital expansion of linear based or sine-based linear signals, a signal coordination point is determined in a bi-adaptive scaleable mV/step and a time/step structured plane. To accomplish this, the linear or sine-based input signal is digitized, the breaks of the digitized linear or sine-based signal are detected, and the time difference and the amplitude difference of two successive breaks of the linear or sine-based signal are determined. This permits time differences and amplitude differences of successive breaks to be value coded as a data word on the basis of adaptive scaleable time-per-step tables and voltage-per-step tables so that the time-per-step tables and the voltage-per-step tables are selected depending on the absolute value of the determined time difference and amplitude difference, thus producing compressed data. An associated expansion method for reconstructing the original analog signal is also disclosed. | 12-11-2008 |
| 20080304576 | Efficient decoding - Embodiments of a method and apparatus for decoding signals are disclosed. The method includes receiving modulated signals, generating bits representing the signals, and associated reliability of each bit. The method further includes executing a first stage of decoding the bits using a first component code, and simultaneously executing the first stage of decoding again using a second component code, and executing a second stage of decoding using the first component code. The first and second stages of decoding are used to generate the bit stream. Another method includes receiving modulated signals, generating bits representing the signals, and associated reliability of each bit. The method further includes executing a first stage of N stages for decoding the bits, the first stage using a first of M component codes, and simultaneously executing a plurality of the N stages of decoding, each of the plurality of N stages using a different one of the M component codes. The plurality of N stages of decoding are used to generate the bit stream. | 12-11-2008 |
| 20080310519 | System, Apparatus, and Method for Single-Carrier Block Transmission with Adaptive Guard Interval - The system, apparatus and method of the present invention provides a single carrier block transmission with guard interval as a means of communications over multi-path channels that enables frequency domain equalization, and therefore, has many of the advantages of OFDM, but does not have some of the drawbacks such as high PAPR and the need for high resolution ADCs. While the use of guard intervals in single carrier communications enables low complexity detection of the signal, it reduces bandwidth efficiency. The present invention improves the bandwidth efficiency by adjusting the length of the guard interval adaptively. Also, by allowing both time-domain and frequency domain equalizations, besides improving bandwidth efficiency, the inventions allows for great flexibility in receiver design. | 12-18-2008 |
| 20090016452 | BLOCKING FOR COMBINATORIAL CODING/DECODING FOR ELECTRICAL COMPUTERS AND DIGITAL DATA PROCESSING SYSTEMS - Embodiments described herein may include example embodiments of a method, article and apparatus for compressing data utilizing combinatorial coding which may be used for communicating between two or more components connected to an interconnection medium (e.g., a bus) within a single computer or digital data processing system, and/or for communication between computing platforms via a network or other interconnection medium. | 01-15-2009 |
| 20090016453 | COMBINATORIAL CODING/DECODING FOR ELECTRICAL COMPUTERS AND DIGITAL DATA PROCESSING SYSTEMS - Embodiments described herein may include example embodiments of a method, article and apparatus for compressing data utilizing combinatorial coding which may be used for communicating between two or more components connected to an interconnection medium (e.g., a bus) within a single computer or digital data processing system, and/or for communication between computing platforms via a network or other interconnection medium. | 01-15-2009 |
| 20090034634 | DIFFERENTIAL CODING WITH LOSSY EMBEDDED COMPRESSION - A coding system ( | 02-05-2009 |
| 20090052556 | FREQUENCY INTERLEAVING METHOD FOR WIDEBAND SIGNAL GENERATION - Wideband signal generation systems and methods are provided which employ frequency interleaving for generating wideband signals. A general method increases a digitally synthesized signal's bandwidth by frequency interleaving multiple digitally synthesized signal sources of narrower bandwidth. Frequency interleaving creates a continuous wideband signal by summing multiple narrower band signals that overlap in frequency. According to certain embodiments, digital signal processing (DSP) and analog mixing are used to create the multiple narrower band signals such that a high fidelity, continuous wideband signal is produced when the multiple narrower band signals are summed. | 02-26-2009 |
| 20090052557 | Data encoder system - A data encoder-decoder which generates an encoded data element which can be stored in and retrieved from a reduced space memory element. | 02-26-2009 |
| 20090175360 | TECHNIQUES FOR COMPRESSING DIFFERENTIAL SAMPLES OF BANDWIDTH-LIMITED DATA TO REDUCE BANDWIDTH AND POWER CONSUMPTION BY AN INTERFACE - Techniques and technologies are provided for compressing differential samples of bandwidth-limited data and coding the compressed differential samples to reduce bandwidth and power consumption when communicating bandwidth-limited data over a serial interface which couples one integrated circuit to another integrated circuit. | 07-09-2009 |
| 20090257513 | BIT REDUCTION IN A TRANSMITTER - A digital baseband signal for radio frequency transmission is processed prior to performing digital-to-analog conversion. The digital baseband signal is filtered. The number of bits of the digital baseband signal is reduced to minimise the size of the digital-to-analog converter. By performing some of the bit reduction before filtering, the size of the filter circuit is reduced whilst still meeting relevant performance parameters. | 10-15-2009 |
| 20090296829 | METHOD AND SYSTEM TO EXTEND A USEABLE BANDWIDTH OF A SIGNAL GENERATOR - A system to extend an operating bandwidth of a signal generator comprises a signal generator, an output port, a first transmission line extending between the signal generator and the output port, a mixer adapted to receive a first signal from the signal generator, a local oscillator adapted to provide a second signal to the mixer to beat against the first signal, a second transmission line extending from the mixer to transmit a plurality of output signals of the mixer, and one or more channels couplable between the first transmission line and the second transmission line. The one or more channels include a first coupler having a length adapted to couple one or more of the output signals within a band of frequencies from the second transmission line to the channel, a second coupler having a length adapted to couple the one or more of the output signals from the channel to the first transmission line, and a filter arranged between the first coupler and the second coupler. | 12-03-2009 |
| 20100046641 | SYSTEM AND METHOD FOR ENHANCING THE PERFORMANCE OF WIDEBAND DIGITAL RF TRANSPORT SYSTEMS - A system and method for enhancing the performance of wideband digital RF transport systems is disclosed, which enables the transport of different bandwidth segments on a plurality of wideband channels by selecting an optimal clock sample rate for each bandwidth segment to be transported. Thus, the bandwidth segments are proportionally allocated so that an optimum amount of bandwidth can be transported at the serial bit rate. As one example, a system for enhancing the performance of a wideband digital RF transport system is disclosed, which includes a transmit unit, a receive unit, and an optical transmission medium connected between the transmit unit and the receive unit. The transmit unit includes a plurality of wideband RF analog signal inputs coupled to a plurality of analog-to-digital, digital down-converter (A/D DDC) devices. Notably, the sample rate of each A/D DDC device is determined by a respective sample clock. The digitized wideband RF segments at the outputs of the A/D DDC devices are combined and converted to a frame structure, converted to serial form, and transmitted on the optical transmission medium to the receive unit. A light detector device in the receive unit detects the serial bit stream on the optical transmission medium, the serialized frames are converted back to the original frame format, and the original digitized wideband RF segments are reconstructed. Each digitized wideband RF segment is coupled to a respective D/A digital up-converter (D/A DUC) device associated with a particular wideband RF signal input on the transmit side. Notably, the output sample rate of each D/A DUC device is determined by a respective sample clock, which provides the same sample rate as that of the associated A/D DDC device in the transmit unit. The sample rate of each A/D DDC device (and associated D/A DUC device) is pre-selected so that the transmission medium can transport the optimum amount of RF bandwidth at the given serial bit rate. | 02-25-2010 |
| 20100226445 | Method and receiver for decoding digital information - In a method for decoding digital information, a bit-stream signal comprising binary information is received at a digital receiver utilizing wired communication. The received bit-stream signal is sampled for each binary value at least two different sampling points within an eye pattern associated with the related binary value in order to obtain a hard-bit value for each sampling point. A single soft-bit value for each binary value based on the hard-bit values of the relevant binary value is generated and the bit value of the binary value is determined by subjecting the soft-bit values to a soft-decision algorithm. | 09-09-2010 |
| 20110103491 | ADAPTIVE DATA RATE CONTROL - The present invention relates to a data rate controlling feedback loop ( | 05-05-2011 |
| 20110135013 | COMPRESSION OF BASEBAND SIGNALS IN BASE TRANSCEIVER SYSTEMS - A signal compression method and apparatus for a base transceiver system (BTS) in a wireless communication network provides efficient transfer of compressed signal samples over serial data links in the system. For the uplink, an RF unit of the BTS compresses baseband signal samples resulting from analog to digital conversion of a received analog signal followed by digital downconversion. The compressed signal samples are transferred over the serial data link to the baseband processor then decompressed prior to normal signal processing. For the downlink, the baseband processor compresses baseband signal samples and transfers the compressed signal samples to the RF unit. The RF unit decompresses the compressed samples prior to digital upconversion and digital to analog conversion to form an analog signal for transmission over an antenna. Compression and decompression can be incorporated into operations of conventional base stations and distributed antenna systems, including OBSAI or CPRI compliant systems. | 06-09-2011 |
| 20120008696 | COMPRESSION OF BASEBAND SIGNALS IN BASE TRANSCEIVER SYSTEM PROCESSORS - A signal compression method and apparatus for a base transceiver system (BTS) in a wireless communication network provides efficient transfer of compressed signal samples over serial data links in the system. For the uplink, an RF unit of the BTS compresses baseband signal samples resulting from analog to digital conversion of a received analog signal followed by digital downconversion. The compressed signal samples are transferred over the serial data link to the baseband processor then decompressed prior to normal signal processing. For the downlink, the baseband processor compresses baseband signal samples and transfers the compressed signal samples to the RF unit. The RF unit decompresses the compressed samples prior to digital upconversion and digital to analog conversion to form an analog signal for transmission over an antenna. Compression and decompression can be incorporated into operations of conventional base stations and distributed antenna systems, including OBSAI or CPRI compliant systems. | 01-12-2012 |
| 20120281771 | MODULATOR, FILTER, METHOD OF CONTROLLING GAIN OF FILTER, AND CODE MODULATING METHOD - A modulator being made small in size, low in costs, low in power consumption, small in heat generation and spurious signals. The modulator includes multipliers ( | 11-08-2012 |
| 20130148745 | High Bandwidth Decompression of Variable Length Encoded Data Streams - Mechanisms are provided for decoding a variable length encoded data stream. A decoder of a data processing system receives an input line of data. The input line of data is a portion of the variable length encoded data stream. The decoder determines an amount of bit spill over of the input line of data onto a next input line of data. The decoder aligns the input line of data to begin at a symbol boundary based on the determined amount of bit spill over. The decoder tokenizes the aligned input line of data to generate a set of tokens. Each token corresponds to an encoded symbol in the aligned next input line of data. The decoder generates an output word of data based on the set of tokens. The output word of data corresponds to a word of data in the original set of data. | 06-13-2013 |
| 20130243105 | ELECTROCARDIOGRAM SIGNAL COMPRESSION AND DE-COMPRESSION SYSTEM - The invention provides an electrocardiogram signal compression and de-compression system. The invention uses the sign characteristics of the coefficients of the discrete cosine transform type IV and the characteristics of quantization of spectrum to perform the differential pulse code modulation of the spectrum for preserving the high frequency characteristics of the spectrum of the discrete Fourier transform. The invention also uses the Huffman coding to increase the compression ratio. Different from the conventional compression technology, the invention uses the fact that the quantization values of the spectrum in the high frequency are almost the same to increase the compression ratio and preserve the characteristics of high frequency components of the spectrum. | 09-19-2013 |
