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7599348 |
Digital E8-VSB reception system and E8-VSB data demultiplexing method
An enhanced 8-VSB reception system and E8-VSB data demultiplexing method, by which an E8-VSB signal can be stably received as well as a previous ATSC 8VSB signal, is disclosed. Herein, the enhanced...
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7522668 |
Radio communication system and radio transmitter
Radio communication system includes radio transmitter including adding unit adding parity bit for error detection to data, spreading unit spreading, in time-and-frequency direction, data with...
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7474702 |
Digital television system
Disclosed is a digital television system carrying out modulation/demodulation by VSB(vestigial side band). A VSB transmitter includes an additional error correction encoder designed in a manner...
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7453855 |
Multiuser detection and interference suppression techniques for direct sequence spread spectrum systems in which all users employ same spreading code
The present invention considers a direct sequence spread spectrum system wherein every user employs the same spreading code. In a preferred embodiment, received signal is correlated with the...
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7391813 |
Digital wireless communications device
A digital wireless communications device enabling call distance to be increased while avoiding mute processing as far as possible, even if code error occurs in an ADPCM code. The digital wireless...
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7362811 |
Audio enhancement communication techniques
A communication system ( 10 ) receives a communication signal comprising first and second data with different compression levels, such as highly compressed and weakly compressed levels. A mode...
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7336713 |
Method and apparatus for encoding and decoding data
A DPCM operation which can reduce the size of differential data and a method and an apparatus for encoding data using the DPCM operation are provided. A method for generating differential data...
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7330466 |
PCM-based data transmission system and method
A transmitting terminal generates a stream of a given number of PCM codes whose polarity bits are each fixed at “1”, and transmits it to a receiving terminal. Subsequently, the transmitting...
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7277490 |
Apparatus for converting PCM signal
An apparatus for converting pulse code modulation (PCM) signals in a telecommunication system between two different modulation standards. In the apparatus, a channel selector generates a channel...
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7272567 |
Scalable lossless audio codec and authoring tool
An audio codec losslessly encodes audio data into a sequence of analysis windows in a scalable bitstream. This is suitably done by separating the audio data into MSB and LSB portions and encoding...
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7215931 |
Method and apparatus for up-and-down-conversion of radio frequency (RF) signals
This patent describes a method and system which overcomes the LO-leakage problem during modulation and demodulation, common to direct conversion and similar RF transmitters and receivers. This...
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7215831 |
Video enhancement using multiple frame techniques
A system is provided for that improves video quality and resolution. The system include a processor configured with logic to estimate an image from at least one observed image to produce an...
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7020303 |
Feature-based watermarks and watermark detection strategies
Processes and apparatus for improving the state of the art for watermarking and data protection. The disclosure includes feature-based watermarks, auto- and cross-correlation techniques for...
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6993067 |
Fractional bit rate encoding in a pulse amplitude modulation communication system
Fractional bit rate encoding in a pulse amplitude modulation (PAM) communication environment allows the transmission of fractional bit rates, thus maximizing the use of signal-to-noise ratio (SNR)...
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6839381 |
Method and apparatus for coherent detection in a telecommunications system
A method of channel estimation in a Code Division Multiple Access (CDMA) transmission system that incorporates Pilot Symbol Assisted Modulation (PSAM) using an iterative coherent detection method...
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6788482 |
Method and apparatus for Viterbi detector state metric re-normalization
A method and apparatus for Viterbi detector state metric re-normalization. The method includes fabricating a Viterbi detector ( 138 ) having a predetermined number of states, wherein the Viterbi...
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6785339 |
Method and apparatus for providing speech quality based packet enhancement in packet switched networks
An apparatus ( 200 ) checks voice quality when in a vocoder bypass mode. If the voice quality level is beyond an acceptable range, the apparatus ( 200 ) ends the vocoder bypass mode and returns to...
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6745162 |
System and method for bit allocation in an audio encoder
The present invention relates to a system and method which serves as a refinement in the criteria used to improve the performance of audio signal processing systems. More specifically, the present...
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6651036 |
RMS-to-DC converter with fault detection and recovery
A circuit that provides the root-mean-square (RMS) value of an input signal and that detects and independently recovers from an output fault condition is provided. The circuit includes...
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6636575 |
Cascading PLL units for achieving rapid synchronization between digital communications systems
A clock synchronization system for synchronizing a first communications device and a second communications device to enable digital communication there between. A first device generates a first...
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6549569 |
System and method for improving conversion between A-law and U-law coding
A modem or other telephone device ( 102, 502 ) is configured to identify (or receive notification of) the companding law used by a destination modem or telephone device. The telephone device ( 102,...
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6539122 |
Adaptive wavelet coding of hyperspectral imagery
A hyperspectral image encoder ( 10 ) for compressing hyperspectral imagery includes a differential pulse code modulation (DPCM) loop ( 26 ) to perform data decorrelation in the spectral domain and...
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6539061 |
Efficient method for decompressing difference coded signals
A data processing system for the compression and decompression of data using Differential Pulse Code Modulation, and optimized for fast execution using a parallel processing DSP such as the Texas...
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6532268 |
Receiving apparatus and transmitting/receiving system
A transmitting/receiving system and a receiving apparatus wherein a plurality of information signals having mutually different frequency bands processed through predetermined modulation are...
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6529569 |
Architecture for increasing density of channel bank in digital carrier system
A double density channel bank architecture compatible with an existing D4 backplane and D4 channel units transmits or receive PCM data on the PAM bus, while simultaneously transmitting or receiving...
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6510180 |
Embedded software negotiation of PCM companding format
A method and apparatus are described for selecting a companding format of a series of pulse code modulated (PCM) data words encoded under either an A-law or μ-law companding format. The method...
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6424822 |
Communication device and method of operation
A communication device is provided having a speech encoder and a speech decoder and being able to retrieve and store voice messages in a memory. The messages are stored in the memory according to a...
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6400769 |
Central office linecard and method for mapping companded data formats
A linecard codec ( 250 ) eliminates limitations of companded code disclosed which increases data rates over a public switched telephone network. The network links a plurality of subscribers and...
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6304612 |
Transmission system having a simplified channel decoder
In a tailbiting convolutional encoder the encoder (12) is initialized with a sequence of symbols corresponding to the final symbols of a sequence to be encoded, resulting in that the begin state...
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6289020 |
ATM data controller
To prevent cell-delay-variation of ATM cells to be transmitted and to compress numeral data without increasing CPU load, an ATM data controller for controlling data exchange between a data...
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6288657 |
Encoding apparatus and method, decoding apparatus and method, and distribution media
The subtracter performs subtraction processing between a pointer outputted from the pointer register and code words candidate outputted from the code word count storing circuit, and in accordance...
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6172987 |
Switching compression routines with no loss of data
A method and apparatus to change compression methods without data loss. A real time system for converting compressing data using one of several compression methods is described. When a change in...
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6172965 |
Duplex transmission scheme
This invention relates to duplex and to half duplex transmission schemes and more particularly to the application of such schemes in TDMA and other multiple access environments. In accordance with...
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6167093 |
Method and apparatus for encoding the information, method and apparatus for decoding the information and method for information transmission
A method and apparatus for encoding input digital data by high-efficiency encoding, a method for transmitting the encoded information and a method and apparatus for reproducing and decoding the...
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6097760 |
Data communications system
A data communications system includes a standard telecommunications apparatus (1) arranged to transport analogue signals in a form of Adaptive Differential Pulse Code Modulated (ADPCM) digital...
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6052158 |
Using equalized data for filter selection in HDTV receiver
A digital television receiver includes a filter for minimizing NTSC interference with a received signal having a constant symbol rate. An equalizer has two one symbol delays for each tap. A...
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6034994 |
Method for controlling the point of time when bypass mode operation is begun, based on the format of PCM data
A method for controlling the point of time when a bypass mode operation is begun, based on the format of pulse code modulation (PCM) data. A switching unit, which is coupled between outgoing-end...
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6023294 |
Bit budget estimation method and device for variable word length encoders
The invention is a process and apparatus for estimating a bit budget in a circuit for compressing digital data, especially digitized television signals. Signals represented by N-bit coded samples,...
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6018548 |
System and method for compressing data in a communication channel utilizing time encoding
A system and methods for providing data compression of data blocks utilizing time characteristics to increase the transmission time of such data over a communication channel. The underlying...
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6018520 |
Base station apparatus and a mobile radio terminal for a radio communication system, and radio communication system, and a communicating method in a radio communication system
A base station for a radio communication system suitable for use if a radio data communication network is configured using a mobile radio terminal has a base station apparatus for a radio...
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5991340 |
Method and system for encoding and decoding data using run prediction
A data encoding method having a prediction setting process that designates a numerically superior symbol as either a "0" or a "1", and the other one is designated as a numerically inferior symbol....
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5946352 |
Method and apparatus for downmixing decoded data streams in the frequency domain prior to conversion to the time domain
A data processing device is programmed to decode and transform a stream of data representing a plurality of subband encoded channels of audio data into one or more channels of PCM encoded data for...
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5890126 |
Audio data decompression and interpolation apparatus and method
Apparatus for simultaneously decompressing and interpolating compressed audio data. The compressed audio data is stored in differential log format, meaning that the difference between each two...
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5883925 |
Pulse code modulation compression mechanism
A pulse code modulation (PCM) unit is connected to a bus in a computer system. Also, connected to the bus is a processor and memory. The PCM unit is connected to transmit and receive telephone...
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5878080 |
N-channel transmission, compatible with 2-channel transmission and 1-channel transmission
A 3-channel encoder and corresponding decoder is disclosed for encoding a 3-channel signal into a transmission signal which is backwards compatible, so that prior art one channel decoders are...
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5818877 |
Method for reducing storage requirements for grouped data values
A method generates a reduced number of values representing a sequence of grouped data values and partitions the reduced number of values by first mapping data values into groups of symbols and then...
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5784006 |
Annunciator system with mobile receivers
A system for annunciating traffic information includes a plurality of stationary transmitters (42,46) for generating relatively short range, highly directional beam signals (44,48) containing a...
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5764698 |
Method and apparatus for efficient compression of high quality digital audio
A method and system for efficiently compressing a digital audio signal, wherein the digital audio signal includes a plurality of samples. Each of the samples are separated into a plurality of...
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5699479 |
Tonality for perceptual audio compression based on loudness uncertainty
A new technique for the determination of the masking effect of an audio signal is employed to provide transparent compression of an audio signal at greatly reduced bit rates. The new technique...
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5684922 |
Encoding and decoding apparatus causing no deterioration of sound quality even when sine-wave signal is encoded
There is provided an encoding and decoding apparatus which can provide a high quality of reproduction of sound. There are provided an encoding section and a decoding section. A block length...
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