Paradyne Corporation

At&t Bell Laboratories

Ncr Corporation

At&t Corp.

Telogy Networks, Inc.

Summit Technology Systems, LP

A.t. & T. Paradyne

Innovation Specialists LLC

Sunrise Ip, LLC

Other

E-systems, Inc.

Lucent Technologies Inc.

US Government As Represented by the Secretary of the Army

American Telephone and Telegraph, Co.

Rembrandt Communications, LP

William Lewis Betts

Gordon F Bremer

Edward S Zuranski

Keith A Souders

Kenneth Martinez

Rafael S Martinez

Thomas Jeffrey Bingel

Stanley Bottoms

Kenneth David Ko

Kurt E Holmquist

Robert Earl Scott

Joseph Q Chapman

Burton R Saltzberg

Ed Thoenes

Ramon B Hazen

Chuck Coston

Robert T Greene

Wesley H Smith

Carol Betts

Ken Ko

Arthur Robert Calderbank

Jean-Jacques Werner

John Bedingfield

Luke J Smithwick

Robert E Scott

Thomas R Armstrong

Edward Arthur Thoenes

Robert A Day

Philip J Kyees

Bruce B Wetherell

Eran Cohen

Andrew T Weitzner

L Ray Blackman

Michael R Deakley

Chad Balka

David W Springer

Charles G Coston

Kenneth Matinez

James J DesRosiers

Cletus L Gardenhour

Joseph A Crupi

Disclosed are personal electronic devices (PEDs) having a sensory enhancement (SE) system for monitoring environmental conditions and detecting environmental events, for example but not limited to, changes in acoustic, thermal, optical, electromagnetic, chemical, dynamic, wireless, atmospheric, or biometric conditions. The detection of such events can be used to invoke a notification, an alert, a corrective action, or some other action, depending upon the implementation to the PED user or another party.

Sensory enhancement systems and methods in personal electronic devices

One embodiment comprises a transmitter precoder operating on an input signal to produce an output signal for modulation. The output signal is transmitted using a constellation with a constellation density. The transmitter precoder comprises scaler logic, precoder logic and selection logic. The scaler logic scales the input signal to maintain constant power on the input signal independent of the constellation density. The precoder logic precodes the scaled signal to produce a dither signal limited to a range of values. The range is inversely proportional to the constellation density. The selection logic is operable in two states. In the first state, the selection logic combines the scaled signal with the dither signal to produce the output signal. In the second state, the selection provides the scaled signal as the output signal.

System and method for adapting a change in constellation density while receiving a signal

Various embodiments implement distributed block coding (DBC). DBC can be used for, among other things, distributed forward error correction (DFEC) of source data in communication systems or parity backup for error correction of source data in storage systems where the source data may be corrupted by burst errors. A distributed block encoder (DBE) encodes sequential source data symbols with a plurality of sequential block encoders to produce interleaved parity codewords. The interleaved parity codewords enable decoding of error-corrected source data symbols with a distributed block decoder (DBD) that utilizes a plurality of sequential block decoders to produce the error-corrected source data symbols. A distributed register block encoder (DRBE) and a distributed register block decoder (DRBD) can each be implemented in a single block encoder and a single block decoder, respectively, by using a distributed register arrangement.

Distributed block coding (DBC)

Block modulus coding (BMC) systems implement block coding on non-binary modulus m symbols, where m is greater than 2. BMC systems can be used for, among other things, forward error correction (FEC) of source data in communication systems or parity backup for error correction of source data in storage systems where the source data is represented by non-binary symbols that may be corrupted by burst errors. The block coding is preferably performed using a distributed arrangement of block encoders or decoders. A distributed block modulus encoder (DBME) encodes sequential source data symbols of modulus m with a plurality of sequential block encoders to produce interleaved parity codewords. The codewords utilize modulus m symbols where the medium can reliably resolve m symbol states. The interleaved parity codewords enable decoding of error-corrected source data symbols of modulus m with a distributed block modulus decoder (DBMD).

Block modulus coding (BMC) systems and methods for block coding with non-binary modulus

System and method for adapting to a change in constellation density while receiving a signal

Various embodiments are configured to transform characteristics of a communication signal. One embodiment is a method comprising decreasing amplitude of a first detected portion of the communication signal so that the decreased amplitude is in close proximity to a predefined specification; and increasing amplitude of a second portion of the communication signal so that the increased amplitude is in close proximity to the predefined specification, thereby resulting in a transformed communication signal.

Subscriber line driver with equalizer

The present invention is directed to unique methods and apparatus for suppressing impulse noise in a multipoint communications environment using a linear block interleaver. One representative embodiment comprises first logic configured to arithmetically combine a time series of input symbols into a block of N-symbol combinations, and second logic configured to transmit, on a separate channel, each N-symbol combination to a receiver. The first logic is located in a transmitter of a first communications device. The time series has size N and N is greater than one, and each of the input symbols is taken from a signaling constellation.

System and method for space diversified linear block interleaving

The present invention provides methods and apparatus for transmitting a data-bearing signal and a non-data-bearing signal. One embodiment comprises communicatively coupling a data-bearing signal during a first time period and communicatively coupling a non-data-bearing signal during a second time period. The data-bearing signal has a first PSD. The non-data-bearing signal has a second PSD substantially the same as the first over a range of frequencies. The non-data-bearing signal has characteristics facilitating echo cancellation. Another embodiment comprises a line interface and a transmitter coupled to the line interface, comprising a data encoder and a periodic signal generator. The encoder is configured to produce a data-bearing signal with a first PSD. The periodic signal generator is configured to produce a non-data-bearing signal with a second PSD. The second PSD is substantially the same as the first PSD over a first range of frequencies. The non-data-bearing signal has characteristics facilitating echo cancellation.

System and method for subliminal time domain duplexing

A system and method for providing a minimum burst duration in accordance with a regional standard and/or requirement. One embodiment comprises a first interface () configured to receive data to be communicated, a memory () configured to store a value corresponding to a regional minimum duration, a processor () configured to generate a frame, configured to compare a duration of the generated frame with the regional minimum duration, configured to add at least one padding symbol to the generated frame to generate a second frame, the second frame having a duration at least equal to the regional minimum duration, and a second interface () configured to communicate the second frame onto a communication channel.

Communication system and method for minimum burst duration

A symbol timing derivation system derives receiver timing from received symbols which avoids the need for a pilot tone, thereby reducing power consumption and expanding usable bandwidth. The system is implemented by using a calculation that finds the timing phase error. The timing phase error is then averaged and controls a phase locked loop (PLL). This PLL in turn controls a voltage-controlled oscillator, which handles the modem receiver timing. A centroid calculation can be included to bias the voltage-controlled oscillator to push the equalizer coefficients back to the ideal position. The system can be implemented in either a point-to-point modem environment or a multi-point environment, for example, but not limited to, MVL or DMT. The voltage-controlled oscillator may also be implemented to control transmitter timing, so that the central office modem and the remote modem will operate more-or-less synchronously, reducing the need for large equalizer corrections at either end.

System and method for deriving symbol timing

Indirect digital subscriber line (DSL) service generally involves connecting conversion equipment that converts between DSL service delivered to a customer premises and DSL service that connects back to a data network. Indirect DSL service may be delivered on the same loop to the customer premises that also carries a native 0-4 KHz POTS interface. For larger deployments, the conversion equipment may include inverse multiplexing to combine multiple links back to the data network to support DSL service. Furthermore, the conversion equipment may include functions to digitize the POTS service. Aggregating DSL data from multiple customers and/or digitizing POTS service that may be multiplexed with the DSL data allows for significant pair gain opportunities.

Indirect DSL over loaded and unloaded loops

Growing community of inventors

St. Petersburg, FL, United States of America

William Lewis Betts