1
Donald Lars Duttweiler, Barin Geoffry Haskell: Video conferencing system and method for providing enhanced interactive communication. Lucent Technologies, October 6, 1998: US05818514 (78 worldwide citation)

A system and method for enhancing interactive communication between video conferencing devices of the type in which a delay is inserted into the audio transmission path to provide lip synchronization of the image and speech of the respective users thereof. Each video conferencing device includes a d ...


2
Donald Lars Duttweiler, Allan Michael Hofmann: Quasi-pulse stuffing synchronization. Bell Telephone Laboratories Incorporated, Richard J Roddy, June 13, 1978: US04095053 (20 worldwide citation)

In a digital communication system, synchronization of a plurality of asynchronous digital signals is usually achieved by stuffing one or more pulses in a pulse stream. Thereby, stuffing equalizes the input signal bit rate with the usually fixed bit rate of a signal on a transmission link. For exampl ...


3
Donald Lars Duttweiler, David Gavin Messerschmitt: Block digital processor for use with nonuniformly encoded digital words. Bell Telephone Laboratories Incorporated, Daniel D Dubosky, March 16, 1976: US03945002 (20 worldwide citation)

A digital processor apparatus is described which operates upon nonuniformly encoded digital words each one of which has .mu.-law encoded format of a sign bit to indicate polarity, segment bits to indicate range, and interval bits to indicate the location of the sample within the segment. A predeterm ...


4
Donald Lars Duttweiler, Cheng Kim, Ying Get Tao: Echo canceler E-side speech detector. Lucent Technologies, Frederick B Luludis, September 16, 1997: US05668865 (14 worldwide citation)

The detection of echo is enhanced using a coarse near-end speech detector at a Y-side of an echo canceler and using a more accurate near-end speech detector at the E-side of the echo canceler, such that the latter detector uses a representation of far-end speech and a threshold value to determine if ...


5
Donald Lars Duttweiler, Toshiro Kawahara, Cheng Kim, Toshio Miki: Intelligent near-end speech detection. Lucent Technologies, Frederick B Luludis, May 12, 1998: US05752229 (7 worldwide citation)

The detection and cancellation of echo in a communications system is enhanced by taking advantage of the accumulated knowledge relating to the echo path delay that an adaptive filter acquires as a result of its adaptation process. Such knowledge improves significantly the ability of an associated Ne ...


6
Donald Lars Duttweiler: Digital signal processing arrangement using a cascaded integrator function generator. Bell Telephone Laboratories Incorporated, Richard J Roddy, Donnie E Snedeker, November 2, 1976: US03990073 (7 worldwide citation)

An analog-to-digital counting encoder or a digital-to-analog counting decoder for a pulse code modulation signal typically requires a function generator using precision components to generate a piecewise linear comparison signal corresponding to a segment companding law. As a result, nonproportional ...


7
Donald Lars Duttweiler: Quadrature filter augmentation of echo canceler basis functions. Lucent Technologies, November 2, 2004: US06813352 (7 worldwide citation)

An echo canceler has its otherwise conventional tapped delay line basis functions augmented with at least one pair of basis functions realizing two quadrature responses of a complex pole. The frequency of this complex pole is selected as substantially equal to the frequency of the dominant pole of a ...


8
Donald Lars Duttweiler: Adaptive filter. Lucent Technologies, Jeffery J Brosemer, September 14, 1999: US05951626 (6 worldwide citation)

An adaptive filter and method that proportionately adjusts individual tap gain distributors such that the individually adjusted tap gains are not necessarily equal to one another and that the average of tap gains remains substantially constant. The filter employs a proportionate normalized least-mea ...


9
Nuri Ruhi Dagedeviren, Lynn Emery Ditty, Donald Lars Duttweiler, Gerard Joseph Pepenella, Dewayne Alan Spires: Data optimized codec. Lucent Technologies, Howard R Popper, March 12, 2002: US06356593 (3 worldwide citation)

Quantization noise, introduced into data transmission when analog signals are translated into PCM code using the logarithmic conversion of &mgr;-law or A-law rules necessary to accommodate the transmission of voice signals, limits the maximum attainable speed of data transmission. However, when the ...


10
Donald Lars Duttweiler, David Goodwin Shaw: Echo cancellation in the network for data applications. Lucent Technologies, September 30, 2003: US06628780 (3 worldwide citation)

A network-based CODEC (coder-decoder) includes an echo canceler. This CODEC recognizes the presence of a data call by detecting predefined signaling portions of a modem handshaking process. For each detected data call, the CODEC uses a stored channel model for performing echo cancellation during the ...



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