Peng Ning L Zhang

US Patent:

6580793, Jun 17, 2003

Filed:

Aug 31, 1999

Appl. No.:

09/386728

Inventors:

James Patrick Dunn - Township of Northville, LaSalle County IL
Peng Zhang - Buffalo Grove IL

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04M 908

US Classification:

37940604, 37940601, 37940608, 370352, 375345

Abstract:

An echo canceling system with self deactivation includes an echo canceller based on an adaptive filter, and an echo detector. The adaptive filter determines an estimate of an echo signal present in an untreated signal received from a ânearâ end of a communications channel. In order to produce an echo-canceled received signal, the echo canceller subtracts the estimated echo from the untreated received signal. The echo detector compares the energy of the untreated received signal and the energy of the echo-canceled received signal. The difference represents the energy in the estimated echo signal generated by the adaptive filter. If this energy is large, significant echo is present. The echo canceller remains activated, and the echo detector selects the echo-canceled received signal for output. If the estimated echo energy is small, little or no cancelable echo is present.

US Patent:

6775240, Aug 10, 2004

Filed:

Aug 29, 2000

Appl. No.:

09/650060

Inventors:

Peng Zhang - Buffalo Grove IL

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G01R 3108

US Classification:

370251, 370248, 379 2201, 379 2202, 379 2703

Abstract:

A communications quality measurement system for use with packet and other networks comprises a test signal transmitter, a test signal receiver, and a test signal analyzer. A test transmitter is used to produce a series of test signals selected or engineered for measuring one or more desired Quality of Service or other performance parameters of a network path to be tested. A first copy of the test signal is transmitted via a reference path of known characteristics and with minimal impairments. A second copy of the test signal is transmitted via the network path to be tested. A test receiver receives and records the signals which were carried via the reference and test paths. A test signal analyzer compares the signals received over the reference and test paths and analyzes differences to determine Quality of Service or other parameters, such as Bearer Delay, Cell or Packet Loss, Echo Delay, and Echo Amplitude, some of which are directed to the particular impairments that are characteristic of packet networks. The test signal is preferably injected into and received from handset analog audio paths of originating and terminating subscriber terminals, so that the effects of nearly all network components will be measured.

US Patent:

7653068, Jan 26, 2010

Filed:

Jun 9, 2004

Appl. No.:

10/864583

Inventors:

Douglas J. Botkin - Aurora IL, US
Steven L. Makowski - Naperville IL, US
Marc R. Blumberg - Berwyn IL, US
Mark G. Bradac - Batavia IL, US
Edward A. Clark - Sugar Grove IL, US
Joseph J. Kott - Aurora IL, US
Donald T. McBride - Naperville IL, US
Alan H. Matten - Chicago IL, US
Charles H. Rydholm - Naperville IL, US
Douglas W. Sturm - Wheaton IL, US
Jose A. Suarez - Naperville IL, US
Peng Zhang - Buffalo Grove IL, US

Assignee:

Alcatel-Lucent USA Inc. - Murray Hill NJ

International Classification:

H04L 12/28

US Classification:

3703952, 370230, 3702301, 37039521

Abstract:

A method and apparatus for providing call admission control in a packet network such as an internet protocol (IP) network are provided. More particularly, a terminating endpoint of a logical connection on a packet network, e. g. an IP network, is provided with the ability to make a decision on whether to accept or reject an incoming call based on quality of service (QoS) indicator based on QoS metrics. These metrics indicate quality of service levels for specific logical connections and are accumulated over specified time periods.

US Patent:

7680655, Mar 16, 2010

Filed:

May 20, 2005

Appl. No.:

11/134188

Inventors:

Ronald Jay Canniff - Naperville IL, US
Michael R. Kosek - Naperville IL, US
Alan Howard Matten - Chicago IL, US
Harvey P. Siy - Chicago IL, US
Peng Zhang - Buffalo Grove IL, US

Assignee:

Alcatel-Lucent USA Inc. - Murray Hill NJ

International Classification:

G10L 15/20

US Classification:

704233, 704214, 704221, 455423

Abstract:

A method and apparatus are provided for determining the quality of a speech transmission, including temporal clipping, delay and jitter, using a carefully constructed test signal () and digital signal processing techniques. The test signal that is to be transmitted through a speech transmission system () is created (). Then the test signal is transmitted through the speech transmission system such that the speech transmission system creates an output signal that corresponds to the input signal, as modified by the speech transmission system (). The test signal includes multiple segments () of speech signals interleaved with periods of silence. The periods of silence vary in duration according to a predefined pattern. Each segment of speech signals includes multiple predefined speech samples or symbols () interleaved with a plurality of silence gaps. The speech samples have a common period of duration, but the silence gaps do not.

US Patent:

7821940, Oct 26, 2010

Filed:

Apr 5, 2004

Appl. No.:

10/818331

Inventors:

Douglas J. Botkin - Aurora IL, US
Mark G. Bradac - Batavia IL, US
Edward A. Clark - Sugar Grove IL, US
Joseph J. Kott - Aurora IL, US
Steven L. Makowski - Naperville IL, US
Alan H. Matten - Chicago IL, US
Douglas W. Sturm - Wheaton IL, US
Peng Zhang - Buffalo Grove IL, US

Assignee:

Alcatel-Lucent USA Inc. - Murray Hill NJ

International Classification:

H04L 12/26
H04L 12/28

US Classification:

370235, 370252, 370401

Abstract:

A maintenance component of an apparatus in one example employs one or more packets that are communicated over an active packet connection to evaluate the active packet connection.

US Patent:

20020101971, Aug 1, 2002

Filed:

Jan 30, 2001

Appl. No.:

09/772832

Inventors:

Peng Zhang - Buffalo Grove IL, US
Lun He - Lisle IL, US
Bing Leng - Naperville IL, US
ZhongJin Yang - Naperville IL, US

International Classification:

H04M003/42

US Classification:

379/215010

Abstract:

The present invention provides a method, communication system, and Internet Call Waiting/Holding (ICW/H) server for providing internet call waiting service without dropping the connection between a computer and an Internet Service Provider (ISP). A computer, via a modem or the like, initiates an internet call waiting connection between the computer and the ISP via a switch. The ISP assigns a dynamic Internet Protocol (IP) address to the computer for the internet call waiting connection. The computer sends the directory number and the dynamic IP address of the computer to an Internet Call Waiting/Holding (ICW/H) server, which stores them. The ICW/H server sends a message to the switch indicating that the call waiting service is active. The switch, upon receiving an incoming call request intended for the computer while the internet call waiting connection is active, routes the incoming call request to the ICW/H server. The ICW/H server alerts the computer of the incoming call request without dropping the internet call waiting connection.

US Patent:

20060215683, Sep 28, 2006

Filed:

Jun 22, 2005

Appl. No.:

11/165562

Inventors:

Rafid Sukkar - Aurora IL, US
Richard Younce - Yorkville IL, US
Peng Zhang - Buffalo Grove IL, US

Assignee:

Tellabs Operations, Inc. - Naperville IL

International Classification:

H04J 1/16
H04L 12/26
H04J 3/16
H04Q 7/20
H04Q 7/00

US Classification:

370437000, 370252000, 370328000, 455452200

Abstract:

Voice Quality Enhancement (VQE) is performed directly in a coded domain. A Coded Domain Voice Quality Enhancement (CD-VQE) system modifies at least one parameter of a first encoded signal, resulting in corresponding modified parameter(s). The CD-VQE system replaces the parameter(s) of the first encoded signal with the modified parameter(s), resulting in a second encoded signal. In a decoded state, the second encoded signal approximates a target signal that is a function of at least the first encoded signal in at least a partially decoded state. Thus, the first encoded signal does not have to go through intermediate decode/re-encode processes, which can degrade overall speech quality. The CD-VQE system may cascade functions. Computational resources required for a complete re-encoding are not needed. Overall delay of the system is minimized. The CD-VQE system can be used in networks in which signals are communicated in a coded domain, such as a Third Generation (3G) wireless network.

US Patent:

20060217969, Sep 28, 2006

Filed:

Jun 22, 2005

Appl. No.:

11/158925

Inventors:

Rafid Sukkar - Aurora IL, US
Richard Younce - Yorkville IL, US
Peng Zhang - Buffalo Grove IL, US

Assignee:

Tellabs Operations, Inc. - Naperville IL

International Classification:

G10L 19/00

US Classification:

704219000

Abstract:

Acoustic Echo Suppression (AES) or ES is performed directly in a coded domain. A Coded Domain Acoustic Echo Suppression (CD-AES) system modifies at least one parameter of a first encoded signal, resulting in corresponding modified parameter(s). The CD-AES system replaces the parameter(s) of the first encoded signal with the modified parameter(s), resulting in a second encoded signal which, in a decoded state, approximates a target signal that is a function of two signals, including the first encoded signal and a third encoded signal, in at least partially decoded states. Thus, the first encoded signal does not have to go through intermediate decode/re-encode processes, which can degrade overall speech quality. Computational resources required for a complete re-encoding are not needed. Overall delay of the system is minimized. The CD-AES system can be used in any network in which signals are communicated in a coded domain, such as a Third Generation (3G) wireless network.