Bing Feng Chen

US Patent:

7738643, Jun 15, 2010

Filed:

Jun 29, 2006

Appl. No.:

11/478043

Inventors:

Laurie Garrison - Oceanport NJ, US
Bing Chen - Westfield NJ, US
John Francis - Brooklyn NY, US
Diane Nawrocki - Tinton Falls NJ, US
David Nemec - Tinton Falls NJ, US

Assignee:

AT&T Corp. - New York NY

International Classification:

H04M 3/42

US Classification:

37920301, 37940601

Abstract:

This is a method for use in a teleconference that troubleshoots echo problems. After receiving a code to begin the troubleshooting process, all legs of the teleconference are muted except a test leg. That test leg is evaluated for echo. The process is repeated for each of the legs of the teleconference. After automatically measuring echo on all legs, results are reported to a moderator or host, who can take action such as muting all legs with echo, or discussing remedial action with each participant on a leg with echo.

US Patent:

8089992, Jan 3, 2012

Filed:

Sep 30, 2009

Appl. No.:

12/571109

Inventors:

Bing Chen - Middletown NJ, US
David Ramsden - Wall NJ, US

Assignee:

AT&T Intellectual Property I, L.P. - Reno NV

International Classification:

H04J 3/06

US Classification:

370516, 370412, 370252

Abstract:

Systems and methods to measure the performance of a de-jitter buffer are disclosed. In a described example, a method to measure adaptive de-jitter buffer performance includes transmitting a known audio signal via a plurality of packets over a packet-based network, recording a received signal based on the known audio signal, and analyzing the recorded signal to determine one or more of a lower de-jitter buffer size, an upper de-jitter buffer size, a de-jitter buffer expansion speed, or a de-jitter buffer contraction speed based on the recorded signal and the known signal. The example method further includes comparing the one or more of the lower de-jitter buffer size, the upper de-jitter buffer size, the expansion speed, or the contraction speed to a performance requirement, and correcting communication network performance based on the comparison.

US Patent:

20120076030, Mar 29, 2012

Filed:

Nov 30, 2011

Appl. No.:

13/308084

Inventors:

Bing Chen - Middletown NJ, US
David Ramsden - Wall NJ, US

International Classification:

H04L 12/26

US Classification:

370252

Abstract:

Systems and methods to measure the performance of a de-jitter buffer are disclosed. An example method includes transmitting a known audio signal via a plurality of packets over a packet-based network, recording a received signal based on the known audio signal, analyzing the recorded signal to determine one or more of a lower size, an upper size, an expansion speed, or a contraction speed of a de-jitter buffer based on the recorded signal and the known signal, comparing the one or more of the lower size, the upper size, the expansion speed, or the contraction speed to a performance requirement, and correcting communication network performance based on the comparison. Determining the expansion speed includes filling a lower portion of the de-jitter buffer, adding jitter to the plurality of packets, the jitter increasing at a first rate, and identifying the expansion speed as the first rate if no packet loss occurs.

US Patent:

6674738, Jan 6, 2004

Filed:

Sep 17, 2001

Appl. No.:

09/954389

Inventors:

Kazim Orhan Yildiz - Wayne NJ
Bing Chen - San Jose CA

Assignee:

Networks Associates Technology, Inc. - Santa Clara CA

International Classification:

H04L 1228

US Classification:

370338, 370474

Abstract:

A method and apparatus for detecting and diagnosing wireless network failures, provides for capturing, analyzing, and displaying detailed information relative to data packets and/or frames transmitted across a wireless network including an IEEE 802. 11 LAN.

US Patent:

20210003542, Jan 7, 2021

Filed:

Jun 30, 2020

Appl. No.:

16/916287

Inventors:

- Morris Plains NJ, US
Tengfei ZHANG - Morris Plains NJ, US
Bing CHEN - Morris Plains NJ, US
Feng LIANG - Morris Plains NJ, US

International Classification:

G01N 33/00
G01N 27/66

Abstract:

Methods and systems for detecting and limiting the water in a photoionization detector are provided. The method may include powering off a lamp configured to ionize particles of air. The method may also include monitoring a signal from the photoionization detector. The signal may be monitored based on a current between a signal electrode and a bias electrode. In an instance the signal is above a signal threshold, the method may also include electrolyzing one or more particles of water present in the photoionization detector by closing a leakage switch in order to allow current to flow through the bias electrode and the signal electrode. In an instance the signal is below the signal threshold, the method may include powering on the lamp to begin photoionization detection. Corresponding systems are also provided.

US Patent:

20200373147, Nov 26, 2020

Filed:

May 22, 2020

Appl. No.:

16/881712

Inventors:

- Morris Plains NJ, US
Tengfei ZHANG - Morris Plains NJ, US
Bing CHEN - Morris Plains NJ, US
Feng LIANG - Morris Plains NJ, US

International Classification:

H01J 61/56
G01N 33/00

Abstract:

Methods, apparatuses, and systems for providing an alternating current (AC) voltage supply for a photoionization detector lamp from a direct current (DC) voltage source are provided. An example apparatus may include a DC voltage to DC voltage (DC/DC) converter circuitry, and a feedback circuitry that is electronically coupled to the DC/DC converter circuitry and converts a reference AC voltage to a feedback DC voltage for the DC/DC converter circuitry. In some examples, the feedback circuitry may be electronically coupled to a DC voltage to AC voltage (DC/AC) converting circuitry to obtain the reference AC voltage.

US Patent:

20200333292, Oct 22, 2020

Filed:

Nov 20, 2017

Appl. No.:

16/763334

Inventors:

- Morris Plains NJ, US
Bing CHEN - Morris Plains NJ, US
Junhui ZHANG - Morris Plains NJ, US
Feng LIANG - Morris Plains NJ, US

International Classification:

G01N 27/62

Abstract:

Embodiments relate generally to systems and methods for a low profile PID typically comprising a flexible substrate; two or more electrodes containing an array of holes; a spacer with one or more holes; and two or more contacts corresponding to the electrodes. Typically, the unfolded flexible substrate defines a plane, and the electrodes are disposed on the flexible substrate such that when the flexible substrate is folded, one electrode is located on a top plane and another electrode is located on a bottom plane and the spacer is disposed between the electrodes to form an ionization chamber for use with a UV radiation source.

US Patent:

20200292496, Sep 17, 2020

Filed:

Jun 3, 2020

Appl. No.:

16/891912

Inventors:

- Morris Plains NJ, US
Zhongxing Cao - Morris Plains NJ, US
Bing Chen - Morris Plains NJ, US
Feng Liang - Morris Plains NJ, US

International Classification:

G01N 27/70
H01J 61/16
H01J 61/35
G01N 27/64

Abstract:

Embodiments relate generally to an ultraviolet lamp () for use with a photoionization detector comprising a sealed tube () configured to contain at least one gas; a coating () applied to the inner surface () of the sealed tube (); and a crystal window () attached to the sealed tube (), configured to allow transmittance of ultraviolet (UV) light generated within the sealed tube (). Additional embodiments include a method of forming an ultraviolet lamp () for use with a photoionization detector, the method comprising applying at least one layer of a coating () onto an inner surface () of a sealed tube (); sealing a crystal window () onto the sealed tube (); filling the sealed tube () with at least one gas; sealing the sealed tube () containing the at least one gas; generating ultraviolet radiation using the at least one gas within the sealed tube (); and directing the generated ultraviolet radiation through the crystal window () toward a sample gas in the photoionization detector.