Bing Jian Chen

Author:

Bing Chen

ISBN #:

3631431171

US Patent:

7050400, May 23, 2006

Filed:

Mar 7, 2001

Appl. No.:

09/801481

Inventors:

Bing Chen - Westfield NJ, US
David Beaumont Ramsden - Wall NJ, US

Assignee:

AT&T Corp. - New York NY

International Classification:

H04L 12/26

US Classification:

370250, 370473, 379 2703

Abstract:

A method is described for detecting total end-to-end loss of data packets in a packet network that does not require direct access to the packet network. A test signal is generated at a source end point indirectly coupled to the packet network. The test signal is transmitted over the packet network to a destination end point also indirectly coupled to the packet network. At the destination end point a modified test signal is received and examined to detect irregularities and then processed to determine whether the irregularities in the recorded signal represent packet loss.

US Patent:

7251213, Jul 31, 2007

Filed:

Sep 17, 2002

Appl. No.:

10/245769

Inventors:

Bing Chen - Westfield NJ, US

Assignee:

AT&T Corp. - New York NY

International Classification:

H04J 1/12

US Classification:

370201, 37940601

Abstract:

A method of measuring echo path delay in a circuit having echo cancellers after enabling an echo signal to pass through the echo cancellers. The known time for a given echo canceller to disable is subtracted from the overall test signal duration. This quantity can be subtracted from the overall echo duration to compute the echo path delay.

US Patent:

7602732, Oct 13, 2009

Filed:

Sep 27, 2005

Appl. No.:

11/236445

Inventors:

Bing Chen - Westfield NJ, US
David Beaumont Ramsden - Wall NJ, US

Assignee:

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

International Classification:

H04L 1/00

US Classification:

370252, 370242, 370248, 370473, 379 2703

Abstract:

A method is described for detecting total end-to-end loss of data packets in a packet network that does not require direct access to the packet network. A test signal is generated at a source end point indirectly coupled to the packet network. The test signal is transmitted over the packet network to a destination end point also indirectly coupled to the packet network. At the destination end point a modified test signal is received and examined to detect irregularities and then processed to determine whether the irregularities in the recorded signal represent packet loss.

US Patent:

7636436, Dec 22, 2009

Filed:

Dec 17, 2003

Appl. No.:

10/740102

Inventors:

Bing Chen - Westfield NJ, US
James H. James - Farmingdale NJ, US

Assignee:

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

International Classification:

H04M 9/08

US Classification:

3794061

Abstract:

A method for the performance testing of an echo canceller including the steps of transmitting a test signal to the echo canceller, recording an echo energy signal output from the echo canceller as a result of the test signal, measuring the energy and duration of the echo energy signal and calculating a performance score for the echo canceller based on the measured energy and duration of the echo energy signal, wherein the test signal transmitted to the echo canceller has a plurality of discrete frequency band segments of white noise representing sub-bands of an overall bandwidth ranging from about 0 kHz to about 3. 5 kHz. The test signal preferably has four discrete frequency band segments of white noise, wherein each discrete frequency band segment of the test signal is repeated in succession, whereby the test signal has a total of eight segments. Thus, the test signal can have a first frequency band segment having a bandwidth of about 0 kHz to about 1 kHz, a second frequency band segment having a bandwidth of about 1 kHz to about 2 kHz, a third frequency band segment having a bandwidth of about 2 kHz to about 3 kHz and a fourth frequency band segment having a bandwidth of about 3 kHz to about 3. 5 kHz.

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:

7917356, Mar 29, 2011

Filed:

Sep 16, 2004

Appl. No.:

10/942518

Inventors:

Bing Chen - Westfield NJ, US
James H. James - Farmingdale NJ, US

Assignee:

AT&T Corporation - New York NY

International Classification:

G10L 11/06

US Classification:

704214, 704208, 704210, 704215, 704226, 704233

Abstract:

A VAD/SS system is connected to a channel of a transmission pipe. The channel provides a pathway for the transmission of energy. A method for operating a VAD/SS system includes detecting the energy on the channel, and activating or suppressing activation of the VAD/SS system depending upon the nature of the energy detected on the channel.

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:

8346543, Jan 1, 2013

Filed:

Mar 17, 2011

Appl. No.:

13/050022

Inventors:

Bing Chen - Westfield NJ, US
James H. James - Farmingdale NJ, US

Assignee:

AT&T Intellectual Property II, L.P. - Atlanta GA

International Classification:

G10L 11/06

US Classification:

704214, 704208, 704210, 704215, 704233

Abstract:

A VAD/SS system is connected to a channel of a transmission pipe. The channel provides a pathway for the transmission of energy. A method for operating a VAD/SS system includes detecting the energy on the channel, and activating or suppressing activation of the VAD/SS system depending upon the nature of the energy detected on the channel.