Charles Humphrey Summers

US Patent:

7050388, May 23, 2006

Filed:

Aug 5, 2004

Appl. No.:

10/911915

Inventors:

Andrew Joo Kim - Atlanta GA, US
Michael G. Vrazel - Atlanta GA, US
Sanjay Bajekal - Marietta GA, US
Charles Summers - Woodstock GA, US

Assignee:

Quellan, Inc. - Atlanta GA

International Classification:

H04L 12/26

US Classification:

370201, 370286

Abstract:

Signals propagating in one communication channel can generate crosstalk interference in another communication channel. A crosstalk cancellation device can process the signals causing the crosstalk interference and generate a crosstalk cancellation signal that can compensate for the crosstalk when applied to the channel receiving crosstalk interference. The crosstalk cancellation device can include a model of the crosstalk effect that generates a signal emulating the actual crosstalk both in form an in timing. The crosstalk cancellation device can include a controller that monitors crosstalk-compensated communication signals and adjusts the model to enhance crosstalk cancellation performance. The crosstalk cancellation device can have a mode of self configuration or calibration in which defined test signals can be transmitted on the crosstalk-generating channel and the crosstalk-receiving channel.

US Patent:

7626916, Dec 1, 2009

Filed:

Jan 19, 2006

Appl. No.:

11/334864

Inventors:

Andrew Joo Kim - Atlanta GA, US
Michael G. Vrazel - Atlanta GA, US
Sanjay Bajekal - Marietta GA, US
Charles Summers - Woodstock GA, US

Assignee:

Quellan, Inc. - Atlanta GA

International Classification:

H04L 12/26

US Classification:

370201, 370286

Abstract:

Signals propagating in one communication channel can generate crosstalk interference in another communication channel. A crosstalk cancellation device can process the signals causing the crosstalk interference and generate a crosstalk cancellation signal that can compensate for the crosstalk when applied to the channel receiving crosstalk interference. The crosstalk cancellation device can include a model of the crosstalk effect that generates a signal emulating the actual crosstalk both in form an in timing. The crosstalk cancellation device can include a controller that monitors crosstalk-compensated communication signals and adjusts the model to enhance crosstalk cancellation performance. The crosstalk cancellation device can have a mode of self configuration or calibration in which defined test signals can be transmitted on the crosstalk-generating channel and the crosstalk-receiving channel.

US Patent:

7725079, May 25, 2010

Filed:

Jun 9, 2006

Appl. No.:

11/450543

Inventors:

Andrew Joo Kim - Atlanta GA, US
Edward Gebara - Atlanta GA, US
Bruce C. Schmukler - Duluth GA, US
Mark W. Dickmann - Palm Harbor FL, US
Michael F. Farrell - Atlanta GA, US
Michael G. Vrazel - Chamblee GA, US
David Anthony Stelliga - Palo Alto CA, US
Joy Laskar - Marietta GA, US
Charles E. Summers - Woodstock GA, US

Assignee:

Quellan, Inc. - Atlanta GA

International Classification:

H04B 1/00
H04B 15/00

US Classification:

455 631, 455570, 4551142, 455222, 4552263

Abstract:

Signals propagating on an aggressor communication channel can cause detrimental interference in a victim communication channel. A signal processing circuit can generate an interference cancellation signal that, when applied to the victim communication channel, cancels the detrimental interference. The signal processing circuit can dynamically adjust or update two or more aspects of the interference cancellation signal, such as an amplitude or gain parameter and a phase or delay parameter. Via the dynamic adjustments, the signal processing circuit can adapt to changing conditions, thereby maintaining an acceptable level of interference cancellation in a fluctuating operating environment. A control circuit that implements the parametric adjustments can have at least two modes of operation, one for adjusting the amplitude parameter and one for adjusting the phase parameter. The modes can be selectable or can be intermittently available, for example.

US Patent:

7804760, Sep 28, 2010

Filed:

Aug 23, 2006

Appl. No.:

11/509112

Inventors:

Bruce C. Schmukler - Duluth GA, US
Arvind Raghavan - Waltham MA, US
Ziba Nami - Duluth GA, US
Jyothi Emmanuel Peddi - Austell GA, US
Andrew Joo Kim - Atlanta GA, US
Michael G. Vrazel - Chamblee GA, US
Charles E. Summers - Woodstock GA, US

Assignee:

Quellan, Inc. - Atlanta GA

International Classification:

H04B 3/20

US Classification:

370201

Abstract:

A circuit can process a sample of a signal to emulate, simulate, or model an effect on the signal. Thus, an emulation circuit can produce a representation of a real-world signal transformation by processing the signal according to one or more signal processing parameters that are characteristic of the real-world signal transformation. The emulation circuit can apply analog signal processing and/or mixed signal processing to the signal. The signal processing can comprise feeding the signal through two signal paths, each having a different delay, and creating a weighted sum of the outputs of the two signal paths. The signal processing can also (or alternatively) comprise routing the signal through a network of delay elements, wherein a bank of switching or routing elements determines the route and thus the resulting delay.

US Patent:

8068406, Nov 29, 2011

Filed:

Oct 19, 2009

Appl. No.:

12/581511

Inventors:

Andrew Joo Kim - Atlanta GA, US
Michael G. Vrazel - Atlanta GA, US
Sanjay Bajekal - Marietta GA, US
Charles Summers - Woodstock GA, US

Assignee:

Quellan, Inc. - Atlanta GA

International Classification:

H04L 12/26

US Classification:

370201, 370286

Abstract:

Signals propagating in one communication channel can generate crosstalk interference in another communication channel. A crosstalk cancellation device can process the signals causing the crosstalk interference and generate a crosstalk cancellation signal that can compensate for the crosstalk when applied to the channel receiving crosstalk interference. The crosstalk cancellation device can include a model of the crosstalk effect that generates a signal emulating the actual crosstalk both in form an in timing. The crosstalk cancellation device can include a controller that monitors crosstalk-compensated communication signals and adjusts the model to enhance crosstalk cancellation performance. The crosstalk cancellation device can have a mode of self configuration or calibration in which defined test signals can be transmitted on the crosstalk-generating channel and the crosstalk-receiving channel.

US Patent:

8605566, Dec 10, 2013

Filed:

Aug 25, 2010

Appl. No.:

12/868190

Inventors:

Bruce C. Schmukler - Duluth GA, US
Arvind Raghavan - Waltham MA, US
Ziba Nami - Duluth GA, US
Jyothi Emmanuel Peddi - Austell GA, US
Andrew Joo Kim - Atlanta GA, US
Michael G. Vrazel - Chamblee GA, US
Charles E. Summers - Woodstock GA, US

Assignee:

Quellan, Inc. - Atlanta GA

International Classification:

H04B 3/20

US Classification:

370201

Abstract:

A circuit can process a sample of a signal to emulate, simulate, or model an effect on the signal. Thus, an emulation circuit can produce a representation of a real-world signal transformation by processing the signal according to one or more signal processing parameters that are characteristic of the real-world signal transformation. The emulation circuit can apply analog signal processing and/or mixed signal processing to the signal. The signal processing can comprise feeding the signal through two signal paths, each having a different delay, and creating a weighted sum of the outputs of the two signal paths. The signal processing can also (or alternatively) comprise routing the signal through a network of delay elements, wherein a bank of switching or routing elements determines the route and thus the resulting delay.

US Patent:

56256671, Apr 29, 1997

Filed:

Jun 2, 1995

Appl. No.:

8/460126

Inventors:

John V. Vogt - Norcross GA
Charles E. Summers - Canton GA

Assignee:

Northern Telecom Limited - Montreal

International Classification:

H04M 308
H04M 327
H04M 124

US Classification:

379 30

Abstract:

For measuring characteristics (resistance, capacitance, and foreign voltage) on a telephone line, source voltages are coupled via source resistances to the line in three test conditions and the parameters are calculated from steady state voltages at the terminals of the line. Each steady state voltage is predictively calculated from nine samples of the voltage at the terminal using a closed form second order solution of a circuit model of the telephone line derived from a transformation of the circuit model into the Z domain and using the matched pole-zero technique. The steady state voltages can thus be determined without waiting for transients, due to the time constants of the telephone line, to die out, resulting in much faster measurements for telephone lines with large time constants.

US Patent:

54447593, Aug 22, 1995

Filed:

Sep 20, 1993

Appl. No.:

8/123085

Inventors:

John V. Vogt - Norcross GA
Charles E. Summers - Canton GA

Assignee:

Northern Telecom Limited - Montreal

International Classification:

H04M 308
H04M 322
H04M 124

US Classification:

379 30

Abstract:

For measuring characteristics (resistance, capacitance, and foreign voltage) on a telephone line, source voltages are coupled via source resistances to the line in three test conditions and the parameters are calculated from steady state voltages at the terminals of the line. Each steady state voltage is predictively calculated from nine samples of the voltage at the terminal using a closed form second order solution of a circuit model of the telephone line derived from a transformation of the circuit model into the Z domain and using the matched pole-zero technique. The steady state voltages can thus be determined without waiting for transients, due to the time constants of the telephone line, to die out, resulting in much faster measurements for telephone lines with large time constants.