Kenneth P Laberteaux

US Patent:

6337907, Jan 8, 2002

Filed:

Nov 21, 2000

Appl. No.:

09/717932

Inventors:

Kenneth P. Laberteaux - South Bend IN
Richard C. Younce - Wakarush IN

Assignee:

Tellabs Operations, Inc. - Lisle IL

International Classification:

H04M 100

US Classification:

37940608, 370290

Abstract:

An echo canceller circuit for use in an echo canceller system is set forth. The echo canceller circuit comprises a first digital filter having non-adaptive tap coefficients to simulate an echo response occurring during a call. A second digital filter having adaptive tap coefficients to simulate an echo response occurring during the call is also used. The adaptive tap coefficients of the second digital filter are updated over the duration of the call. A coefficient transfer controller is disposed in the echo canceller circuit to transfer the adaptive tap coefficients of the second digital filter to replace the tap coefficients of the first digital filter when a value, Ã, is greater than a value, {overscore (E)}, and, concurrently, when à is greater than a value, E. The value of {overscore (E)} corresponds to the ratio between a signal-plus-echo signal and a first echo compensated signal using the first digital filter. The value of à corresponds to the ratio between the signal-plus-echo signal and a second echo compensated signal using the second digital filter.

US Patent:

6507652, Jan 14, 2003

Filed:

Jan 18, 2000

Appl. No.:

09/483988

Inventors:

Kenneth P. Laberteaux - South Bend IN

Assignee:

Tellabs Operations, Inc. - Naperville IL

International Classification:

H04M 100

US Classification:

37940605, 37940608

Abstract:

An echo canceller circuit for use in an echo canceller system is set forth that provides sensitive non-linear echo path response detection. The echo canceller circuit comprises a first digital filter having non-adaptive tap coefficients to simulate an echo response occurring during a call. A second digital filter having adaptive tap coefficients to simulate an echo response occurring during the call is also used. The adaptive tap coefficients of the second digital filter are updated over the duration of the call. A coefficient transfer controller is disposed in the echo canceller circuit to transfer the adaptive tap coefficients of the second digital filter to replace the tap coefficients of the first digital filter when a set of one or more transfer conditions is met. A non-linear echo path response detector is provided. The non-linear echo path detector is responsive to one or more parameters of the first and second digital filters to detect a non-linear echo path condition.

US Patent:

6614907, Sep 2, 2003

Filed:

Jan 18, 2000

Appl. No.:

09/484947

Inventors:

Kenneth P. Laberteaux - South Bend IN
Richard C. Younce - Wakarush IN
Bruce E. Dunne - Naperville IL
David S. Farrell - Lisle IL

Assignee:

Tellabs Operations, Inc. - Naperville IL

International Classification:

H04M 100

US Classification:

37940603, 37940608

Abstract:

An echo canceller circuit for use in an echo canceller system is set forth that provides sensitive double-talk detection. The echo canceller circuit comprises a second digital filter having adaptive tap coefficients to stimulate an echo response occurring during the call. The adaptive tap coefficients of the second digital filter are updated over the duration of the call using a Least Mean Squares process having an adaptive gain a. A channel condition detector is used to detect channel conditions during the call. The channel condition detector is responsive to detected channel conditions for changing the adaptive gain a during the call. For example, the channel condition detector may detect the presence of a double-talk condition and set the adaptive gain a to zero. Similarly, the channel condition detector may detect the occurrence of a high background noise condition and set the adaptive gain a to a level less than 1 that is dependent on the detected level of the background noise. Other similar channel conditions and corresponding adaptive gain settings may likewise be utilized.

US Patent:

6718035, Apr 6, 2004

Filed:

Apr 16, 2001

Appl. No.:

09/834718

Inventors:

Richard C. Younce - Wakarush IN
Kenneth P. Laberteaux - South Bend IN

Assignee:

Tellabs Operations, Inc. - Naperville IL

International Classification:

H04M 900

US Classification:

37940601, 37940608

Abstract:

An echo canceller circuit is set forth. The echo canceller circuit includes a digital filter having adaptive tap coefficients to simulate an echo response occurring during a call. The adaptive tap coefficients are updated during the call using a Means Squares process. A tap energy detector is also employed. The tap energy detector identifies and divides groups of taps having high energy from groups of taps having low energy. The high energy tap groups are smaller in number than the low energy tap groups. The high energy tap groups are adapted separately from the low energy tap groups using the Least Squares process. Still further, the high energy tap groups may be adapted using an adaptive gain constant a while the low energy tap groups are adapted using an adaptive gain constant aâ, wherein a aâ.

US Patent:

7031459, Apr 18, 2006

Filed:

Nov 8, 2002

Appl. No.:

10/291304

Inventors:

Kenneth P. Laberteaux - South Bend IN, US

Assignee:

Tellabs Operations, Inc. - Naperville IL

International Classification:

H04M 1/00

US Classification:

37940605, 37940608, 37940611

Abstract:

An echo canceller circuit for use in an echo canceller system is set forth that provides sensitive non-linear echo path response detection. The echo canceller circuit comprises a first digital filter having non-adaptive tap coefficients to simulate an echo response occurring during a call. A second digital filter having adaptive tap coefficients to simulate an echo response occurring during the call is also used. The adaptive tap coefficients of the second digital filter are updated over the duration of the call. A coefficient transfer controller is disposed in the echo canceller circuit to transfer the adaptive tap coefficients of the second digital filter to replace the tap coefficients of the first digital filter when a set of one or more transfer conditions is met. A non-linear echo path response detector is provided. The non-linear echo path detector is responsive to one or more parameters of the first and second digital filters to detect a non-linear echo path condition.

US Patent:

7167799, Jan 23, 2007

Filed:

Mar 23, 2006

Appl. No.:

11/387414

Inventors:

Dmitri A. Dolgov - Ann Arbor MI, US
Kenneth P. Laberteaux - Ann Arbor MI, US

Assignee:

Toyota Technical Center USA, Inc. - Ann Arbor MI

International Classification:

G01C 23/00
G06F 19/00

US Classification:

701301, 701213

Abstract:

A system and method of intelligent navigation with collision avoidance for a vehicle is provided. The system includes a global positioning system and a vehicle navigation means in communication with the global positioning system. The system also includes a centrally located processor in communication with the navigation means, and an information database associated with the controller, for identifying a location of a first vehicle and a second vehicle. The system further includes an alert means for transmitting an alert message to the vehicle operator regarding a collision with a second vehicle. The method includes the steps of determining a geographic location of a first vehicle and a second vehicle within an environment using the global positioning system on the first vehicle and the global positioning system on the second vehicle, and modeling a collision avoidance domain of the environment of the first vehicle as a discrete state space Markov Decision Process. The methodology scales down the model of the collision avoidance domain, and determines an optimal value function and control policy that solves the scaled down collision avoidance domain. The methodology extracts a basis function from the optimal value function, scales up the extracted basis function to represent the unscaled domain, and determines an approximate solution to the control policy by solving the rescaled domain using the scaled up basis function.

US Patent:

7200222, Apr 3, 2007

Filed:

Jun 23, 2003

Appl. No.:

10/602949

Inventors:

Kenneth P. Laberteaux - South Bend IN, US
Richard C. Younce - Wakarush IN, US
Bruce E. Dunne - Naperville IL, US
David S. Farrell - Lisle IL, US

Assignee:

Tellabs Operations, Inc. - Naperville IL

International Classification:

H04M 1/00

US Classification:

37940606, 37940609, 37940608, 37940605

Abstract:

An echo canceller circuit for use in an echo canceller system is set forth that provides sensitive double-talk detection. The echo canceller circuit comprises a second digital filter having adaptive tap coefficients to simulate an echo response occurring during the call. The adaptive tap coefficients of the second digital filter are updated over the duration of the call using a Least Mean Squares process having an adaptive gain a. A channel condition detector is used to detect channel conditions during the call. The channel condition detector is responsive to detected channel conditions for changing the adaptive gain a during the call. For example, the channel condition detector may detect the presence of a double-talk condition and set the adaptive gain a to zero. Similarly, the channel condition detector may detect the occurrence of a high background noise condition and set the adaptive gain a to a level less than 1 that is dependent on the detected level of the background noise. Other similar channel conditions and corresponding adaptive gain settings may likewise be utilized.

US Patent:

7403610, Jul 22, 2008

Filed:

Feb 17, 2004

Appl. No.:

10/779830

Inventors:

Richard C. Younce - Wakarush IN, US
Kenneth P. Laberteaux - South Bend IN, US

Assignee:

Tellabs Operations, Inc. - Naperville IL

International Classification:

H04M 9/08

US Classification:

37940601, 37940606

Abstract:

An echo canceller circuit is set forth. The echo canceller circuit includes a digital filter having adaptive tap coefficients to simulate an echo response occurring during a call. The adaptive tap coefficients are updated during the call using a Means Squares process. A tap energy detector is also employed. The tap energy detector identifies and divides groups of taps having high energy from groups of taps having low energy. The high energy tap groups are smaller in number than the low energy tap groups. The high energy tap groups are adapted separately from the low energy tap groups using the Least Squares process. Still further, the high energy tap groups may be adapted using an adaptive gain constant α while the low energy tap groups are adapted using an adaptive gain constant α′, wherein α>α′.