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Dive into the research topics where Wilf LeBlanc is active.

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Featured researches published by Wilf LeBlanc.


2012 IEEE International Conference on Emerging Signal Processing Applications | 2012

Performance improvement of acoustic ECHO cancellers in the presence of external volume change

Wilf LeBlanc; Elias Nemer

This paper presents a new method for improving the performance of an acoustic echo canceller operating in a hands-free telephony context, where the terminal connects to an external amplifier whose volume can be changed arbitrarily. This change would normally results in the canceller loosing convergence, and temporarily causes an echo to be heard by the far side. The proposed method provides an effective way to quickly compensate, by continuously tracking key measures across the frequency bands, and adjusting the coefficients as well as the output of the cancellers filter, in order to minimize the level and duration of the residual echo. A subband architecture consisting of two sets of cancellers is considered. Changes in external volume (or tone) are translated into a complex gain (or set of gains) and applied to the output or the coefficients of the foreground canceller filter, according to the optimality criterion of minimizing the mean square error (MSE) at the canceller output. The algorithm uses various metrics to ensure the validity of the computed gains and the overall cancellers stability. Listening tests and perceptual evaluation of speech quality (PESQ) score done in a real-life setting show the method results in a noted improvement of the overall perceptual performance of the canceller.


Archive | 2000

Voice and data exchange over a packet based network

Henry Li; David M. Enns; Jordan J. Nicol; Kenny C. Kwan; Ross Mitchell; Wilf LeBlanc; Ken Unger; John Payton; Shawn Stevenson; Bill Boora; Onur Tackin


Archive | 2004

Method and system for an adaptive multimode media queue

Wilf LeBlanc; Phil Houghton; Kenneth Cheung


Archive | 2008

Voice and Data Exchange Over a Packet Based Network With DTMF

Wilf LeBlanc; Shawn Stevenson


Archive | 2006

Voice and data exchange over a packet based network with AGC

Onur Tackin; Scott Branden; Chad Griffiths; Wilf LeBlanc


Archive | 2012

Loudspeaker beamforming for personal audio focal points

Ike Ikizyan; Wilf LeBlanc


Archive | 2000

Voice and data exchange over a packet based network with comfort noise generation

Wilf LeBlanc; Shawn Stevenson; Wing Yee Winnie Lee


Archive | 2000

Voice and data exchange over a packet based network with echo cancellation

Wilf LeBlanc; Shawn Stevenson; Bill Boora


Archive | 2000

Voice and data exchange over a packet based network with resource management

Wilf LeBlanc; Shawn Stevenson


Archive | 2010

Switchboard for multiple data rate communication system

Wilf LeBlanc; Phil Houghton; Kenneth Cheung

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