LEFEBVRE Roch

Eng., Ph. D.
Full professor
Director of Speech and Audio Processing Laboratory

Coordinates

Français

Education

  • B. Sc. Physics, McGill University, 1989
  • M. Sc. A. electrical engineering, Université de Sherbrooke, 1992
  • Ph.D. electrical engineering, Université de Sherbrooke, 1995

Research expertise and domains

  • Digital signal processing
  • Speech and audio processing
  • Speech coding
  • Audio compression
  • Noise reduction and enhancement algorithms
  • Adaptive filtering
  • Digital communications

Research Activities

  • Robust voice transmission in packet networks and VoIP applications
  • Wideband speech coding
  • Variable rate speech coding, signal classification
  • Universal speech/audio coding, hybrid coding models, low rate audio
  • Embedded and multi layer audio coding
  • Multi-channel audio coding, parametric coding of spatial audio (5.1 and beyond)
  • Multi-microphone noise reduction

Teaching Activities

  • 1st year undergraduate : GEL210/GIF230 – Signals and systems
  • 3rd year undergraduate : GEL510 – Digital signal processing
  • 3rd year undergraduate: GEL530 – Microprocessors
  • 4rth year undergraduate : GTA710 : Information coding
  • 4rth year undergraduate: GTA720 : Source coding and quantization
  • Graduate class GEI751 : Vector quantization
  • Graduate class GEI755 : Speech and audio processing

Scientific communications

See detailed publications list

Other information

Collaborations / Industrial partners :

  • National : VoiceAge Corporation (a spin-off of Université de Sherbrooke)
  • International : Nokia, Ericsson, France Telecom, Siemens