383 citations · 1.4k across the 49 of their papers we have counts for
12 papers · 2 filters
Channel Decorrelation For Stereo Acoustic Echo Cancellation In High-Quality Audio Communication
Jean-Marc Valin
In this paper, we address an important problem in high-quality audio communication systems. Acoustic echo cancellation with stereo signals is generally an under-determined problem…
Microphone array post-filter for separation of simultaneous non-stationary sources
Jean-Marc Valin, Jean Rouat, François Michaud
Microphone array post-filters have demonstrated their ability to greatly reduce noise at the output of a beamformer. However, current techniques only consider a single source of in…
Improved Noise Weighting in CELP Coding of Speech - Applying the Vorbis Psychoacoustic Model To Speex
Jean-Marc Valin, Christopher Montgomery
One key aspect of the CELP algorithm is that it shapes the coding noise using a simple, yet effective, weighting filter. In this paper, we improve the noise shaping of CELP using a…
Low-Complexity Iterative Sinusoidal Parameter Estimation
Jean-Marc Valin, Daniel V. Smith, Christopher Montgomery +1
Sinusoidal parameter estimation is a computationally-intensive task, which can pose problems for real-time implementations. In this paper, we propose a low-complexity iterative met…
Speex: A Free Codec For Free Speech
Jean-Marc Valin
The Speex project has been started in 2002 to address the need for a free, open-source speech codec. Speex is based on the Code Excited Linear Prediction (CELP) algorithm and, unli…
Perceptually-Motivated Nonlinear Channel Decorrelation For Stereo Acoustic Echo Cancellation
Jean-Marc Valin
Acoustic echo cancellation with stereo signals is generally an under-determined problem because of the high coherence between the left and right channels. In this paper, we present…
A New Robust Frequency Domain Echo Canceller With Closed-Loop Learning Rate Adaptation
Jean-Marc Valin, Iain B. Collings
One of the main difficulties in echo cancellation is the fact that the learning rate needs to vary according to conditions such as double-talk and echo path change. Several methods…
Bandwidth Extension of Narrowband Speech for Low Bit-Rate Wideband Coding
Jean-Marc Valin, Roch Lefebvre
Wireless telephone speech is usually limited to the 300-3400 Hz band, which reduces its quality. There is thus a growing demand for wideband speech systems that transmit from 50 Hz…
Extension spectrale d'un signal de parole de la bande téléphonique à la bande AM
Jean-Marc Valin
This document proposes a bandwidth extension system producing a wideband signal from a narrowband speech signal. The extension is performed independently for high and low frequenci…
On Adjusting the Learning Rate in Frequency Domain Echo Cancellation With Double-Talk
Jean-Marc Valin
One of the main difficulties in echo cancellation is the fact that the learning rate needs to vary according to conditions such as double-talk and echo path change. In this paper w…
An Iterative Linearised Solution to the Sinusoidal Parameter Estimation Problem
Jean-Marc Valin, Daniel V. Smith, Christopher Montgomery +1
Signal processing applications use sinusoidal modelling for speech synthesis, speech coding, and audio coding. Estimation of the model parameters involves non-linear optimisation m…
A High-Quality Speech and Audio Codec With Less Than 10 ms Delay
Jean-Marc Valin, Timothy B. Terriberry, Christopher Montgomery +1
With increasing quality requirements for multimedia communications, audio codecs must maintain both high quality and low delay. Typically, audio codecs offer either low delay or hi…