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Audio Coding Based on Long Temporal Contexts

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Wide-Band Perceptual Audio Coding based on Frequency-Domain Linear Prediction

Petr Motlicek, Hynek Hermansky

In this paper we propose an extension of the very low bit-rate speech coding technique, exploiting predictability of the temporal evolution of spectral envelopes, for wide-band audio coding applications. Temporal envelopes in critically band-sized sub-band ...

2007

Speech Coding based on Spectral Dynamics

Petr Motlicek, Hynek Hermansky

In this paper we present first experimental results with a novel audio coding technique based on approximating Hilbert envelopes of relatively long segments of audio signal in critical-band-sized sub-bands by autoregressive model. We exploit the generalize ...

2006

Speech Coding based on Spectral Dynamics

Petr Motlicek, Hynek Hermansky

IDIAP2006

Audio Coding Based on Long Temporal Segments: Experiments With Quantization of Excitation Signal

Petr Motlicek

In this paper, we describe additional experiments based on a novel audio coding technique that uses an autoregressive model to approximate an audio signal's Hilbert envelope. This technique is performed over long segments (1000 ms) in critical-band-sized s ...

IDIAP2006

Low delay video coding

Analogue wireless cameras have been employed for decades, however they have not become an universal solution due to their difficulties of set up and use. The main problem is the link robustness which mainly depends on the requirement of a line-of-sight vie ...

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Wide-Band Perceptual Audio Coding based on Frequency-Domain Linear Prediction

Petr Motlicek, Hynek Hermansky

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Improved Time Delay Analysis/Synthesis for Parametric Stereo Audio Coding

Christof Faller, Christophe Tournery

For parametric stereo and multi-channel audio coding, it has been proposed to use level difference, time difference, and coherence cues between audio channels to represent the perceptual spatial features of stereo and multi-channel audio signals. In practi ...

2006

Robust audio segmentation

Jitendra Ajmera

Audio segmentation, in general, is the task of segmenting a continuous audio stream in terms of acoustically homogenous regions, where the rule of homogeneity depends on the task. This thesis aims at developing and investigating efficient, robust and unsup ...

EPFL2005

Parametric coding of spatial audio

Christof Faller

A wide range of techniques for coding a single speech or audio signal channel have been developed over the last few decades. In addition to pure redundancy reduction, sophisticated source and receiver models have been considered for reducing the bitrate. O ...

EPFL2004

Robust Audio Segmentation

Hervé Bourlard, Jitendra Ajmera

École Polytechnique Fédérale de Lausanne2004