robotique co2

Seminar on Systems and Control

June 24, 2026 at 10:30 AM

Emilia Fridman et Camille Leblanc

Emilia Fridman

Title: Delay-Robust Control of PDEs

Abstract:

Some PDEs may not be robust with respect to arbitrary small time-delays in the feedback. Robust finite-dimensional controller design for PDEs is a challenging problem. In this talk two constructive methods for delay-robust control will be briefly presented:

  1. Spatial decomposition (or sampling in space) method, where the spatial domain is divided into N subdomains with N sensors and actuators located in each subdomain;
  2. Modal decomposition method, where the controller is designed on the basis of a finite-dimensional system that captures the dominant dynamics of the infinite-dimensional one. Sufficient conditions ensuring the performance and domains of attraction of the closed-loop systems are established in terms of simple LMIs that are always feasible for appropriate choice of controller parameters.

Camille Leblanc

Title: Fundamental frequency estimation for speech enhancement

Abstract:

Speech enhancement can be achieved within the analysis/synthesis framework. The principle is to analyse the speech signals as an harmonic excitation produced by the vocal chords, and a filter corresponding to the vocal tract. By estimating both the excitation signal and the filter spectral shape, it is possible to synthesize and possibly enhance the speech. This presentation focuses on the estimation of the harmonic excitation’s fundamental frequency using limited computational ressources.

This problem can be put in form of a linear regression. An estimator is proposed to approach the frequencies contained in the signal, while enforcing that the frequency estimates respect the harmonicity constraint.

Inria, Building A, room A00

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