Noise-Robust Adaptation Control for Supervised Acoustic System Identification Exploiting A Noise Dictionary

TL;DR

This paper introduces a noise-robust adaptation control method for acoustic system identification that leverages a learned noise dictionary to improve convergence speed amid non-stationary noise and system changes.

Contribution

It proposes a novel machine-learning based approach using a noise dictionary modeled in a Gaussian state space framework for enhanced noise robustness.

Findings

Faster convergence in high-level noise environments

Effective modeling of noise using learned dictionaries

Improved adaptation speed during abrupt system changes

Abstract

We present a noise-robust adaptation control strategy for block-online supervised acoustic system identification by exploiting a noise dictionary. The proposed algorithm takes advantage of the pronounced spectral structure which characterizes many types of interfering noise signals. We model the noisy observations by a linear Gaussian Discrete Fourier Transform-domain state space model whose parameters are estimated by an online generalized Expectation-Maximization algorithm. Unlike all other state-of-the-art approaches we suggest to model the covariance matrix of the observation probability density function by a dictionary model. We propose to learn the noise dictionary from training data, which can be gathered either offline or online whenever the system is not excited, while we infer the activations continuously. The proposed algorithm represents a novel machine-learning based approach to noise-robust adaptation control which allows for faster convergence in applications characterized by high-level and non-stationary interfering noise signals and abrupt system changes.