Deep Neural Network based Distance Estimation for Geometry Calibration in Acoustic Sensor Networks

TL;DR

This paper introduces a deep neural network approach for estimating distances in reverberant environments to facilitate geometry calibration in wireless acoustic sensor networks, requiring only rough clock synchronization.

Contribution

It proposes a novel DNN-based distance estimation method that generalizes across environments and enables accurate sensor geometry calibration with minimal synchronization requirements.

Findings

The DNN-based estimator generalizes well to unseen environments.

Precise sensor node position estimates are achieved.

The method requires only rough clock synchronization.

Abstract

We present an approach to deep neural network based (DNN-based) distance estimation in reverberant rooms for supporting geometry calibration tasks in wireless acoustic sensor networks. Signal diffuseness information from acoustic signals is aggregated via the coherent-to-diffuse power ratio to obtain a distance-related feature, which is mapped to a source-to-microphone distance estimate by means of a DNN. This information is then combined with direction-of-arrival estimates from compact microphone arrays to infer the geometry of the sensor network. Unlike many other approaches to geometry calibration, the proposed scheme does only require that the sampling clocks of the sensor nodes are roughly synchronized. In simulations we show that the proposed DNN-based distance estimator generalizes to unseen acoustic environments and that precise estimates of the sensor node positions are obtained.