InterGridNet: An Electric Network Frequency Approach for Audio Source Location Classification Using Convolutional Neural Networks

TL;DR

InterGridNet is a new deep learning framework that uses a shallow RawNet model with neural architecture search to classify electric network frequency signatures for geolocation, achieving 92% accuracy.

Contribution

The paper introduces InterGridNet, a novel CNN-based approach with optimized hyperparameters for ENF-based audio geolocation classification, outperforming previous methods.

Findings

Achieved 92% accuracy on SP Cup 2016 dataset.

Effectively classified audio recordings from different power grids.

Demonstrated the superiority of the optimized shallow RawNet model.

Abstract

A novel framework, called InterGridNet, is introduced, leveraging a shallow RawNet model for geolocation classification of Electric Network Frequency (ENF) signatures in the SP Cup 2016 dataset. During data preparation, recordings are sorted into audio and power groups based on inherent characteristics, further divided into 50 Hz and 60 Hz groups via spectrogram analysis. Residual blocks within the classification model extract frame-level embeddings, aiding decision-making through softmax activation. The topology and the hyperparameters of the shallow RawNet are optimized using a Neural Architecture Search. The overall accuracy of InterGridNet in the test recordings is 92%, indicating its effectiveness against the state-of-the-art methods tested in the SP Cup 2016. These findings underscore InterGridNet's effectiveness in accurately classifying audio recordings from diverse power grids, advancing state-of-the-art geolocation estimation methods.