Faked Speech Detection with Zero Prior Knowledge

TL;DR

This paper presents a neural network-based classifier capable of detecting fake speech without prior knowledge, achieving over 94% accuracy, surpassing human performance on the same task.

Contribution

Introduces a blind speech forgery detection method using a deep neural network trained on extracted audio features, effective across multiple languages.

Findings

Achieved at least 94% accuracy in classifying real vs. fake speech.

Outperformed human observers, who achieved 85% accuracy.

Validated on datasets with English and mixed language audios.

Abstract

Audio is one of the most used ways of human communication, but at the same time it can be easily misused to trick people. With the revolution of AI, the related technologies are now accessible to almost everyone, thus making it simple for the criminals to commit crimes and forgeries. In this work, we introduce a neural network method to develop a classifier that will blindly classify an input audio as real or mimicked; the word 'blindly' refers to the ability to detect mimicked audio without references or real sources. We propose a deep neural network following a sequential model that comprises three hidden layers, with alternating dense and drop out layers. The proposed model was trained on a set of 26 important features extracted from a large dataset of audios to get a classifier that was tested on the same set of features from different audios. The data was extracted from two raw datasets, especially composed for this work; an all English dataset and a mixed dataset (Arabic plus English) (The dataset can be provided, in raw form, by writing an email to the first author). For the purpose of comparison, the audios were also classified through human inspection with the subjects being the native speakers. The ensued results were interesting and exhibited formidable accuracy, as we were able to get at least 94% correct classification of the test cases, as against the 85% accuracy in the case of human observers.