This article deals with a technique of voice forgery using the ALISP (Automatic Language Independent Speech Processing) approach. Such a technique allows to transform the voice of an arbitrary person (the impostor), forging the identity of another person (the client). Our goal is to demonstrate that an automatic speaker recognition system could be seriously… (More)
In the field of forensic sciences, finding out a solution to discriminate a normal voice from a disguised voice could provide interesting clues to investigators. Nevertheless, this task is not obvious because of the definition of a " normal voice " , of the natural variability and of the different disguise possibilities. Speaker recognition is unavoidable… (More)
This article describes techniques of vocal forgery able to affect automatic speaker recognition system in a forensic context. Vocal forgery covers two main aspects: voice transformation and voice conversion. Concerning voice transformation, this article proposes an automatic analysis of four specific disguised voices in order to detect the forgery and, for… (More)
In this paper, we describe a technique to detect image tampering using two different methods. The first is based on the Bayer interpolation process and its consequences in the Fourier domain. The second uses artifacts of the JPEG compression and more particularly in the JPEG frame observable in the Fourier domain.
Natural speech is produced by the vocal organs of a particular talker. The acoustic features of the speech signal must therefore be correlated with the movements of the articulators (lips, jaw, tongue, velum,...). For instance, hearing impaired people (and not only them) improve their understanding of speech by lip reading. This chapter is an overview of… (More)
This study focuses on the question of voice disguise and the problem of its detection. The voice disguise is considered as a deliberated action of the speaker who wants to falsify or to conceal his identity. Lots of possibilities are offered to a speaker to change his voice and to false a human ear or an automatic system. He could transform his voice by… (More)
Virtual worlds are developing rapidly over the internet. They are visited by avatars and staffed with Embodied Conversational Agents (ECAs). An avatar is a representation of a physical person. Each person controls one or several avatars and usually receives feedback from the virtual world on an audiovisual display. Ideally, all senses should be used to feel… (More)
Virtual worlds are developing rapidly over the Internet. They are visited by avatars and staffed with Embodied Conversational Agents (ECAs). An avatar is a representation of a physical person. Each person controls one or several avatars and usually receives feedback from the virtual world on an audiovisual display. Ideally, all senses should be used to feel… (More)