13 February 2012 Extending a context model for microphone forensics
Author Affiliations +
In this paper, we extend an existing context model for statistical pattern recognition based microphone forensics by: first, generating a generalized model for this process and second, using this general model to construct a complex new application scenario model for microphone forensic investigations on the detection of playback recordings (a.k.a. replays, re-recordings, double-recordings). Thereby, we build the theoretical basis for answering the question whether an audio recording was made to record a playback or natural sound. The results of our investigations on the research question of playback detection imply that it is possible with our approach on our evaluation set of six microphones. If the recorded sound is not modified prior to playback, we achieve in our tests 89.00% positive indications on the correct two microphones involved. If the sound is post-processed (here, by normalization) this figure decreases (in our normalization example to 36.00%, while another 50.67% of the tests still indicate two microphones, of which one has actually not been involved in the recording and playback recording process).
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Christian Kraetzer, Christian Kraetzer, Kun Qian, Kun Qian, Jana Dittmann, Jana Dittmann, } "Extending a context model for microphone forensics", Proc. SPIE 8303, Media Watermarking, Security, and Forensics 2012, 83030S (13 February 2012); doi: 10.1117/12.906569; https://doi.org/10.1117/12.906569


Modeling human false alarms using clutter metrics
Proceedings of SPIE (November 14 2007)
Approach to on-line monitoring for generator set
Proceedings of SPIE (September 21 1993)
Neural Net Classifier For Millimeter Wave Radar
Proceedings of SPIE (December 05 1989)

Back to Top