Digital audio recording forgeries are often created using simple editing techniques such as ‘butt splicing’. Butt splicing may leave discontinuities in the audio waveform that may or may not be audible. Detection of butt-spliced edits will be discussed and a new method to detect edits made in this manner will be proposed. The process operates in the time domain and is based on high pass filtering the audio data and modelling a discontinuity at higher frequencies where the ratio of discontinuity energy to acoustic signal energy level is improved. The model is then used as a template to search for potential edits in the filtered audio signal. The technique is optimised for data that has not been perceptually encoded post editing and is capable of detecting discontinuity points within a recording that are not discernable by auditory analysis.
Author:
Cooper, Alan J.
Affiliation:
Metropolitan Police Digital & Electronics Forensic Service, London, UK
AES Conference:
39th International Conference: Audio Forensics: Practices and Challenges (June 2010)
Paper Number:
1-1
Publication Date:
June 17, 2010
Subject:
Audio Forensics: Authentication - Other Analysis Techniques
Click to purchase paper as a non-member or you can login as an AES member to see more options.
No AES members have commented on this paper yet.
To be notified of new comments on this paper you can subscribe to this RSS feed. Forum users should login to see additional options.
If you are not yet an AES member and have something important to say about this paper then we urge you to join the AES today and make your voice heard. You can join online today by clicking here.