Follow on Google News News By Tag Industry News * forensic audio consulting * More Industries... News By Location Country(s) Industry News
Follow on Google News | Prism Forensics LLC Presents At The 46th Aes Forensic Audio ConventionPhase and Amplitude Analysis of the Electric Network Frequency presented and published at the 46th AES Forensic Audio Convention.
By: Prism Forensics LLC At this time examiners may not have access to official ENF databases as this is a fairly new procedure. It was therefore necessary to develop methods that would enable the detection of edits within the ENF without the need of a reference database. The ENF is a continuous sine wave, in other words a signal formed of peaks and valleys, following each other by exactly the same amount. Any discrepancies between the peaks and valleys could indicate a potential edit within the recording. The discrepancies are usually very small and undetectable to the naked eye. The method proposed in Sean Coetzee’s study enables easy, quick and accurate visualization of potential phase breaks. When phase discontinuity occurs in the recording a decrease in amplitude will be present within the vicinity of the phase break. Using various down sampling and filtering procedures these amplitude changes can be easily detected in a time series window (oscilloscope) With the constant development of digital audio technology the need for such conventions is paramount. It’s an opportunity for the forensic audio community to work together in developing new methods in regards to forensic audio analysis. By bringing our research together we are bringing standardization within the industry and demonstrating the reliability of our science. Sean Coetzee is the owner of Prism Forensics LLC which provides audio enhancement and authentication analysis. He is a graduate of Brighton University, UK with a BA in Music Production and a professional sound engineer, having worked in studios in the UK, France and the USA. He is a listed expert with the Los Angeles Superior Court and a certified forensic consultant with the American College of Forensic Examiners Institute (ACFEI). End
Account Email Address Account Phone Number Disclaimer Report Abuse
|
|