Modern,Audio,Forensics,Forensi technology Modern Audio Forensics
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Forensicaudio deals in the scientific and professional investigation (including thetechnology and tools used) to determine the authenticity of sound where itpertains to criminal cases, as well civil court cases. Based on audio forensics, the results turnedup during investigation can be used as evidence in criminal and civil casesthat deal with anything from family and neighbor disputes, divorce, extortionand even industrial espionage.Audioforensics have been used in virtually every case involving a wiretap orrecorded conversation that was used in a trial and that includes the commonanalysis of surveillance tapes in work environments, particular with disputesbetween employers and employees.The Roots of Forensic audioBeforeaudio forensics was widely used in the professional world and by lawenforcement agencies, the practice was focused mainly among the United Statesgovernment. Linguistics experts andthose versed in studying audio would utilize technology during World War II todissect and analyze the voice patterns of enemies via radio and telephone.DuringWorld War II, specialists utilized a spectrograph to plot the frequencies andamplitudes of voice patterns. Thispractice made it easier to identify individuals of interest and monitorfrequencies for important broadcasts or intelligence.Now, thesesame practices are used with more advanced technology to identify terroristsubjects, reveal their location and discern when the audio was created alongwith other pertinent factors.Digging into Audio ForensicsThoseanalyzing audio dont just listen to speech. Every noise must be carefully considered with audio files because itcould be relevant to the overall recording, encounter, etc. Some of the factors that are commonlyevaluated by audio forensic specialists includeChangesin voice frequencyNoisesemanating from recording devices or other machinesBackgroundnoise and natural artifactsUnnaturalartifactsPausesignatures as well as start and stop pointsThese areall important points because unnatural noises or an inconsistency in noisepatterns could mean the audio was compromised, or that itsnot authentic. There are also factorsconsidered when audio forensics specialists have to identify multiple speakersin meetings where voices carry over one another. Some of the factors they analyze includePitchBreathpatternsNasalResonanceVowelformationAudio Forensics and Law EnforcementTranscriptionIn manycases, law enforcement agencies call upon audio forensic specialists not onlyto study and dissect recorded audio, but also to provide transcriptionservices. Simply providing a report ofthe data is not enough in all cases. Tobe admissible as evidence, a certified transcript of the entire audio recordingis required for review.This canbe an exceptional amount of work. Unlikeother forms of transcription where only the voice is recorded, law enforcementtranscription sometimes requires every sound and artifact to be documented andtranscribed. This includes voices, doorsopening and closing, chairs scraping across floor, rustling, sighing, lipsmacking, papers being shuffled, etc.Each oneof these noises could provide insight into an interrogation, meeting, orencounter that may not typically be picked up by the untrained ear. Detection of these noises, as well asdiscontinuities in other types of recordings can be difficult, but certainlynot impossible for those who specialize in audio forensics.
Modern,Audio,Forensics,Forensi