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Real-time evidence
Unlike other forms of forensic evidence, audio/video recordings can provide a real-time, eyewitness account of a crime so investigators can watch or hear what transpired. For example: surveillance video from police MVARS/COBAN dashcams capture a DUI arrest in progress or footage of police interrogation room dialog between police and subject is captured.
What kind of results should be expected from enhancement or analysis of audio evidence?
The goal of forensic audio service is to provide the best representation possible of audio evidence. Muffled, noisy, and confusing audio may be clarified so that the words are intelligible. However, each circumstance and recording is unique. While some dramatic improvements in clarity are possible, the results of forensic audio processing are highly dependent on the quality of the source material.
For most crimes, high-quality audio/video recordings are often not available. This is where forensic audio expertise can help clear things up. We have many techniques to enhance recordings that may bring out details and provide a clearer picture of what occurred by making the recording more audible. This valuable tool helps investigators, lawyers, and jurors better conduct their duties.
Original source audio waveform with low volume & loud ambient noise masking speech content.
Digital Audio Workstations & Digital Signal Processing are utilized to achieve results.
Waveform after audio clean-up & enhancement. Ambient noise dramatically reduced and speech volume increased.
Audio/Video Evidence Sources:
Police dashcam audio/video MVARS & COBAN
Police station room audio/video
CCTV Surveillance audio/video installations
Cell Phone
911 Dispatch Calls
Telephone voicemail
Bodycams
Courtroom Recordings
Hospital Recordings
Audio/Video Forensics Technical & Procedural Services:
Evaluate nature of request & recorded source material
Identification of audio/video format type
Analyze audio/video scenes
Identify if Data is Encrypted
Extract & Isolate audio from video
Identify & Describe key scene events, subjects, and timeline
Isolate audio from multiple sources
Locate & Detect audio anomalies
Using DSP (digital signal processing) analyze audio waveforms (at sample level) exposing areas inaudible and raise to audible levels
Use DSP filters & multiband compression to eliminate low-end frequency rumble & high frequency hiss
Maintain Date & Time stamps (if hidden or available) and video clock to exactly correspond to audio for precise evidential representation
Master & Equalize audio dynamic range for consistent Mastered quality audio
Report of processing that was performed
Report of scene, subjects, events, and any notable discoveries within content
Expert Witness Court Declarations
Expert Witness Depositions
Expert Witness Trial Presentation (Illustrative) Materials/Exhibit Compilation
Transcriptions
Attorney Educational Training in (State-of-the-Art) recorded Digital Evidence
