Tel: +46 (0)733 14 44 04 Email: info@datarecoverysweden.se
Digital Audio Forensics Solutions
The bespoke area of our work is to process very poor quality audio files and enhance them to produce pristine, clean and tidy post processed digital audio tracks that conform to any specific need of our clients.
Our work mainly involves the extraction of inaudible dialogue from poor quality recordings, so that what is being said can be heard correctly. (However we can process audio in many other ways depending on the client's requirement). We go much further that just running ‘Denoisers’ and 'EQing' to correct poor audio recordings… The areas that we focus on when improving audio quality means we are dealing with the elimination of many types of sound artifacts that occur naturally and can damage the quality of any recording, (both in and out of the studio). Such as:
- Wind and other types of extreme weather
- Sneezing / coughing / unwanted breathing noises / popping the microphone
- Hum and Hiss removal or reduction from badly grounded recording equipment
- Isolation of vital source audio artifacts
- Removal of unwanted small random sonic events, that get in the way of vocal intelligibility
- Preserve harmonics - if needed
- Elimination of all unwanted static interference and other ambient background noise such as traffic and crowd chatter
Legal Work: Digital Audio Forensics
Time-stamped task histories, which we normally submit as XML files with screenshots, are important when we are tasked with legal work. The modern courtroom requires specific types of audit trail to confirm the validity of any audio evidence in question. As audio technologies advance, the same tools that improve the clarity of audio evidence can also be used to obscure the truth, either through counterfeiting or concealing source file manipulation. The documentation provided by our teams prove that no audio files have been wrongfully tampered with, once the recordings have been released to us for processing.
Sometimes the courts request us to authenticate the re-processed audio files, which require hard proof of discontinuity, location analysis, voice and equipment identification... We then always provide spectral profiles for future comparison – therefore, preserving legal integrity and ensuring a verifiable chain of custody. Time-stamped task histories, which we normally submit as XML files with screenshots, are important when we are tasked with legal work.
We also can assist in the clean-up of undercover or concealed microphone/ hidden camera audio recordings.
Our Equipment
Our technical equipment supports:
- All analogue audio playback devices. Tape, Vinyl, Cartridge, Vintage.
- All optical audio playback devices. MiniDisc, CD, DVD, Blu-ray, Magneto-optical
- All digital format playback devices.
- All known digital audio file formats - RAW and Compressed.
A vast array of audio rack hardware, channel strip and software post processing tools. And we can usually source any other obscure playback hardware, for the rare cases when we get obsolete archived media from long term storage facilities.
We employ many different approaches to the work we do and the job flow is usually different for every job. Depending on the type of result required, some of the methods we typically use are: heuristic analysis, spectral analysis and mathematical algorithms.
A digital or analogue audio signal can be decomposed into a number of discrete frequencies, or a spectrum of frequencies. The statistical average of a certain signal, (or collection or signals), as analyzed in terms of its frequency content, is known as a spectrum analysis.
Our Clients and Scope
We support an array of professional personel to include: Law firms, Insurance claims disputes, Civil cases (Private customers), Employment law, Music producers, Police and Security Forces, Contract law, Private Investigators amd other legal activities.
Examples of what we do
Audio Sources
Our Techniques
Our core activities are to extract, separate AND isolate vocals, (or any other specified audio artifact), from any audio track with any of the following: