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Forensic Audio

Music places certain demands on its tools when performing restoration and enhancement.  The goal in music restoration is to remove as much noise as possible without introducing artifacts and to leave the remainder as "musical" as possible.  With Forensic Audio, we are not constricted by these guidelines.  The only goal, in most cases, is to audibly discern what is being said by certain individuals so that audio, previously obscured by noise can now be heard and understood.  With those goals in mind, tools can be augmented to better service this different need.  Though several important forensics audio applications can be performed with both our DC Millennium software and our DC SIX product,  our DC LIVE/Forensics is designed to specifically deal with voice enhancement in situations where ambient noise is a major problem.

General Recording Techniques

Specific Forensics Tools In DC LIVE/Forensics

Choosing Your Software Tools

Screen Shot Of The Tools

An Educated Taste Test

Hear It For Yourself

Training, Training, Training

Purchase Info

Anything Else I Need To Know?

General Recording Techniques 

Of course, no tools such as these would exist if in fact all recordings were perfect.  And in this world of hidden microphones, wiretaps and other listening devices, odds are that products like this will have a long and hopefully prosperous life, there are some basics to recording that should be followed; regardless of the situation.  

Get the levels right:  Shoot for the Middle!

It is important to get good levels on any system.  But too much level can be just as bad as not enough level.  Shoot for the middle of the road and hope for the best.  You're much better off in today's world of digital enhancement starting with lesser levels than you are with overloaded and distorted files.  With digital devices...unlike the analog days, when you danced the VU meters in the red to get the best recording...red means distortion.  0 dB is too hot and there's really little that can be done for severely clipped audio.  We can always perform a gain adjustment on something too weak, but fixing distorted and clipped audio is a little bit trickier.

Two mics are better than one

Especially in areas where ambient noise is a problem, always try to place two mics...one that monitors the room and one as close to the subjects as possible.  This not only gives you two streams of audio to choose from, but also gives filters like DSS a viable room monitor feed to subtract from the vocal feed.  

Check Your Equipment

Even the best systems fail from time to time, but you can eliminate correctable problems by running a simple test before your evidence is on the line.  Make sure you check your levels and batteries numerous times to verify their integrity before they leave you red-faced or worse.  Also verify that your mics are secured so that they don't fall or tip over during a recording.

Specific Forensics Tools In DC LIVE/Forensics

Successful Audio Forensics depends on trying a variety of methods until you find the one that achieves the best results.  DC LIVE/Forensics provides a menu of specific Forensics tools which we'll list below, but there are also an assortment of non Forensics tools which may help in certain situations.  This list only deals with those tools designed primarily for DC LIVE/Forensics.

DSS Filter The new DSS feature in the DC Live/Forensics software is a unique and powerful tool capable of recovering speech from recordings containing loud music or other coherent noise.  Until now, a recording that was covered or masked by loud music was basically a lost cause.  DSS decoding is designed to make it possible to attenuate this music and uncover the speech. 
Adaptive Filter This filter is used largely in audio applications where the ambient noise environment is constantly changing and the filter coefficients must automatically change to maintain good intelligibility of an audio signal.  The Adaptive filter adjusts itself to remove a modeled signal representing the unwanted time domain waveform while preserving the target signal.
AFDF Forensics Filter  The Forensics Adaptive Frequency Domain Filter (AFDF) is a variation on the basic theme of the Auto Spectrum CNF filter mode.  The primary difference is that the Forensics AFDF is optimized for Forensics oriented files and not “High Fidelity” files.  It has a faster response time and a narrower effective bandwidth while producing higher levels of noise reduction at the expense of potentially producing higher levels of digital artifacts.  The AFDF Filter is “Adaptive”, which means that it will automatically adjust itself to varying noise environments and no noise sample must be taken.  It is fast and easy to use with little or no training, but can garner incredible results.
Polynomial Filter This allows the mathematicians, scientists, and engineers to create their own transfer function using a polynomial expression.  For those not so inclined, there is a plentiful assortment of presets to choose from. 
Spectral Filter This filter allows you to create a very high-resolution frequency response contour using up to 32,000 bands of equalization by using FFT techniques.  The user interface system is intuitive and allows you to zoom-in on a particular portion of the spectrum that needs accurate and specific frequency response contouring. By using the right mouse button, you can add bands, or delete them simply by pointing and clicking on the graph.  This is very useful in Forensic audio applications for removing in-band and out-of-band extraneous noises because of its high degree of frequency selectivity and its very steep slope characteristic.
Spectrogram A Spectrogram provides a method for displaying waveform data including Time, Frequency and Intensity all on the same graph.  Time is represented on the horizontal (X) axis, frequency is represented on the vertical (Y) axis, while intensity (loudness) is represented by color or gray scale. The Spectrograph displays itself in the Destination window when this is checked.  The Spectrogram is calculated for whatever waveform is displayed, highlighted and zoomed in on in the Source window and is time aligned with the same.
DeClipper The De-Clipper can be used to repair signals, which were either clipped by digital or analog mechanisms.  It performs its magic by detecting signals with very low or zero values of slope (user adjustable from 0 - 0.5) above a settable threshold amplitude value.  When this condition is detected, the routine mathematically interpolates a new signal and replaces the zero slope portion of the bad waveform with one containing curvature.
Flashback Recording Flashback is primarily designed to be used in real time intelligence gathering and Forensics surveillance situations.  It is a feature that allows you to go back and listen to something that you may have heard during real time operation of the software that may be of immediate interest and needs rapid clarification.
Dual Stream Recording In a world where all evidence is called into question...especially audio computer evidence, our software automatically logs an unedited raw version of your recording along with the enhanced version that you're using to gather intel.  You've always got a safe backup!
VOX Record Activation This feature allows the recorder to start and stop itself based on the presence or lack of presence on an audio input signal.  The recording activation process is triggered by signal level sensing as determined by your setting of the Trip Level control.  The record de-activation process is triggered by a combination of the signal level sensing system in conjunction with the Minimum Duration control setting.
Auto Date and Time Stamp By checking the box labeled Automatic VOX Time/date Stamp, Live will add a marker each time recording starts in VOX mode.  This is useful in remote location or surveillance recording.  By enabling this function, LIVE will record only when audio is actually present to be recorded and each recording event will be marked with the exact time and date of the individual recording.
Unlimited Recording Time Windows has an inherent 2 Gig limit for wave files.  This can be a problem for very long recordings.  With our products, the system automatically starts a new file every time the 2 gig limit is reached and never misses a beat.
Brick Wall Filter Very steep digital filters used to attenuate signals that are interfering with a poor quality audio signal.  These are FIR (Finite Impulse Response) filters that exhibit a very high degree of out of band attenuation.

 Choosing The Tools

For Audio Forensics, Enhanced Audio offers 2 choices.  DC LIVE/Forensics at $1399 and the DCVST Automatic Forensics Filter VST Plug-In at $399.  There's a brief summary below so you can better understand the differences in the two products.

DC LIVE/Forensics $1499

DCVST Automatic Forensics Filter- $399

30 Band Graphic EQ

Flashback LIVE Review.

Real Time Coefficient Display Added To The Adaptive Filter

Dual Stream Recording Added To LIVE Feed through  

Time Domain Adaptive Filter and Frequency Domain Adaptive Filter  

CD Ripping 

Turbo-Charged Algorithms 

Elimination of 2 Gig Windows Wave File Limit 

Audio Spectrograph 

Polynomial Filter

Spectral Filter (Up to 32,000 Band Graphic EQ)

Normalized Adaptive Filter

Live Log To Disk with Notation and Automatic Time Stamp

DeClipper

Spectral Subtraction Filter In Continuous Noise

Wave file to MP3 Conversion via popular encoders

Signal Triggered VOX Recording

Distortion Analyzer

Up to 192 kHz Sampling Rate Support 

More Info?

One Button Control

Based on the Popular AFDF Frequency Domain Adaptive filter contained within our Continuous Noise Filter

Delivers Realtime Results 

Easy To Use

Fast Results

Works with any VST audio program

Powerful filter automatically adapts to changing noise environment

No noise sample necessary

More Info?

Screen Shot

LIVE mode can be a wonderful tool for surveillance or other live monitoring.  An audio signal can be filtered and listened to while it is happening live.  Great for both law enforcement and military uses. Both processed and an unprocessed signals are recorded at the same time and a listener can even rewind to rehear a bit of audio even while live recording continues.   This screen shows you the MultiFilter in LIVE mode. 

An Educated Taste Test

How much of a difference can the Enhanced Audio products make in your audio life?  Why don't you try them for yourself?  We have demos and Getting started tutorial guides for both products listed below.  Download both the demo and the Getting Started Tutorial guide...the tutorials don't take a great deal of time, but they give you a fantastic idea just how powerful our products are.  

DC SIX

This demo will allow you to sample the world's best audio restoration/enhancement and editing product.  It will only record 1 minute of material and save has been disabled, but if you want a taste test of excellence...you'll get it here.

DC SIX Getting Started Guide Easily navigate this product with a quick step by step tutorial that's completely "hands-on" and easy to read.  If you don't want the PDF to load into your explorer window, just right click on the link to the left and select Save Target As...

DC LIVE/Forensics Version 6.0

This is a latest and greatest product for Audio Forensics.  The demo is crippled in the following ways:

File length is limited to 1 minute total for any wave file.
The splash screen shows for 7 seconds, the real version only shows for 5, and can be dismissed with a click.
File saving has been disabled. Temp files, session files and file exports have been disabled.
Live Preview will work for 60 seconds total.
The help file is limited to program operation and some tutorials. The retail version comes with a 400 page printed manual
 
DC LIVE/Forensics 6.0 Getting Started GuideThis cool hand's-on guide will help you quickly and easily navigate DC LIVE Forensics.  The guide will help the most basic user but the results will impress even the most seasoned veteran.   If you don't want the PDF to load into your explorer window, just right click on the link to the left and select Save Target As...

We've provided  guides for both DC SIX and DC LIVE/Forensics.    The DC Six version help get you oriented with some traditional music projects, but then proceeds to forensic specific uses.  The Getting Started Guides are in PDF form and only depend on you using the demo versions of both products.  These tutorials do not take a great deal of time, but they are jam-packed with info and perfect for quickly learning both products.  These are PDF files and best viewed with Adobe Acrobat.  This is a free software product that you can download at www.download.com

Example Files

This type of noise can be found on typical forensics recordings.  You'll notice the success that DC LIVE/Forensics has in removing this noise.

Noisy Recording                After DC LIVE/Forensics
 
Note:  On some machines, you may notice a hesitation at the beginning of your MP3 files when you click on them.  If you just let it play and then listen to it again, the hesitation will go away.  If you're using a dial-up...it's probably best to download this files and listen once you've downloaded.  
 

Training, Training, Training

No one is born an expert on Audio Forensics.  This is the reason why we have annual 3 day training courses scheduled throughout the year.  Not only does this course focus on the intricacies of our DC LIVE/Forensics product, but it also deals with gathering evidence, storing evidence and preserving the chain of evidence so that you have full confidence in your output should you ever need to testify in court.  If you are interested in being considered for these courses, you can click here for additional information or email us at sales@enhancedaudio.com so that we can email you when we schedule our next training.

Will I Need Anything Else?

If you have DC LIVE/Forensics and a reasonably good sound card, you have an audio lab that will compete with any audio setup...even if your competitor had a much larger budget.  These products are powerful and most importantly, flexible.  

 

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Automatic Forensics Adaptive Filter VST Plug-In

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Virtual Valve Tube Simulation VST Plug-In

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DC 8 Software Training DVD

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Our resident software guru comes into your home via our DVD and walks you through tips and tricks for maximizing the quality and speed of your restoration results.  You'll be amazed at what you can learn in 2 hours.

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This detailed introduction to the Zen of Audio Restoration features a beginner's guide to restoration software.  Make the most of your restoration software

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DC LIVE/Forensics

There is simply no better Audio Forensics product on the market.  You can pay thousands more, but if you're clarifying noisy recordings or even running live audio surveillance, DC LIVE/Forensics is the best in the business.  $1499

Advanced Forensics Concepts Using DC LIVE/Forensics DVD

The in depth walkthrough covers all of the great new features of DC/LIVE/Forensics 7.5.  $59

Audio Mentor

New Price $29!

This intelligent wizard helps any user instantly achieve spectacular results.  Mentor takes you by the hand and gets you from the Record or Tape to CD in several painless steps.  

Learning The CNF DVD

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Diamond Cut Millennium

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Computer Transfer Preamps

New thinking for your vinyl restoration.  These preamps give you the most accurate reproduction off of your record that is available...at a price you won't believe

Automatic Forensics Adaptive Filter VST Plug-In

Now you can get one of DC LIVE/Forensics most powerful automatic adaptive filters and plug it into the software of your choice.  This cool new VST plug automatically removes noise so that you can find a voice buried beneath the muck.  Only $399

Virtual Valve Tube Simulation VST Plug-In

Add real tube sound to any music file an instantly add the warmth and depth that only real tubes can provide.  This new VST Plug In is useful in so many ways that you'll instantly find it your favorite plug-in.  Only $99

Call Us Toll Free At 866 260 6376  EnhancedAudio.com PO Box 189 Windsor, PA  17366  Sales@Enhancedaudio.com