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CEDAR Forensic

 
     
 
Forensic™
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!!Australia Only!!

In addition to all the standard facilities of CEDAR Cambridge, CEDAR's forensic systems incorporate multiple Adaptive Filters designed specifically for use in audio forensic investigation, integrating them into a single, user-friendly environment for maximum speed and ease of use. Together with a Process Manager that includes an Internal Sample Rate selector, 2-channel tools, and perhaps the most powerful spectrum analyser offered outside of a dedicated audio analyser, these systems offer all the fundamental tools required for noise cancellation and speech enhancement in the fields of law enforcement, covert surveillance and terrorism countermeasures.

A range of configurations are offered, and introductory systems can be expanded quickly and easily to include facilities such as CEDAR's award-winning Dialogue Noise Suppressor, the advanced NR-5™ noise reduction system, precision EQ, Declickle™ for removing all manner of clicks and crackle, Debuzz and Declip, as well as 'spot' processes such as Dethump and Retouch.

The Forensic Audio Modules
There are five dedicated CEDAR Cambridge forensic processing modules in the Adaptive Filter pack, and they represent a significant upgrade on previous systems. Introducing CEDAR's proprietary Out Of Band capability, these filters allow users to retain much more of the energy associated with sibilants and fricatives to maximise the intelligibility of the speech. This makes them far more effective than those that analyse and filter the whole signal in a single frequency band.

CEDAR Forensic Systems allow you to launch and manipulate multiple processes simultaneously, either applying multiple analysers and filters to each signal, or applying individual processes to each channel. This is particularly useful when using the full system, where you may apply multiple noise reduction systems, adaptive filters, declickers, debuzzers, declippers, EQs and analysers in a single pass. All the processes offer advanced graphic tools, visual feedback, and save/recall capabilities that allow you to save your settings, create reports, and recall setups for future reference.

Products

Adaptive Filter
Adaptive Lattice
Time Align
Cross Channel Adaptive Filter
Cross Channel Adaptive Lattice

 

 
 
   
 

CAM10 - module 1: Adaptive Filter

   
         
  Adaptive Filter
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Designed to remove noise from monophonic signals, this offers filter lengths of up to 100,000 taps (although processing constraints may limit the number actually achievable) with user control of the length up to one second. There are user controlled Attack and Release constants, and the filter coefficients are displayed graphically to help the user determine the optimum settings for each job.

There are two output modes provided: the predicted signal, and the filtered signal. You can vary the output mix between the original audio and either of these to maximise the intelligibility of the result.

The Adaptive Filter removes many forms of interference and background noise, making speech signals more listenable and more intelligible, aiding transcription and making recordings more presentable for the courtroom and juries.

 
 
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CAM10 - module 2: Adaptive Lattice

   
         
  Adaptive Lattice
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  A more powerful filter than the Adaptive Filter, the Lattice Filter digs deeper into a noisy recording and is capable of extracting more fricative sounds and consonants that would otherwise be buried in broadband noise.  
 
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CAM10 - module 3: Time Align

   
         
  Time Align
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When using multi-channel adaptive noise cancellation, it is important that the reference channel and surveillance channel are correctly aligned. If they are not, you will be unable to extract the speech with optimal intelligibility.

The CEDAR Time Align module provides precise visual feedback about the relationship between (up to) eight reference and surveillance signals, and allows the user to align them to any one of the reference signals with an accuracy of 1ms.

 
 
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CAM10 - module 4: Cross Channel Adaptive Filter

 
         
  Adaptive Filter
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Unlike other two-channel subtractive filter systems, CEDAR Cambridge™ offers up to eight audio channels, allowing you to use the reference signal to clean up to seven other signals simultaneously.

All the controls of the single channel Adaptive Filter are provided, so the user can optimise the noise cancellation for each job. Using the Cross Channel Adaptive Filter, you can eliminate the masking effects of televisions, radio broadcasts and other measures used to obscure conversations.

 
 
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CAM10 - module 5: Cross Channel Adaptive Lattice

 
         
  Adaptive Lattice
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The most powerful of CEDAR's adaptive filters, the Cross Channel Lattice Filter achieves remarkable results, making voices clearly audible and intelligible even when they are barely apparent in the original audio.

 
 
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