---

Overview: CEDAR Forensic Systems – version 2 CEDAR Cambridge Forensic Systems incorporate four improved 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, the Standard System offers all the fundamental tools required for noise cancellation and noise elimination in the fields of law enforcement, covert surveillance and terrorism countermeasures The Standard Forensic System is expandable to the full 'Expanded' System, which also incorporates CEDAR's award-winning Dialogue Noise Suppressor, the advanced NR-5™ noise reduction system, a precision IIR EQ module, Declickle™ for removing all manner of clicks and crackle, plus Debuzz and Declip, which remove many forms of buzz, hum, and clipping distortion.

The Host System

CEDAR Cambridge ‘Q’ is pre-configured in a dedicated, rugged 4U rackmount host. This hugely powerful 4-core processing system is specified for rugged forensic use, and is supplied complete with multi-channel I/O installed, plus all software and drivers tested for your precise configuration.

The Process Manager

The forensic modules are hosted by a new Process Manager that handles sample rates from 8kHz to 100kHz and word lengths from 8-bit to 24-bit. This allows the user to match the internal signal and the processing bandwidth to that of the source recording, enabling greater filter lengths for improved frequency resolution. This in turn ensures more precise noise removal and gives you the best opportunity to improve listenability and speech intelligibility.

The File Processor

CEDAR Cambridge V5.1 boasts disk-to-disk and disk-to-world File Processing capabilities. These allow users to analyse and process selected parts of, or whole WAV, WAV 64, and AIFF files, rendering the results back to hard disk (disk-to-disk) in a fraction of the time needed to process audio in real-time. Furthermore, you can use the File Processor as a disk-to-world system, passing WAV, WAV64 and AIFF files through the processing chain and outputting the results so that you can monitor them in real-time.

The File Processor now hosts a multi-channel audio recorder capable of recording from one to eight channels simultaneously at sample rates of up to 96kHz. You may record over existing audio, append to existing audio, or create new files from incoming audio. It is also possible to record from a external timecode source, with the recorder cursor tracking the incoming timecode and recording audio that is determined by the timecode signal.

The File Processor is able to insert, manipulate and respond to automation events, thus allowing you to set up complex event- and scene- based processing, with morphing if required. It also hosts three off-line processes - Manual Declick, Dethump and Retouch 4™ - helping to make even the most intractable of problems quick and simple to rectify. To aid this, CEDAR Cambridge v4 and onwards has Time Markers that allow you to identify and move to audio events at the touch of a key.

The Timecode Automation Controller

The dedicated timecode reader/generator ensures that processed audio always remains aligned to video, so that all CEDAR Cambridge Forensic Systems will work in harmony with other audio or video surveillance. It also provides facilities for full automation of all the forensic systems' processing parameters.

Audio Modules - version 2

There are five dedicated CEDAR Cambridge forensic processing modules. All offer advanced graphic tools, visual feedback, and save/recall capabilities that allow you to save your settings and recall them for future reference.

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 Forensic System, where you may apply multiple noise reduction systems, adaptive filters, declickers, debuzzers, declippers, EQs and analysers in a single real-time pass.

Why "version 2" ?

Version 2 of CEDAR’s Adaptive Filter Pack represents 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 CEDAR’s adaptive filters far more effective than those that analyse and filter the whole signal in a single frequency band.

The Adaptive Filter Pack v2 is a free upgrade for all existing owners of the Adaptive Filter Pack, and is fully compatible with all versions of CEDAR Cambridge hardware.

Further information

Click on the links below to obtain more detailed information about each of the forensic modules. You can find information about the spectrum analyser, 2-channel tools, and all other CEDAR Cambridge™ modules here.