CEDAR Trinity Overview

CEDAR Trinity 4 audio surveillance system

CEDAR Trinity is a suite of products designed for audio surveillance and related purposes that can perform audio recording, import of existing audio files, playback, speech enhancement, and annotation using a system of metadata notes. Depending upon the variant installed, it can monitor and record live feeds for days, weeks, months or even years, load existing audio files, replay and enhance all or any part of a recording, allow multiple users to access feeds and recordings using a local area network, log and transcribe events of interest while continuing live recording, export audio to .WAV files and audio CDs, and verify the integrity of any CEDAR Trinity project or archive for evidential purposes.

Three variants are available: CEDAR Trinity Recorder, CEDAR Trinity Satellite and CEDAR Trinity Off-line. These can be combined in different ways for various purposes. All three run on standard Windows PCs, laptops and tablets running Windows® 10. A fourth variant - CEDAR Trinity Workstation - includes all the facilities of the Recorder, Satellite and Off-line products.

The Recorder and its Satellites are designed primarily for recording, monitoring, enhancing and transcribing live audio feeds - in other words, performing all the tasks necessary to collect evidence while the event of interest is happening, and to provide immediate intelligence to rapid response teams. The Off-line system, as the name implies, has been designed for performing the same tasks on existing audio files. These can be supplied in a wide range of formats whether they were recorded on CEDAR Trinity or almost any other recording system.

Typical applications

Major features

Recorder Satellite Off-line Workstation
(Recorder + Satellite + Off-line)
Record unlimited channels    
Connect to Recorder  
Connect to Remote Recorders  
Support CEDAR Trinity Satellites    
Monitor live audio    
Load existing audio files    
Enhance live audio    
Enhance existing audio files    
Add metadata notes and transcriptions  
Export audio  
Archive audio    

CEDAR Trinity offers four powerful processes that suppress unwanted noise and enhance the wanted speech. These are based on flaghip processes such as our adaptive filters and FNR. They provide deceptively powerful and effective speech enhancement with the minimum of controls so that all users - novices and experts alike - can increase the intelligibility of audio collected from difficult environments.

The event log is a list of system events (such as record starts and stops) and user events (which can include information about the recording, the location, and the speakers, as well as a full transcription of the speech). Every user's ID is added invisibly to events, and the speech enhancement parameters are embedded as metadata in exports. For security and verification purposes, these allow investigators to know with even greater precision who did what, and when.

Archiving frees up disk space, even while the recording is progressing. This means that, in principle, a recording can continue indefinitely. Then, if you wish to restore the archived audio, it can be inserted seamlessly at its original position, allowing teams to revisit audio material at any time in the future. Archived audio can also be used to create new audio assets should this be required.

To comply with the law in a number of jurisdictions, CEDAR Trinity can erase audio from assets, although only under strict conditions, and with the system reporting that this has been done. Of course, this feature can also be precluded for use in countries where erasure is not allowed. Likewise, we have added a switch that allows incoming audio to be monitored when no recording is taking place or (for use in jurisdictions where this is not allowed) that mutes the feed unless recording is taking place.

For evidential purposes, CEDAR Trinity offers a separate verification utility that can check the integrity of any project or archive. Exports as well as assets and archives are now cryptographically signed so that users can use the TVerify utility to see whether anyone has tampered with the audio, whether held in assets, in exports of specific portions of the audio (say, for evidential purposes), or in archives. If no evidence of tampering is found, the information contained with the audio can then be used with confidence.


The CEDAR Trinity recorder is now Dante® compatible through the use of the Dante Virtual Soundcard. Its ability to transfer many channels of audio from input devices to the recorder using standard networks rather than large numbers of audio cables makes it easier and more cost effective to create larger CEDAR Trinity installations. Such systems are more robust than tradition audio cabling and can be used over much greater distances. This makes them particularly useful in environments such as central monitoring posts.


Training courses on all aspects of CEDAR Trinity 4.1 are offered at CEDAR Audio in the UK.

See the latest updates in CEDAR Trinity.

CEDAR Trinity - Pricing and availability

To enquire about the price and availability of CEDAR Trinity in your country or to arrange a demonstration, please provide your details below:

Contact Info


CEDAR Audio Ltd,
20 Home End, Fulbourn,
Cambridge, CB21 5BS, UK


+44 1223 881771

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