Software dbx-I Compatible Compander

 
   
   
  DxI Codec is a modern digital equivalent of the traditional dbx-I noise reduction system for RtR (reel-to-reel) analog audio tape. The software is capable of decoding/encoding dbx-I formatted audio in digital domain without needing a dedicated analog hardware decoder/encoder. Benefiting from the proprietary DSP engine and the concise GUI, the task can be accomplished in realtime with intuitive user interaction, or more swifty with the batch processor.
 
     
 
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The software is able to adapt to different tape EQ standards. The built-in dedicated converter can easily translate audio material between CCIR/IEC1 and NAB/IEC2 specifications at different tape speeds. Aided by this converter, EQ mismatch is no longer a problem. It also allows a single-standard RtR machine being virtually used as a dual-standard one.

Dynamic range (DR) mismatch is another caveat in using high-ratio companders like dbx NR, which includes potential DR underload in compressing process and the potential DR overload in expanding process. The concern is addressed by the app with a novel dual-meter display that visualizes the potential DR mismatch, along with a threshold slider for instant correction.

As a new digital re-implementation of dbx-I NR, the software allows the traditional dbx NR encoding/decoding tasks to be able to benefit from the gifted digital advantages, such as: zero new noise, mathematical accuracy, maintenance-free and very low cost. The digital codec's tracking speed is also adjustable for some special needs, such as decoding an audio material that was pre-encoded by a drifted hardware dbx encoder. However, the software is not made as an upgrade of the original analog dbx-I system´╝îinstead´╝îbeing as closer as it is. The digital engine is designed with full respect to the original analog system's topology with the same 2:1 pre-emphasized compression and the same 1:2 de-emphasized expansion which are controlled by the true RMS level detector with the same capacitive timing characteristics, even not attempted to "fix" the inherent side-effects such as "breathing" and intermodulation. It is just a new digital alternative that can accomplish the same traditional work with modern technology, without unnecessary improvements or compromises. For those who are transferring audio contents across the analog(A)/digital(D) border, the software is suitable for digitizing legacy tapes (A2D) or recording new tapes from bitstream (D2A). In case a dbx-I analog hardware unit is temporarily unacquirable or degraded, the software can serve as a similar role if double D/A A/D conversions are acceptable. And finally in dealing with pure digital archives (D2D), the software will make impossible possible.

DxI Codec is a stand-alone GUI app without relying on any other DAW host. It allows the computer to serve as an external(outboard) dbx-I/Disc compatible unit in one of the following four modes:

Input Output Comment
Audio In File a digitizer/recorder, with dbx-I/Disc codec
File Audio Out an audio file player, with dbx-I/Disc codec
File File an off-line dbx-I/Disc processor, with batch capability
Audio In Audio Out an on-line dbx-I/Disc processor, with slight delay

Currently supported audio file formats are:
WAV, FLAC, AIFF: up to 96k/24bit.
MP3, AAC, M4A: up to 48k/VBR.
* Excluding some proprietary variants having the common file extensions, or additional format-normalization may be required.

The software comes with embedded user manual on each major functions.

Please note that this software is suited for the Pro grade dbx type-I on reel-to-reel tape, which is not compatible with the consumer grade dbx type-II on cassette tape. However, it does come with an additional dbx type-Disc codec, which is suited for LP records.

 
     
     
     
   
     
     
   
     
   
     
   
   
     
 

 

dbx-I and dbx-Disc are the tape noise reduction systems developed by dbx Inc..

 
     
 
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Frequently Asked Questions (FAQ) Contact: anaxwaves@gmail.com