DDi Codec is a precise digital equivalent of Dolby-B/C analog tape noise reduction system. It is the world's first dedicated software capable of decoding or encoding Dolby-C formatted audio in digital domain, along with full backward compatibility to Dolby-B. Powered by the proprietary DSP engine, the decoding or encoding can be performed in real-time pace, which allows instant monitor and control of quality.

The software also comes with an unique set of fine-tuning tools for reducing tracking errors in practice. Deeper optimal result can be achieved by effectively using the tools, as specified below:

• The "Reference Vernier" is a novel widget for determining Dolby Reference Level in an interactive and progressive manner. It supports either objective calibration (with Dolby Tone) or subjective estimation (without Dolby Tone).
• The azimuth and gap-loss compensation tools are the digital efforts of remedy in compensating minor imperfection of an analog tape player used for digitizing audio tapes.
• The "Play Trim" is another digital tool for compensating weakened signal often found with a degraded pre-recorded tape.
• The EQ Converter offers digital translation between 120μs and 70μs IEC tape equalization formulas — if such a flexibility is not offered by a given tape player/recorder.
• The built-in tone generator offers 400Hz 0dB signal at Dolby Reference Level for easy calibration.

These fine-tuning tools can work independently of the Dolby-B/C codec, which can also be applied for refining non-Dolby formatted audio.

DDi Codec is a stand-alone GUI app without relying on any other DAW host. It let the computer perform as a outboard Dolby-B/C NR unit in one of the following 4 working modes:
• Audio-In to File (a digitizer/recorder).
• File to Audio-Out (a player).
• File to File (an off-line processor, with batch capability).
• Audio-In to Audio-Out (a through processor, with slight delay).

Currently supported audio formats are: WAV, MP3, FLAC, AIF, AAC and M4A, up to 96k/24bit.

* Dolby-B and C are the tape noise reduction systems developed by Dolby Laboratories.

What’s New

Version 2.0.0

Introduced batch process capability.

Ratings and Reviews

5.0 out of 5
1 Rating

1 Rating


Chen Wang
2.1 MB

OS X 10.10 or later, 64-bit processor



Age Rating
Rated 4+
© 2019 Anaxwaves


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