Aria 51 - Stereo to Surround upconversion incorporating FRANCINSTIEN enhancement

The Aria 51 algorithm is intended for high-quality, adaptive stereo to 5.1 upconversion. Whilst there exist many alternative upconversion algorithms, Aria 51 is unique in that it uses the Center loudspeaker channel to implement FRANCINSTIEN correction. Whereas most stereo-to-5.1 conversion algorithms degrade stereo reproduction by applying a static (or dynamic) MONO signal to the Center channel, the Aria 51 algorithm actually improves standard stereo reproduction whilst adding the extra dimension of surround-sound.

The ARIA 51 algorithm is complemented by variations for 5.0 and 4.0 surround operation since these are often required for music stems and sub-mixes.

Aria 50 Surround

The Aria 50 algorithm is intended for high-quality, adaptive stereo to 5.0 up-conversion. Like ARIA 51, Aria 50 also uses the Center loudspeaker channel to implement FRANCINSTIEN correction. However, Aria 50 omits the extra LFE signal from the infra-bass of the incoming stereo present in the Aria 51 algorithm.

Aria 40 Surround

The Aria 40 algorithm is intended for high-quality, adaptive stereo to 4.0 up-conversion. This has applications in television especially because it leaves the Center channel silent for narration or dialogue. Aria 40 omits the extra LFE signal from the infra-bass of the incoming stereo present in the Aria 51 algorithm.

A stereo folddown of the 5.1 upmix is available too, this is termed Aria 20.

With all Aria Surround options, the input file should be simple, two-channel stereophonic file. The output may be selected as a multi-channel 5.1 file, as stereo WAV files (L/R, C/LFE or sL/sR), or as separate mono files (useful if you want to re-encode in DTS, for example).

Channel Correlation Coefficient (CCC)

Stereo Lab uses Principal Component Analysis (PCA) techniques to adjust the parameters applied to the stereo to 5.1 upconversion process. The Channel Correlation Coefficient is derived in this process and is viewed by right-clicking on a processed file and selecting "Copy Audio Metrics to Clipboard" from the context menu.


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© Pspatial Audio 2015 - 2017. All rights reserved. Apple Certified Developer. Stereo Lab, Aria 51, Aria 20, Head Space, Groove Sleuth, iLOOP and FRANCINSTIEN T-Sym are trademarks of Pspatial Audio. FRANCINSTIEN and Bride of FRANCINSTIEN (BoF) are trademarks of Phaedrus Audio. Macintosh and the Mac logo are trademarks of Apple Computer, Inc.