Using the additive approach, UnWrap preserves the Left and Right channels bit transparent all the way down to the LSB of a 24 bit input. If the original stereo-mix is later requested, it can be obtained using only these two channels.

If subsequent down-mix capability using all the channels is essential, this option is available too. In both cases, the LFE channel can be fully exploited, omitted or anything in between, as can the Center.

Program related conversion options

It has been TC's goal to provide presets that can make any kind of program material present itself better and more engaging in 5.1 than in stereo. From old to recent pop and rock music, from unique classical recordings to highly ambient modern tracks, from ultra dry to wet source material, UnWrap comes with settings to complement it all.

Add to the default presets the capability to time-align all channels at sample precision, widen or narrow the image, control the amount of Center and LFE channel to be used, change filters and envelopes, and you begin to get an idea of the power behind this new algorithm.

Introduction

UnWrap in use

UnWrap measures phase, delay and spectral differences between a pair of stereo channels to create a 5.1 result. For different program material there will be different optimum settings that best represent the qualities put into the original mix.

Please familiarize yourself with the controls and parameter-ranges on known material before you attempt unwrapping new stuff.

Setting up

Try loading some of the UnWrap presets. You can A/B the process by pressing Bypass. You may also experiment for stereo compatibility using the downmix levels on the D- MIX page.

Time alignment

When all Delays are set at "0", all Outputs from UnWrap are aligned with sample precision. The basic Delay through the algorithm in this case is 3.6 ms at 44.1 and 48kHz. Try offsetting the Delays in samples and ms, and note the shift in image. Delays may be used...

-on the Surround channels to ensure that sounds appear to originate from the front speakers

-on the Center channel to compensate for its position

-on the LFE channel to compensate for speaker position or to advance/delay it for artistic reasons.

When the front channels are not assigned the same Delay, please note that a subsequent stereo down-mix may not work so well. Use the downmix function accessible via the Downmix page to compare processed and unprocessed material.

E N G L I S H

UNWRAP -TDM /3

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TC electronic SDN BHD Home Stereo System manual Introduction, Program related conversion options, UnWrap in use, Setting up