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Dirac LiveCan I use ATMOS with Dirac? What about upfiring speakers vs ceiling speakers?
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Can I use ATMOS with Dirac? What about upfiring speakers vs ceiling speakers?

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ATMOS: Upfiring speakers vs ceiling speakers

Upfiring speakers behave differently than ceiling speakers in Dirac Live (if they have been properly labeled in the device).

The speaker type should be "DOLBY_ATMOS_SPEAKER" for upfiring speakers. This should trigger a pre-emphasis filter being applied on the device to the stimuli played through such a speaker.

The pre-emphasis filter is there to ensure that the special Dolby-patented target curve for such speakers is not "destroyed" by the Dirac Live filter design.

Basically, the pre-emphasis filter will hide the Dolby-filter from our measurements. This doesn't happen in Dirac Live, it happens on the device.

So if the device supports configuring a speaker as upfiring, then it should apply our defined pre-emphasis filter during the stimuli playback for Dirac Live measurements so that Dirac Live doesn't wash off the height effect.

There are two caveats, though:

  1. This functionality is not tested in our device certification.

  2. Dirac Live does not properly align the delay of the reflected (intended) wave as it instead alignes the direct wave.

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