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DSP presets
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THX Cinema
The THX Cinema DSP preset provides Pro Logic decoding,
followed by additional signal processing refinements developed
by Lucasfilm Ltd.
The THX extensions to Pro Logic decoding are designed to
provide a better match between the sound of the movie theatre
and a home cinema in the following ways:
❍The front channels are re-equalised to correct for the higher
treble often found in film soundtracks.
❍The surround channels are frequency-corrected using a
timbre-matching process so that sounds moving front–back
are more convincing.
❍The surround channels are decorrelated to break up any
artificial localisation of the rear signals due to the speakers
being nearby. In the 561 Digital Surround Controller this
decorrelation is optimised to give spacious surround sound
that has no artefacts disturbing to music or other sensitive
sounds in the mix.
❍The time synchronisation between loudspeakers is adjusted to
compensate for the fact that the speakers in a home system
tend to be a lot closer to the listener than in a movie theatre.
THX can also be used with the 5.1 Movie DSP presets; see
Dolby Digital THX, DTS THX, and MPEG THX, page 42.
Pro Logic and THX Cinema DSP
preset parameters
Parameter Options What it changes
Mono Rear Steered Rear, Which of the surround
Steered Side, channels are generated
Steered All, by steering. Mono gives
Mono All, conventional Pro Logic
Mono Rear, surrounds. Steered
Mono Side gives stereo surrounds.
TV Logic
TV Logic is a logic preset, with user-adjustable steering, that
can give higher intelligibility and a more appropriate spatial
presentation for studio-based TV material.