Meridian Audio 565 Pro Logic and THX Cinema DSP preset parameters, TV Logic, DSP presets

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.

DSP presets

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