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Meridian 861 Manual

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PREFACE
36
DSP PRESETS
DSP presets for two-channel
material
The digital surround controller provides several signal processing options
for two-channel material. The Music DSP presets are designed for use with
music from sources such as CD, radio, or two channel DVD-A:
• Music, Trifi eld, Ambisonics, Super Stereo, Music Logic, PLIIx Music,
Stereo, and Direct.
The Logic DSP presets are designed for use with fi lm soundtracks or TV
programmes:
• PLIIx Movie, PLIIx THX, TV Logic, and Mono.
The Music and Logic DSP presets use the Music and Logic speaker layout
respectively; see Speaker layouts, page 4.
Music
The Music DSP preset extracts the mono and surround components of the
original recording. These components provide an alternative representation
of the original sound, and this is sometimes used for recording systems or
in broadcasts such as FM radio. The mono element is equalised using a
proprietary Meridian technique to match the tone colour of the centre
speaker, and to compensate for the fact that the frequency response of
human hearing changes with direction.
The Music DSP preset is recommended for recordings made with spaced
omnidirectional microphones, or using a mono-surround technique.
Trifi eld
As for the Music DSP preset, the Trifi eld preset extracts the mono and
surround components of the original recording. It then calculates the
signals for the front, left, centre, and right speakers, using the phase and
amplitude differences between the three front channels, to redistribute the
sounds on a frequency-dependent basis.
This gives a signifi cant improvement over traditional stereo, which converts
the differences between the microphone signals into amplitude differences
in the speaker signals. This version of the Trifi eld algorithm is virtually
impossible to implement without digital signal processing.
Trifi eld is recommended for well-made recordings and stereo television
broadcasts that are not Dolby Surround encoded. An advantage over the
Music DSP preset is that the front stereo image is more focused, and the
width of the image can be adjusted.
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