Dual-Chamb - Lexicon PCM 81 - REV 2 User Manual

Algorithms and Parameters
The following five Pitch FX algorithms: Dual-Chmb, Dual-Plt,
Dual-Inv, Stereo-Chmb and VSO-Chmb are created from 3
Reverb blocks and 3 Pitch Shift Effect blocks. The individual
reverb and effect blocks are described, followed by the
diagrams and matrixes and parameter descriptions for the
algorithms. Descriptions of the controls common to all of these
algorithms is presented in following section Using the
Submixer.

DUAL-CHAMB

This algorithm includes a dual pitch shifter combined with the
Chamber reverb. The pitch shifter has two voices. Each voice
has independent controls for pitch, level, delay, pan, feedback
and cross-feedback. The pitch of each voice is adjustable up or
down over a 3 octave range with a resolution of 1 cent.
Maximum delay time for each voice is 1.250 seconds.
The Chamber reverb
dimensionless reverberation, with little change in color as the
sound decays. The initial diffusion is similar to the Concert Hall
algorithm, but the sense of space and size is much less obvious.
This characteristic, along with the low color in the decay tail,
makes Chamber useful on a wide range of material. It is
especially useful on spoken voice, giving a noticeable increase
in loudness with very low coloration.
Note:
The Dual-Chamb parameter matrix is shown on
page 3-42.
3-36
produces an even, relatively
V1 X-Fbk
V1 Fbk
V1 Pitch
1
Delay
Delay
2
V2 Pitch
V2 Fbk
V2 X-Fbk
EkoFbk L
EkoDly L
RefDly L
Low Rt
Diffusion PreDelay Rt HC
Spin
RefDly R
EkoDly R
EkoFbk R
Dual Shifter
V1 Lvl
V1 Pan
V2 Lvl
V2 Pan
Chamber
RefLvl L
Mid Rt Crossover
Size Shape
Rvb Out
Spread Link
RefLvl R
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