Lexicon CP-1 User Manual download pdf (Page 5)

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CP-1 Digital Audio Environment Processor

Introduction

Controls

and

Indicators

All of the programs in the Lexicon CP-1 Digital Audio Environment

Processor have a common goal: to draw you, the listener, more deeply into

a musical performance or a film. For music the CP-1 uses unique digital

processing to re-create either the original recording space or a new one of

your choosing. For films it offers an extremely accurate version of Dolby Pro

Logic Surround decoding and our own decoding for monaural film sound-

tracks. The increase in impact of a musical performance or film when heard

with the CP-1 is enormous, especially when widely spaced multiple loud-

speakers are provided, but even without additional loudspeakers signifi-

cant gains are made.

To re-create the experience of being at a performance the CP-1 draws on

recent studies of concert-hall acoustics, and applies this research to home

listening rooms. The object is to increase the sideways-moving sound in a

room, thus increasing Spatial Impression, or SI.

The CP-1 increases SI by either extracting it from the original recording,

using the Panorama or Surround programs, or by generating a new acoustic

environment with Ambience or Reverb.

When a listener is in the correct spot the Panorama program provides an

almost ideal re-creation of the original recording space. It works by using

digital processing to cancel the crosstalk between the listener's ears, effec-

tively spreading the sound from the two front loudspeakers in a wide arc in

front of the listener. With the optional addition of rear speakers, Panorama

can be almost spooky in its realism.

The CP-1 Reverb and Ambience programs provide signals for driving

widely spaced side and rear loudspeakers, directly exciting sideways

sound and heightening the listener impact over a large listening area.

(When there are no side speakers, Panorama is used to increase the side-

ways sound from the main speakers.)

The Ambience and Reverberation programs transform the listening room

into a new acoustic space, letting you choose an environment which

matches your music or your mood. Unlike some previous hall simulators,

the CP-1 provides full stereo processing. The Ambience program generates

the side and rear reflection patterns of idealized rooms and concert halls.

The larger spaces add the true depth and realism of a concert hall to classical

and popular music, while the smaller spaces are ideal for jazz and rock. The

Reverberation program is similar, but places more emphasis on rich, dense

reverberant decay than on early reflections. It is especially good for

simulating large, highly reverberant spaces.

For films encoded with Dolby Stereo, Lexicon has incorporated into the

CP-1 the first completely digital Dolby Pro Logic Surround decoder, and the

only one with automatic correction of azimuth and channel-balance errors

(the most common problems in currently available films). The CP-1 also

provides a program for playing music through a Surround speaker set-up

(Stereo Logic), and a program for expanding monaural film sound tracks

(Mono Logic).

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Lexicon CP-1 User Manual Page 5

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