Related Manuals for Lexicon CP-1 - REV 1.0
Summary of Contents for Lexicon CP-1 - REV 1.0
- Page 1 Panorama Ambience Reverb Surround CP-1 Digital Audio Environment Processor Owner's Manual...
- Page 2 U.S. numbers 3,632,886, 3,746,792 and 3,959,590; Canadian numbers 1,004,603 and 1,037,877. "Dolby" and the double-D symbol are trademarks of Dolby Laboratories Licensing Corporation. Copyright 1988 All Rights Reserved. Patents are pending on the CP-1 Printed in the United States of America Lexicon Part #070-06619 Rev. 1.0...
-
Page 3: Table Of Contents
CP-1 Digital Audio Environment Processor Table of Contents 1 Controls and Indicators Introduction The Front Panel The Rear Panel The Remote Control 2 Connection and Calibration Installation Connections to Other Equipment Setting the Main Input and Output Levels Calibration of the Panorama Program 3 Speaker Set-Up and Configuration 4 Using The Programs... -
Page 4: Controls And Indicators
Controls Indicators CP-1 Digital Audio Environment Processor All of the programs in the Lexicon CP-1 Digital Audio Environment Introduction 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. -
Page 5: The Front Panel
Controls and Indicators Lexicon The Front Panel exicon DIGITAL AUDIO ENVIRONMENT PROCESSOR CP-1 SOURCE TAPE POST SYSTEM EFFECT POWER MUTE MUTE INPUT LEVEL TITLE: dlby lgo 2 CREATOR: Adobe Illustrator(TM) 1.1 SOURCE MONITOR TAPE CR DATE: 6/20/88 3:52 PM Source The SOURCE buttons select one of two identical stereo pairs of audio inputs. -
Page 6: The Rear Panel
Controls and Indicators CP-1 Digital Audio Environment Processor The Rear Panel LEVEL TAPE TAPE REAR SIDE MAIN CENTER INPUTS CENTER/OUT PHANTOM/IN OUTPUTS SUB WOOFER Stereo outputs for rear and side power amplifiers, with level adjusting Rear and Side knobs. The procedure for balancing these outputs (as well as the center Outputs channel and subwoofer) with the main pair begins on page 9. -
Page 7: The Remote Control
Controls and Indicators Lexicon The Remote Control PANORAMA BANK NORMAL WIDE BINAURAL AMBIENCE PARAM MEDIUM LARGE SMALL REVERB SMALL MEDIUM LARGE SURROUND MONO STEREO EFFECT BALANCE VOLUME SYSTEM EFFECT TITLE: dlby lgo 2 DOLBY SURROUND CREATOR: Adobe Illustrator(TM) 1.1 MUTE... - Page 8 Controls and Indicators CP-1 Digital Audio Environment Processor Surround The SURROUND programs work with film sound tracks to recreate the theater experience. MONOLOGIC (10) expands the music and effects on monaural films into the additional channels while leaving the dialog in the front center.
-
Page 9: Connection And Calibration
Installation The CP-1 may be installed on a shelf or in a standard 19" equipment rack, using the optional rack-mounting hardware (Lexicon part #021-06639). Connect the power cord to a wall outlet or to a switched outlet on the back of your preamplifier. - Page 10 Connection Calibration Lexicon Turn off ALL audio and video components, including individual power amplifiers. (Unplug any preamps and power amps that don’t have switches.) Locate the gain trim potentiometers on the rear panel of the CP- 1; these are knobs at the top of the panel, marked REAR, SIDE, MAIN, CENTER and SUB.
-
Page 11: Setting The Main Input
Level. Turn on the CP-1. For the first two seconds the display should read: LEXICON CP-1, with a software version number and a copyright notice. For another two seconds there will be a configuration message, then a program name will appear. When the power-up routine is finished, aim the remote control at the unit and push the EFFECT MUTE button (bottom row, right). -
Page 12: Calibration Of The Panorama Program
Connection Calibration Lexicon Balancing If you are using only two audio channels, level adjustment is now complete. If you have additional channels, use the following procedure to set their Additional Channels levels to match the main stereo pair. 1. Select 2.Push Param to... - Page 13 Connection Calibration CP-1 Digital Audio Environment Processor carpets and drapes) or diffusion (furniture or books that form irregular Select Panorama; Push PARAM to surfaces and break up reflections) and time spent shifting speakers and display: CALIBRATE; then push chair into more precise alignment (use a tape measure rather than relying Param UP to: ON LEFT ONLY.
-
Page 14: Speaker Set-Up And Configuration
Speaker Set-Up and Configuration CP-1 Digital Audio Environment Processor Configuration Choose the diagram from the Speaker Configuration Chart that corre- sponds to your room and note its number. Press the BANK button and hold it for a few seconds. The display will read: LCD CONTRAST ADJ with a bright bar. - Page 15 Speaker Set-Up and Configuration Lexicon Notes on Speaker The CP-1’s Configuration routine allows a wide range of choices in speaker and room set-ups to maintain optimal performance as your system ex- Placement pands. If you are starting with a conventional two-channel system, in what order should you add additional channels? The answer depends on whether you are primarily interested in audio or video.
- Page 16 Speaker Set-Up and Configuration CP-1 Digital Audio Environment Processor For Music If your main interest is music, you will most likely begin with two high- quality main speakers (Configuration 1). Here the Panorama program Center Phantom alone will add substantial enhancement in spatial impression, image size, Button IN image depth and freedom from coloration of central sources.
-
Page 17: Using The Programs
Using the Programs CP-1 Digital Audio Environment Processor To Load, Modify and The CP-1 contains four basic programs: Panorama, Ambience, Reverb and Surround. Each program has three variations which occupy one row on the Store Programs remote control. Pushing one of the buttons numbered 1 through 12 during normal opera- To load a program: tion will load that program. -
Page 18: The Programs
The Programs: Panorama Lexicon Panorama Panorama extracts the natural ambience from recorded music and moves it outward from the speakers, producing greater width and depth of image and a feeling of enhanced spaciousness. The program adds no additional sound but expands the existing stereo image. Panorama also works with Dolby Stereo movies, bringing the surround track outward into the room. - Page 19 The Programs: Panorama CP-1 Digital Audio Environment Processor EFFECT LEVEL sets the amount of crosstalk cancellation, and thus the Effect Level apparent front width. It is the most important user adjustment to Panorama, and has been given its own button on the remote. When EFFECT LEVEL is all the way down, Input Balance, LF Width and the rear outputs are still active.
-
Page 20: Ambience
The Programs: Ambience Lexicon Ambience Ambience generates the appropriate early reflections for stereo simulation of one of six different halls — one rectangular hall and one fan-shaped hall in small, medium and large sizes — and sends the reflections to the side and rear speakers. - Page 21 The Programs: Ambience CP-1 Digital Audio Environment Processor ROLLOFF mimics the absorption of the air in the hall and its initial value is Rolloff therefore more pronounced (the rolloff begins at a lower frequency) the larger the space. PANORAMA EFFECT adjusts the strength of the signal used to expand the Panorama Effect stereo image outward from the front two speakers.
-
Page 22: Reverb
The Programs: Reverb Lexicon Reverb The Reverberation program differs from Ambience in that it does not simulate the early reflections of specific halls, but emphasizes rich, smooth reverberant decay in small, medium or large spaces. It works well for simulating a space with a long reverberation times relative to its size, such as a reverberant chamber, church or the like. - Page 23 The Programs: Reverb CP-1 Digital Audio Environment Processor MID RT (Midrange Reverberation Time) is the time required for midrange Mid RT sounds to decay 60 dB in level. Your choice of small, medium or large synthesized space determines both the initial value and the available range of MID RT.
- Page 24 STEREO LOGIC is meant for playing music through a system whose speakers are laid out primarily for films. PRO LOGIC is Lexicon’s all-digital implementation of the Dolby Pro Logic Surround decoding process. The term Dolby Stereo refers to both movies and equipment used exclusively for theatrical presentation.
- Page 25 The Programs: Surround CP-1 Digital Audio Environment Processor Stereo Logic Parameter Initial Value Range FRONT EFFECT 0-16 REAR EFFECT 0-16 REAR ROLLOFF 14.1 kHz 329 Hz-14.1 kHz Automatic BASS BLEND 0-16 AUTO AZIMUTH/BAL Off, On REAR DELAY 8 ms 0-32 ms REAR NOISE CHIP Off, On CALIBRATE...
- Page 26 The Programs: Surround Lexicon Program Parameters cont'd Auto Azimuth/ The AUTO AZIMUTH/BAL parameter should be set to ON for films, OFF Balance for music. When it is on, special digital circuits continually monitor the dialog and adjust both the relative level and time offset of the two channels to keep the dialog properly centered.
-
Page 27: To Rename And Store A Register
Using the Programs CP-1 Digital Audio Environment Processor To Rename and Store a Register The previous sections describe the CP-1’s four basic programs and all of their variable parameters. Any changes in the parameters of a program in the USER bank will be automatically recorded and stored for future use. USER banks store automatically. -
Page 28: Troubleshooting
Configuration settings, since they will have been reset to factory defaults.) If you cannot solve functional problems through these procedures, consult your dealer or Lexicon/Customer Service Department. DO NOT, UNDER ANY CIRCUMSTANCES, OPEN THE UNIT. DOING SO WILL VOID YOUR WARRANTY, AND MODIFICATIONS MAY RENDER THE UNIT UNSERVICEABLE. -
Page 29: Theory And Design
Theory Design CP-1 Digital Audio Environment Processor Lateral Sound Concert Hall Acoustics For decades the study of concert-hall acoustics relied on certain basic measurements to characterize halls, the main one being the time it takes a sound to drop in level (decay) by 60 decibels. This is called the reverberation time or RT and is approximately the same as the time it takes a hand clap to subside to inaudibility. - Page 30 In an ordinary room, the room supplies these The Lexicon CP-1 resolves this deficiency by supplying appropriate signals directions, and the sound is cramped, but tol- to loudspeakers at the sides of the listener or by modifying signals to the erable.
- Page 31 Theory Design CP-1 Digital Audio Environment Processor sides. Both methods depend on having the added sound come from a different direction than the original music, and each method has some advantages. With either method of generating SI there is an additional choice the CP-1 allows the user to make: the sideways energy cues of the original recording can be extracted by the CP-1, or a different hall sound can be generated and supplied from the correct directions.
- Page 32 Theory Design Lexicon The Panorama Program Loudspeakers placed on either side of the listening position are the most effective and foolproof way to produce added Spatial Impression. Since it is not always possible to have side loudspeakers, the CP-1 uses crosstalk elimination to simulate them when they can’t physically be there.
- Page 33 Design CP-1 Digital Audio Environment Processor quency. Lexicon’s implementation, called the Panorama program, was designed using measured data on sound diffraction around the head to shape the frequency spectrum of the canceling signal. This signal is then itself canceled by a second signal, and so on, so that both the crosstalk and the...
- Page 34 Theory Design Lexicon In a well-damped room with loudspeakers mounted on stands away from the walls, the Panorama effect can be very exciting, giving the closest possible approximation to the actual hall used for the recording. With true binaural recordings (made with a modern dummy head with accurate external ears and proper equalization) the playback can be uncannily realistic.
- Page 35 The reflections were determined by computer ray-tracing using architectural data, augmented by Lexicon’s 15 years of experience with digital concert-hall simulation. The Ambience simulation is done in stereo. Instead of feeding combined left and right channels to the processor, the CP-1 has two input points corre- sponding to instruments placed on the left or right side of the stage.
- Page 36 Theory Design Lexicon be the sound that comes from the sides. Early research with quadraphonics involved extensive experimentation with speaker placement, and confirmed that additional speakers beside the listener sounded better than the conventional approach of putting pairs of speakers in front and behind. Our research into speaker placement with...
- Page 37 Theory Design CP-1 Digital Audio Environment Processor music. If you have no side loudspeakers, both Ambience and Reverb contain versions of the Panorama program that will simulate them within a narrow area between the speakers. Choosing one of the speaker configurations with no side speakers (see page 13) will automatically turn the Panorama Effect on and mix the side outputs into the main outputs.
- Page 38 Theory Design Lexicon The Surround sides to the front, while leaving the side outputs on.) Programs The Surround programs: Mono Logic, Stereo Logic and Pro Logic, are specifically designed for film sound or for systems set up primarily for Mono Logic enhanced film viewing.
- Page 39 Theory Design CP-1 Digital Audio Environment Processor room simulator has outputs for left, right, side and rear surround speakers. The monaural input sound from the film is unchanged in the center speaker, so that all the dialog and music that the director expected to come from the screen still does, with no modification or reverb.
- Page 40 Theory Design Lexicon placements. Dolby Surround Decoding When the movie is shown the two Dolby Stereo tracks must be decoded and separated into the original four. The Dolby Surround decoder does this in a rather rudimentary way: it supplies a signal to the center channel which is just the sum of the two input channels.
- Page 41 Theory Design CP-1 Digital Audio Environment Processor is even more important in a home decoder than in a professional model, because the small size of the playback room makes decoding errors more audible than they are in a theater. The level detection must be very fast, and the matrix must adapt very quickly or there will be a time lag between the audibility of a sound and its correct steering.
- Page 42 Theory Design Lexicon checking balance and azimuth, keeping the dialog perfectly centered. The result is superior steering. An added benefit is that the CP-1 is the only Pro Logic decoder which needs no front panel input balance control; the user need not bother with this adjustment.
- Page 43 Theory Design CP-1 Digital Audio Environment Processor when there are rear speakers. When the Rear Effect is set to zero all rear sounds appear in the front left and right speakers (and the side left and right speakers, if present). The Rear Noise Chip parameter is preset to OFF, meaning that the high- frequency sound in the rear channels is set solely by the Rear Rolloff parameter.
- Page 44 Theory Design Lexicon surprising - lateral sound is known to grab our attention in a way that front sound does not. Occasional extra wide sound effects can seem peculiar at first for being so much wider than the screen but when the mix is good the emotional impact of the wide sound can be very great.
- Page 45 Theory Design CP-1 Digital Audio Environment Processor References 1. Schroeder, M.R., Gottlob, D. and Siebrasse, K.F.,"Comparative Study of European Concert Halls: Correlation of Subjective Preference with Geo- metric and Acoustic Parameters", J. Acoust. Soc. Am., vol. 56, pp. 1195-1204 (1974). 2.
-
Page 46: Specifications
85dB min, A-weighted, Ref. 1 kHz max level Voltage: 120V/60 Hz 100V/50-60 Hz 220V/50 Hz 240V/50 Hz Dimensions: 17"W x 12.5"D x 2.5"H 11 lbs. Weight: Optional Equipment: Rack-mount adapter, Lexicon Part# 021-06639 Patents are pending on the CP-1 Page 49... - Page 47 Lexicon, Inc. 3 Oak Park Bedford, MA 01730 Tel 781-280-0300 Fax 781-280-0490 Lexicon Part #070-06619 Rev. 1.0 Printed in the United States of America...