3Com CP-1 Program Parameters contd Auto Azimuth, Balance, Bass Blend, Rear Effect, Calibrate

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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. This automatic feature is why the CP-

 

1 does not have or need a front-panel input balance control for Dolby

 

Surround decoding.

Bass Blend

BASS BLEND takes the low bass from the center, where it is in many film

 

and music mixes, and distributes it instead to the left and right front-

 

channel speakers. Its initial value is 0 in the Stereo Logic program and 6 in

 

Pro Logic. This is valuable because in many video installations the center

 

speaker is smaller than the two main stereo speakers and is, therefore, less

 

capable of handling the lowest frequencies.

Front Effect/ The essence of the Dolby PRO LOGIC circuit is that dialog, music and sound

Rear Effect

effects are dynamically directed to the output channels, a process called

 

steering. The FRONT EFFECT and REAR EFFECT parameters in Stereo

 

Logic allow you to adjust the amount of this steering. Both are preset for

 

their maximum values in PRO LOGIC. In STEREO LOGIC, FRONT

 

EFFECT has a default value of 8, which is equivalent to 6 dB of steering; at

 

this level, central (monaural) sources are reduced in level by 6 dB in the main

 

stereo speakers. With FRONT and REAR EFFECT both set to 0, STEREO

 

LOGIC becomes the equivalent of a simple non-steered Dolby Surround

 

decoder. If you have no rear speakers, REAR EFFECT should be set to 0. The

 

CP-1 will set this parameter automatically when you specify a speaker

 

configuration with no rear channels. (See page 13.)

Rear Noise Chip

Dolby Surround decoding specifications call for a special form of Dolby B-

 

type noise reduction. Because STEREO LOGIC is also meant for music, the

 

rear-channel sound has more flexibility, including REAR NOISE CHIP, a

 

parameter that allows you to turn this Dolby NR circuit off.

Calibrate

The CALIBRATE mode in Stereo Logic and Pro Logic is for setting up and

 

checking the levels of the channels in multi-speaker systems. Its use is

 

covered in the section on Balancing Additional Channels on page 10.

Set Program Name/

The procedures for naming a new version of the program (SET PROGRAM

Memorize Program

NAME) and storing it in one of the User registers (MEMORIZE PROGRAM)

 

are described on page 29.

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Contents CP-1 Digital Audio Environment Processor Owners ManualPanorama Ambience Reverb SurroundAcknowledgements PrecautionsUnpacking and Inspection Safety Suggestions Table of Contents Controls IntroductionSource Monitor Controls IndicatorsFront Panel Rear Panel InputsPanorama Remote ControlPrograms Volume BankParameter EffectControls Indicators Installation PrecautionsConnection Calibration Connections to Other EquipmentAudio Inputs Connecting the CP-1 in a Tape Monitor LoopConnection and Calibration Setting Main Input Output Levels Front Panel AdjustmentsConnection Calibration Input LevelsOutput Levels Balancing Additional ChannelsCalibration of the Panorama Program Silence Noise Speaker Configurations Speaker Set-Up ConfigurationConfiguration Speaker Set-Up Configuration For FilmSpeaker Set-Up Configuration For Music Speaker Set-Up Configuration Speaker Set-Up Configuration To Load, Modify and Store Programs Using the 4 ProgramsTest Mode Panorama Program ParametersRear Level Rear Delay Effect LevelInput Balance Listener PositionAmbience Room Shape LivenessPrograms Ambience Reverb Pre-Delay Mid RTBass RT TrebleSurround Program Parameters Mono LogicStereo Logic Pro LogicProgram Parameters contd Auto Azimuth BalanceBass Blend Rear EffectUsing Programs Restoring Original SettingsTo Rename and Store a Register Naming a RegisterUsing Programs Problem TroubleshootingTroubleshooting Troubleshooting Restoring defaults Troubleshooting Concert Hall Acoustics Theory DesignLateral Sound Theory and Design Lateral Sound in your Listening EnvironmentTheory DesignAmbience Extraction Ambience GenerationPanorama Program Theory Design Theory and Design Ambience Program Be the sound that comes from the sides Reverb Program Surround Programs Mono LogicPro Logic Dolby Surround Decoding Pro Logic DecodingCP-1 Decoder Stereo Logic Speaker Set-Ups for Pro Logic Theory and Design References Theory and Design Optional Equipment SpecificationsFrequency Response 06/00 Lexicon 070-06619 Rev