3Com CP-1 owner manual Stereo Logic

Page 52

Theory and Design

Lexicon

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. You can check the quality of the balance and azimuth in a tape or disc if you wish by turning the Auto Azimuth/Balance parameter off and observing any changes in the location of dialog and effects.

In addition, because the side and rear cancellation of dialog is unusually good even with poor material, you can use Stereo Logic to set the rear channel filtering higher than is recommended in the Pro Logic specifica- tions. This added surround brilliance makes some effects, such as falling rain all around you or objects zooming from rear to front, much more convincing. This feature should be used with caution, however, since in this mode the decoder is different from the one on which the film was mixed.

Stereo Logic

The Stereo Logic program is primarily designed for the playback of music through film-sound systems. Its basic structure is similar to Pro Logic but it contains more variable parameters. In the Preset version of Stereo Logic these parameters are set for music but they can be changed to produce a versatile program for film sound as well.

The range of the Rear Delay parameter is 0-32 ms, as opposed to 16-32 ms in Pro Logic, for use with music programs in which you may want to hear the front and rear outputs of the program simultaneously.

Music does not necessarily contain a crucial, centrally located element analogous to the dialog in films. So the Preset version of Stereo Logic has no automatic adjustment for interchannel time delay and balance (that is, the Auto Azimuth/Balance parameter is off). The Front Effect parameter, which controls the steering among the front three channels, is preset half way up, meaning that centrally located sounds are diminished by 6 dB in the side speakers and vice-versa. The setting for Dolby Stereo films is 16 (up all the way).

The Rear Effect parameter controls the steering of effects, music and ambient sounds to the rear speakers. Its preset value is determined by the speaker configuration specified by the user. (See page 13.) The preset value is zero if there are no rear speakers in your system and 8 (of a possible 16) when there are rear speakers. When the Rear Effect is set to zero all rear

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Contents CP-1 Digital Audio Environment Processor Owners ManualPanorama Ambience Reverb SurroundUnpacking and Inspection PrecautionsAcknowledgements Safety Suggestions Table of Contents Controls IntroductionFront Panel Controls IndicatorsSource Monitor Rear Panel InputsPrograms Remote ControlPanorama Volume BankParameter EffectControls Indicators Installation PrecautionsConnection Calibration Connections to Other EquipmentConnection and Calibration Connecting the CP-1 in a Tape Monitor LoopAudio Inputs Setting Main Input Output Levels Front Panel AdjustmentsConnection Calibration Input LevelsOutput Levels Balancing Additional ChannelsCalibration of the Panorama Program Silence Noise Configuration Speaker Set-Up ConfigurationSpeaker Configurations Speaker Set-Up Configuration For FilmSpeaker Set-Up Configuration For Music Speaker Set-Up Configuration Speaker Set-Up Configuration Test Mode Using the 4 ProgramsTo Load, Modify and Store Programs 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 Troubleshooting TroubleshootingProblem Troubleshooting Restoring defaults Troubleshooting Lateral Sound Theory DesignConcert Hall Acoustics 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 Frequency Response SpecificationsOptional Equipment 06/00 Lexicon 070-06619 Rev
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