Meridian America Meridian 518 manual Overview as Resolution Enhancement Processor Type

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Overview of 518	10

Overview as Resolution Enhancement Processor (Type 1)

There are a wide number of applications for this mode of 518: three examples are described.

CD or LaserDisc playback improvement

Many installations use the 2-box CD player format of CD transport + DAC. The CD transport provides a digital output, and of course may be a normal CD player where the digital output is used to drive an outboard DAC to improve the quality.

This CD playback system may then have its analogue output connected to a preamp or integrated amplifier in the usual way.

CD Player

LaserDisc

518

Analogue inputs

DAC			Preamp
DAC			Preamp

Using 518 as part of CD playback

The diagram above illustrates how 518 is added to such a system. The picture shows that the source could be a CD transport, a LaserDisc player or both.3

The 518 provides two resolution enhancement methods: de-jittering via the twin PLL and DAC optimisation through DSP. These are explained in 'Overview of Resolution Enhancement'–page 49.

The de-jittering element is of great importance to some CD players, and of enormous significance to any LaserDisc player as they tend to have relatively high-jitter output. If you want to use a LaserDisc player for serious CD listening, then the de-jittering in 518 is absolutely necessary.

The DSP DAC optimisation uses the techniques described in Appendix 4. One function the 518 provides is matching the wordlength of the source to the capability of the DAC, so for example, it can match LaserDisc or CD (both 16 bits) to an 18 or 20 bit DAC.

Normally in this mode, the 518 is not used as a volume control. Optimum performance for a disc will come, either from using unity-gain (i.e. 0dB gain) or possibly a few dB boost to optimise the disc.

Meridian DSP speaker improvement

The Meridian DSP loudspeakers, provide the most advanced performance and highest-resolution sound available today. The DSP speakers only accept a digital input and in order to use analogue sources a Meridian 562 or 562V is often added. The 562 provides input handling for up to seven analogue signals using its in-built 16 bit delta-sigma analogue-to-digital converter (ADC).

3Setup details: set 518 to Type 1. Adjust Out to match DAC.

518 User Guide

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Contents 1992, 1993 Contents Appendix 4 -Resolution Enhancement Simple rules for usingAppendix 2 Hints on Mastering Designed & manufactured in the UK by Sales and service in the UKSales and service in the USA AcknowledgementsAbout the 500 Series IntroductionAbout this manual Conventions used in this manualUnpacking Installing yourGeneral precautions ConnectionsPlanning setup Whats inside a 518?Overview as Preamp Type What about analogue sources? What else do I need to know?CD or LaserDisc playback improvement Overview as Resolution Enhancement Processor TypeMeridian DSP speaker improvement Meridian Surround improvement Overview as Mastering Processor Type Overview as Multimedia Processor TypeCustomising features ∙ Normal ∙ Standby ∙ Type ∙ ConfigBasic operation Switching onStarting off with StandbySelecting a source Adjusting the volumeOperating 518 as a Control Unit Type OutShape a DitherFlat Shape BDisplay Advanced operation using the Remote Control Muting the sound Operating 518 as Resolution Enhancer TypeVolume control Menu KeysOperation summary With the Remote ControlMemory Config control settings Restoring default settingsConfig an overview Customising 518, an overviewConfig sources and inputs How to customiseCustomising, general procedure How to change to Type or ConfigMaking changes to an existing setup Customising using TypeHow to change back to Normal Setting Type ControllerConfig Customising using ConfigHow to use Config Selecting TypesSetting the product address for Selecting the controller modeSetting the system address for Setting the Standby mode forSetting the Volume mode for Setting the Blank display option forSetting the Emphasis option for Setting the Volume displayChoosing source logos Setting up sourcesVol. dB Choosing the Comms type for a source product Changing the input for a sourceChoosing the address of a source product Digital input connections ConnectionsDigital audio connections Digital output connectionTo connect to other Meridian 500 Series equipment Connecting to Meridian Digital speakersCommunications connections ConPart Mastering ProcessorMeridian 500 Comms warning DescriptionAs a Mastering or Multimedia Processor Type D1 +2Emph +2 ShpB +2Making Recordings Transfer to editor Transfer to the final carrierNoise shaper characteristics Shaper Advantage 44.1kHz 48kHz Normal Pre-emphasisDigital Audio and Quantisation Operating BackgroundTransparency in digital systems DitherDynamic Range Noise Shaping with ditherPre and De-emphasis No change in sample size Simple rules for usingStep-down in sample word size Step up in dynamic rangeSpecification Additional technical informationHelp Cleaning Maintenance & ServicePart Appendix 1 Noise Shapes NoiseAbove noise spectrum for Shape B at 44.1kHz 0Hz 5kHz 10kHz 15kHz 20kHz Appendix 2 Hints on Mastering with noise-shaping Vulnerability of the signalAudible results of digital errors and editing Requirements for D/A conversionAppendix 2 Hints on Mastering Handset Functions Appendix 3 RS232GoTo Functions Appendix 4 -Resolution Enhancement Jitter and de-jitteringDynamic-range FrequencyDynamic-range optimisation with Gain Dynamic-range optimisation with Pre-emphasisShowing CD pre- and de-emphasis curves Dynamic-range optimisation with Noise-shaped Dither DAC enhancement by using high-frequency dither DAC or channel enhancement by word-length matchingContents IndexIndex User Guide User Guide