Meridian America Meridian 518 Description, As a Mastering or Multimedia Processor Type, D1 +2

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Using 518 for Mastering and Multimedia

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Description

The Meridian 518 Digital Audio Processor is a general-purpose digital- domain DSP engine that operates on or between consumer or professional interfaces at sampling frequencies between 32–50kHz and with up to 24 bit input and output.

The supplied user programmes are intended for use in recording, editing, mastering and replay situations.

The primary functions of 518 permit the correct signal processing when moving between carriers or channels of different word size. Options are also offered – in the form of noise-shaping, gain control and precision pre and de-emphasis – to maximise the subjective dynamic range of the final carrier or channel. Typical applications would be to use 518 at all stages, i.e. between an A/D converter and a recorder; then between the recorder and any editor; and finally between the editor and the final carrier.

518 has been extensively beta-tested, there are many highly-regarded commercially-available CDs that have used its processes.

518 as a Mastering or Multimedia Processor (Type 2)

This section covers unusual features of 518 operation when used in mastering or Multimedia processor mode (Type 2). Please refer to the normal operating instructions on page 15 for more details.

Meridian 500 Comms warning

We strongly recommend that you do not connect anything to the Comms sockets in Type 2. The behaviour of the 518 may be unpredictable.

If you want to use 518 as a Mastering or Multimedia Processor along with other Meridian equipment, we suggest you start from Type 1 and build the appropriate functionality in Config.

Emphasis Light

There is an Emph light on the front panel which indicates when the channel status suggests that the incoming audio is pre-emphasised. It is not affected by the user's settings on the 518 itself. Obviously in this circumstance, it is not advisable to pre-emphasise again using 518! Routinely 518 prevents you from making this mistake, however, against the possibility that the incoming channel-status may be wrong, you can over-ride this protection, see *Emph on page 26.

Selecting a source

1.press Source until the input you require is indicated

2.release Source

Gain control

Gain control is provided in one decibel steps from +12 dB down to -99 dB.

1. Press ▲

The gain will increase in 1dB increments, and the display will show the gain in dBs, something like:

D1 +2

1. Press ▼, to decrease the gain.

518 User Guide

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Contents 1992, 1993 Contents Appendix 2 Hints on Mastering Simple rules for usingAppendix 4 -Resolution Enhancement Sales and service in the UK Sales and service in the USADesigned & manufactured in the UK by AcknowledgementsIntroduction About this manualAbout the 500 Series Conventions used in this manualInstalling your General precautionsUnpacking ConnectionsPlanning setup Whats inside a 518?Overview as Preamp Type What about analogue sources? What else do I need to know?Meridian DSP speaker improvement Overview as Resolution Enhancement Processor TypeCD or LaserDisc playback improvement Meridian Surround improvement Overview as Mastering Processor Type Overview as Multimedia Processor TypeCustomising features ∙ Normal ∙ Standby ∙ Type ∙ ConfigSwitching on Starting off withBasic operation StandbyAdjusting the volume Operating 518 as a Control Unit TypeSelecting a source OutDither FlatShape a Shape BDisplay Advanced operation using the Remote Control Operating 518 as Resolution Enhancer Type Volume controlMuting the sound Menu KeysMemory With the Remote ControlOperation summary Restoring default settings Config an overviewConfig control settings Customising 518, an overviewHow to customise Customising, general procedureConfig sources and inputs How to change to Type or ConfigCustomising using Type How to change back to NormalMaking changes to an existing setup Setting Type ControllerCustomising using Config How to use ConfigConfig Selecting TypesSelecting the controller mode Setting the system address forSetting the product address for Setting the Standby mode forSetting the Blank display option for Setting the Emphasis option forSetting the Volume mode for Setting the Volume displayVol. dB Setting up sourcesChoosing source logos Choosing the address of a source product Changing the input for a sourceChoosing the Comms type for a source product Connections Digital audio connectionsDigital input connections Digital output connectionConnecting to Meridian Digital speakers Communications connectionsTo connect to other Meridian 500 Series equipment ConPart Mastering ProcessorDescription As a Mastering or Multimedia Processor TypeMeridian 500 Comms warning D1 +2Emph +2 ShpB +2Making Recordings Transfer to editor Transfer to the final carrierNoise shaper characteristics Shaper Advantage 44.1kHz 48kHz Normal Pre-emphasisOperating Background Transparency in digital systemsDigital Audio and Quantisation DitherPre and De-emphasis Noise Shaping with ditherDynamic Range Simple rules for using Step-down in sample word sizeNo change in sample 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 Vulnerability of the signal Audible results of digital errors and editingAppendix 2 Hints on Mastering with noise-shaping Requirements for D/A conversionAppendix 2 Hints on Mastering GoTo Functions Appendix 3 RS232Handset 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
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