Manual Meridian 518 (page 31 of 58) (English)

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Using 518 for Mastering and Multimedia 31

518 User Guide

Part 2

Mastering Processor

The Meridian 518 Digital Audio Processor has been designed to allow

the making of better recordings, and in particular to enable the

production of high-quality, enhanced-definition CDs.

The predominantly available channels for delivering high-quality sound

to consumers is stereo, linear-encoded 16 bit PCM. There is also no

realistic prospect of a widely-available improvement on this capability.

While CD is limited to 16 bits, we now have A/D converters, recorders

and editors operating with anywhere between 16 and 24 bit words.

The Meridian 518 provides the very best quality and combination of

signal-processing functions for use when preparing material for issue on

media like CD. In fact, using the unique signal processing in 518, CDs can

be produced with up to 19-bit subjective dynamic range.

The functions of 518 have been optimised for use in three stages of

the production process, namely:

• on location, processing the signal between the A/D converter and

recorder,

• during transfer of a recording to an editor,

• during transfer from editor to production master.

In each such step, the word-size can be different, and 518 can make

these processes optimal.

The signal-processing used is based on an extensive programme of

research, and is implemented in DSP with an internal precision of 72

bits to ensure exceptional transparency. For a very full technical

background, please see the papers referred to below: copies may be

obtained from Meridian.

518 also finds applications in professional or consumer replay

situations. Here the precision gain control and pre/de-emphasis

processing can replace the system preamp and enhance the dynamic

range of a D/A converter – see the earlier sections of this manual.

J.R. Stuart and R.J. Wilson, "A Search for Efficient Dither for DSP

Applications", 92nd AES Convention, Vienna 1991, Preprint #3334

J.R. Stuart, "Noise: Methods for estimating Detectability and Threshold", 94th

AES Convention, Berlin 1993, Preprint #3477

M.A. Gerzon, P.G. Craven, J.R. Stuart, R.J. Wilson, "Psychoacoustic Noise-

Shaped Improvements to CD and other Linear Digital Media", 94th AES

Convention, Berlin 1993, Preprint #3501

J.R. Stuart and R.J. Wilson, "Dynamic Range Enhancement Using Noise-

Shaped Dither Applied to Signals With and Without Pre-emphasis", In

preparation for AES Convention, Amsterdam 1994.

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Meridian 518 Manual

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