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Using 518 for Mastering and Multimedia 32
518 User Guide
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 3250kHz 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:
1. Press , to decrease the gain.
D1
+2
32


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