Plasma Display - MCi JH-500 Series Manual

PLASMA DISPLAY
An optional AUDIO METERING SYSTEM is available for use with
the JH-SOO Series Mixing Desk. The PLASMA DISPLAY uses a one-
hundred segment NEON GLOW TUBE to produce a lighted BAR GRAPH.
Cardinal scale markings on the Bar Graph are shown by brighter
bars produced by PROMs (Pr ogrammable Read Only Memor ies) in a dif-
ferent pattern for each mode of operation. Each Bar Graph is
scanned (refreshed) over 80 times per second for a highly read-
able, flicker-free display.
There are two PRIMARY modes of operation,
In addition, the "Accumulate" mode can be
the two Primary modes.
"VU" and "PEAK".
added to either Of
The VU mode shows the Audio Level on a Display which uses a
conventional VU (logarithmic) scale.
The PEAK mode displays the Peak Audio Voltage ratio as dB
units on a linear scale. Increments of 1/2 dB are shown on
a range from -46 dB to +6 dB.
The ACCUMULATE mode is displayed as an additional reading
which appears above the normal "Transient" Audio Display.
This mode provides a "MEMORY" for the HIGHEST AUDIO PEAK
which occurs on each channel during the time it is operating.
The ACCUMULATE reading is shown as a lower intensity graph
above the TRANSIENT AUDIO reading.
As soon as a new Audio Level occurs which is higher than the
one in memory, the circuit shifts to the new, higher reading.
The value of the scale units .is the same as the Primary mode
being used. (VU units when used with Vu mode, Voltage Ratio in dB
when used with PEAK mode).
Single channel ACCUMULATE readings may be cancelled and reset
by a button under each Display. A master circuit is provided
to cancel and reset all displays simultaneously.
Softly-glowing LUMINESCENT PANELS are a standard feature with
the Plasma Display. They are both beautiful and useful. In
addition to identifying the Display mode, they light up to
show the modes of operation being used in the Console. You
are reminded by a glowing panel:
That the inputs are coming from the LINE - or from TAPE.
That the CHANNEL OUTPUT BUSSES are being fed - or that
the MONITORS are activated .
That the VCAs are at maximum gain - or that a SOLO has
been activated.
That the DISPLAYS are switched to VU mode - or to PEAK
mode.