Operation, cont’d
MVX Plus 128 VGA Matrix Switchers • Operation
3-34
PRELIMINAR
Y
Reading the displayed volume
N
This section is a detailed look at reading the output volume display on the
switcher’s front panel. If you do not need to read the exact value of the volume
setting, skip this section.
There are 65 steps of volume attenuation, with 1 dB per step (button push), except
for 0-to-1, which is 35 dB. At maximum attenuation, no input buttons are lit,
98 dB of attenuation is applied, and the audio output is effectively muted. At no
attenuation, all input buttons are lit and the output volume is equal to the input
signal plus any gain or attenuation that is applied to that specifi c input using the
input audio level adjustment. See
Viewing and adjusting the input audio level
, earlier
in this chapter See the table on the next page to read the volume display for each
display scheme.
The input buttons blink or light sequentially to indicate the approximate volume
of the selected output. Volume is defi ned as a percentage of the input audio signal
that is applied to the output. From 0% of volume, the fi rst Esc (
>
) button push
applies 5.5% of the input audio signal. From 5.5% on, each Esc (
>
) push applies
1.5% more of the input audio signal to the output:
•
Push Esc (
>
) button —
5.5% + 1.5% = 7% volume. The Input 1 button
continues blinking slowly.
•
Push Esc (
>
) button twice —
7% + 1.5% + 1.5% = 10% volume. The Input 1
button begins to blink quickly.
•
Push Esc (
>
) button nineteen times
— 10% + (19•1.5%) = 38.5% volume.
Indicated by the Input 1 through 4 buttons lit steadily.
When all input buttons are lit, the audio output is 100% of the audio input level.
Another way to view the volume level is to think in terms of the attenuation that
is applied to the output. Attenuation reduction is indicated by the lit or blinking
input buttons: when fewer input buttons are lit, attenuation is greater (and the
volume is quieter).
• At minimum volume, all input buttons are unlit or background illuminated
and 98 dB of attenuation is applied to the output. The audio output is
effectively muted.
• The
fi rst step of volume increase causes the Input 1 button to blink slowly.
Attenuation is reduced by 35 dB (63 dB of attenuation is applied to the
output). There is no change in the volume indication.
• The second step of volume increase reduces the attenuation by an additional
1 dB (62 dB of attenuation is applied to the output). The front panel display
is unchanged.
• Successive steps of volume increase cause consecutive input buttons to fi rst
blink slowly, then quickly, and then light steadily.
For example
: When lit steadily, the Input 3 button indicates 47 dB of
attenuation when compared to the Input 3 button blinking quickly (48 dB
to 50 dB of attenuation). The blinking Input 4 button (45 dB to 46 dB
of attenuation) is at least 2 dB less than the fast blinking Input 3 button
(48 dB – 46 dB) and at most 5 dB less (50 dB – 45 dB).
See the table on page 3-35 to read the volume display.
Содержание VGA MATRIX SWITCHERS MVX PLUS 128
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