Symetrix 628 Digital Voice Processor, Руководство пользователя

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628
1
Introduction Chapter 1
Development of the Symetrix 628 grew from requests
by users of our 528 and 528E Voice Processors.
Many were frustrated that their 528 required tweaks
of the processing parameters with each change in
vocalist or broadcaster. Otherwise, they were forced
to compromise their microphone processing by
adopting a “one size fits all” approach with a single
set of processing settings. Most users needed an
affordable, easy-to-use, voice processor which
allowed the creation and recall of a set of processing
parameters for individual users. We responded with
a digital version of the 528E - the Symetrix 628 Digital
Voice Processor.
Use your new 628 with any professional low-
impedance, balanced microphone. The 628 powers
balanced, phantom-powered microphones via an
integral phantom supply. The input circuit uses
matched resistors to attain a high common-mode
rejection ratio (CMMR), and multistage filters
prevent RFI problems. A front panel MIC/LINE
switch selects between the microphone input and
line input. The GAIN control adjusts both micro-
phone and line input signals.
The input stage feeds a 20 bit A/D converter, then a
24 bit Motorola digital signal processor takes over to
handle the signal dynamics. The 628’s De-Esser
compresses undesirable high-frequency sounds
above the user-selected threshold. The De-esser
attacks only excess sibilance sounds.
RATIO and RELEASE controls on the 628’s discrete
EXPANDER/GATE section offer infinitely more
adjustment range than the 528 or 528E. On the
analog units, the EXPANDER is limited to a single
THRESHOLD control in the COMPRESSOR stage.
The 628’s RATIO control varies function of the
stage between expansion and gating. The 628’s
RELEASE control selects the speed at which the
EXPANDER/GATE operates.
The 628’s COMPRESSOR stage offers improvement
over earlier models with the addition of a RELEASE
control. We retained the familiar THRESHOLD and
RATIO controls. Separate LED meters for both the
COMPRESSOR and EXPANDER/GATE stages
provide visual indication of the amount of process-
ing taking place in each section.
The 628 bundles all three parametric equalizers into a
single control area. A push button switch toggles
between LOW, MID and HIGH frequency sections.
The equalizer bands and controls remain the same as
on the 528E, except you now read FREQUENCY,
BANDWIDTH and CUT or BOOST on the numeric
display.
The OUTPUT LEVEL pot tweaks the output gain
and the LED headroom meter provides a visual
indication of the output level. The 628 steps through
its 128 presets with a twist of the PRESET NUMBER
control. Load the indicated preset by pushing the
LOAD button. You save changes to a preset by
pushing the SAVE button.
The 628 provides both analog and digital outputs.
The analog output can be at line level (+4 dBu) or
switched to microphone level (-40 dBu) via internal
jumpers. The digital output supports both AES/EBU
and S/P DIF formats at sample rates of 32 kHz, 44.1
kHz and 48 kHz.
Sounds easy doesn’t it? We don’t make you step
through multilayer menus. The 628 purposely looks
and feels like the 528E; we traded out the analog pots
for binary switches. When you need to make a
change just grab the right knob and give it a turn!
The 628’s front panel is very intuitive; you probably
feel that you don’t need to finish reading the manual.
Don’t cheat yourself, read the manual, learn the finer
points of operating the 628, and get the maximum
benefit from your new 628 Digital Voice Processor.
Call us with any questions or if you have something
tasty on the stove to share (we’ll eat anything but
anchovies).
Front panel
Rear panel
MASTER
HIGH MID LOW
PARAMETRIC EQ
SAVE LOAD
NUMBER
PRESET
HEADROOM (dB)
LEVEL
OUTPUT
(dB) (Oct)
CUT/BOOST
(kHz)
FREQUENCY BANDWIDTH
4 (680-20kHZ) (20-500Hz) (160-6300Hz) ACTIVE 20 28 24 12 16 8 CLIP
COMPRESSOR EXPANDER/GATE DE-ESSER
MIC
PRE-AMP
(Sec)
RELEASE
(dBFS)
THRESHOLD
(X:1)
RATIO RELEASE
(Sec)
RATIO
(X:1)
THRESHOLD
(dBFS) (kHz)
FREQUENCY
75
-15 PAD
NORM
15
GAIN
(dB)
628
DIGITAL VOICE
PROCESSOR
(dBFS)
THRESHOLD
-6
PHANTOM CLIP
-18
-12
-15 -9 ACTIVE -3 -12 -18 -15 -6 -9 -3 ACTIVE -9 -15 -18 -12 -3 -6 ACTIVE
LINE
+20 -12
POWER
PHANTOM
ON
OFF
MICROPHONE ANALOG LEFT LINE
RATE
SAMPLE
32kHz
44.1kHz
48kHz
SELECT
UNBALANCED
OUTPUT
S/P DIF ANALOG RIGHT
UNBALANCED
INPUT
SELECT
S/P DIF
AES/EBU
MIDI/RC-1 IN AES/EBU
MIDI
CHANNEL
MIDI
PROGRAM
1314
12
1
16
2
7 3
15
11
8
9
10
DUMP SELECT
628 DIGITAL VOICE
PROCESSOR
6 4
5
MIDI OUT/THRU
REMOTE CONTROL
MAXIMUM
15 WATTS
AC INPUT
RÉFÉREZ TOUTE RÉPARATION À UN TECHNICIEN QUALIFIÉ.
FABRIQUÉ AUX E.-U. PAR SYMETRIX INC., LYNNWOOD, WASHINGTON.
MANUFACTURED IN LYNNWOOD, WA, USA
DIGITAL OUTPUT