628
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The digital voice processor shall be capable of microphone signal amplification, simultaneous de-
essing, downward expansion or gating, variable-ratio compression and parametric equalization.
The processor shall operate on user-selectable sample rates of 32 kHz, 44.1 kHz or 48 kHz. The unit
shall allow the user to create, store in memory and recall 119 processing presets. The manufacturer
shall provide one bypass program and eight factory presets in read-only memory.
The unit shall have a low-noise, low-distortion microphone preamplifier with switchable (on/off)
phantom power. A 15 dB switchable pad shall be provided to attenuate high-output microphone
signals. A front panel switch shall be provided for switching between microphone and line level
(+4 dB, nominal) signals. When the line-level input is selected the microphone input circuit shall
be disconnected.
A digital de-esser function shall offer frequency-selective attenuation of up to 18 dB. The de-
esser shall be adjustable within the range of 800 Hz to 12 kHz. There shall be front panel frequency
and threshold controls as well as a bypass switch.
A digital downward expander/gate function will provide the user with a noise reduction function.
The expander shall have a variable threshold with a range from 0 dBFS to -60 dBFS. A front panel
ratio control shall be adjustable between a 1:1 to 10:1 range. An expander release time control shall
be adjustable between 250 milliseconds and 5.0 seconds. A front panel bypass switch shall
disengage the expander/gate function.
The digital compressor section shall have a user-adjustable ratio control operating through the
range of 1:1 to 15:1. A front panel threshold control shall have a range of 0 dBFS to -60 dBFS. The
compressor release time shall be adjustable in the range from 250 milliseconds to 5.0 seconds. A
front panel bypass switch shall disengage the compressor/limiter functions.
The cascaded, three-band, digital parametric equalizer shall offer overlapping bands of: 20 to 500
Hz, 160 to 6300 Hz and 680 to 20 kHz. A front panel switch shall toggle control and adjustment
between low, midrange and high equalizer functions. The equalizer section shall include a bypass
switch.
The analog outputs shall be selectable between line level (+4 dB nominal) and microphone level
(-40 dB nominal) by internal jumpers. The analog output shall be provided on two male XLR
connectors and two tip-ring 1/4 inch jacks.
The digital output shall accommodate both AES/EBU and S/P DIF formats. The AES/EBU output
connector shall be a male XLR connector. The S/P DIF output connector shall be an RCA female
jack. Output format selection shall be made with a rear panel push button switch.
MIDI control shall be provided through rear panel MINI input and MIDI output connectors. A
MIDI channel select switch shall provide operation on MIDI channels 1 through 16. A MIDI
program dump push-button switch shall transfer all programs from one digital voice processor to
another. An optional MIDI remote program selector shall provide access to programs 1 through 11
plus a bypass program (0). The voice processor shall supply power for the remote program
selector.
The digital voice processor shall operate by means of an internal power supply connected to 117
VAC, 50/60 Hz or 230 VAC, 50 Hz power.
The unit shall be the Symetrix, Incorporated, model 628 Digital Voice Processor.
Architect's and Engineering Specifications Chapter 9
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