The
DSP7000
Family Operating Manual
Page 30
The DSP7000 Family Operating Manual
Manual Release 1.1
2000 Eventide Inc.
DIGITAL SETUP
Digital Setup Overview
Before we look at the DSP7000’s digital setup in detail, let’s take in the “big picture.”
All of the DSP7000’s analog to digital conversion and digital to analog conversion is 24 bit.
The DSP7000 sports two digital inputs and two digital outputs. Unlike the analog inputs and outputs, the
digital inputs and outputs must be received or sent in pairs (because a single cable carries two channels). The
digital input can come from either the S/P DIF or the AES/EBU jack, but not both. Digital output is seen
at both the S/P DIF and AES/EBU outputs, but the format at both jacks is either “consumer” or “pro,”
but not both.
The DSP7000 assumes that signals at the digital inputs are 24 bit. No harm occurs if the input is in fact less
than 24 bit; subsequent processing will fill the lower bits.
The
system sampling rate
is derived from either an internal clock or an external clock. The internal clock rates
supplied by the DSP7000 include 44.1kHz, 48kHz, 88.2kHz, 96kHz, and the rate of an optional user-
supplied crystal (
note that 32kHz and 44.059kHz are not supplied
). The external clock is taken from the selected digital
inputs and can range from ~30kHz to ~50kHz and from ~54kHz to ~99kHz. The digital outputs are at the
system sampling rate
, and all analog to digital and digital to analog conversion is done at the
system sampling rate
.
S/P DIF & AES/EBU
The digital inputs are received at either the AES/EBU input jack
or the S/P DIF input jack. To select between the two, use the
DIG IN
parameter on the
audio
menu page in the
SETUP
area.
For the time being, ignore the other parameters on this menu page.
The digital outputs are seen at
both
the AES/EBU output jack
and the S/P DIF output jack. However, the signal at both jacks
can only be one
format
: “consumer” (S/P DIF) or “pro”
(AES/EBU). To select between the two formats, use the
DIG
OUT
parameter on the
audio
menu page in the
SETUP
area. Put
another way, you can connect a cable to the AES/EBU jack, set
DIG OUT
to
S/P DIF
, and still get signal.
However, that signal will be in “consumer” format.
Note: The digital inputs need not be assigned to the same
protocol as the digital outputs, as is shown to the right. In other
words, the digital inputs can be received at the AES/EBU input
jack and sent to the digital outputs in “consumer” (S/P DIF)
format. Or
vice versa
.
Sampling Rates
The DSP7000 can operate over a range of sampling rates from
32kHz to 100kHz. Because the higher sampling rates demand
more of the signal processing resources, some large presets will
not operate at the higher rates. To allow for this, the DSP7000
