The
DSP7000
Family Operating Manual
Page 34
The DSP7000 Family Operating Manual
Manual Release 1.1
2000 Eventide Inc.
The status of the digital inputs (
dstatus
on the
audio
menu page in the
SETUP
area) will be:
slipping
signal is present, but very unstable. A digital input that is
slipping
will probably
suffer from clicks or distortion. Some slipping may be acceptable for monitoring or
other noncritical applications.
OK
signal is present and stable. Everything’s groovy.
If a signal’s sampling rate is not completely stable,
its status will read
OK
with brief interjections of
slipping
. This is normal and may well not produce measurable dis-
tortion.
unlocked
no signal is present, the signal’s sampling rate is very unstable, or something is dread-
fully wrong with the signal.
The sampling rate at the digital outputs will be the same as the sampling rate of the digital inputs (which is
the system sampling rate in
external
). A/D and D/A conversion will be done at the sampling rate of the digi-
tal inputs (which is the system sampling rate in
external
).
Understanding The “System Sampling Rate And External Sync Indicator” When Using The External Clock
The “System Sampling Rate and External Sync Indicator” is the box of five LEDs immediately to the left of
the display. The top four LEDs indicate the status of the system sampling rate:
•
Solidly lit
: When one of the top four LEDs is solidly lit, the system sampling rate is
exact (
+/- 0.05%
) (
the LED corresponding to the system sampling rate will illuminate
).
•
Blinking
: When one of the top four LEDs is blinking, the system sampling rate is
between one of the fixed rates (
the LED corresponding to the nearest sampling rate will blink
).
Use the “
(actual: xxxxx)
” field on the
audio
menu page in
the
SETUP
area to see the
actual
sampling rate.
The bottom LED,
EXT
, has three possible states:
•
Solidly lit
: When the bottom LED is solidly lit, digital inputs are locked and all is right with the world.
•
Blinking regularly
: When the bottom LED is blinking regularly, digital inputs are
not locked
. Because
digital inputs are not locked, the external clock is invalid. Because the external clock is invalid, the sys-
tem sampling rate will revert to the last valid
internal
clock rate.
•
Blinking irregularly
: When the bottom LED is blinking irregularly, the digital inputs are slipping, i.e.,
are very unstable.