--
I-
be
continuously adjusted
from
the displayed value
down
to
50%
of
that
value,
e.g.
128
msec
can
be
adjusted
down
to
64
msec.
A
maximum
sweep
range of
one
second
is
possible with optional
memory.
Uncalibrated delays
set
with
DELAY
ADJUST
are indicated with a bold
UNCAL
light
centrally
located in the
display
window.
With
DELAY
ADJUST
in the detented
11
(cal)
11
position,
M.93
locks into
an
accurate
crystal
time base
for
the actual indicated delay
time (the displayed value times the
multiplier).
2.3
MIXERS,
THE
IN'S
AND
OUT'S
The
INPUT
MIX
supplies the input signal to the
digital
delay processor.
It
consists
of
four functions with independently adjustable level controls
and
a
MASTER
control
which
determines the level
of
the
resultant
blend.
The
four
functions are
two
identical
but independent inputs,IN
and
AUX,
and
two
delay
taps,
A
and
B.
The
delay taps are
recirculated
from
the outputs through
variable
6 dB/octave
ROLLOFF
filters
which
adjust
the high
end
rolloff
frequency
from
15
kHz
to
800
Hz.
Monitoring the delay processor input, the
HEADROOM
indicator
displays
peak
signal
levels
on
a sequential array
of
five
LED's
indicating
from
40
dB
below
limit
to 0
dB
(limit).
When
the
20
dB
LED
just
comes
on, for example,
there
is
20
dB
of
dynamic
range
left
before
limit,
i.e.
20
dB
of
headroom.
Optimum
levels
can
be
achieved
by
proper adjustment
of
the
INPUT
MIX
MASTER
control
which
provides
up
to 6
dB
of
gain
and
up
to
25
dB
of
attenuation.
The
OUTPUT
MIX
supplies signal to the
MASTER
OUTPUT.
Like the
INPUT
MIX,
it
blends four functions
of
which
two
are the inputs,
IN
and
AUX,
and
two
are
the delay
taps,
A
and
B.
The
overall level
is
adjusted with the
MASTER
control
which
can
provide
from
zero to
infinite
attenuation.
When
in danger
of
overloading the output
stage,
the
OVERLOAD
indicator
will
light.
The
OVERLOAD
function indicates the
levels
of
the four mixer functions only
and
is
not
affected
by
the
MASTER
control.
For
additional
flexibility
IN,
A,
and
B functions
can
be
inverted with
their
respective
PHASE
INVERT
switches be-
fore the
OUTPUT
MIX.
The
PHASE
INVERT
switches also determine the phase of
the
recirculated
delays to the
INPUT
MIX.
2.4
vco
The
voltage
controlled
oscillator
(VCO)
provides continuously variable delay
5
11
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