Recording; Analog Recording Setup - Akai DR4vr Operator's Manual

Recording 23
4 Recording
In this chapter,
we
explain
how
to record using
the
DR4vr. You
can use
up
to
250
virtual tracks
to
assign to
Channels 1-4 for recording. This
virtual track capability
allows you
to use the
same
channel again, while leaving the existing data as
is.
(See "Virtual
Tracks" on page
27.)
Your
DR4vr
should
already
have an
optional
hard
disk installed, so
you have everything you
need.
However,
the
hard
disk
must be formatted before
use.
See
"Formatting
New
Disks" on
page
74.
Analog
Recording Setup
To
record via the analog
inputs,
you must
select
the analog
inputs,
then
set the
sampling
frequency.
Sampling Frequency
It is
important
that
you
set
the samp»ling frequency before
recording.
If
it is
changed
after
some
material has been recorded,
that
material will
playback
at
the
wrong
pitch.
The DR4vr
can
record
at
any one
of the
three
common
digital
audio sampling
frequencies:
32 kHz,
44.
1
kHz, and 48 kHz.
The
deciding factors
in
your choice
of
sampling frequency
are:
application, required audio bandwidth, and
available hard disk space.
Some
information about
sampling frequency,
applications,
and
audio
bandwidth
are provided below.
See
also
"Hard
Disk
Size"
on page
70.
If
you
intend
to
backup
to
DAT,
refer to
your DAT's
operating
manual
to see
which sampling
frequencies
it
can
record
at
via
its
digital inputs.
48 kHz
This frequency
is
supported by most
professiortal digital
audio equipment and
provides
an
audio
bandwidth
of about 22 kHz.
Consumer
type
DAT
and
DCC
recorders
typically
record
at
this
frequency
when
their
analog
inputs are used.
Use
this
frequency
if
you want
the highest
audio bandwidth. Although, bear
in
mind
that
an expensive sampling frequency conversion
will
be
required before your
material
can be
transferred to
CD.
44.
T
kHz
This frequency
is
supported
by most
professional
digital
audio
equipment and
provides an
audio bandwidth of about 20 kHz. Prerecorded CDs,
DCC
tapes,
and
MDs
use
this
frequency.
Professional recording studios
that utilize digital
equipment
typically
use
it.
If
your
DR4vr
material
is
destined for
distribution
on
CD,
then
it's
best to
use
this
frequency.
32 kHz
This frequency
is
widely used
for digital broadcast applications
where
a 15
kHz
audio
bandwidth, about
that
of
FM
radio,
is
deemed
acceptable.
It
is
also
used
for
some
DSB
(Digital
Satellite Broadcasting)
applications.
It
offers the
lowest audio
bandwidth,
but the
maximum
recording
time.
It
maybe
useful for projects
where
recording time takes
precedence over audio
bandwidth.
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