Sine Oscillator; Recording The Oscillator; Rec Mute (Recording Silence); Dither - Tascam DA-78HR Owner's Manual

7 - Advanced operations
2 Press the
SUB MENU
shows ( RLS —release) and then changes
to the current value for that setting.
3 Use the
and keys to change the value
between the ( FAST
and ( MEDIUM ) settings.

7.9 Sine oscillator

The DA-78HR incorporates a digital oscillator for
lineup and signal tracing purposes. This oscillator is
a sine-wave oscillator at either the standard tuning
frequency of 440 Hz or a tape line-up signal at
1 kHz.
The oscillator signal level is at the nominal signal
level (but note that since the oscillator is a constant
sine wave, it cannot truly be compared with "real-
world" transient signals).
To operate the oscillator:
1 Press the
SHIFT key so that the
is flashing, and press the
display shows
AUDIO2--).
(
2 Press the
SUB MENU
OSC xxx
shows (
with the current setting).
3 Use the
and keys to switch the oscillator
between the different settings (
( 440 ), and (
When the oscillator is turned on, it overrides
all other track inputs.
The oscillator setting is not backed up with the other
settings.
NOTE
When using the oscillator, you should turn down the
monitor levels in the control room and studio to avoid
damage to your ears (and the speakers).

7.9.1 Recording the oscillator

As mentioned above, the oscillator overrides all other
track inputs, regardless of whether digital or analog
input has been selected.
Recording the oscillator test tone is therefore similar
to any other recording operation.
43
TASCAM DA-78HR
key until the display
), ( SLOW )
SHIFT indicator
MENU key until the
key until the display
, for oscillator,
OFF
( ),
1k ).

7.10REC MUTE (recording silence)

There may be times when you wish to prevent any
signal from reaching an armed track (in other words,
when you record, you are recording silence onto the
track.
1 Press the
SHIFT
key so that the
is flashing, and then press the
the display shows
2 Press the
SUB MENU
briefly shows
then changes to show the current setting (the
default is all off).
3 Change the settings using the
4 To set record muting for individual tracks, use
the track REC FUNCTION
tion keys, and change the settings individually
for each track using the
The display will show the track number and
the current mute setting (e.g.
1 OFF
).
5 When no track is selected using the
FUNCTION
keys, the display reverts to
ALL
( ), as it does if all tracks are the same
value.
SHIFT
If the
ON
keys are used, each meter shows the
record mute status of the correspond-
ingly-numbered track, as shown here
(only one segment lights to show the
mute status).
Press SHIFT
FUNCTION
4.1.1, "Peak meters") to toggle this
OFF
meter mode off and on. The default at
power-on is for this mode to be on.
Pressing the and keys together makes the
default setting.

7.11Dither

Dither is the technique of adding a known noise to
low-level signals, especially when converting from a
high number of bits (for instance 24 or 20 input bits,
as in the case of the DA-78HR) to a lower number
SHIFT
indicator
MENU
key until
( AUDIO1-- ).
key until the display
REC MUTE
( ) and
and keys.
keys as track selec-
and keys.
( TR
REC
REC FUNCTION
and
and one of the REC
keys (as described in