6
•
The headphones can be plugged into the
PHONES
connector. Adjust the audio level
with the
VOLUME
control beside the connector.
•
The two position Process/Bypass switch selects the state of the filter stages. To have
the PicoDAC process (filter) the input signal flip the switch to
PRO
(Process). To have
the PicoDAC bypass the two filter stages flip the switch to
BYP
(Bypass).
•
The red
Power
LED indicates that the PicoDAC is operating.
Now refer to the Figure 1 illustration of the rear panel for the remaining controls.
•
The
INPUT
RCA jack is the PicoDAC’s input. This line level input allows the audio
source to be input into the PicoDAC for filtering. If the PicoDAC is not powered, the
INPUT
signal is automatically routed to the
OUTPUT
jack.
•
The
OUTPUT
RCA jack is the PicoDAC’s filtered output. This line level signal can be
connected to a copying tape recorder or loud speaker amplifier, if desired. If the
PicoDAC is not powered, the
INPUT
signal is automatically routed to the
OUTPUT
jack.
•
The
POWER
connector mates to a 2.5 mm barrel plug. To power the unit connect the
barrel plug of the AC to 12 VDC power adapter supplied with the unit to the
POWER
connector. The wiring guide for the plug is silk-screened on the rear panel. The
PicoDAC is activated with the
ON/OFF
switch. If no connection is made to the
POWER
connector the PicoDAC is powered from two internal 9 V alkaline batteries. NOTE:
The AC power adapter does not charge the internal batteries.
•
The
RESET
switch is used to restart the adaptive filters by pushing and releasing it.
This function is particularly useful if the filter “crashed” and produces only noise in its
output (a rare event when using the standard filters supplied with the PicoDAC).
Another example of when to press the
RESET
switch is when the audio scene changes
suddenly, requiring a new filter solution; this may occur when processing tape recorded
conversations that occurred at different locations. The
RESET
switch does not clear
the filter type and size settings nor affect the use of the
FILTER
selector switch, but it
instead clears the filter coefficients; its effect is comparable to turning the power off and
then back on.
•
The thumb screws are used to remove the PicoDAC top panel to access the batteries
(refer to Section 4.1 Battery Replacement for more information).
2.2 Typical Setups and Operating Instructions
Voice enhancement scenarios can take many forms. A basic enhancement setup is
shown in Figure 2. For the basic enhancement setup, connect the original source audio to
the
INPUT
connector on the rear panel of the PicoDAC. Notice in this example, a tape
player is used as the original source. However, the signal could come from many different
