Digital Audio Corporation PikoDAC PDAC256, PicoDAC PDAC256 User Manual
PicoDAC
PORTABLE AUTOMATIC VOICE
FILTER
Model PDAC256
USER’S MANUAL
DIGITAL AUDIO CORPORATION
A DRI COMPANY
“Technology to Make Listening Easier”
PicoDAC
PORTABLE AUTOMATIC VOICE FILTER
User’s Manual
March 4, 2004
Document Number 960812
DIGITAL AUDIO CORPORATION
A DRI Company
4018 Patriot Drive
One Park Center, Suite 300
Durham, NC 27703
Phone: 877 5DACAUDIO
Fax: 877 5DACFAX
sales@dacaudio.com
www.dacaudio.com
Copyright © 2004 by Digital Recorders, Inc.
All rights reserved.
TABLE OF CONTENTS
1.0 OVERVIEW............................................................................................................... 3
1.1 Introduction ........................................................................................................... 3
1.2 Standard Filter Configurations .............................................................................. 3
1.3 Custom Filter Configurations................................................................................. 3
2.0 OPERATION ............................................................................................................. 5
2.1 Controls and Connectors ...................................................................................... 5
2.2 Typical Setups and Operating Instructions............................................................ 6
3.0 STANDARD FILTER CONFIGURATIONS................................................................ 9
3.1 Preprogrammed Filter Setups ............................................................................... 9
3.2 Hints For Using The PicoDAC Adaptive Filter:.................................................... 10
4.0 CALIBRATION AND SERVICE ............................................................................... 13
4.1 Battery Replacement .......................................................................................... 13
5.0 PICODAC SPECIFICATIONS ................................................................................. 17
5.1 Analog................................................................................................................. 17
5.2 Digital .................................................................................................................. 17
5.3 Construction........................................................................................................ 17
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LIST OF TABLES
Table 1: Standard Filter Configuration............................................................................. 9
Table 2: Filter Bandwidths............................................................................................. 10
Table 3: Filter Size and Noise Types............................................................................. 11
LIST OF FIGURES
Figure 1: PicoDAC........................................................................................................... 5
Figure 2. Basic Enhancement Setup............................................................................... 7
Figure 3: PicoDAC Rear Panel Thumb Screws............................................................. 13
Figure 4: PicoDAC Rear Panel Removal....................................................................... 14
Figure 5: PicoDAC Top Cover Removal........................................................................ 14
Figure 6: PicoDAC Battery Removal ............................................................................. 15
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1.0 OVERVIEW
1.1 Introduction
The PicoDAC digital filter is a compact, low-power digital filter intended for dedicated field
signal processing applications. This powerful signal processor is fully self-contained and
features:
• Easy set up and operation
• Operation with live voice signals, tape recorders (all types), video cassette
recorder, telephone, radio receiver, and body transmitter
• Low-power, 8-16 VDC operation, or internal 9V battery operation
• Compact enclosure (1.1" H x 2.8" W x 7.2" D)
• Bandwidths of 3.4, 5.0 and 7.5 kHz suitable for voice enhancement
• Ten selectable filters to cover most voice enhancement scenarios
• Two stages of 256th order, fixed and/or adaptive filters
1.2 Standard Filter Configurations
The ten standard filter configurations in the PicoDAC are optimized for noise removal and
clarification of live and recorded voice signals. The standard filter configurations consist of
combinations of three different adaptive filter sizes at three bandwidths followed by either
another short adaptive filter or a bandlimiting filter. The selected combinations of filter
bandwidths and sizes allow the operator to easily customize the PicoDAC to a wide range
of noise removal situations. Any of the ten filters can be rapidly selected with a front panel
FILTER switch as detailed in Section 3.0.
1.3 Custom Filter Configurations
Custom filter selections are also available for special applications. Please contact
Digital Audio Company for further information.
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