Related Manuals for Digital Audio Corporation PikoDAC PDAC256
Summary of Contents for Digital Audio Corporation PikoDAC PDAC256
- Page 1 PicoDAC PORTABLE AUTOMATIC VOICE FILTER Model PDAC256 USER’S MANUAL IGITAL UDIO ORPORATION A DRI COMPANY “Technology to Make Listening Easier”...
- Page 3 PicoDAC PORTABLE AUTOMATIC VOICE FILTER User’s Manual March 4, 2004 Document Number 960812 IGITAL UDIO ORPORATION 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.
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Page 5: Table Of Contents
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 ................ - Page 6 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...............
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Page 7: Overview
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 •... -
Page 9: Operation
2.0 OPERATION The PicoDAC is easy to setup and operate. The following section discusses the connections and controls for the unit. Following that, the remaining sections describe typical setups and how to select the best filter. 2.1 Controls and Connectors Figure 1: PicoDAC Refer to Figure 1 for an illustration of the front panel controls. -
Page 10: Typical Setups And Operating Instructions
• 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). -
Page 11: Figure 2. Basic Enhancement Setup
types of sources such as a live microphone, cassette or micro-cassette recorder, DAT recorder, video cassette recorder, telephone, radio receiver or body transmitter. Connect a pair of stereo headphones to the front panel PHONES connector and a tape recorder to the rear panel OUTPUT connector to record the enhanced output. -
Page 13: Standard Filter Configurations
3.0 STANDARD FILTER CONFIGURATIONS 3.1 Preprogrammed Filter Setups The filters in the standard PicoDAC are optimized for noise cancellation to increase voice intelligibility. Simple noises are generally greatly attenuated. However, more complex noises such as those from bars or automobiles can only be modestly attenuated. The table below shows the characteristics of the filter selected by the front panel FILTER selector switch. -
Page 14: Hints For Using The Picodac Adaptive Filter
3.2 Hints For Using The PicoDAC Adaptive Filter: • First, it is vital that the source material is prepared as carefully as possible. No amount of filtering will enable the operator to hear a voice that is not there. For example, if the source audio is from a tape recorder and the microphone is beside a loud air conditioner and the target voices are 40 feet away, it is doubtful any recoverable voice was recorded on the tape. -
Page 15: Table 3: Filter Size And Noise Types
Filter Noise Type Examples Size Small Simple Background music, tones (2, 6) Noises Medium Normal Background music, tones, room (0, 3, 7) Setting reverberations. May provide superior quality. Large Complex Raspy hum or buzz (1, 4, 5, 8, 9) Noises Table 3: Filter Size and Noise Types... -
Page 17: Calibration And Service
4.0 CALIBRATION AND SERVICE The PicoDAC is designed to make periodic calibration unnecessary. However, the two internal 9V batteries will periodically need changing. If for any reason the top cover is removed, the internal DIP switch settings must not be altered. (All switch positions must be set to OFF.) If service is needed, please contact Digital Audio Company for assistance. -
Page 18: Figure 4: Picodac Rear Panel Removal
2. Remove the rear panel and bezel Figure 4: PicoDAC Rear Panel Removal 3. While holding the base of the unit, gently pull the black top cover toward the rear of the unit. Figure 5: PicoDAC Top Cover Removal... -
Page 19: Figure 6: Picodac Battery Removal
4. To remove the batteries push firmly on the back (the end opposite the terminals) of each battery in the direction of the terminals while prying upward. The battery should snap out of it’s clips back end first. Figure 6: PicoDAC Battery Removal To insert the new batteries simply reverse the previous action. -
Page 21: Picodac Specifications
5.0 PICODAC SPECIFICATIONS 5.1 Analog Line Input ·0.25 to 5.0 Vrms, panel adjustable, Z = 50 kΩ ·Rear panel phono connector = 100 Ω Line Output ·1 V ·Rear panel phono connector Phones ·Suitable for stereo headset Output · ·Front panel volume control and 3.5 mm stereo phones jack Analog ·16-bit sigma-delta A/D and D/A Conversion...
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