Related Manuals for Digital Audio Corporation MicroDAC IV
Summary of Contents for Digital Audio Corporation MicroDAC IV
- Page 1 MicroDAC IV PORTABLE PROGRAMMABLE DIGITAL FILTER USER’S MANUAL DIGITAL AUDIO CORPORATION A DRI COMPANY...
- Page 3 User’s Manual October 27, 1999 Document Number 990395 DIGITAL AUDIO CORPORATION A DRI Company 5121 Holly Ridge Drive Raleigh, NC 27612 Phone: 919 782 6767 Fax: 919 782 6766 sales@digitalaudiocompany.com www.digitalaudiocompany.com Copyright © 1999 by Digital Audio Corporation. All rights reserved.
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Page 5: Table Of Contents
2.2 Fast Start ......................13 3.0 STANDARD FILTER CONFIGURATIONS ..............15 3.1 Selecting the Correct Filter Mode................15 3.2 Hints For Effectively Using The MicroDAC IV’s Filtering Capabilities ....15 3.3 Factory Preset Filter Descriptions ...............16 3.4 Programmable Filter Descriptions ...............20 5.0 CALIBRATION AND SERVICE................23 6.0 MICRODAC IV SPECIFICATIONS ................25... - Page 7 Figure 3: 1CH MODE Block Diagram ................13 Figure 4: 2CH MODE Block Diagram ................13 Figure 5: 1CH ST MODE Block Diagram...............19 Table 1: MicroDAC IV Input Connections ..............13 Table 2: 1CH MODE First Stage Factory Presets ............16 Table 3: 1CH MODE Second Stage Factory Presets ............17 Table 4: 2CH MODE First Stage Factory Presets ............18...
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Page 9: Overview
1.0 OVERVIEW 1.1 Introduction The MicroDAC IV is a portable, programmable digital filter targeted for applications requiring unattended filter deployment. A replacement for the venerable MicroDAC III, this powerful signal processor is fully self-contained and features: Easy setup and operation... -
Page 10: Minimum Hardware Requirements
2.0 Minimum Requirements Hardware NOTE: Computer is required only for programming the MicroDAC IV; it is not required for stand- alone operation. 100 MHz CPU (Pentium or equivalent) Windows95/98/NT operating system 8 Megabytes of RAM At least 4 Megabytes spare hard disk space... -
Page 11: Operation
2.0 OPERATION MicroDAC IV promotes ease-of-use by reducing the number of buttons and switches the user needs to learn. All of the settings that required adjusting internal DIP switches in the previous version can now be accomplished using a computer. - Page 12 The MODE rotary switch selects the desired filter by rotating the knob to the desired filter. The MicroDAC IV will automatically reset and load the filter whenever the MODE setting is changed. Notice that one of the filter settings is labeled BYPASS; this setting simply routes the input signal to the output without any processing.
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Page 13: Fast Start
1. Connect the audio source(s) to the LEFT (PRI) and RIGHT (REF) ANALOG INPUT RCA jacks on the MicroDAC IV rear panel as shown in Table 1. Although this table assumes a live microphone preamp connected to the input of the MicroDAC IV, the signal could come from many types of sources such as a cassette or micro-cassette recorder, DAT recorder, videocassette recorder, telephone tap, or radio receiver. - Page 14 green. If these LEDs flash in the red color region, then the knob has been turned too far; reduce the corresponding INPUT LEVEL knob setting. Now adjust the PHONES knob to a comfortable listening level. NOTE: If the 2CH Adaptive filter is used, it is recommended that the RIGHT (REF) input be set to a slightly higher level than the LEFT (PRI) input to ensure maximum cancellation.
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Page 15: Standard Filter Configurations
MicroDAC IV’s filtering capabilities. Third, if the filtered output of the MicroDAC IV is to be recorded, make sure that the recording machine’s heads are clean and that the mechanism is properly lubricated and in good working... -
Page 16: Factory Preset Filter Descriptions
Finally, always use good quality, fresh tapes for all recordings, and if possible, monitor the recording as it is being made. 3.3 Factory Preset Filter Descriptions 1CH MODE: Figure 3: 1CH MODE Block Diagram Notice that in 1CH MODE, only the LEFT (PRI) input gets processed. This signal is first fed through the Limiter, which helps prevent the signal from distorting on overload. -
Page 17: Figure 4: 2Ch Mode Block Diagram
Table 3: 1CH MODE Second Stage Factory Presets Parameter Preset Value Filter Size 512 taps Prediction Span Delay 2 samples Adapt Rate Adapt Mode Auto Output Residue Algorithm Crash Detect Enabled Next, the signal is 200Hz Highpass filtered, to remove any low frequency noises that may remain after processing, and 3200Hz Lowpass filtered to remove high frequency hiss. -
Page 18: Table 4: 2Ch Mode First Stage Factory Presets
from a concealed microphone that has interfering radio/TV audio. The RIGHT (REF) input is the noise reference, usually the audio output from a second radio/TV tuned to the same channel. The signals are first fed through the stereo Limiter, which helps prevent the signals from distorting on overload. -
Page 19: Figure 5: 1Ch St Mode Block Diagram
1CH ST MODE: Figure 5: 1CH ST MODE Block Diagram Notice that in 1CH ST MODE, both the LEFT (PRI) and RIGHT (REF) inputs get fed into the processor. These are usually the stereo output signals from either a stereo microphone preamplifier or a stereo body wire receiver. -
Page 20: Programmable Filter Descriptions
Filter modes A-D are factory preset as large, single 2CH Adaptive filters. Their settings are listed in Tables 7-10. Please refer to the MicroDAC IV Portable Programmable Digital Filter Configuration Software User’s Manual for complete details on programming filter modes A-D. -
Page 21: Table 9: Programmable Mode C Factory Presets
Table 9: Programmable MODE C Factory Presets Parameter Preset Value Limiter Enabled Filter Size 3600 taps Delay Channel Input (Primary) Delay 100 samples Adapt Rate Adapt Mode Auto Output Residue Algorithm Reference Compensation Enabled Crash Detect Enabled 200 Hz Highpass Filter Enabled Lowpass Filter 3200 Hz Cutoff... -
Page 23: Calibration And Service
The MicroDAC IV is designed to make calibration unnecessary. However, future firmware upgrades will enhance the present capabilities of the MicroDAC IV. The firmware upgrades will be carried out over an RS-232 link in a similar way to the filter download, using special Windows software to be made available by DAC. -
Page 25: Microdac Iv Specifications
6.0 MICRODAC IV SPECIFICATIONS 6.1 Analog Line Inputs ·-29dBm to +14dBm, panel adjustable, Z = 11k ·Rear panel RCA connectors Line Outputs ·+5dBm, Z = 50 ohms ·Rear panel RCA connectors ·S/PDIF Digital Output (44.1kHz) Phones ·Suitable for stereo headset Output ·...
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