Digital Audio Corporation MicroDAC IV Uživatelský manuál

Multi-Channel Reference Canceller USER’S MANUAL Version 1.5

Page 4 2.2 Using Digital Input Audio for Reference Cancellation The S/PDIF and TOSLINK inputs always receive two channels of audio, LEFT channel and

Page 5 3 Standalone Controls Controls on the MicroDAC 5 unit are used to configure the audio I/O and also to provide a limited set of filter controls

Page 6 the VOLUME knob always controls only the headphone level; the rear-panel output level is not adjustable. 3.1.3 Input Level Controls The center

Page 7 MONO/STEREO Selection nCH Selection Description MONO 1CH Mono input, no references. MONO 2CH, Option A Mono primary, one reference on LREF.

Page 8 3.1.4.5 Clear Filters Use the CLEAR button to clear the solution of all adaptive filters. 3.1.5 Lock/Unlock Unit As marked on the front panel,

Page 9 4 Specifications 4.1 Power  9-18VDC input, 2A  2.1mm “barrel” connector, positive tip  Universal AC adaptor supplied 4.2 Analog Audio

Page 10  Audio Output (1): o TOSLINK optical interface, constant 24-bit data resolution and 44.1kHz sample rate  Control Interface (1): o USB 2.

Page 11 5 MicroDAC 5 Configuration Utility Overview 5.1 Introduction The MicroDAC 5 Configuration Utility allows for complete setup and intuitive, i

Page 12 5.3 Filters Four different filters are available to place into the signal chain. These are selectable on the right-hand side of the main scr

Page 13 5.5 Clearing and Freezing Filters The reference canceller and 1CH filters are adaptive filters. This means that their filter coefficients ar

Page 14 Figure 5-3: Mono sub-menu In mono mode, there are six options available, three of which are shown in the following figures:  1CH: This i

Page 15 Figure 5-4: Mono 2CH with Reference on LRef Input Figure 5-5: Mono 3CH with References on Right and LRef Inputs

Page 16 Figure 5-6: Mono 4CH 5.6.2 Stereo Configurations To configure the unit for a stereo signal, click the “Channels” menu and select the “Ster

Page 17 Figure 5-7: Stereo sub-menu In stereo mode, there are three options available, two of which are shown in the following figures:  1CH: Th

Page 18 Figure 5-8: Stereo 2CH Figure 5-9: Stereo 3CH

Page 19 5.6.3 Audio Line Out Configuration By default, the audio line outputs on the rear panel (labeled ANALOG OUTPUTS and DIGITAL OUTPUT) always co

Page 20 always load to an adapting state. (If you want to clear a filter and leave it cleared for a period of time, you can first freeze adaptation a

Page 21 are stored in nonvolatile memory on an unknown unit.) If “No” is selected, then the most recent software configuration will be “pushed” down

Page 22 5.10.1 Locked Standalone Behavior after PC Programming After PC programming, the unit will power up in the locked state. As long as the unit

Page 23 they are “out.” Taking one of these filters out and then putting it back in does not overwrite the programmed cutoff (for the HPF) or maximum

MicroDAC 5 Multi-Channel Reference Canceller USER’S MANUAL Version 1.5 July 20, 2007 Document Number 061103JW Phone: 919 572 6767 Fax: 9

Page 24  MONO/STEREO setting  BW setting  nCH setting  HPF in/out  AGC in/out  LOCK/UNLOCK state Other settings cannot be overwritten in

Page 25 6 Filters To configure a specific filter, click on that filter in the signal flow diagram on the main window. Doing so will open the configu

Page 26 Figure 6-1: nCH Filter Dialog Description of the controls pictured in Figure 6-1 follows: Filter Size Used to set the number of FIR filter

Page 27 samples and in milliseconds. Minimum Delay is 1 sample, but can be set to as high as 2250 samples depending on the channel configuration. Fil

Page 28 When the MicroDAC 5 is running standalone (not connected to the PC), the filter runs at whatever settings are stored in the nonvolatile memory

Page 29 Slower adapt rates take longer to reach a solution or to adapt to changing signal characteristics, but a slow rate is still quite effective fo

Page 30 changes suddenly, requiring a new filter solution; this may occur when the microphone is moved, or when processing tape recorded conversations

Page 31 Figure 6-4: Automatic Gain Control Dialog The only adjustable setting available for the Automatic Gain Control is the maximum possible gain

Page 32

Page 33 7 Installation To install the MicroDAC 5 software, insert the MicroDAC 5 Installation CD into your CD-ROM drive. If the installation softwar

Page 34 2. If .NET 2.0 is not already installed on your machine, it will be installed automatically. NOTE: The .NET 2.0 Framework is large and take

Page 35 3. After the .NET install completes, you will get a “Welcome” screen. If there is a MicroDAC 5 unit connected to your computer, make sure it

Page 36 5. When Setup has completed the installation, the “Finish” screen will be displayed. Click “Finish” to close the window. Figure 7-5: Fini

Page 37 7. Next, before running the MicroDAC 5 software, attach the MicroDAC 5 hardware to your computer via the included USB cable, and turn on the

Page 38 b. You will see a window asking if the software should be installed automatically. Select “Install the software automatically”, then click “N

Page 39 d. Once the driver has finished installing you will be presented with a window indicating completion of the Found New Hardware wizard. Click

Page 40 7.2 Windows Vista Installation Instructions 1. After inserting the installation disk, you may be presented with an AutoPlay window promptin

Page 41 3. You will be presented with a “Welcome” screen. If there is a MicroDAC 5 unit connected to your computer, make sure it is turned off. The

Page 42 5. Setup will then install the necessary MicroDAC 5 files and drivers. Figure 7-15: Installing files 6. When Setup as completed the in

Page 43 7. You may see another “unidentified program” warning window; again, choose “Allow”. Figure 7-17: Windows Vista "unidentified program

Table of Contents 1 Overview...1 1.1 Introdu

Page 44 9. Next, before running the MicroDAC 5 software, attach the MicroDAC 5 hardware to your computer via the included USB cable, and turn on the

6.3 Highpass Filter...30 6.4 Automatic Gain Control...

Page 1 1 Overview 1.1 Introduction MicroDAC 5 is the latest generation of DAC's most popular tactical digital adaptive filter. The MicroDAC 5

Page 2 stability, and automatic crash detection is enabled to allow recovery in the event that the filter does crash. The highpass filter (HPF) and a

Page 3 2 Rear Panel Connectors The rear panel contains the following connectors:  Audio input o Four ANALOG inputs o S/PDIF input o TOSLINK opt