MicroDAC 5 User's Manual - Digital Audio Corporation

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MONO/STEREO settingBW settingnCH settingHPF in/outAGC in/outLOCK/UNLOCK stateOther settings cannot be overwritten in nonvolatile memory unless the unit isconnected to the PC and explicitly reprogrammed.5.11 Synchronizing to the MicroDAC 5Whenever the software connects to a MicroDAC 5 hardware unit,synchronization MUST occur to maintain consistency between what is displayedin the interface and what is currently running on the unit. The user has twochoices; either the software will push down to the hardware its current settings(changing what is currently running on the unit) OR the software will retrieve thecurrent settings directly from the hardware and update its interface accordingly(leaving the hardware essentially unchanged).Regardless of which option is selected, after the synchronization occurs the PCsoftware is in control and any changes made will be sent down to the hardwareunit.The user will be prompted to make a choice between these options each time aconnection is made.Upon disconnecting, the hardware will always revert to running whatever isstored in its nonvolatile memory. This may have the unintended side effect ofresetting any adaptive filters.5.12 Updating MicroDAC 5 FirmwareWhenever the software connects to a MicroDAC 5 unit, it will automatically checkto see if that unit is running the latest firmware. If the unit is not running the latestfirmware, the user will be prompted to update the firmware. The firmware updatewill take a few minutes.Also, the user can verify that the unit is running the latest firmware by choosingUpdate Firmware from the File menu, which will check the firmware version andnotify if an update is available.Page 24
6 FiltersTo configure a specific filter, click on that filter in the signal flow diagram on themain window. Doing so will open the configuration window for that filter. Notethat, in stereo configurations, the selected settings are always applied to bothchannels; you cannot choose different filter settings for the left and rightchannels.6.1 Reference Canceller (nCH) FilterThe Reference Canceller (nCH) adaptive filter is used to automatically cancelfrom the “primary” channel(s) any audio which matches one of the “reference”channels. For example, consider a signal containing microphone audio with thedesired voices masked by radio or TV sound. The radio/TV interference can becancelled in real-time if the original broadcast audio, usually available from asecond receiver, is simultaneously connected as a reference channel.As described in section 3.1.4, controls on the front panel can be used to definewhich input channels are primaries and which are references. These sameselections are available in the Channels menu within the PC software.When the MicroDAC 5 is running standalone (not connected to the PC), the filterruns at whatever settings are stored in the nonvolatile memory. When runningconnected to the PC, finer control is available. Figure 6-1 shows the filtercontrols available for the reference canceller. The window shown is for a 2CHfilter, but the same controls are available for 3CH and 4CH filters as well.If desired, this first filter can be run as a 1CH adaptive filter instead of a referencecancellation filter. If so, its available controls are identical to those described insection 6.2.Page 25
Page 1: Multi-Channel Reference CancellerUS
Page 7: 1 Overview1.1 IntroductionMicroDAC
Page 11: 3 Standalone ControlsControls on th
Page 14 and 15: 3.1.4.5 Clear FiltersUse the CLEAR
Page 16 and 17: Audio Output (1):o TOSLINK optical
Page 18 and 19: 5.3 FiltersFour different filters a
Page 20 and 21: Figure 5-3: Mono sub-menuIn mono mo
Page 22 and 23: Figure 5-6: Mono 4CH5.6.2 Stereo Co
Page 25 and 26: 5.6.3 Audio Line Out ConfigurationB
Page 27 and 28: are stored in nonvolatile memory on
Page 29: they are “out.” Taking one of t
Page 33 and 34: samples and in milliseconds. Minimu
Page 35 and 36: Slower adapt rates take longer to r
Page 37 and 38: Figure 6-4: Automatic Gain Control
Page 39 and 40: 7 InstallationTo install the MicroD
Page 41 and 42: 3. After the .NET install completes
Page 43 and 44: 7. Next, before running the MicroDA
Page 45 and 46: d. Once the driver has finished ins
Page 47 and 48: 3. You will be presented with a “
Page 49 and 50: 7. You may see another “unidentif

MicroDAC 5 User's Manual - Digital Audio Corporation

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