Digital Audio Corporation MicroDAC IV User Manual Download Page 24 | Manualshive

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Summary of Contents for MicroDAC IV

Page 1: ...MicroDAC IV PORTABLE PROGRAMMABLE DIGITAL FILTER USER S MANUAL DIGITAL AUDIO CORPORATION A DRI COMPANY...

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Page 3: ...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 digitalaudiocompan...

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Page 5: ...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...

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Page 7: ...nections 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 Table 5 2CH MODE Second Stage Factory Prese...

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Page 9: ...indows programming software which allows easy intuitive reprogramming of filters for specific applications Crash Detect which will automatically clear the adaptive filter should it crash Reference Com...

Page 10: ...rogramming 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: ...describe typical setups and provide an overview of adaptive filters to ease the selection of the best filter in a particular situation 2 1 Controls and Connectors Figure 1 MicroDAC IV Panels Refer to...

Page 12: ...e Figure 1 illustration of the rear panel features described as follows The POWER connector mates to a 2 1 mm barrel plug To power the unit connect the external AC power adapter to the POWER connector...

Page 13: ...put A D Mono configurations Preamp output TV radio output if 2CH Adaptive filter programmed unused otherwise A D Stereo configurations Left preamp output Right preamp output 2 If you wish to record th...

Page 14: ...he 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 m...

Page 15: ...r is used primarily for live radio TV removal If the incoming audio from a microphone is corrupted by interfering audio from a radio or television a second radio TV tuned to the same channel can be us...

Page 16: ...prevent the signal from distorting on overload The signal then enters the first stage 1CH Adaptive filter which is configured as follows Table 2 1CH MODE First Stage Factory Presets Parameter Preset...

Page 17: ...ow frequency noises that may remain after processing and 3200Hz Lowpass filtered to remove high frequency hiss Finally a 10dB AGC is applied to correct for near party far party talkers and to provide...

Page 18: ...ge Factory Presets Parameter Preset Value Filter Size 3472 taps Delay Channel Input Primary Delay 100 samples Adapt Rate 16 Adapt Mode Auto Output Residue Algorithm LMS Reference Compensation Enabled...

Page 19: ...imiter internally links the two channels such that an overload on either input channel will cause the levels to be reduced equally on both channels This maintains a proper stereo effect on the two sig...

Page 20: ...ware User s Manual for complete details on programming filter modes A D Table 7 Programmable MODE A Factory Presets Parameter Preset Value Limiter Disabled Filter Size 3600 taps Delay Channel Input Pr...

Page 21: ...Enabled Crash Detect Enabled 200 Hz Highpass Filter Enabled Lowpass Filter 3200 Hz Cutoff AGC Disabled Table 10 Programmable MODE D Factory Presets Parameter Preset Value Limiter Enabled Filter Size 3...

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Page 23: ...mware 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 soft...

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Page 25: ...A D and D A Conversion 12 kHz sample rate 35Hz to 5 4kHz bandwidth Level Front panel tricolor LED red 3 dB Indication orange 9 dB green 15 dB 6 2 Digital Microprocessor TMS320C6201 at 1600 MIPS Comput...

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