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13 

2.2 Fast Start 

 

Figure 2: Basic Enhancement Setup 

 
Fast start the MicroDAC IV as follows using Figure 2 as a guide: 
  
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. Note that the 

RIGHT (REF)

 signal is 

only used in stereo configuration and/or with the 2CH Adaptive filter. 

 

Table 1: MicroDAC IV Input Connections 

 

MODE 

LEFT (PRI) Input 

RIGHT (REF) Input 

1CH 

Preamp output 

Unused 

2CH 

Preamp output 

TV/radio output 

1CH STereo 

Left preamp output 

Right preamp 

output 

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 the enhanced audio, connect the line-level audio inputs (TAPE IN jacks) of 

your Enhanced Tape Recorder to the 

LEFT

 and 

RIGHT ANALOG OUTPUT

 jacks on the 

MicroDAC IV rear panel as shown. Alternatively, the digital output stream may be directly 
recorded by connecting the 

44.1KHz DIGITAL OUTPUT

 to the digital input of the DAT 

recorder. 

 
3.  Turn the phones 

VOLUME

 control to 

MIN,

 then connect the stereo headphones to the 

PHONES

 

jack. 

 
4.  Rotate both 

INPUT

 

LEVEL

 knobs located on the front panel fully counter-clockwise and power 

the MicroDAC IV on. Switch the front panel 

MODE

 switch to 

BYPASS

, so the signal input will 

flow directly to the output without being altered.  As the source audio (live or recorded) plays, 
adjust the front panel 

INPUT LEVEL

 knobs clockwise until the tricolor 

INPUT LEVEL

 LEDs flash 

Содержание MicroDAC IV

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

Страница 2: ......

Страница 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...

Страница 4: ......

Страница 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...

Страница 6: ...6...

Страница 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...

Страница 8: ...8...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 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...

Страница 22: ...22...

Страница 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...

Страница 24: ...24...

Страница 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...

Страница 26: ...26...

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