20
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.
Finally, a 10dB AGC is applied to correct for near party / far party talkers, and to provide a good
output level for recording.
3.4 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.
Table 7: Programmable MODE A Factory Presets
Parameter
Preset Value
Limiter
Disabled
Filter Size
3600 taps
Delay Channel
Input (Primary)
Delay
100 samples
Adapt Rate
16
Adapt Mode
Auto
Output
Residue
Algorithm
LMS
Reference Compensation
Enabled
Crash Detect
Enabled
200 Hz Highpass Filter
Disabled
Lowpass Filter
Disabled
AGC
Disabled
Table 8: Programmable MODE B Factory Presets
Parameter
Preset Value
Limiter
Enabled
Filter Size
3600 taps
Delay Channel
Input (Primary)
Delay
100 samples
Adapt Rate
16
Adapt Mode
Auto
Output
Residue
Algorithm
LMS
Reference Compensation
Enabled
Crash Detect
Enabled
200 Hz Highpass Filter
Enabled
Lowpass Filter
Disabled
AGC
Disabled
