User`s manual

1.0 OVERVIEW

1.1 Introduction

The MicroDAC IV is a portable, programmable digital filter targeted for applications requiring

unattended filter deployment. A replacement for the venerable MicroDAC III, this powerful

signal processor is fully self-contained and features:

• Easy setup and operation

• Operation with live voice signals, cassette and microcassette tape recorders, video cassette

recorders, telephone taps, and radio receivers

• 12VDC power input enables operation from AC power (external adaptor included) or from

12V automotive battery system

• Compact enclosure (1.5” H x 7.3”W x 10.0”D)

• Fixed bandwidth of 5.4kHz

• Three factory preset adaptive filtering modes

• Four programmable filtering modes

Key Features

• Stereo processing capability, in addition to standard monaural

• Windows 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 Compensation, which automatically adjusts the RIGHT (REF) input level as

necessary to avoid coefficient saturation and maintain optimum cancellation

• Auto Mu, which maintains adaptive filter stability by automatically scaling adapt rate for both

input signal power and filter size

• Both standard LMS (Least Mean Square) and LAV (Least Absolute Value) adaptation

algorithms available

• EXTERNAL CLEAR connector, which allows manual clearing of the adaptive filter by remote

switch closure

• Dynamically partitionable filter array, which allows combining large and small filters in series

• Input Limiter, which automatically reduces input levels on overload

• AGC, which automatically boosts level of processed signal prior to output

• Digital Output (S/PDIF format) for recording directly to DAT