1FEATURES

2• Non-Complementary Noise Reduction, “Single

Ended”

• Low Cost External Components, No Critical

Matching

• Compatible with All Prerecorded Tapes and

FM

• 10 dB Effective Tape Noise Reduction

CCIR/ARM Weighted

• Wide Supply Range, 4.5V to 18V

• 1 Vrms Input Overload

APPLICATIONS

• Automotive Radio/Tape Players

• Compact Portable Tape Players

• Quality HI-FI Tape Systems

• VCR Playback Noise Reduction

• Video Disc Playback Noise Reduction

DESCRIPTION

The LM1894 is a stereo noise reduction circuit for use

with audio playback systems. The DNR system is

non-complementary, meaning it does not require

encoded source material. The system is compatible

with virtually all prerecorded tapes and FM

broadcasts. Psychoacoustic masking, and an

adaptive bandwidth scheme allow the DNR to

achieve 10 dB of noise reduction. DNR can save

circuit board space and cost because of the few

additional components required.