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.