This is a design circuit for noise reduction system. This circuit is based on LM1894. This is a simple circuit. This is the figure of the circuit;
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.
[Circuit source: National Semiconductor Notes]
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