General Description

The LM832 is a stereo noise reduction circuit for use with

audio playback systems. The DNR system is noncomplementary, 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.

The LM832 is optimized for low voltage operation with input

levels around 30 mVrms.

For higher input levels use the LM1894.

Features

- Low voltage battery operation

- 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, 1.5V to 9V

- 150 mVrms input overload

- No royalty requirements

- Cascade connection for 17 dB noise reduction

Applications

- Headphone stereo

- Microcassette players

- Radio cassette players

- Automotive radio/tape players