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LM1894 Datasheet

  • LM1894

  • Dynamic Noise Reduction System DNR

  • 10頁(yè)

  • NSC

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LM1894 Dynamic Noise Reduction System DNR
December 1994
LM1894
Dynamic Noise Reduction System DNR
廬
General 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 compo-
nents required.
n
Compatible with all prerecorded tapes and FM
n
10 dB effective tape noise reduction CCIR/ARM
weighted
n
Wide supply range, 4.5V to 18V
n
1 Vrms input overload
Applications
n
n
n
n
n
Automotive radio/tape players
Compact portable tape players
Quality HI-FI tape systems
VCR playback noise reduction
Video disc playback noise reduction
Features
n
Non-complementary noise reduction, 鈥渟ingle ended鈥?/div>
n
Low cost external components, no critical matching
Typical Application
DS007918-1
*R1 + R2 = 1 k鈩?total.
See Application Hints.
Order Number LM1894M or LM1894N
See NS Package Number M14A or N14A
FIGURE 1. Component Hook-Up for Stereo DNR System
DNR
廬
is a registered trademark of National Semiconductor Corporation.
The DNR
廬
system is licensed to National Semiconductor Corporation under U.S. patent 3,678,416 and 3,753,159.
Trademark and license agreement required for use of this product.
漏 1999 National Semiconductor Corporation
DS007918
www.national.com

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