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參數(shù)資料
| 型號： | LM832N |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | LM832 Dynamic Noise Reduction System DNR |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PDIP14 |
| 封裝： | PLASTIC, DIP-14 |
| 文件頁數(shù)： | 7/11頁 |
| 文件大?。?/td> | 225K |
| 代理商： | LM832N |
Application Hints
(Continued)
TL/H/5176–15
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FIGURE 15. Monaural Cascade Connection
FM STEREO
When using the DNR system with FM stereo as the audio
source, it is important to eliminate the ultrasonic frequencies
that accompany the audio. If the radio has a multiplex filter
to remove the ultrasonics there will be no problem.
This filtering can be done at the output of the demodulator,
before the DNR system, or in the DNR system control path.
Standard audio multiplex filters are available for use at the
output of the demodulator from several filter companies.
Figure 16 shows the additional components L1, C15 and
C16 that are added to the control path for FM stereo appli-
cations. The coil must be tuned to 19 kHz, the FM pilot
frequency.
TL/H/5176–16
FIGURE 16. FM Stereo Application
FOR FURTHER READING
Tape Noise Levels
1. ‘‘A Wide Range Dynamic Noise Reduction System’’
Blackmer, ‘dB’ Magazine, August-September 1972, Volume
6,
Y
8.
2. ‘‘Dolby B-Type Noise Reduction System’’, Berkowitz and
Gundry, Sert Journal, May-June 1974, Volume 8.
3. ‘‘Cassette vs Elcaset vs Open Reel’’, Toole, Audioscene
Canada, April 1978.
4. ‘‘CCIR/ARM: A Practical Noise Measurement Method’’,
Dolby, Robinson, Gundry, JAES, 1978.
Noise Masking
1. ‘‘Masking and Discrimination’’, Bos and De Boer, JAES,
Volume 39,
Y
4, 1966.
2. ‘‘The Masking of Pure Tones and Speech by White
Noise’’, Hawkins and Stevens, JAES, Volume 22,
Y
1, 1950.
3. ‘‘Sound System Engineering’’, Davis, Howard W. Sams
and Co.
4. ‘‘High Quality Sound Reproduction’’, Moir, Chapman Hall,
1960.
5. ‘‘Speech and Hearing in Communication’’, Fletcher, Van
Nostrand, 1953.
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