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| SM5950AM Datasheet, PDF (14/20 Pages) Nippon Precision Circuits Inc – Asynchronous Sample Rate Converter | |||
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SM5950AM
Deemphasis (DEEM)
Basic deemphasis ï¬lters are realized using analog circuit conï¬gurations. Here, an IIR digital deemphasis ï¬lter
conï¬guration faithfully reproduces the gain and phase characteristics of an analog deemphasis ï¬lter. The ï¬lter
coefï¬cients are set by pins FS0 and FS1 for 3 input sampling frequencies (fsi) of 44.1kHz, 48.0kHz, and
32.0kHz.
Deemphasis ON/OFF
DEEM
L
H
Deemphasis
OFF
ON
Deemphasis ï¬lter coefï¬cient selection
The deemphasis ï¬lter is selected by pins FS0 and FS1.
FS0
FS1
fsi
L
L
44.1kHz
H
L
44.1kHz
L
H
48.0kHz
H
H
32.0kHz
Deemphasis ï¬lter characteristics
0.0
-2.0
-4.0
-6.0
-8.0
-10.0
-12.0
10
100
1000
10000
Frequency [Hz]
Figure 2. Deemphasis ï¬lter frequency characteristics
44.1kHz
48kHz
32kHz
100000
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
10
32kHz
44.1kHz
48kHz
100
1000
10000
Frequency [Hz]
Figure 3. Deemphasis ï¬lter phase characteristics
100000
NIPPON PRECISION CIRCUITS INC.â14
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