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| AK4141 Datasheet, PDF (24/96 Pages) Asahi Kasei Microsystems – NICAM/A2/EIA-J Digital Stereo Decoder | |||
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[AK4141]
(2) ã²ã¤ã³è£æ£(EQ0)
ã¹ãã¬ãªå¼·èª¿æãã£ã«ã¿ã§çºçããæ¸è¡°ã Fç¹ã®åããè£æ£ãããããã£ã«ã¿ã§ããEqualizer (EQ0) 㨠ã²ã¤
ã³(0dB/+12dB/+24dB) ã§æ§æããã¾ããEQ0 ã®ä¿æ°ã E0A1[15-0], E0A2[15-0], E0B1[15-0], E0B2[15-0] bitsã§ã
ã²ã¤ã³ãGN1[1:0], GN2[1:0] bitsã§è¨å®ãã¾ãã(Table 9)
fs: ãµã³ããªã³ã°å¨æ³¢æ°
fc1: 極ã®å¨æ³¢æ°
fc2: é¶ç¹ã®å¨æ³¢æ°
K: ã²ã¤ã³[dB] (æ大+12dBã¾ã§è¨å®ã§ãã¾ãã)
ã¬ã¸ã¹ã¿è¨å® (Figure 15)
E0A1[15:0], E0A2[15:0] bits =A, E0B1[13:0], E0B2[13:0] bits =B, E0C1[15:0], E0C2[15:0] bits =C
(MSB=E0A115(E0A215),E0B113(E0B213), E0C115(E0C215); LSB=E0A10(E0A20), E0B10(E0B20),
E0C10(E0C20))
1 + 1 / tan (ï°fc2/fs)
A = 10K/20 x
,
1 + 1 / tan (ï°fc1/fs)
1 ï 1 / tan (ï°fc1/fs)
B=
,
1 + 1 / tan (ï°fc1/fs)
1 ï 1 / tan (ï°fc2/fs)
C =10K/20 x
1 + 1 / tan (ï°fc1/fs)
ä¼éé¢æ°
H(z) =
A + Cz ï1
1 + Bz ï1
Gain[dB]
K
fc1
fc2
Figure 16. EQ0 ã®å¨æ³¢æ°ç¹æ§
Frequency
GN1
GN0
Gain
0
0
0dB
(default)
0
1
+12dB
1
x
+24dB
Table 9. Gainé¨ã®ã²ã¤ã³è¨å® (x: Donât care)
MS0952-J-03
- 24 -
2013/12
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