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AK4141 Datasheet, PDF (61/96 Pages) Asahi Kasei Microsystems – NICAM/A2/EIA-J Digital Stereo Decoder | |||
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CONFIDENTIAL
[AK4141]
Addr
Register Name
D7
D6
D5
D4
D3
D2
D1
D0
47H FM/DQPSK Dem Ctrl
0
DM2LP[1:0] DM2MD
0
R/W
R/W R/W R/W R/W R/W R/W R/W R/W
Default
0
0
0
0
0
0
0
0
DM2MD
Demod 2 FM/DQPSK modeãASDãåä½ãã¦ããéã¯ãããã®ãããã¯ç¡è¦ããã¾ãã
DM2MD
0
1
Demod 2 FM/DQPSK Mode
FM
DQPSK
Table 50. Automatic system detection
(default)
DM2LP[1:0]
Demod 2ãã£ã«ã¿ã®é¸æãASDãåä½ãã¦ããéã¯ãããã®ãããã¯ç¡è¦ããã¾ãã
DM2LP[1:0]
00
01
10
11
Demod 2 Filter
50 kHz lowpass
728kbit/s Root Raised Cosine 40% rolloff lowpass
728kbit/s Root Raised Cosine 100% rolloff lowpass
Reserved
Table 51. Demod 2ãã£ã«ã¿
(default)
Addr
Register Name
D7
D6
D5
D4
D3
D2
D1
D0
48H Dem2 Carrier Freq Ctrl 1
DM2F[15:8]
49H Dem2 Carrier Freq Ctrl 0
DM2F[7:0]
R/W
R/W R/W R/W R/W R/W R/W R/W R/W
Default
0
0
0
0
0
0
0
0
DM2F[15:0]
Demod 1ãã£ãªã¢å¨æ³¢æ°ãASDãåä½ãã¦ããéã¯ãããã®ãããã¯ç¡è¦ããã¾ãããã®å¤ã¯ãã£ãªã¢
ã0Hzã«ããããã«å¿
è¦ã¨ãããå¨æ³¢æ°ã·ããéã表ããé常ã¯è² ã®å¤ãåãã¾ããæ£ã®å¤ã¯ãã£ãªã¢
ãä¸æããã¾ãã
DM2F = -Fc/Fs x 216 (in 2âs complement)
Fc = åç®ä¸ã®ãã£ãªã¢å¨æ³¢æ° (Hz)
Fs = å
¥åãµã³ãã«ã¬ã¼ã(Hz)ããµã³ãã«ã¬ã¼ãã¬ã¸ã¹ã¿åç
§ãTable 52 ã«Typicalå¤ã表ãã¾ãã
Standard Values for Fc
4.724212MHz
5.7421875MHz
5.85MHz
6.2578125MHz
6.552MHz
6.7421875MHz
DM2F[15:0]
fs=48kHz/32kHz
0xBE63
0xB03F
0xAEC0
0xA916
0xA500
0xA25C
Table 52. Demod 2 carrier frequency
fs=44.1kHz
0xB895
0xA932
0xA791
0xA166
0x9CF4
0x9A14
(default)
MS0952-J-03
- 61 -
2013/12
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