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參數資料
| 型號： | 935263704518 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 接收器 |
| 英文描述： | AM/FM, AUDIO DEMODULATOR, PQFP44 |
| 封裝： | PLASTIC, QFP-44 |
| 文件頁數： | 21/71頁 |
| 文件大小： | 304K |
| 代理商： | 935263704518 |
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2000 Aug 04
28
Philips Semiconductors
Product specication
Digital TV sound demodulator/decoder
TDA9874A
Table 31 De-emphasis
Notes
1. The FM de-emphasis gain is 0 dB at 40 Hz.
2. Not used in any known terrestrial TV sound standard. NICAM de-emphasis is selected in the NICAM configuration
register; see Table 39.
7.3.9
FM DEMATRIX REGISTER (FMMR)
This register is used to select the proper dematrixing characteristics as appropriate for the standard of the received
carrier and the related sound mode identification. For the dematrixing, it is assumed that the output from sound carrier 1
is on channel 1 input. Bits 3 to 6 are not used.
The default setting after Power-on reset is 0000 0000.
Table 32 FM dematrix register (subaddress 11)
Table 33 Description of the FM dematrix register bits
FMDSC23
FMDSC22
FMDSC21
DE-EMPHASIS(1)
FMDSC13
FMDSC12
FMDSC11
000
50
s
001
60
s
010
75
s
011
J17(2)
100
off
76543210
IDSWFM
0
FDMS2
FDMS1
FDMS0
BIT
SYMBOL
DESCRIPTION
7
IDSWFM
Automatic FM-dematrix switching: if set to logic 1, the FM dematrix is switched
automatically in dependence on the current FM identication result. In case of stereo,
the type of stereo dematrixing (Europe or Korea) is determined by bit IDAREA in
subaddress 9. Bits FDMS2, FDMS1 and FDMS0 are ignored and the dematrix output is
set according to Table 35. With channel 2 in NICAM mode, mono (channel 1) is always
selected.
6
these bits are not used and should be set to logic 0
5
4
3
2
FDMS2
Dematrixing characteristics select: the state of these bits select the dematrixing
characteristics; see Table 34.
1
FDMS1
0
FDMS0
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