tda9874aps NXP Semiconductors, tda9874aps Datasheet - Page 28

• Manufacturer Part Number: tda9874aps
• Description: Digital Tv Sound Demodulator/decoder
• Manufacturer: NXP Semiconductors

Philips Semiconductors
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
7.3.9
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
2000 Aug 04
FMDSC23
FMDSC13
Digital TV sound demodulator/decoder
IDSWFM
register; see Table 39.
BIT
0
0
0
0
1
7
7
6
5
4
3
2
1
0
FM
DE
M
FMDSC22
FMDSC12
ATRIX
SYMBOL
IDSWFM
FDMS2
FDMS1
FDMS0
0
0
1
1
0
6
0
R
EGISTER
Automatic FM-dematrix switching: if set to logic 1, the FM dematrix is switched
automatically in dependence on the current FM identification 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.
these bits are not used and should be set to logic 0
Dematrixing characteristics select: the state of these bits select the dematrixing
characteristics; see Table 34.
FMDSC21
FMDSC11
(FMMR)
0
1
0
1
0
5
0
4
0
28
3
0
DESCRIPTION
DE-EMPHASIS
FDMS2
J17
50 s
60 s
75 s
off
2
(2)
(1)
FDMS1
1
Product specification
TDA9874A
FDMS0
0