TDA9874A Philips Semiconductors, TDA9874A Datasheet - Page 36

• Manufacturer Part Number: TDA9874A
• Description: Digital TV sound demodulator/decoder
• Manufacturer: Philips Semiconductors

Philips Semiconductors
Table 33 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
10.3.9
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 34 FM dematrix register (subaddress 11)
Table 35 Description of the FMMR bits
1999 Dec 03
Digital TV sound demodulator/decoder
IDSWFM
FMDSC23; FMDSC13
register; see Table 41.
BIT
7
7
6
5
4
3
2
1
0
FM
DE
0
0
0
0
1
M
ATRIX
SYMBOL
IDSWFM
FDMS2
FDMS1
FDMS0
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 37. With channel 2 in NICAM mode, mono (channel 1) is always
selected.
these 4 bits are not used and should be set to logic 0
Dematrixing characteristics select: the state of these 3 bits select the dematrixing
characteristics; see Table 36
FMDSC22; FMDSC12
(FMMR)
5
0
0
0
1
1
0
4
0
36
FMDSC21;FMDSC11
3
0
DESCRIPTION
0
1
0
1
0
FDMS2
2
FDMS1
Preliminary specification
DE-EMPHASIS
1
TDA9874A
J17
50 s
60 s
75 s
off
(2)
FDMS0
(1)
0