tda9870ah NXP Semiconductors, tda9870ah Datasheet - Page 38

• Manufacturer Part Number: tda9870ah
• Description: Digital Tv Sound Processor Dtvsp
• Manufacturer: NXP Semiconductors

Philips Semiconductors
10.3.5
Same as for sound carrier 1, except for subaddresses (subaddresses 6 to 8). If the carrier 2 frequency register is used,
it will be for the second FM sound carrier of a terrestrial or satellite FM program.
10.3.6
It is recommended to switch the FM sound mode identification off whenever the received program is not a terrestrial
2-carrier sound. Switching the identification off will reset the associated hardware to a defined state.
Table 20 Subaddress 9 (note 1)
Note
1. The default setting at power-up is 00000000.
Table 21 Identification mode
Table 22 Filter bandwidth channel 1 and channel 2
1999 Dec 20
Digital TV Sound Processor (DTVSP)
7 (MSB)
0 (LSB)
BIT
B7
B4
6
5
4
3
2
1
0
0
1
1
0
0
1
1
C
D
ARRIER
EMODULATOR CONFIGURATION REGISTER
CH1MODE
CH2MOD1
CH2MOD0
FILTBW1
FILTBW0
IDMOD1
IDMOD0
IDAREA
NAME
2
B6
B1
0
1
0
1
0
1
0
1
FREQUENCY REGISTER
extra wide
VALUE
medium
narrow
wide
CH1
1
0
1
0
BANDWIDTH
FILTER
these bits define the response time after which a FM sound mode identification
result may be expected; the longer the time, the more reliable the identification
(see Table 21)
selects FM identification frequencies in accordance with the specification for
Korea
selects frequencies for Europe (B/G and D/K standard)
selects filter bandwidth (see Table 22)
channel 2 receive mode: these bits control the hardware for the second sound
carrier (see Table 23)
selects filter bandwidth (see Table 22)
selects the hardware for the first sound carrier to operate in AM mode
FM mode is assumed; this applies to both terrestrial and satellite FM reception
medium
narrow
narrow
wide
CH2
recommended for nominal terrestrial broadcast conditions and
SAT with 2 carriers
recommended only for high-deviation SAT mono carriers
(e.g. obsolete Main channel on Astra)
recommended for moderately overmodulated broadcast conditions
recommended for strongly overmodulated broadcast conditions
38
IDENT MODE
medium
off/reset
DESCRIPTION
slow
fast
FILTER MODES
Product specification
TDA9870A