參數(shù)資料
型號(hào)： TDA9875A
廠商： NXP SEMICONDUCTORS
元件分類： 消費(fèi)家電
英文描述： Digital TV Sound Processor DTVSP
中文描述： SPECIALTY CONSUMER CIRCUIT, PDIP64
封裝： SHRINK, PLASTIC, DIP
文件頁數(shù)： 39/96頁
文件大小： 296K
代理商： TDA9875A
1999 Dec 20
39
Philips Semiconductors
Product specification
Digital TV Sound Processor (DTVSP)
TDA9875A
10.3.5
C
ARRIER
2
FREQUENCY REGISTER
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 either the second FM sound carrier of a terrestrial or satellite FM program or the NICAM sound carrier.
10.3.6
D
EMODULATOR CONFIGURATION REGISTER
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 21
Subaddress 9 (note 1)
Notes
1.
The default setting at power-up is 0000 0000.
Table 22
Identification mode
Table 23
Filter bandwidth channel 1 and channel 2
BIT
NAME
VALUE
DESCRIPTION
7 (MSB)
6
IDMOD1
IDMOD0
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 22)
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 23)
channel 2 receive mode: these bits control the hardware for the second sound
carrier (see Table 24); the NICAM mode employs a wider bandwidth of the
decimation filters than the FM mode
selects the filter bandwidth (see Table 23)
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
5
IDAREA
1
0
4
3
2
FILTBW1
CH2MOD1
CH2MOD0
1
FILTBW0
CH1MODE
1
0
0 (LSB)
B7
B6
IDENT MODE
0
0
1
1
0
1
0
1
slow
medium
fast
off/reset
B4
B1
FILTER
BANDWIDTH
FILTER MODES
CH1
CH2
0
0
narrow
narrow
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
0
1
extra wide
narrow
1
1
0
1
medium
wide
medium
wide
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