參數(shù)資料
型號： TDA9874APS
廠商： NXP SEMICONDUCTORS
元件分類： 接收器
英文描述： Digital TV sound demodulator/decoder
中文描述： AM/FM, AUDIO DEMODULATOR, PDIP42
封裝： 0.600 INCH, SHRINK, PLASTIC, MS-020, SOT-270-1, DIP-42
文件頁數(shù)： 35/68頁
文件大小： 231K
代理商： TDA9874APS
1999 Dec 03
35
Philips Semiconductors
Preliminary specification
Digital TV sound demodulator/decoder
TDA9874A
Table 30
Filter bandwidth for channel 1 and channel 2; note 1
Note
1.
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.
10.3.8
FM D
E
-
EMPHASIS
R
EGISTER
(FMDR)
This register should not be used when applying ESP. This register is used to select the proper de-emphasis
characteristicsasappropriateforthestandardofthereceivedcarrier.Bits 3 to 0applytosoundcarrier 1,bits 7 to 4apply
to sound carrier 2. In the event of A2 reception, both groups must be set to the same characteristics.
The default setting after power-on reset is ‘0000 0000’.
Table 31
FM De-emphasis register (subaddress 10)
Table 32
Description of the FMDR bits
FILTBW1
FILTBW0
FILTER BANDWIDTH
FILTER MODES
CHANNEL 1
CHANNEL 2
0
0
narrow
narrow
Recommended for nominal terrestrial broadcast
conditions and SAT with 2 carriers
Recommended for highly overmodulated single FM
carriers. Only channel 1 is available for FM
demodulation in this mode. NICAM can still be
processed on channel 2.
Recommended for moderately overmodulated
broadcast conditions
Recommended for strongly overmodulated broadcast
conditions
0
1
extra wide
narrow
1
0
medium
medium
1
1
wide
wide
7
6
5
4
3
2
1
0
ADEEM2
FMDSC23
FMDSC22
FMDSC21
ADEEM1
FMDSC13
FMDSC12
FMDSC11
BIT
SYMBOL
DESCRIPTION
7
ADEEM2
Adaptive de-emphasis on/off sound carrier 2:
when ADEEM2 = 1 it activates the
adaptive de-emphasis function (for Wegener-Panda 1 encoded programs), which is
required for certain satellite FM channels. The standard FM de-emphasis must then be
set to 75
μ
s. When ADEEM2 = 0, the adaptive de-emphasis is off.
FM de-emphasis:
the state of these 3 bits determines the FM de-emphasis for sound
carrier 2; see Table 33.
6
5
4
3
FMDSC23
FMDSC22
FMDSC21
ADEEM1
Adaptive de-emphasis on/off sound carrier 1:
when ADEEM1 = 1 it activates the
adaptive de-emphasis function (for Wegener-Panda 1 encoded programs), which is
required for certain satellite FM channels. The standard FM de-emphasis must then be
set to 75
μ
s. When ADEEM1 = 0, the adaptive de-emphasis is off.
FM de-emphasis:
the state of these 3 bits determines the FM de-emphasis for sound
carrier 1; see Table 33.
2
1
0
FMDSC13
FMDSC12
FMDSC11
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