參數(shù)資料
型號(hào)： TDA9875AH
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, PQFP64
封裝： PLASTIC, QFP
文件頁(yè)數(shù)： 40/96頁(yè)
文件大?。?/td> 296K
代理商： TDA9875AH
1999 Dec 20
40
Philips Semiconductors
Product specification
Digital TV Sound Processor (DTVSP)
TDA9875A
Table 24
Channel 2 receive mode
10.3.7
FM
DE
-
EMPHASIS REGISTER
This register is used to select the proper de-emphasis characteristics as appropriate for the standard of the received
carrier. Bits B3 to B0 apply to sound carrier 1, bits B7 to B4 apply to sound carrier 2.
In the event of A2 reception, both groups must be set to the same characteristics.
Table 25
Subaddress 10 (note 1)
Note
1.
2.
The default setting at power-up is 0000 0000.
The FM de-emphasis gain is 0 dB at 40 Hz.
Table 26
De-emphasis sound carrier 2
Table 27
De-emphasis sound carrier 1
B3
B2
CHANNEL 2
0
0
1
0
1
0
FM
AM
NICAM
BIT
NAME
VALUE
DESCRIPTION
7 (MSB)
ADEEM2
1
Activates the adaptive de-emphasis function, which is required for certain satellite
FM channels. The standard FM de-emphasis must then be set to 75
μ
s (note 2).
The adaptive de-emphasis is off.
Time constant selection for FM de-emphasis (see Table 26).
0
6
5
4
3
B6
B5
B4
ADEEM1
1
Activates the adaptive de-emphasis function, which is required for certain satellite
FM channels. The standard FM de-emphasis must then be set to 75
μ
s (note 2).
The adaptive de-emphasis is off.
Time constant selection for FM de-emphasis (see Table 27).
0
2
1
B2
B1
B0
0 (LSB)
B6
B5
B4
DE-EMPHASIS
50
μ
s (Europe)
60
μ
s
75
μ
s (M standard)
J17
off
0
0
0
0
1
0
0
1
1
0
0
1
0
1
0
B2
B1
B0
DE-EMPHASIS
50
μ
s (Europe)
60
μ
s
0
0
0
0
0
1
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