tda9870ah NXP Semiconductors, tda9870ah Datasheet - Page 39

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

Philips Semiconductors
Table 23 Channel 2 receive mode
10.3.7
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 24 Subaddress 10 (note 1)
Notes
1. The default setting at power-up is 00000000.
2. The FM de-emphasis gain is 0 dB at 40 Hz.
Table 25 De-emphasis sound carrier 2
1999 Dec 20
7 (MSB)
0 (LSB)
Digital TV Sound Processor (DTVSP)
BIT
B6
6
5
4
3
2
1
0
0
0
0
1
B3
0
0
1
FM
DE
ADEEM2
ADEEM1
NAME
-
EMPHASIS REGISTER
B6
B5
B4
B2
B1
B0
B5
0
0
1
1
0
B2
VALUE
0
1
0
B4
1
0
1
0
0
1
0
1
0
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 s (note 2).
The adaptive de-emphasis is off.
Time constant selection for FM de-emphasis (see Table 25).
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 s (note 2).
The adaptive de-emphasis is off.
Time constant selection for FM de-emphasis (see Table 26).
39
75 s (M standard)
DE-EMPHASIS
DESCRIPTION
50 s (Europe)
CHANNEL 2
don’t care
60 s
J17
FM
AM
off
Product specification
TDA9870A