TDA9875 Philips Semiconductors, TDA9875 Datasheet - Page 38

• Manufacturer Part Number: TDA9875
• Description: Digital TV Sound Processor DTVSP
• Manufacturer: Philips Semiconductors

Philips Semiconductors
10.3.6.2
Table 23 Description of subaddress 9 (notes 1 and 2)
Notes
1. It is recommended to switch the FM sound mode identification off whenever the received program is not a terrestrial
2. Switching the identification off will reset the associated hardware to a defined state.
10.3.7
10.3.7.1
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 FM stereo reception,
both groups must be set to the same characteristics.
10.3.7.2
Table 24 Subaddress 10 (note 1)
Note
1. The default setting at power-up is 00000000.
1998 Feb 13
CH1MODE
CH1WIDE
CH2MOD0,
CH2MOD1
IDAREA
IDMOD0,
IDMOD1
Digital TV Sound Processor (DTVSP)
7 (MSB)
0 (LSB)
NAME
2-carrier sound.
BIT
6
5
4
3
2
1
FM
Description
Description
Definition
DE
HIGH/LOW
-
EMPHASIS REGISTER
ADEEM2
ADEEM1
NAME
HIGH
HIGH
HIGH
LOW
LOW
LOW
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.
Switches the decimation filters for the first sound carrier to a wide bandwidth, so that the
main sound carrier of a satellite channel with its larger deviation can be handled without
additional distortion.
The bandwidth is narrow to cope with the intermodulation requirements of FM stereo.
These bits control the hardware for the second sound carrier in accordance with the
truth Table 21. The NICAM mode employs a wider bandwidth of the decimation filters
than the FM mode.
Selects FM identification frequencies in accordance with the specification for Korea.
Frequencies for Europe are selected (B/G and D/K standard).
These bits define the response time after which a sound mode identification result may
be expected. The longer the time, the more reliable the identification.
adaptive de-emphasis on/off
time constant selection for FM de-emphasis
adaptive de-emphasis on/off
time constant selection for FM de-emphasis
38
DESCRIPTION
FUNCTION
Preliminary specification
TDA9875