TDA9875A Philips Semiconductors, TDA9875A Datasheet - Page 55

• Manufacturer Part Number: TDA9875A
• Description: Digital TV Sound Processor DTVSP
• Manufacturer: Philips Semiconductors

Philips Semiconductors
10.3.22 A
Switching the AVL off will reset the associated hardware to a defined state. When the signal source for the Main channel
is changed while the AVL is on, the AVL needs to be reset in order to avoid excessive settling times. This can be achieved
by switching the AVL off and on again.
The pseudo stereo function is based on an all-pass filter. A 90 degrees phase shift occurs at the frequencies stated in
Table 57. There is a gain of 3 dB in the left audio channel.
Table 55 Subaddress 25 (note 1)
Note
1. The default setting at power-up is 0000 0000.
Table 56 Spatial control setting
Table 57 Pseudo control setting
Table 58 AVL control mode
1999 Dec 20
7 (MSB)
Digital TV Sound Processor (DTVSP)
0 (LSB)
BIT
6
5
4
3
2
1
B5
B3
B1
0
0
1
1
0
0
1
1
0
0
1
1
UDIO EFFECTS REGISTER
PSEUDO1
PSEUDO0
SPATIAL1
SPATIAL0
NAME
AVL1
AVL0
B7
B6
B4
B2
B0
VALUE
0
1
0
1
0
1
0
1
0
1
0
1
0
0
(M
AIN
Default value.
Default value.
These bits set the amount of the effect function (stereo base width expansion)
for stereo signals in the Main channel (see Table 56). This function should be
activated only in accordance with the result of the sound mode identification.
These bits set the amount of the effect function (pseudo stereo) for mono
signals in the Main channel (see Table 57). This function should be activated
only in accordance with the result of the sound mode identification.
These bits set the mode of operation of the automatic volume level control
function at the entrance to the Main (loudspeaker) channel (see Table 58).
)
55
PSEUDO SETTING (Hz)
SPATIAL SETTING (%)
DESCRIPTION
medium decay
AVL MODE
short decay
long decay
off/reset
300
200
150
off
30
40
52
off
Product specification
TDA9875A