tda9870ah NXP Semiconductors, tda9870ah Datasheet - Page 52

• Manufacturer Part Number: tda9870ah
• Description: Digital Tv Sound Processor Dtvsp
• Manufacturer: NXP 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 52. There is a gain of 3 dB in the left audio channel.
Table 50 Subaddress 25 (note 1)
Note
1. The default setting at power-up is 00000000.
Table 51 Spatial control setting
Table 52 Pseudo control setting
Table 53 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
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 51). 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 52). 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 53).
52
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
TDA9870A