參數(shù)資料
型號(hào)： TDA9875A
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, PDIP64
封裝： SHRINK, PLASTIC, DIP
文件頁(yè)數(shù)： 55/96頁(yè)
文件大小： 296K
代理商： TDA9875A
1999 Dec 20
55
Philips Semiconductors
Product specification
Digital TV Sound Processor (DTVSP)
TDA9875A
10.3.22 A
UDIO EFFECTS REGISTER
(M
AIN
)
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
BIT
NAME
VALUE
DESCRIPTION
7 (MSB)
6
5
4
B7
B6
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 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).
SPATIAL1
SPATIAL0
3
2
PSEUDO1
PSEUDO0
1
AVL1
AVL0
0 (LSB)
B5
B4
SPATIAL SETTING (%)
0
0
1
1
0
1
0
1
off
30
40
52
B3
B2
PSEUDO SETTING (Hz)
0
0
1
1
0
1
0
1
off
300
200
150
B1
B0
AVL MODE
0
0
1
1
0
1
0
1
off/reset
short decay
medium decay
long decay
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