參數(shù)資料
型號： UDA1380
英文描述： Stereo audio coder-decoder for MD, CD and MP3
中文描述： 立體聲音頻編碼器，可用于MD，CD和MP3解碼器
文件頁數(shù)： 47/68頁
文件大小： 278K
代理商： UDA1380
2002 Sep 16
47
Philips Semiconductors
Product specification
Stereo audio coder-decoder
for MD, CD and MP3
UDA1380
11.14 AGC settings
Table 60
Register address 23H
Table 61
Description of register bits
Table 62
AGC time constant setting bits
BIT
15
0
14
0
13
0
12
0
11
0
10
9
8
Symbol
Default
AGC_TIME2
0
AGC_TIME1
0
AGC_TIME0
0
BIT
7
0
6
0
5
0
4
0
3
2
1
0
0
Symbol
Default
AGC_LEVEL1
0
AGC_LEVEL0
0
AGC_EN
0
BIT
SYMBOL
DESCRIPTION
15 to 11
10 to 8
AGC_TIME[2:0]
Default value 00000.
AGC time constant settings.
A 3-bit value to set the AGC time constants, being the
attack and decay time constants. The given constants are for 44.1 and 8 kHz
sampling frequencies, and must be scaled either down or up according to the
sampling frequency used. Default value 000, see Table 62.
default value 0000
AGC target level settings.
A 2-bit value to set the AGC target level. Default value 00,
see Table 63.
default value 0
AGC enable control.
A 1-bit value to enable or disable the AGC. When the AGC is
enabled, the bit SKIP_DCFIL must be set to logic 0 to avoid disturbance on the output
signal due to the DC offset added in the ADC. When this bit is logic 0: AGC off,
manual gain control via the left and right decimator volume control. When this bit is
logic 1: AGC enabled, with manual microphone gain setting via VGA. Default value 0.
7 to 4
3 and 2
AGC_LEVEL[1:0]
1
0
AGC_EN
AGC_TIME2
AGC_TIME1
AGC_TIME0
AGC SETTING
44.1 kHz SAMPLING
8 kHz SAMPLING
ATTACK TIME
(ms)
DECAY TIME
(ms)
ATTACK TIME
(ms)
DECAY TIME
(ms)
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
11
16
11
16
21
11
16
21
100
100
200
200
200
400
400
400
61
88.2
61
88.2
116
61
88.2
116
551 (default)
551
1102
1102
1102
2205
2205
2205
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