參數(shù)資料
型號(hào)： STAC9708
廠商： Electronic Theatre Controls, Inc.
元件分類： Codec
英文描述： Multi-Channel AC97 Codec With Multi-Codec Option
中文描述： 多聲道AC97編解碼器與多編解碼器方案
文件頁(yè)數(shù)： 28/56頁(yè)
文件大?。?/td> 247K
代理商： STAC9708
SigmaTel, Inc.
Preliminary
STAC9708/11
28
10/02/98
Table 10
. PC_BEEP Register
MUTE
PV3…PV0
FUNCTION
0
0000
0 dB Attenuation
0
1111
45 dB Attenuation
1
xxxx
∞
dB Attenuation
4.4.4 Analog Mixer Input Gain Registers (Index 0Ch - 18h, 04h)
These registers control the gain/attenuation for each of the analog inputs. Each step corresponds to
approximately 1.5 dB. The MSB of the register is the mute bit. When this bit is set to 1 the level for
that channel is set at -
∞
dB. Register 0Eh (Mic Volume Register) has an extra bit that is for a 20dB
boost. When bit 6 is set to 1, the 20 dB boost is on. The default value is 8008, which corresponds to 0
dB gain with mute on. The default value for the mono registers is 8008h, which corresponds to 0dB
gain with mute on. The default value for stereo registers is 8808h, which corresponds to 0 dB gain with
mute on.
Table 11
. Analog Mixer Input Gain Register
MUTE
Gx4…Gx0
FUNCTION
0
00000
+12 dB gain
0
01000
0 dB gain
0
11111
-34.5 dB gain
1
xxxxx
-
∞
dB gain
4.4.5
Record Select Control Register (Index 1Ah
)
Used to select the record source independently for right and left. The default value is 0000h, which
corresponds to Mic in.
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