W681307 Datasheet, PDF (100/160 Pages) Winbond – USB1.1 CODEC Microprocessor Control Unit with 32KB Mask ROM and 4KB RAM

W681307
13.4.6
13.4.6.1
Noise Suppressor Registers
NS_STTACK_Tcand_GAIN
Address
0x14E7
Access Mode
R/W
Value At Reset Nominal Value
0x00
0xB5
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
ShortTermNSPowerATTACKTC[7:4]
Noise_Suppressor_Index[3:0]
： Noise_Suppressor_Index This 4-bit field defines the gain of Noise suppressor
Noise_Suppressor_Index[3:0]
Noise Suppressor Level (dB)
Noise_Suppressor_Index[3:0]
Noise Suppressor Level (dB)
0
-1
9
-10
1
-2
A
-11
2
-3
B
-12
3
-4
C
-13
4
-5
D
-14
5
-6
E
-15
6
-7
F
-16
7
-8
： ⁸
ShortTermNSPowerATTACKTC
-9
The 4-bit field defines the "Time Constant" to calculate the power of voice that enters the noise suppressor module.
So "Noise Suppressor" can determine if current power of voice is larger than "Noise threshold" or not.
The operation is just like "Short term acoustic power time constant.
13.4.6.2
NS_ATTEN_DW_UP_TC
Address
0x14E8
Access Mode Value At Reset Nominal Value
R/W
0x00
0x55
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Noise_fall_TC[4:7]
Noise_rise_TC[0:3]
Noise_rise_TC
Noise_fall_TC
This 4-bit field defines the time constant of Noise suppressor gain from the gain specified by
"noise_suppressor_index" to "0dB". Larger value, faster speed.
This 4-bit field defines the time constant of Noise suppressor gain from "0dB" to the gain specified by
"noise_suppressor_index". Larger value, faster speed.
13.4.6.3
Address
0x14E9
NS_Active_Power_MSB
Access Mode Value At Reset Nominal Value
R/W
0x00
0x00
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
NS_Active_Power_MSB
The most significant byte of noise threshold.
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Publication Release Date: May, 2007
Revision 1.3