參數(shù)資料
型號(hào): CD6420
廠商: Cirrus Logic, Inc.
英文描述: FULL DUPLEX SPEAKERPHONE CHIP
中文描述: 的全雙工免提通話芯片
文件頁數(shù): 18/52頁
文件大?。?/td> 815K
代理商: CD6420
CS6420
18
DS205PP2
Register 3
*
Denotes reset value
Table 6. Register 3 Bit Definitions
AErle - Acoustic ERLE Threshold
The CS6420 will allow full-duplex operation only
when the Acoustic ERLE it provides exceeds AEr-
le. See also AFNse. See
Glossary
for a definition
of ERLE.
AFNse - Acoustic Full-Duplex Noise Threshold
AFNse works in conjunction with AErle to deter-
mine when the CS6420 should transition into full-
duplex operation. If the current noise level at the
near-end input is greater than AFNse, then AErle is
used to determine if full-duplex is allowed. If the
noise level is below the level of AFNse, the
CS6420 uses an internal estimate of asymptotic
performance to determine whether or not to transi-
tion to full-duplex. If AFNse is zero, AErle is al-
ways used as the full-duplex criterion. The other
values exist for cases where there may not be an
acoustic path to converge to.
THDet - Transmit Half-Duplex Detection
b15
b14
b13
AFNse
00
b12
b11
b10
b9
b8
b7
TSBias
00
b6
b5
b4
b3
b2
1
1
b1
1
1
b0
0
0
AErle
00
THDet
00
TSAtt
00
TSThd
00
HHold
0
Bits
Name
Function
Word
00*
01
10
11
00*
01
10
11
00*
01
10
11
00*
01
10
11
00*
01
10
11
00*
01
10
11
0*
1
Operation
24 dB
18 dB
30 dB
reserved
zero
-42 dB
-54 dB
reserved
5 dB
3 dB
6 dB
reserved
18 dB
12 dB
24 dB
reserved
18 dB
15 dB
21 dB
reserved
15 dB
12 dB
9 dB
reserved
disable
enable
15-14
AErle
AEC ERLE Threshold
13-12
AFNse
AEC Full-Duplex Noise Threshold
11-10
THDet
Tx Half-Duplex Detection Threshold
9-8
TSAtt
Tx Suppression Attenuation
7-6
TSBias
Tx Suppression Bias
5-4
TSThd
Tx Suppression Threshold
3
HHold
Hold in Half-Duplex on Howl
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