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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(yè)數(shù)： | 14/52頁(yè) |
| 文件大?。?/td> | 815K |
| 代理商： | CD6420 |
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CS6420
14
DS205PP2
Register 1
*
Denotes reset value
Table 4. Register 1 Bit Definitions
HD - Half-Duplex Disable
In normal operation, the CS6420 will be in a half-
duplex mode if the echo canceller is not providing
enough loop gain reduction to prevent howling.
This half-duplex mode would be active at power-
up, for example, before the adaptive filter has had a
chance to adapt. This half-duplex mode prevents
howling and also masks the convergence process.
In some cases, such as when measuring conver-
gence speed (see
Testing Issues
), the half-duplex
mode is undesirable. By default, the half-duplex
mode is enabled.
RSD - Receive Suppression Disable
The Receive Supplementary Echo Suppression
function is a non-linear echo control mechanism.
Supplementary Echo Suppression attenuates sig-
nals in the receive direction by 24 dB when far-end
speech is absent in the receive path. The attenua-
tion is released only when the receive channel is ac-
tive. It is also designed to not be triggered by
b15
HD
0
b14
RSD
0
b13
b12
b11
b10
b9
b8
b7
TVol
01010
b6
b5
b4
b3
b2
0
0
b1
1
1
b0
0
0
Taps
10
NCC
00
RGain
00
Bits
Name
Function
Word
0*
1
0*
1
00
01
10*
11
00*
01
10
11
00000
00001
---
00100
---
01010*
01011
---
11101
11110
11111
00*
01
10
11
Operation
enable half-duplex
disable half-duplex
enable Rx suppression
disable Rx suppression
444/0 (55.5ms/disabled)
380/128 (47.5ms/16ms)
316/192 (39.5ms/24ms)
252/256 (31.5ms/32ms)
Normal
Clear
Freeze
reserved
+30 dB
+27 dB
15
HD
Half-Duplex Disable
14
RSD
Rx Suppression Disable
13-12
Taps
AEC/NEC Tap Allocation
11-10
NCC
NEC Coefficient Control
9-5
TVol
Tx Volume Control
+18 dB
+0 dB
-3 dB
-57 dB
-60 dB
mute
0 dB
6 dB
9.5 dB
12 dB
4-3
RGain
Rx Analog Gain
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