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參數(shù)資料
| 型號： | 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)： | 47/52頁 |
| 文件大?。?/td> | 815K |
| 代理商： | CD6420 |
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CDB6420
DS205DB1
47
RSThd - Receive Suppression speech-detection
Threshold
5 dB:
3 dB:
default
make disengaging receive suppression easier
(sensitive to bursty far end noise)
make receive suppression harder to disengage
(less sensitive to far end noise).
6 dB:
NCC - Network (echo canceller) Coefficient
Control
Normal:
Clear:
Freeze:
coefficients adapt to echo path
coefficients held to zero (no cancellation)
coefficients held to current values and adapta-
tion halted
NErle - Network ERLE threshold
24 dB:
18 dB:
default
network echo canceller tends to go to full-du-
plex more easily (faster)
network echo canceller requires good perfor-
mance to go to full-duplex (slower)
30 dB:
NFNse - Network Full-duplex Noise threshold
zero:
use NErle as sole criterion to transition to full-
duplex.
echo path may not exist, so go to full-duplex
when noise level is below -42 dB (easy) and in-
ternal determination of path/no path is complete
echo path may not exist, so go to full-duplex
when noise level is below -54 dB (hard) and in-
ternal determination of path/no path is complete
-42 dB:
-54 dB:
TVol - Transmit Volume
30 dB, 27 dB, ... , -57 dB, -60 dB, mute:
digital volume control, positive numbers are
AGC’d.
RHDet - Receive Half-duplex Detect threshold
5 dB:
3 dB:
default
half-duplex detects far end speech more easily
(more sensitive to far end noise)
half-duplex less sensitive to far end speech (less
sensitive to far end noise)
6 dB:
HHold - Half-duplex Hold on howl
checked:
unchecked:
after howl, CS6420 remains in half-duplex
after howl, CS6420 readapts
HDly - Half-duplex holdover Delay
200 ms:
100 ms:
150 ms:
default
very easy to break in, but may falsely switch
somewhat easy to break in, but may falsely
switch
HD - Half-duplex Disable
checked:
unchecked:
CS6420 will never be in half-duplex.
CS6420 can be in half-duplex as needed.
NseRmp - Noise estimator Ramp rate
1 sec:
noise estimator increases noise level by
3 dB/ 1 sec
estimated noise level increases by 3 dB/ 0.5 sec
(improves tracking of dynamic noise levels)
estimated noise level increases by 3 dB/ 2 sec
(improves detection of long bursts of speech)
0.5 sec:
2 sec:
THDet - Transmit Half-duplex Detect
threshold
5 dB:
3 dB:
default
half-duplex tends to detect transmit speech
more easily (more sensitive to near end noise)
half-duplex is less sensitive to transmit speech
(less sensitive to near end noise)
6 dB:
RVol - Receive Volume
30 dB, 27 dB, ... , -57 dB, -60 dB, mute:
digital volume control where positive numbers
are AGC’d
ACC - Acoustic (echo canceller) Coefficient
Control
Normal:
Clear:
Freeze:
coefficients adapt to echo path
coefficients held to zero (no cancellation)
coefficients held to current values and adapta-
tion halted
AErle - Acoustic ERLE threshold
24 dB:
18 dB:
default
acoustic echo canceller tends to go to full-du-
plex more easily (faster)
acoustic echo canceller requires good perfor-
mance to go to full-duplex (slower)
30 dB:
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