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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)： | 17/52頁 |
| 文件大小： | 815K |
| 代理商： | CD6420 |
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CS6420
DS205PP2
17
RHDet - Receive Half-Duplex Detection
Threshold
The sensitivity of the speech detector controls
channel switching and ownership in half-duplex
mode. The receive speech detector registers speech
if the receive channel signal power is RHDet above
the noise floor for the receive channel.
HDly - Half-Duplex Holdover Delay
After a channel goes idle in the half-duplex mode
of operation, a change of channel ownership is in-
hibited for HDly in order to prevent false switching
due to echoes. The half-duplex will be more im-
mune to false switching if this delay is longer, but
it will also prevent a fast response to legitimate
channel changes.
NseRmp - Background Noise Power Estimator
Ramp Rate
The background noise power estimators increase at
a rate of 3 dB/NseRmp until the background noise
power estimate equals the current input power esti-
mate. The background noise power estimators
quickly track drops in the current input power esti-
mate. Choose small values of NseRmp if the envi-
ronment is expected to have rapidly varying noise
levels. Choose large values of NseRmp if the envi-
ronment is expected to have relatively constant
noise power.
RSThd - Receive Suppression Threshold
This parameter sets the threshold for far-end
speech detection for disengaging receive suppres-
sion. The speech detector that disengages the re-
ceive suppression has its sensitivity controlled by
RSThd. The suppression is inserted into the receive
path unless signal from the far-end exceeds the re-
ceive channel noise power by RSThd, in which
case speech is assumed to be detected and the sup-
pression is defeated until speech is no longer de-
tected. Decreasing RSThd to make the speech
detector more sensitive could result in false detec-
tions due to spurious noise events which may cause
an unpleasant noise modulation at the near-end. In-
creasing RSThd to make it robust to spurious noise,
but may cause weak far-end talkers to not be heard.
RSThd does not affect the ability of the receive
suppressor to attenuate residual network echo.
PCSen- Path Change Sensitivity
The Acoustic Interface is likely to have many path
changes, for example, as people move about in the
room where the full-duplex speakerphone is being
used. The sensitivity of the path change detector
can be changed with the PCSen Bit. Set PCSen to 0
for high sensitivity and 1 for low sensitivity.
If PCSen is set to high, extended doubletalk may
cause the CS6420 to briefly drop into half-duplex.
When PCSen is set to low, brief echo may be heard
during path changes.
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