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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)： | 13/52頁 |
| 文件大?。?/td> | 815K |
| 代理商： | CD6420 |
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CS6420
DS205PP2
13
CS6420, is controlled by GB. The network echo
canceller does not support graded beta.
Graded beta is an architectural enhancement to the
CS6420 which takes advantage of the fact that
acoustic echoes tend to decay exponentially with
time. The CS6420 can increase the beta, or update
gain, for the coefficients of the adaptive filter
which occur earlier in time and decrease it for those
that occur later in time, which increases conver-
gence speed while maintaining stability. In order to
make this improvement, there is an implicit assump-
tion that the decay rate of the echo is known. The
graded beta control allows the system designer to ad-
just this. For very acoustically live rooms, use either
no decay (00) or slight decay (11). Cars and acousti-
cally dead rooms can benefit from the most rapid de-
cay (01).
ACC - Acoustic Coefficient Control
The coefficients of the AEC adaptive filters in the
CS6420 are controlled by ACC. The default posi-
tion (00) yields normal operation, which means the
coefficients are free to adjust themselves to the
echo path in order to cancel echo. When set to the
clear position (01), the adaptive filter coefficients
are all held at zero, so the echo canceller is effec-
tively disabled. Note that unless the half-duplex
mode is disabled, this will force the CS6420 into
half-duplex mode. The freeze position (10) causes
the coefficients to hold their current values.
RVol - Receive Volume Control
Volume in the receive path is set by RVol. The vol-
ume control in the receive direction is implemented
by a peak-limiting automatic gain control (AGC)
and digital attenuation at the near-end output DAC.
The AGC is discussed in detail in the
Design Con-
siderations
section. See the sub-section on
AGC
for a full explanation of how it functions.
When the reference level is set to +0 dB, the AGC
is effectively disabled. Volume control is imple-
mented by digital attenuation in 3 dB steps from
this point on down. The maximum gain is +30 dB
and the minimum is -60 dB in 3 dB steps. The low-
est gain setting (11111) mutes the receive path.
The default setting for the receive reference level is
+18 dB.
TGain - Transmit Analog Gain
TGain selects the amount of additional on-chip an-
alog gain to be supplied to the acoustic input of the
CS6420. A programmable gain amplifier (PGA)
exists before each ADC which allows 0 dB, 6 dB,
9.5 dB, or 12 dB of gain to be added to the signal
path. The acoustic side defaults to 0 dB of gain.
Note: Changing the analog gain will change the full-
scale voltage as applied to the input pin. Make
sure that the ADC input does not clip with the gain
stage on.
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