CDB6403 データシートの表示（PDF） - Cirrus Logic
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CDB6403 Datasheet PDF : 54 Pages
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CS6403
> 1/8"
GDPrilogauintnaedl CoGnrnFoBee+uecr5nratVdiidtoen CXST6A4L03GA-PIrnQloaaunlonegd 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Note that the CS6403 is
oriented with its digital pins
(pins 1-17 and 29-44)
towards the digital end of
the board.
Digital Logic
Codec
Digital
Signals
Codec
Analog
Signals &
Components
Figure 10. Suggested Layout Guideline
These processing blocks are described in the fol-
lowing sections.
Echo Cancellers
Echo cancellers provide two benefits to full-du-
plex communication systems: loop-gain
reduction and echo reduction. Loop-gain reduc-
tion can prevent acoustic instability and acoustic
howling in systems where closed acoustic paths
are present. Echo reduction can prevent a talker
from hearing his own voice reflected back. Such
reflections are particularly annoying in systems
where there is a large transport or coding delay
in the communications paths. An echo canceller
provides echo reduction by estimating the im-
pulse response of the reflecting path, and then
substracting out the echo.
The echo cancellers in the CS6403 are designed
to best cancel echo produced in linear, time-in-
variant paths. Nonlinearities and time variance
in the paths can limit echo return-loss enhance-
ment (ERLE) performance.
A CS6403 provides two echo cancellers: an
acoustic echo canceller, and a network canceller
(see Figure 3). The network canceller removes
reflections due to impedance mismatches in the
network. The acoustic canceller removes near
end speaker signals that are coupled into the
near-end microphone. In systems where there is
no network echo (e.g., in some ISDN applica-
tions), the network canceller can be disabled,
causing all 64 ms of echo cancellation available
on the CS6403 to be allocated to acoustic echo
cancellation. This is done by setting NECD:
SSI_CR0.8 = 1.
The echo cancellers on the CS6403 train con-
tinuously using the speech signals (i.e, no special
training signals are generated by the CS6403 at
any time) from the far end (for the acoustic can-
celler) and from the near end (for the network
canceller). The echo cancellers’ convergence
performance has been optimized for speech; as a
result, testing the echo-canceller performance
with white noise will not give a useful indication
of expected performance.
24
DS192PP6
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