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CS6403 Datasheet(PDF) 9 Page - Cirrus Logic

No. de pieza CS6403
Descripción Electrónicos  Echo-Cancelling Codec
Download  54 Pages
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Fabricante Electrónico  CIRRUS [Cirrus Logic]
Página de inicio  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS6403 Datasheet(HTML) 9 Page - Cirrus Logic

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OVERVIEW
In hands-free speakerphones, the signal from the
far end may echo about the near-end environ-
ment and then be received at the near-end
microphone.
When heard at the far end, this
echo signal can be very annoying, particularly if
the signal is delayed by transmission or signal-
processing delays.
Voice switching is a particularly simple tech-
nique for eliminating this echo, but since it
imposes half-duplex communication, it seriously
compromises conversation quality.
Echo cancellation can provide high-quality, full-
duplex communication, but typically must be
implemented using expensive digital signal-proc-
essing hardware.
Echo Cancellation in the CS6403
The CS6403 provides high-quality echo cancel-
lation at low cost.
This breakthrough in
cost/performance is made possible on the
CS6403 by custom, application-optimized proc-
essing blocks, which are integrated on a single
die, as shown in Figure 2.
One of these processing blocks is the AFP
(Adaptive Filter Processor).
This block imple-
me nts a 5 1 2 -ta p A F IR ( Ad aptive Finite
Impulse-Response) filter which is updated using
an enhanced least-mean squared (LMS) algo-
rithm. At a sampling rate of 8 kHz, it can cancel
up to 64 ms of echo. By default, 10 ms of the
available 64 ms are allocated to a network can-
celler (NEC), and the remaining 54 ms are
allocated to an acoustic echo canceller (AEC).
RESET
CLKIN CLKOUT
DVDD0
PLL/Oscillator
SSI
CPU
AFP
CODEC
SCLK
SFRAME
SMASTER
SDO
SDI
RESERVED0
DGND0
RESERVED1
GPIN3
CONFIG
GPIN0
GPIN1
GPIN2
SCLK_RATE0 SCLK_RATE1
DVDD1
DGND1
PVDD
PGND0
PGND1
AVDD
SPKROUTP
SPKROUTN
VREF
VCM
MICIN
AGND0
AGND1
GPOUT0
GPOUT1
RESERVED2
RESERVED3
RESERVED4
SSYNC
SYNCOUT
UALAW
NC
RESERVED5
RESERVED6
CLK_SEL
Figure 2. CS6403 Internal Block Diagram
CS6403
DS192PP6
9


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