CDB6403 データシートの表示（PDF） - Cirrus Logic

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CDB6403

Echo-Cancelling Codec

Cirrus Logic 

CS6403

Register SSI_CR0 (cont.)

BIT

GBC1

GBC0-

NAME

Graded-Beta Count

VALUE

FUNCTION

Graded-Beta Count - These bits control the rate at

which the update gain decays in the AEC as the

adaptive-filter taps are updated in a particular

sample time. For each setting below, some

number of taps are processed, after which the

update gain is divided by two. The possible

settings are given below:

Taps Processed

Equivalent path-decay rate

AECB1

AECB0

AEC Beta

00

512

01

64

10 R

128

11

256

0 dB/ms

0.75 dB/ms

0.38 dB/ms

0.19 dB/ms

These bits scale the adaptive filter update gain that

is present at the start of each sample time.

Update Gain

00

0.25

01

0.5

10 R

1.0

11

2.0

"R" indicates value after Reset

Recommended settings for D3-D0:

0001

0111

1010

1100

--No graded beta

--"dead" room/car;

0.75 dB/ms path decay

--medium room; (default)

0.28 dB/ms path decay

--large (or "live") room;

0.19 dB/ms decay

20

DS192PP6

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