CS6420-CS datasheet(18/52 Pages) CIRRUS

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CS6420

DS205PP2

* Denotes reset value

Table 6. Register 3 Bit Definitions

AErle - Acoustic ERLE Threshold

The CS6420 will allow full-duplex operation only

when the Acoustic ERLE it provides exceeds AEr-

le. See also AFNse. See Glossary for a definition

of ERLE.

AFNse - Acoustic Full-Duplex Noise Threshold

AFNse works in conjunction with AErle to deter-

mine when the CS6420 should transition into full-

duplex operation. If the current noise level at the

near-end input is greater than AFNse, then AErle is

used to determine if full-duplex is allowed. If the

noise level is below the level of AFNse, the

CS6420 uses an internal estimate of asymptotic

performance to determine whether or not to transi-

tion to full-duplex. If AFNse is zero, AErle is al-

ways used as the full-duplex criterion. The other

values exist for cases where there may not be an

acoustic path to converge to.

THDet - Transmit Half-Duplex Detection

b15

b14

b13

b12

b11

b10

AErle

AFNse

THDet

TSAtt

TSBias

TSThd

HHold

Bits

Name

Function

Word

Operation

15-14

AErle

AEC ERLE Threshold

00*

24 dB

18 dB

30 dB

reserved

13-12

AFNse

AEC Full-Duplex Noise Threshold

00*

zero

-42 dB

-54 dB

reserved

11-10

THDet

Tx Half-Duplex Detection Threshold

00*

5 dB

3 dB

6 dB

reserved

9-8

TSAtt

Tx Suppression Attenuation

00*

18 dB

12 dB

24 dB

reserved

7-6

TSBias

Tx Suppression Bias

00*

18 dB

15 dB

21 dB

reserved

5-4

TSThd

Tx Suppression Threshold

00*

15 dB

12 dB

9 dB

reserved

HHold

Hold in Half-Duplex on Howl

disable

enable

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