CS6420-CS datasheet(12/52 Pages) CIRRUS

12 / 52 page

CS6420

DS205PP2

* Denotes reset value

Table 3. Register 0 Bit Definitions

Mic - Microphone Preamplifier Enable

The microphone preamplifier described in the

Acoustic Interface section is enabled by default, but

may be disabled by setting Mic to 0. Refer to the

Acoustic Interface section for more details on us-

ing/disabling the Microphone Preamplifier.

TSD - Transmit Suppression Disable

The Transmit Supplementary Echo Suppression

function is a non-linear echo control mechanism.

The Transmit Suppression will introduce TSAtt

(see Register 3) dB of attenuation into the transmit

path only when there is speech detected in the re-

ceive path and no near-end speech. When only

near-end speech is present, or if there is no speech

in either direction, the suppression attenuation is

removed. By default, the transmit suppression

function is enabled.

GB - Graded Beta

The room-size adjustment scheme called “graded

beta,” provided for the acoustic echo canceller in the

b15

b14

b13

b12

b11

b10

Mic

TSD

ACC

RVol

TGain

00100

Bits

Name

Function

Word

Operation

Mic

Microphone Preamplifier Enable

disable preamp

enable preamp

TSD

Tx Suppression Disable

enable Tx suppression

disable Tx suppression

13-12

Graded Beta

10*

0.00 dB/ms

0.75 dB/ms

0.38 dB/ms

0.19 dB/ms

11-10

ACC

AEC Coefficient Control

00*

Normal

Clear

Freeze

reserved

9-5

RVol

Rx Volume Control

00000

00001

---

00100*

---

01010

01011

---

11101

11110

11111

+30 dB

+27 dB

+18 dB

+0 dB

-3 dB

-57 dB

-60 dB

mute

4-3

TGain

Tx Analog Gain

00*

0 dB

6 dB

9.5 dB

12 dB

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