STA309A datasheet(41/67 Pages) STMICROELECTRONICS

41 / 67 page

STA309A

Registers

Doc ID 13855 Rev 4

41/67

Input channels must be mapped using the channel-mapping feature in the following manner

for bass management to be performed properly.

1: left front

2: right front

3: left rear

4: right rear

5: center

6: LFE

When AMBMXE = 1, biquad #7 on channels 1-6 are utilized for bass-management

crossover filter, this biquad is not user programmable in this mode. The XO settings

determine the crossover frequency used, the crossover is 2nd order for both high-pass and

low-pass with a -3 dB cross point. Higher order filters can be obtained be programming

coefficients in other biquads if desired.

It is recommended to use settings of 120-160 Hz when using small, single driver satellite

speakers as the frequency response of these speakers normally are limited to this region.

7.2.34

AUTO3 - Automode™ AM/prescale/bass management scale (0x21)

Table 58.

CSS and RSS bits

Bitfield

CSS - center speaker size

Off

Large

Small

RSS - rear speaker size

Off

Large

Small

Table 59.

FSS and SUB bits

Bitfield

FSS - front speaker size

Large

Small

SUB - subwoofer

Off

AMAM2

AMAM1

AMAM0

AMAME

Reserved

MSA

AMPS

000

Table 60.

AMPS bit

Bit

RST

Name

Description

0RW

AMPS

Automode prescale

0: -18 dB used for prescale when AMEQ is not 00

1: user defined prescale when AMEQ is not 00

Table 61.

MSA bit

Bit

RST

Name

Description

1RW

MSA

Bass management mix scale adjustment

0: -12 dB scaling on satellite channels in Config #1

1: no scaling on satellite channels in Config #1

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