STA309B datasheet(39/66 Pages) STMICROELECTRONICS

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STA309B

Registers

Doc ID 022570 Rev 2

39/66

7.2.33

AUTO2 - AutoModes bass management2 (0x20)

Setting the AMBMME bit enables the proper mixing to take place for various preset bass

management configurations. Setting the AMBMXE bit enables the proper crossover filtering

in biquad #7 to take place. The crossover for bass management is always 2nd order

(24 dB/oct) and the crossover frequency is determined by register bits PREEQ.XO[2:0].

All configurations of Dolby Bass Management can be performed in the IC. These different

configurations are selected as they would be by the end-user.

The AutoMode bass management settings utilize channels 1-6 in the Mix #1 engine,

Channels 1-6 biquad #6, and channels 1-2 in the mix #2 engine in configuration #2. These

functions cannot be user-programmed while the bass management automode is active.

Not all settings are valid as some configurations are unlikely and do not have to be

supported by Dolby specifications.

Automatic crossover settings are provided or custom crossovers can be implemented using

the available programmable biquads.

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

SUB

RSS1

RSS0

CSS1

CSS0

FSS

AMBMXE

AMBMME

Bit

RST

Name

Description

AMBMME

0: AutoMode bass management mix disabled

1: AutoMode bass management mix enabled

Bit

RST

Name

Description

AMBMXE

0: AutoMode bass management crossover disabled

1: AutoMode bass management crossover enabled

Bitfield

CSS - center speaker size

Off

Large

Small

RSS - rear speaker size

Off

Large

Small

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