STA311B datasheet(49/102 Pages) STMICROELECTRONICS

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STA311B

Registers

102

AutoMode downmix setting uses channels 7-8 of Mix#1 engine and therefore these

channels of this function are fixed and not allowed to be set by the user when in this mode.

Channels 1-6 must be arranged via channel mapping (registers CnIM) if necessary in the

following manner for this operation:

Channel 1: left

Channel 2: right

Channel 3: left surround

Channel 4: right surround

Channel 5: center

Channel 6: LFE

8.2.33

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 by the end user.

The AutoMode bass management settings utilize channels 1-6 on the mix #1 engine,

channels 1-6 biquad #6, and channels 1-2 on 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.

Bit

RST

Name

Description

7RW

AMDM

AutoMode 5.1 downmix:

0: normal operation

1: channels 7-8 are 2-channel downmix of channels

1-6

SUB

RSS1

RSS0

CSS1

CSS0

FSS

AMBMXE

AMBMME

000

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

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