STA309B View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STA309B' PDF : 66 Pages View PDF
STA309B
Registers
7.2.33 AUTO2 - AutoModes bass management2 (0x20)
D7
SUB
1
D6
RSS1
0
D5
RSS0
0
D4
CSS1
0
D3
CSS0
0
D2
FSS
0
D1
D0
AMBMXE AMBMME
0
0
Bit RW RST
Name
0
RW
0
AMBMME
Description
0: AutoMode bass management mix disabled
1: AutoMode bass management mix enabled
Bit RW RST
Name
Description
1
RW
0
AMBMXE
0: AutoMode bass management crossover disabled
1: AutoMode bass management crossover enabled
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
Bitfield
CSS - center speaker size
RSS - rear speaker size
10
Off
Off
01
Large
Large
00
Small
Small
Doc ID 022570 Rev 2
39/66
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