STA309A View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
STA309A Datasheet PDF : 67 Pages
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STA309A
Registers
7.2.34
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
Table 58. CSS and RSS bits
Bitfield
CSS - center speaker size
RSS - rear speaker size
10
Off
Off
01
Large
Large
00
Small
Small
Table 59. FSS and SUB bits
Bitfield
1
0
FSS - front speaker size
SUB - subwoofer
Large
On
Small
Off
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.
AUTO3 - Automodeâ„¢ AM/prescale/bass management scale (0x21)
D7
AMAM2
0
D6
AMAM1
0
D5
AMAM0
0
Table 60. AMPS bit
Bit RW RST
Name
0 RW 0
AMPS
Table 61. MSA bit
Bit RW RST
Name
1 RW 0
MSA
D4
AMAME
0
D3
D2
Reserved
0
0
D1
MSA
0
D0
AMPS
1
Description
Automode prescale
0: -18 dB used for prescale when AMEQ is not 00
1: user defined prescale when AMEQ is not 00
Description
Bass management mix scale adjustment
0: -12 dB scaling on satellite channels in Config #1
1: no scaling on satellite channels in Config #1
Doc ID 13855 Rev 4
41/67
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