STA310 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STA310' PDF : 90 Pages View PDF
STA310
Type: RW
Software Reset: NC
Hardware Reset: UND
Description:
6 output configurations are provided that redirects
bass on subwoofer channel, and applies some filters
on channels.
The description is provided in the output configura-
tion section.
This register is used to indicate the output configura-
tion chosen.
- LP means Low pass filter
- HP means High pass filter
Bitfield conf Meaning
Description
OCFG[2:0]
Bass management configuration according to the bass direction scheme from
Dolby. For configurations 2,3,4 the subwoofer can be output is bit LFE asset to
high. For all other configurations, the LFE bit has no effect.
0
ALL All channels are rounded according to the selected output precision, (24b -> 16b,
24 -> 18b.) and scaled (volume control) only.
1
LSW Low frequencies are extracted from the six input channels and redirected to the
subwoofer. SUB = LP(L+R+Ls+Rs+C+LFE).Low frequencies are removed from all
channels L = HP(L), R = HP(R), C = HP(C), Ls = HP(Ls), Rs = HP(Rs).
2
LLR Low frequencies are extracted from C, LFE, Ls and Rs channels and redirected to
left and right channels: C = HP (C), Rs = HP (Rs), Ls = HP(Ls), L = L + LP
(C+LFE+Ls+Rs), R = R + LP(C+LFE+Ls+Rs). If subwoofer is output, SUB = LP
(LFE+C+Ls+Rs).
3(1)
SLP Low frequencies are redirected to the left, right and surround channels or cab be
output on the subwoofer.
If sub-woofer is output, SUB = LFE, L = L + LP(C), R = R + LP(C), Ls = Ls, Rs = Rs
If sub-woofer is not output, L = L + LP(C) + LFE, R = R + LP(C) + LFE, Ls = Ls +
LFE, Rs = Rs + LFE.
4
SIMP Simplified configuration. Low frequencies are exrtacted from C, Ls, Rs and LFE.
If subwoofer is output, SUB = LP(C+Ls+Rs) + LFE, L = L, R = R.
If sub-woofer is not output, SUB = LFE, L = L + (C+Ls+Rs), R = R + (C+Ls+Rs).
5
BYP BYPASS, All channels are directly routed to PCM outputs.
6
configuration 1 without filters.
BOOST(1)
Channel level, enables boost:
if OCFG_num = 2 :
0 : No +12dB boost on left and right channels
1 : +12dB boost on left and right channels
When configuration = 3 :
If sub-woofer is output :
0 : No +4dB boost on all channels
1 : +4dB boost on all channels
If sub-woofer is not output :
0 : No +8dB boost on all channels
1 : +8dB boost on all channels
LFE_BYOP 0; LFE channel is clear
1: LFE channel is bypassed
Note:
1. In configuration 3 with subwoofer enabled, the output of
the subwoofer is 10dB greater than expected. Therefore
when using this mode, the subwoofer output level needs
to be attenuated 10dB in order to match the subwoofer
output levels of other bass management configurations.
In general be carefull while using the boost option since
it has the potential of causing the woofer output to over-
load
DWSMODE
61/90
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