STA310 datasheet(61/90 Pages) STMICROELECTRONICS

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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

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

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.

ALL

All channels are rounded according to the selected output precision, (24b -> 16b,

24 -> 18b.) and scaled (volume control) only.

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).

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.

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).

BYP

BYPASS, All channels are directly routed to PCM outputs.

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

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