STA304A

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9.0 BASS MANAGEMENTAND EQ

The STA304A has the ability to redirect the sound to the SBW channel and to pass each channel through a 4-

stage cascaded 2nd order IIR filter. With the combination of the DDX gain/compressor (CRA register bits 2-3)

a dynamic EQ can be implemented. Beside that, a special Side-Firing sound can be achieved by enabling this

feature available with the ready made filter topology on the surround channels.

9.1 Bass Redirection

Figure 8.

There is an option to redirect each input channel to the SBW output channel. The Scale factor of each channel

should be set with values in the range of 0 (no redirection) to -1 (full redirection). About setting the scaling factors

registers, see paragraph 10.

The redirection is taking place when the bit 0 of the Bass Management Register (add.72h) is set (see section

12.13).

Together with the static EQ option (following section), by setting appropriate filters, a full bass management so-

lution is available.

available

9.2 Static EQ

Figure 9.

Phantom

LR Filter

LR Filter

Sur Filter

Sur Filter

+

Scale

L

Scale

C

Scale

R

Scale

LS

Scale

RS

Scale

LFE

SBW

Filter

L

C

R

LS

RS

LFE

L

R

LS

RS

SBW

(*)

(*)

Scale in

Factor

bi-quad0

bi-quad1

bi-quad2

bi-quad3

Input

Output