STA304 데이터 시트보기 (PDF) - STMicroelectronics

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STA304

DIGITAL AUDIO PROCESSOR WITH MULTICHANNEL DDX™

STMicroelectronics 

STA304

10.0 BASS MANAGEMENTAND EQ

The STA304 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.

10.1 Bass Redirection

Figure 8.

L

C (*)

R

LS

RS

Phantom

Scale

RS

Scale

LS

Scale

R

Scale

C

Scale

L

LR Filter

L

(IIS C)

LR Filter

R

Sur Filter

LS

Sur Filter

RS

(*)

LFE

Scale

LFE

+

SBW

Filter

SBW

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.

(*) Note: C and LFE channels are available only with 6 channels AC97 input. In case of 4 channels I2S, only L, R, LS, RS are

available

10.2 Static EQ

Figure 9.

Input

Scale in

Factor

bi-quad0

bi-quad1

bi-quad2

bi-quad3

Output

15/30

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