STA304A STMicroelectronics, STA304A Datasheet - Page 14

• Manufacturer Part Number: STA304A
• Description: IC PROCESSOR AUD DGTL DDX 44TQFP
• Manufacturer: STMicroelectronics
• Series: DDX™r
• Type: Audio Processorr

Specifications of STA304A

• Mounting Type: Surface Mount
• Package / Case: 44-TQFP, 44-VQFP
• Case: QFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Applications: -
• Other names: 497-3944

STA304A
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.
(*) Note: C and LFE channels are available only with 6 channels AC97 input. In case of 4 channels I
9.2 Static EQ
Figure 9.
14/31
Input
RS
LS
LFE
C
R
L
available
(*)
(*)
Scale in
Factor
Scale
LFE
Scale
RS
Scale
LS
bi-quad0
Scale
R
Scale
C
bi-quad1
Scale
L
Phantom
bi-quad2
+
Sur Filter
Sur Filter
LR Filter
LR Filter
bi-quad3
SBW
Filter
2
(
S, only L, R, LS, RS are
IIS
C)
SBW
RS
LS
R
L
Output