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STA333BW 데이터시트(PDF) 17 Page - STMicroelectronics

부품명 STA333BW
상세설명  2.1-channel 40-watt high-efficiency digital audio system
PDF  68 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA333BW 데이터시트(HTML) 17 Page - STMicroelectronics

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STA333BW
Processing data paths
68
5
Processing data paths
Figure 7 and Figure 8 below show the data processing paths inside STA333BW. The whole
processing chain is composed of two consecutive sections. In the first one, dual-channel
processing is implemented and in the second section each channel is fed into the post
mixing block either to generate a third channel (typically used in 2.1 output configuration and
with crossover filters enabled) or to have the channels processed by the DRC block (2.0
output configuration with crossover filters used to define the cut-off frequency of the two
bands).
The first section, Figure 7, begins with a 2x oversampling FIR filter providing 2 * fS audio
processing. Then a selectable high-pass filter removes the DC level (enabled if HPB = 0).
The left and right channel processing paths can include up to 8 filters, depending on the
selected configuration (bits BQL, BQ5, BQ6, BQ7 and XO[3:0]). By default, four user
programmable, independent filters per channel are enabled, plus the preconfigured
de-emphasis, bass and treble controls (BQL = 0, BQ5 = 0, BQ6 = 0, BQ7 = 0).
If the coefficient sets for the two channels are linked (BQL = 1) it is possible to use the
de-emphasis, bass and treble filters in a user defined configuration (provided the relevant
BQx bits are set). In this case both channels use the same processing coefficients and can
have up to seven filters each. If BQL = 0 the BQx bits are ignored and the fifth, sixth and
seventh filters are configured as de-emphasis, bass and treble controls, respectively.
Figure 7. Left and right processing, section 1
Moreover, the common 8th filter can be available on both channels provided the predefined
crossover frequencies are not used, XO[3:0] = 0, and the DRC is not used.
In the second section, Figure 8, mixing and crossover filters are available. If DRC is not
enabled they are fully user-programmable and allow the generation of a third channel
(2.1 outputs). Alternatively, in mode DRC, these blocks are used to split the sub-band and
define the cut-off frequencies of the two bands. A prescaler and a final postscaler allow full
control over the signal dynamics before and after the filtering stages. A mixer function is also
available.
From
I2S input
interface
PreScale
Biquad
#1
Biquad
#2
Biquad
#3
Biquad
#4
If HPB=0
User Defined Filters
If DSPB=0 and C1EQBP=0
x2
FIR
over
L
Sampling
frequency=Fs
Sampling
frequency=2xFs
From
I2S input
interface
PreScale
Hi-Pass
Filter
Hi-Pass
Filter
Biquad
#1
Biquad
#2
Biquad
#3
Biquad
#4
De-Emph.
If DEMP=0
x2
FIR
over
sampling
L
Sampling
frequency=Fs
Sampling
frequency=2xFs
Bass
Treble
If C1TCB=0
BTC: Bass Boost/Cut
TTC: Treble Boost/Cut
PreScale
Hi-Pass
Filter
Biquad
#1
Biquad
#2
Biquad
#3
Biquad
#4
If HPB=0
User Defined Filters
If DSPB=0 and C2EQBP=0
x2
FIR
over
L
PreScale
Hi-Pass
Filter
Biquad
#1
Biquad
#2
Biquad
#3
Biquad
#4
De-Emph.
If DEMP=0
x2
FIR
over
sampling
R
Bass
Treble
If C2TCB=0
BTC: Bass Boost/Cut
TTC: Treble Boost/Cut
If BQ5=1
and BQL=1
Biquad
#5
If BQ6=1
and BQL=1
Biquad
#6
IF BQ7=1
and BQL=1
Biquad
#7
If BQ5=1
and BQL=1
Biquad
#5
If BQ6=1
and BQL=1
Biquad
#6
IF BQ7=1
and BQL=1
Biquad
#7
From
I2S input
interface
PreScale
Biquad
#1
Biquad
#2
Biquad
#3
Biquad
#4
If HPB=0
User Defined Filters
If DSPB=0 and C1EQBP=0
x2
FIR
over
L
Sampling
frequency=Fs
Sampling
frequency=2xFs
From
I2S input
interface
PreScale
Hi-Pass
Filter
Hi-Pass
Filter
Hi-Pass
Filter
Hi-Pass
Filter
Biquad
#1
Biquad
#2
Biquad
#3
Biquad
#4
De-Emph.
If DEMP=0
x2
FIR
over
sampling
L
Sampling
frequency=Fs
Sampling
frequency=2xFs
Bass
Treble
If C1TCB=0
BTC: Bass Boost/Cut
TTC: Treble Boost/Cut
PreScale
Hi-Pass
Filter
Biquad
#1
Biquad
#2
Biquad
#3
Biquad
#4
If HPB=0
User Defined Filters
If DSPB=0 and C2EQBP=0
x2
FIR
over
L
PreScale
Hi-Pass
Filter
Biquad
#1
Biquad
#2
Biquad
#3
Biquad
#4
De-Emph.
If DEMP=0
x2
FIR
over
sampling
R
Bass
Treble
If C2TCB=0
BTC: Bass Boost/Cut
TTC: Treble Boost/Cut
If BQ5=1
and BQL=1
Biquad
#5
If BQ6=1
and BQL=1
Biquad
#6
IF BQ7=1
and BQL=1
Biquad
#7
If BQ5=1
and BQL=1
Biquad
#5
If BQ6=1
and BQL=1
Biquad
#6
IF BQ7=1
and BQL=1
Biquad
#7



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